CoderzHeaven

Hello friends…

This tutorial is about how to use interfaces in java or Android.

So what is an Interface?

An interface is a collection of abstract methods. A class implements an interface, thereby inheriting the abstract methods of the interface.

An interface is not a class. Writing an interface is similar to writing a class, but they are two different concepts. A class describes the attributes and behaviors of an object. An interface contains behaviors that a class implements.

Unless the class that implements the interface is abstract, all the methods of the interface need to be defined in the class.

An interface is similar to a class in the following ways:

• An interface can contain any number of methods.

• An interface is written in a file with a .java extension, with the name of the interface matching the name of the file.

• The bytecode of an interface appears in a .class file.

• Interfaces appear in packages, and their corresponding bytecode file must be in a directory structure that matches the package name.

However, an interface is different from a class in several ways, including:

• You cannot instantiate an interface.

• An interface does not contain any constructors.

• All of the methods in an interface are abstract.

• An interface cannot contain instance fields. The only fields that can appear in an interface must be declared both static and final.

• An interface is not extended by a class; it is implemented by a class.

• An interface can extend multiple interfaces.

———————————————–

Here I will show you how to do it in Android or Java.
This example is for Android.

So can we start.

This is the interface that I am going to implement.

MyTestInterface.java

package com.coderzheaven.interfacetest1;

public interface MyTestInterface {

	void testFunctionOne();

	void testFunctionTwo();

}

Now we will write the activity that implements the above interface.

package com.coderzheaven.interfacetest1;

import android.app.Activity;
import android.os.Bundle;

public class MainActivity extends Activity implements MyTestInterface {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
	}

	@Override
	public void testFunctionOne() {
		System.out.println("Print from testFunctionOne in the Interface");
	}

	@Override
	public void testFunctionTwo() {
		System.out.println("Print from testFunctionTwo in the Interface");
	}
}

Ok Done. Go on and Run it.

Here is a simple example showing how to load a database values in a spinner in android.

OK we will start.

This is the layout for the spinner row.
spinner_row.xml

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation     =      "vertical"
    android:id="@+id/tv"
    android:layout_margin="10dp">   
</TextView>

This is the layout for the interface.

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:textStyle="bold"
        android:text="Load DB values into Spinner"
         >
    </TextView>

    <Spinner
        android:id="@+id/spinner1"
        android:layout_below="@+id/tv"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true" />

</LinearLayout>

Now this is the MainActivity.java file that uses the spinner and the database.

package com.coderzheaven.loadspinnerfromdb;

import   java  .util  .ArrayList;

import android.app.Activity;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Toast;

public class MainActivity extends Activity {

	SQLiteDatabase mydb;
	private   static String DBNAME = "PERSONS.db";
	private static String TABLE = "MY_TABLE";

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		createTable();
		insertIntoTable();

		ArrayList<String> my_array = new ArrayList<String>();
		my_array = getTableValues();

		Spinner My_spinner = (Spinner) findViewById(R.id.spinner1);
		ArrayAdapter my_Adapter = new ArrayAdapter(this, R.layout.spinner_row,
				my_array);
		My_spinner.setAdapter(my_Adapter);
	}

	// CREATE TABLE IF NOT EXISTS
	public void createTable() {
		try {
			mydb = openOrCreateDatabase(DBNAME, Context.MODE_PRIVATE, null);
			mydb.execSQL("CREATE TABLE IF  NOT EXISTS " + TABLE
					+ " (ID INTEGER PRIMARY KEY, NAME TEXT, PLACE TEXT);");
			mydb.close();
		} catch (Exception e) {
			Toast.makeText(getApplicationContext(), "Error in creating table",
					Toast.LENGTH_LONG);
		}
	}

	// THIS FUNCTION INSERTS DATA TO THE DATABASE
	public void insertIntoTable() {
		try {
			mydb = openOrCreateDatabase(DBNAME, Context.MODE_PRIVATE, null);
			mydb.execSQL("INSERT INTO " + TABLE
					+ "(NAME, PLACE) VALUES('CODERZHEAVEN','GREAT INDIA')");
			mydb.execSQL("INSERT INTO " + TABLE
					+ "(NAME, PLACE) VALUES('ANTHONY','USA')");
			mydb.execSQL("INSERT INTO " + TABLE
					+ "(NAME, PLACE) VALUES('SHUING','JAPAN')");
			mydb.execSQL("INSERT INTO " + TABLE
					+ "(NAME, PLACE) VALUES('JAMES','INDIA')");
			mydb.execSQL("INSERT INTO " + TABLE
					+ "(NAME, PLACE) VALUES('SOORYA','INDIA')");
			mydb.execSQL("INSERT INTO " + TABLE
					+ "(NAME, PLACE) VALUES('MALIK','INDIA')");
			mydb.close();
		} catch (Exception e) {
			Toast.makeText(getApplicationContext(),
					"Error in inserting into table", Toast.LENGTH_LONG);
		}
	}

	// THIS FUNCTION SHOWS DATA FROM THE DATABASE
	public ArrayList<String> getTableValues() {

		ArrayList<String> my_array = new ArrayList<String>();
		try {
			mydb = openOrCreateDatabase(DBNAME, Context.MODE_PRIVATE, null);
			Cursor allrows = mydb.rawQuery("SELECT * FROM " + TABLE, null);
			System.out.println("COUNT : " + allrows.getCount());

			if (allrows.moveToFirst()) {
				do {

					String ID = allrows.getString(0);
					String NAME = allrows.getString(1);
					String PLACE = allrows.getString(2);
					my_array.add(NAME);

				} while (allrows.moveToNext());
			}
			allrows.close();
			mydb.close();
		} catch (Exception e) {
			Toast.makeText(getApplicationContext(), "Error encountered.",
					Toast.LENGTH_LONG);
		}
		return my_array;
	}

}

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Download the complete source code for this example from here.

This is a simple example showing how to use tabbars in ANDROID.
First create a new project and copy this code to it.

package com.coderzheaven;

import android.app.TabActivity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TabHost;
import android.widget.TabHost.TabSpec;

public class tabbar extends TabActivity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        /** TabHost will have Tabs */
        TabHost tabHost = (TabHost)findViewById(android.R.id.tabhost);

        /** TabSpec used to create a new tab.
         * By using TabSpec only we can able to setContent to the tab.
         * By using TabSpec setIndicator() we can set name to tab. */

        /** tid1 is firstTabSpec Id. Its used to access outside. */
        TabSpec firstTabSpec = tabHost.newTabSpec("tab_id1");
        TabSpec secondTabSpec = tabHost.newTabSpec("tab_id2");
        TabSpec thirdTabSpec = tabHost.newTabSpec("tab_id3");

        /** TabSpec setIndicator() is used to set name for the tab. */
        /** TabSpec setContent() is used to set content for a particular tab. */
        firstTabSpec.setIndicator("First").setContent(new Intent(this,FirstTab.class));
        secondTabSpec.setIndicator("Second ").setContent(new Intent(this,SecondTab.class));
        thirdTabSpec.setIndicator("Third").setContent(new Intent(this,ThirdTab.class));

        /** Add tabSpec to the TabHost to display. */
        tabHost.addTab(firstTabSpec);
        tabHost.addTab(secondTabSpec);
        tabHost.addTab(thirdTabSpec);

    }
}

Now create three another java files by right clicking the src folder and name it FirstTab.java, SecondTab.java, ThirdTab.java.

Now copy the following code to FirstTab.java.

package com.coderzheaven;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class FirstTab extends Activity {
	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		/* First Tab Content */
		TextView textView = new TextView(this);
		textView.setText("First Tab");
		setContentView(textView);
	}
}

SecondTab.java

package com.coderzheaven;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class SecondTab extends Activity {
	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		/* Second Tab Content */
		TextView textView = new TextView(this);
		textView.setText("Second Tab");
		setContentView(textView);

	}
}
 

Now ThirdTab.java.

package com.coderzheaven;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class ThirdTab extends Activity {
	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		/* Second Tab Content */
		TextView textView = new TextView(this);
		textView.setText("Third Tab");
		setContentView(textView);

	}
}
 

Main.xml file

<?xml version="1.0" encoding="utf-8"?>
<TabHost android:layout_width="fill_parent"
	android:layout_height="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android"
	android:id="@android:id/tabhost">
	<LinearLayout android:id="@+id/LinearLayout01"
		android:orientation="vertical" android:layout_height="fill_parent"
		android:layout_width="fill_parent">
		<TabWidget android:id="@android:id/tabs"
			android:layout_height="wrap_content" android:layout_width="fill_parent"></TabWidget>
		<FrameLayout android:id="@android:id/tabcontent"
			android:layout_height="fill_parent" android:layout_width="fill_parent"></FrameLayout>
	</LinearLayout>
</TabHost>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="tabbar.pack"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
    <activity android:name=".FirstTab" />
	<activity android:name=".SecondTab" />
    <activity android:name=".ThirdTab" />
        <activity android:name=".tabbar"
                  android:label="TabBar Demo">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

TabBar in ANDROID Demo

You can place anything in each tab by setting the contentView or dynamically adding controls.
You can do anything with this tabbar by editing the xml, like placing it below or giving images for each tab etc etc….

Please leave your valuable comments…

This sample code comes handy when you have to check that an application is already installed in your ANDROID Phone.
Call the below function appInstalledOrNot() with the package name of the app installed on the ANDROID Device as a string parameter.

This function returns true if the app is installed otherwise returns false.

import android.app.Activity;
import android.content.pm.PackageManager;
import android.os.Bundle;

public class Example extends Activity
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
    	super.onCreate(savedInstanceState);
    	setContentView(R.layout.main);
    	//Put the package name here...
    	boolean installed  =   appInstalledOrNot("com.Ch.Example.pack");
    	if(installed)
    	{
    	          System.out.println("App already installed om your phone");
    	}
    	else
    	{
    		System.out.println("App is not installed om your phone");
    	}
    }
    private boolean appInstalledOrNot(String uri)
    {
        PackageManager pm = getPackageManager();
        boolean app_installed = false;
        try
        {
               pm.getPackageInfo(uri, PackageManager.GET_ACTIVITIES);
               app_installed = true;
        }
        catch (PackageManager.NameNotFoundException e)
        {
               app_installed = false;
        }
        return app_installed ;
}
}

Hello all…

First layout is named “main.xml” which will look like this.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
	<TextView
	    android:layout_width="fill_parent"
	    android:layout_height="wrap_content"
	    android:text="CoderzHeaven"
	    />
	<EditText
		android:text="CoderzHeaven"
		android:id="@+id/EditText01"
		android:layout_width="fill_parent"
		android:layout_height="wrap_content">
	</EditText>
</LinearLayout>

And the second xml named “second.xml”

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center|center_horizontal" >

<ScrollView
	android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:scrollbars="vertical"
    android:fadeScrollbars="true">

    <LinearLayout
    android:orientation="vertical"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center|center_horizontal" >

		<TextView
			android:text="TextView"
			android:id="@+id/TextView01"
			android:layout_width="fill_parent"
			android:gravity="center"
			android:layout_gravity="center|center_horizontal"
			android:layout_height="wrap_content">
		</TextView>

		<ImageView
			android:id="@+id/ImageView01"
			android:layout_width="wrap_content"
			android:layout_height="wrap_content"
			android:src="@drawable/android_3"
			android:layout_gravity="center|center_horizontal">
		</ImageView>

		<EditText
			android:text="CoderzHeaven"
			android:id="@+id/EditText01"
			android:layout_margin="5dp"
			android:layout_width="fill_parent"
			android:layout_height="wrap_content">
		</EditText>

		<EditText
			android:text=""
			android:id="@+id/EditText02"
			android:layout_margin="5dp"
			android:layout_width="fill_parent"
			android:layout_height="wrap_content">
		</EditText>

		<RatingBar
			android:id="@+id/RatingBar01"
			android:layout_width="wrap_content"
			android:layout_margin="5dp"
			android:layout_height="wrap_content">
		</RatingBar>

		<Button
			android:text="Button"
			android:id="@+id/Button01"
			android:layout_gravity="center|center_horizontal"
			android:layout_width="fill_parent"
			android:layout_margin="5dp"
			android:layout_height="wrap_content">
		</Button>
	</LinearLayout>
</ScrollView>
</LinearLayout>

Now I am going to add these two xml in a single activity. The xml which you add first will have lower z-order.

This is the activity java file.

package com.coderzheaven.pack;

import android.app.Activity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.ViewGroup;

public class ContentViewExample extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        LayoutInflater inflater = getLayoutInflater();
        getWindow().addContentView(inflater.inflate(R.layout.second, null),
        						   new ViewGroup.LayoutParams(
        						   ViewGroup.LayoutParams.FILL_PARENT,
        						   ViewGroup.LayoutParams.FILL_PARENT));
    }
}

Here I am adding the main.xml before second.xml that is why main.xml is below second.xml.
After running this application you will see this window.

You can download the sample code from here.
Please leave your valuable comments if you find this post useful.

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Hello everyone,
Here is a simple example showing how to change the theme of default AlertDialog in android.

To start first create a fresh project named AlertTest.
In the AlertTestDemo.java file copy this code

package com.coderzheaven.pack;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;

public class AlertTestDemo extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        AlertDialog dialog = new CustomDialog(this);
        dialog.setButton("OK", new OnClickListener()
        {
            public void onClick(DialogInterface arg0, int arg1)
            {
            }
        });
        dialog.setTitle("Coderzheaven");
        dialog.setMessage("Heaven of all working codes!! n Keep Visiting..n" +
        		"Thankyou.");
        dialog.show();
    }
}

Now create a file named “styles.xml” inside the res/values folder and copy this code into it.

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <style name="CenterTextView" parent="@android:style/Widget.TextView">
        <item name="android:gravity">center|center_vertical</item>
    </style>

    <style name="CenterJustifyDialogTitle" parent="@android:style/DialogWindowTitle" >
         <item name="android:gravity">center|center_vertical</item>
         <item name="android:textColor">#000000</item>
    </style>

	<style name="CenterJustifyTheme1" parent="@android:style/Theme.Translucent">
        <item name="android:textViewStyle">@style/CenterTextView</item>
        <item name="android:windowTitleStyle">@style/CenterJustifyDialogTitle</item>
    </style>

    <style name="CenterJustifyTheme2" parent="@android:style/Theme.Black">
        <item name="android:textViewStyle">@style/CenterTextView</item>
        <item name="android:windowTitleStyle">@style/CenterJustifyDialogTitle</item>
    </style>

    <style name="CenterJustifyTheme3" parent="@android:style/Theme.Light">
        <item name="android:textViewStyle">@style/CenterTextView</item>
        <item name="android:windowTitleStyle">@style/CenterJustifyDialogTitle</item>
    </style>

</resources>

Now create another java file named “CustomDialog.java” and copy this code into it.
We will apply the theme through this java file.
The theme is located and named in the above xml file.

package com.coderzheaven.pack;
import android.app.AlertDialog;
import android.content.Context;
import com.coderzheaven.pack.R;


public class CustomDialog extends AlertDialog {
		public CustomDialog(Context ctx)
		{
			super(ctx, R.style.CenterJustifyTheme1);
		}
}

Hello android lovers,

In today’s tutorial I will show you how to

1. Create a text file and save a textfile in your SDCARD in your preferred path.

2. Read the contents from the same file and show it in a TextView.

For writing a file we use the FileWriter class and for reading the textfile we use the FileReader class.
Now Let’s check out how we do this .

First create a fresh project and name it “saveFileDemo”.
In the “saveFileDemo.java” file copy this contents.

package com.coderzheaven.pack;

import java.io.FileReader;
import java.io.FileWriter;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class saveFileDemo extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        createFile();
        String file_contents = readFile();
    	System.out.println("FILE CONTENTS :  "  + file_contents);

    	TextView tv = (TextView)findViewById(R.id.tv);
    	tv.setText("Read File contents from SDCARD : n" + file_contents);
    }
    public void createFile(){
    	FileWriter fWriter;
        try{
             fWriter = new FileWriter("/sdcard/myfile.txt");
             fWriter.write("My file contents");
             fWriter.flush();
             fWriter.close();
         }catch(Exception e){
                  e.printStackTrace();
         }
    }
    public String readFile(){
        char buf[] = new char[512];
        FileReader rdr;
        String contents = "";
		try {
			rdr = new FileReader("/sdcard/myfile.txt");
			int s = rdr.read(buf);
			for(int k = 0; k < s; k++){
				contents+=buf[k];
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return contents;
    }
}

This is the main.xml file contents.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView
	android:id = "@+id/tv"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="@string/hello"
    />
</LinearLayout>

Here is the Strings.xml file contents

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="hello">Hello World, saveFileDemo!</string>
    <string name="app_name">saveFileDemo from Coderzheaven</string>
</resources>

Now the AndroidManifest.xml file contents.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.coderzheaven.pack"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".saveFileDemo"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

You can actually see the file by going to the FileExplorer and expanding the mnt folder(or simply SDCARD in older versions) and the SDCARD folder.
See the screenshot.

Check this link to see the contents of this file manually.

Please leave your valuable comments on this post.

Hello everyone….
In today’s tutorial I will show how to start with a HelloWorld Application in PhoneGap for ANDROID.

So what is PhoneGap

PhoneGap is an HTML5 app platform that allows you to author native applications with web technologies and get access to APIs and app stores.

Follow these steps exactly to build the helloworld application.
1.If you don’t have eclipse then download Eclipse Classic from http://www.eclipse.org
For installing eclipse you need to install java.
After installing eclipse run it and set the android directory (If you are not familiar with android please check how to install Android using eclipse)

2.Now download the PhoneGap latest SDK from http://phonegap.com/

3.Open eclipse and create a new project named “phoneGapDemo” as shown in the screenshot below.

4.Now create a folder named “www” inside “assets” as shown in the screenshot

5.Now create a file named “index.html” inside “www” folder and copy this code into it.

<!DOCTYPE HTML>
<!DOCTYPE HTML>
<html>
<head>
<title>PhoneGap</title>
<script type="text/javascript" charset="utf-8" src="phonegap.js"></script>
</head>
<body>
<h1>Hello World, PhoneGapDemo from CoderzHeaven</h1>
</body>
</html>

6.Copy the “phonegap-1.3.0.js” file inside the “www” folder as shown in the screenshot.

7. Create a folder named “libs” inside the project root folder and copy the “phonegap-1.3.0.jar” inside this directory from the zip you downloaded from the above.
Now add this jar to the build path.
Right Click on the project folder and click “Build Path” and add jars and locate the jar inside your project and click ok.

8. Now create a folder named “xml” inside res directory and create two xml inside it.

phonegap.xml

<?xml version="1.0" encoding="utf-8"?>
<phonegap>
    <access origin="http://127.0.0.1*"/>
    <log level="DEBUG"/>
</phonegap>

plugins.xml

<?xml version="1.0" encoding="utf-8"?>
<plugins>
    <plugin name="App" value="com.phonegap.App"/>
    <plugin name="Geolocation" value="com.phonegap.GeoBroker"/>
    <plugin name="Device" value="com.phonegap.Device"/>
    <plugin name="Accelerometer" value="com.phonegap.AccelListener"/>
    <plugin name="Compass" value="com.phonegap.CompassListener"/>
    <plugin name="Media" value="com.phonegap.AudioHandler"/>
    <plugin name="Camera" value="com.phonegap.CameraLauncher"/>
    <plugin name="Contacts" value="com.phonegap.ContactManager"/>
    <plugin name="Crypto" value="com.phonegap.CryptoHandler"/>
    <plugin name="File" value="com.phonegap.FileUtils"/>
    <plugin name="Network Status" value="com.phonegap.NetworkManager"/>
    <plugin name="Notification" value="com.phonegap.Notification"/>
    <plugin name="Storage" value="com.phonegap.Storage"/>
    <plugin name="Temperature" value="com.phonegap.TempListener"/>
    <plugin name="FileTransfer" value="com.phonegap.FileTransfer"/>
    <plugin name="Capture" value="com.phonegap.Capture"/>
</plugins>

9. Now in the java file copy this code

package com.coderzheaven.pack;

import android.os.Bundle;

import com.phonegap.DroidGap;

public class phoneGapDemo extends DroidGap {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        super.loadUrl("file:///android_asset/www/index.html");
    }
}

Now go on and run it. You just created a helloworld application with HTML for android using PhoneGap.

Hello everyone,

I have already showed you how to use a SlidingViewer to create a slidingWindow. Today I will show another way to create such a window with the help of animation.

First Create a file named “SlidingPanel.java” and copy this code into it.

package com.pack.coderzheaven;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.Paint.Style;
import android.util.AttributeSet;
import android.widget.LinearLayout;

public class SlidingPanel extends LinearLayout
{
	private Paint	innerPaint, borderPaint ;

	public SlidingPanel(Context context, AttributeSet attrs) {
		super(context, attrs);
		init();
	}

	public SlidingPanel(Context context) {
		super(context);
		init();
	}

	private void init() {
		innerPaint = new Paint();
		innerPaint.setARGB(100, 25, 25, 75); //gray
		innerPaint.setAntiAlias(true);

		borderPaint = new Paint();
		borderPaint.setARGB(255, 255, 255, 255);
		borderPaint.setAntiAlias(true);
		borderPaint.setStyle(Style.STROKE);
		borderPaint.setStrokeWidth(5);
	}

	public void setInnerPaint(Paint innerPaint) {
		this.innerPaint = innerPaint;
	}

	public void setBorderPaint(Paint borderPaint) {
		this.borderPaint = borderPaint;
	}

    @Override
    protected void dispatchDraw(Canvas canvas) {

    	RectF drawRect = new RectF();
    	drawRect.set(0,0, getMeasuredWidth(), getMeasuredHeight());

    	canvas.drawRoundRect(drawRect, 5, 5, innerPaint);
		canvas.drawRoundRect(drawRect, 5, 5, borderPaint);

		super.dispatchDraw(canvas);
    }
}

This is the layout for the Panel window that comes up. Actually this java file creates gradiant only. No visual components are created with this code.

Now the main.xml, the place where “SlidingPanel ” is used.
Copy this code to your main.xml file

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout	xmlns:android="http://schemas.android.com/apk/res/android"
			    android:orientation="vertical"
        		android:gravity="bottom"
			    android:layout_width="fill_parent"
			    android:layout_height="fill_parent">

    <ImageButton
    		android:id="@+id/show_popup_button"
	        android:layout_width="wrap_content"
	        android:layout_height="wrap_content"
	        android:layout_gravity="left"
			android:background="@drawable/open"
	        />

	<com.pack.coderzheaven.SlidingPanel
			android:id="@+id/popup_window"
    	    android:layout_width="fill_parent"
        	android:layout_height="wrap_content"
        	android:orientation="vertical"
        	android:gravity="left"
        	android:padding="1px"
        	android:background="@drawable/white">

		<LinearLayout	xmlns:android="http://schemas.android.com/apk/res/android"
					    android:orientation="horizontal"
					    android:layout_width="fill_parent"
					    android:layout_height="fill_parent"
					    android:background="@drawable/gradient_bar">

			<TextView
					android:id="@+id/site_name"
			        android:layout_width="wrap_content"
			        android:layout_height="wrap_content"
	        		android:textStyle="bold"
	        		android:textSize="16px"
	        		android:text="CoderzHeaven"
	        		android:layout_gravity="center"
	        		android:layout_alignParentLeft="true"
	        		android:textColor="@drawable/black"
	        		android:layout_weight="1"
	        		android:layout_marginLeft="5px"/>

			<ImageButton android:id="@+id/hide_popup_button"
			        android:layout_width="wrap_content"
			        android:layout_height="wrap_content"
	    			android:layout_alignParentRight="true"
			        android:layout_centerInParent="true"
	    			android:layout_margin="2px"
	    			android:layout_gravity="center"
			        android:background="@drawable/close"/>

		</LinearLayout>

	    <TextView	android:id="@+id/site_description"
			        android:layout_width="wrap_content"
			        android:layout_height="wrap_content"
				android:textColor="@drawable/black"
				android:textStyle="italic"
	        		android:layout_margin="5px"/>

	</com.pack.coderzheaven.SlidingPanel>

</LinearLayout>

Make sure you have all the resources(images) for the xml.

Now create a folder named “anim” inside “res” folder and create an xml named “popup_hide.xml” and another one named “popup_show.xml”
popup_hide.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
	<translate android:fromYDelta="0" android:toYDelta="100%p" android:duration="750"/>
</set>

popup_show.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
	<translate android:fromYDelta="100%p" android:toYDelta="0" android:duration="750"/>
</set>

These two files create the animation for the window.

Now create file named gradient_bar.xml in the “res/drawable” folder and copy this code into it.
This is applied as background for the title in the sliding window.
You can edit the animation files to change the duration of the window coming.

Now the main java file
The file is named “PopUpAnimationDemo.java”

package com.pack.coderzheaven;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ImageButton;
import android.widget.TextView;

public class PopUpAnimationDemo extends Activity {

	private Animation animShow, animHide;

	@Override
	public void onCreate(Bundle icicle) {

        super.onCreate(icicle);
        setContentView(R.layout.main);
        initPopup();
    }

    private void initPopup() {

    	final SlidingPanel popup = (SlidingPanel) findViewById(R.id.popup_window);

    	// Hide the popup initially.....
    	popup.setVisibility(View.GONE);

    	animShow = AnimationUtils.loadAnimation( this, R.anim.popup_show);
    	animHide = AnimationUtils.loadAnimation( this, R.anim.popup_hide);

    	final ImageButton   showButton = (ImageButton) findViewById(R.id.show_popup_button);
    	final ImageButton   hideButton = (ImageButton) findViewById(R.id.hide_popup_button);
    	showButton.setOnClickListener(new View.OnClickListener() {
			public void onClick(View view) {
				popup.setVisibility(View.VISIBLE);
				popup.startAnimation( animShow );
				showButton.setEnabled(false);
				hideButton.setEnabled(true);
        }});

        hideButton.setOnClickListener(new View.OnClickListener() {
			public void onClick(View view) {
				popup.startAnimation( animHide );
				showButton.setEnabled(true);
				hideButton.setEnabled(false);
				popup.setVisibility(View.GONE);
        }});

    	final TextView locationName = (TextView) findViewById(R.id.site_name);
        final TextView locationDescription = (TextView) findViewById(R.id.site_description);

        locationName.setText("CoderzHeaven");
        locationDescription.setText("Heaven of all working codes"
        							+ " A place where you can ask, share & even shout for code! Let’s share a wide range of technology here." +
        	  						" From this site you will get a lot of working examples in your favorite programming languages!." +
        	  						" Always remember we are only one comment away from you… Let’s shorten the distance between your doubts and your answers…");

	}
}

Here is the Strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
  <string name="app_name">Sliding Window Demo</string>
</resources>

Now create a file named colors.xml in the res/values folder and copy this into it

<?xml version="1.0" encoding="utf-8"?>
<resources>
        <string name="select_Category">Select Category</string>
	<drawable name="white">#ffffff</drawable>
	<drawable name="black">#000000</drawable>
	<drawable name="green">#347C2C</drawable>
	<drawable name="pink">#FF00FF</drawable>
	<drawable name="violet">#a020f0</drawable>
	<drawable name="grey">#778899</drawable>
	<drawable name="red">#C11B17</drawable>
	<drawable name="yellow">#FFFF8C</drawable>
	<drawable name="PowderBlue">#b0e0e6</drawable>
	<drawable name="brown">#2F1700</drawable>
	<drawable name="Hotpink">#7D2252</drawable>
	<drawable name="darkgrey">#606060</drawable>
</resources>

Click on the ImagButton to open the sliding Window

Sliding Window

Sliding Window

Download the whole project from here

Please don’t forget to add your valuable comments on this post, because comments are our encouragements for future posts.

Sliding-Drawer in a nice and useful widget in android.

Please check one of my previous posts to do this in another way.

How to show a sliding window from below in Android?

Here is a simple example to demonstrate this.

Create a project named SlidingDrawerDemo and copy this java code into it.

package pack.coderzheaven;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.SlidingDrawer;
import android.widget.Toast;
import android.widget.SlidingDrawer.OnDrawerCloseListener;
import android.widget.SlidingDrawer.OnDrawerOpenListener;

public class slidingDrawerDemo extends Activity implements OnClickListener {

	Button slideButton,b1, b2,b3,b4;
	SlidingDrawer slidingDrawer;

	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		setContentView(R.layout.main);
		slideButton = (Button) findViewById(R.id.slideButton);
		slidingDrawer = (SlidingDrawer) findViewById(R.id.SlidingDrawer);
		b1 = (Button) findViewById(R.id.Button01);
		b2 = (Button) findViewById(R.id.Button02);
		b3 = (Button) findViewById(R.id.Button03);
		b4 = (Button) findViewById(R.id.Button04);

		b1.setOnClickListener(this);
		b2.setOnClickListener(this);
		b3.setOnClickListener(this);
		b4.setOnClickListener(this);

		slidingDrawer.setOnDrawerOpenListener(new OnDrawerOpenListener() {
			@Override
			public void onDrawerOpened() {
				slideButton.setBackgroundResource(R.drawable.closearrow);
			}
		});

		slidingDrawer.setOnDrawerCloseListener(new OnDrawerCloseListener() {
			@Override
			public void onDrawerClosed() {
				slideButton.setBackgroundResource(R.drawable.openarrow);
			}
		});
	}

	@Override
	public void onClick(View v) {
		Button b = (Button)v;
		Toast.makeText(slidingDrawerDemo.this, b.getText() + " Clicked", Toast.LENGTH_SHORT).show();
	}
}

Here is the main.xml code. Make sure to put the resources in the res/drawable folder.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
	xmlns:android="http://schemas.android.com/apk/res/android"
	android:id="@+id/LinearLayout01"
	android:layout_width="fill_parent"
	android:layout_height="fill_parent"
	android:orientation="vertical"
	android:gravity="bottom"
	android:background="@drawable/android">

	<TextView
		android:text="SlidingViewer Demo from CoderzHeaven"
		android:gravity="center|center_vertical"
		android:textColor="#ff0000"
		android:textSize="25sp"
		android:textStyle="bold|italic"
		android:id="@+id/TextView01"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content">
	</TextView>

	<SlidingDrawer
		android:layout_width="wrap_content"
		android:id="@+id/SlidingDrawer"
		android:handle="@+id/slideButton"
		android:content="@+id/contentLayout"
		android:padding="10dip"
		android:layout_height="250dip"
		android:orientation="vertical">
			<Button android:layout_width="wrap_content"
				android:layout_height="wrap_content"
				android:id="@+id/slideButton"
				android:background="@drawable/closearrow">
			</Button>
			<LinearLayout
				android:layout_width="wrap_content"
				android:id="@+id/contentLayout"
				android:orientation="vertical"
				android:gravity="center"
				android:padding="10dip"
				android:background="@drawable/bkg1"
				android:layout_height="wrap_content">
			<Button
				android:id="@+id/Button01"
				android:layout_width="fill_parent"
				android:layout_height="wrap_content"
				android:background="@drawable/yellow_button"
				android:layout_margin="2dp"
				android:text="Option1">
			</Button>
			<Button
				android:id="@+id/Button02"
				android:layout_width="fill_parent"
				android:layout_height="wrap_content"
				android:background="@drawable/blue_button"
				android:layout_margin="2dp"
				android:text="Option2"></Button>
			<Button android:id="@+id/Button03"
				android:layout_width="fill_parent"
				android:layout_height="wrap_content"
				android:layout_margin="2dp"
				android:background="@drawable/yellow_button"
				android:text="Option3">
			</Button>
			<Button android:id="@+id/Button04"
				android:layout_width="fill_parent"
				android:layout_height="wrap_content"
				android:layout_margin="2dp"
				android:background="@drawable/blue_button"
				android:text="Option4">
			</Button>
		</LinearLayout>
	</SlidingDrawer>
</LinearLayout>

PLease leave your valuable comments on this post.

Hello everyone,

I have shown two methods to upload files in android.
In today’s tutorial I will show another simple method to upload files. With this method you can upload multiple files in one request + you can send your own string parameters with them.

Here is another method on working with uploading of images.
How to upload an image from Android device to server? – Method 4

These are the things to do after creating the project.
1. You have to include two libraries in the your project build path(Download these libraries from here apache-mime4j-0.6.jar and httpmime-4.0.1.jar).
2. Add these libraries to the project build path.
3. Here you can see the the other things you need to remember while connecting to a server.

Refer the image

Note : I am working here on the local system as server. So I have used the server domain name as 10.0.2.2. Please change this according to your need.

OK Now open your main java file and copy this code into it.

package pack.coderzheaven;

import java.io.File;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.mime.MultipartEntity;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.entity.mime.content.StringBody;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Color;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class FileUploadTest extends Activity {

	private static final int SELECT_FILE1 = 1;
	private static final int SELECT_FILE2 = 2;
	String selectedPath1 = "NONE";
	String selectedPath2 = "NONE";
	TextView tv, res;
	ProgressDialog progressDialog;
	Button b1,b2,b3;
	HttpEntity resEntity;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        tv = (TextView)findViewById(R.id.tv);
        res = (TextView)findViewById(R.id.res);
        tv.setText(tv.getText() + selectedPath1 + "," + selectedPath2);
        b1 = (Button)findViewById(R.id.Button01);
        b2 = (Button)findViewById(R.id.Button02);
        b3 = (Button)findViewById(R.id.upload);
        b1.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				openGallery(SELECT_FILE1);
			}
		});
        b2.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				openGallery(SELECT_FILE2);
			}
		});
        b3.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				if(!(selectedPath1.trim().equalsIgnoreCase("NONE")) && !(selectedPath2.trim().equalsIgnoreCase("NONE"))){
					progressDialog = ProgressDialog.show(FileUploadTest.this, "", "Uploading files to server.....", false);
		       		 Thread thread=new Thread(new Runnable(){
		           	        public void run(){
		           	       		doFileUpload();
		           	            runOnUiThread(new Runnable(){
		           	                public void run() {
		           	                    if(progressDialog.isShowing())
		           	                    	progressDialog.dismiss();
		           	                }
		           	            });
		           	        }
		   	        });
		   	        thread.start();
				}else{
	  	                	Toast.makeText(getApplicationContext(),"Please select two files to upload.", Toast.LENGTH_SHORT).show();
				}
	        }
		});

    }

    public void openGallery(int req_code){

   	 	Intent intent = new Intent();
        intent.setType("image/*");
        intent.setAction(Intent.ACTION_GET_CONTENT);
        startActivityForResult(Intent.createChooser(intent,"Select file to upload "), req_code);
   }

   public void onActivityResult(int requestCode, int resultCode, Intent data) {

	    if (resultCode == RESULT_OK) {
	    	Uri selectedImageUri = data.getData();
	        if (requestCode == SELECT_FILE1)
	        {
	            selectedPath1 = getPath(selectedImageUri);
	         	System.out.println("selectedPath1 : " + selectedPath1);
	        }
	        if (requestCode == SELECT_FILE2)
	        {
	            selectedPath2 = getPath(selectedImageUri);
	         	System.out.println("selectedPath2 : " + selectedPath2);
	        }
	        tv.setText("Selected File paths : " + selectedPath1 + "," + selectedPath2);
	    }
	}

    public String getPath(Uri uri) {
	    String[] projection = { MediaStore.Images.Media.DATA };
	    Cursor cursor = managedQuery(uri, projection, null, null, null);
	    int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
	    cursor.moveToFirst();
	    return cursor.getString(column_index);
	}

    private void doFileUpload(){

    	File file1 = new File(selectedPath1);
    	File file2 = new File(selectedPath2);
        String urlString = "http://10.0.2.2/upload_test/upload_media_test.php";
        try
        {
        	 HttpClient client = new DefaultHttpClient();
             HttpPost post = new HttpPost(urlString);
	         FileBody bin1 = new FileBody(file1);
	         FileBody bin2 = new FileBody(file2);
	         MultipartEntity reqEntity = new MultipartEntity();
	         reqEntity.addPart("uploadedfile1", bin1);
	         reqEntity.addPart("uploadedfile2", bin2);
	         reqEntity.addPart("user", new StringBody("User"));
	         post.setEntity(reqEntity);
	         HttpResponse response = client.execute(post);
	         resEntity = response.getEntity();
	         final String response_str = EntityUtils.toString(resEntity);
	         if (resEntity != null) {
	             Log.i("RESPONSE",response_str);
	        	 runOnUiThread(new Runnable(){
	 	                public void run() {
	 	                	 try {
	 	                		res.setTextColor(Color.GREEN);
	 							res.setText("n Response from server : n " + response_str);
	 							Toast.makeText(getApplicationContext(),"Upload Complete. Check the server uploads directory.", Toast.LENGTH_LONG).show();
	 						} catch (Exception e) {
	 							e.printStackTrace();
	 						}
	 	                   }
	 	            });
	         }
        }
        catch (Exception ex){
             Log.e("Debug", "error: " + ex.getMessage(), ex);
        }
      }
}

Now the layout for this file main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Multiple File Upload from CoderzHeaven"
    />
<Button
    android:id="@+id/Button01"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Get First File">
</Button>
<Button
    android:id="@+id/Button02"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Get Second File">
</Button>
<Button
    android:id="@+id/upload"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Start Upload">
</Button>
<TextView
	android:id="@+id/tv"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Selected File path : "
    />

<TextView
	android:id="@+id/res"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text=""
   />
</LinearLayout>

Now the AndroidManifest file(Remember to add the permission for accessing internet)

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="pack.coderzheaven"
      android:versionCode="1"
      android:versionName="1.0">

      <uses-permission android:name="android.permission.INTERNET" />

    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".FileUploadTest"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

Now the server side(Here it is written in PHP)
upload_media_test.php file contents

<?php
$target_path1 = "uploads/";
$target_path2 = "uploads/";
/* Add the original filename to our target path.
Result is "uploads/filename.extension" */
$target_path1 = $target_path1 . basename( $_FILES['uploadedfile1']['name']);
if(move_uploaded_file($_FILES['uploadedfile1']['tmp_name'], $target_path1)) {
    echo "The first file ".  basename( $_FILES['uploadedfile1']['name']).
    " has been uploaded.";
} else{
    echo "There was an error uploading the file, please try again!";
    echo "filename: " .  basename( $_FILES['uploadedfile1']['name']);
    echo "target_path: " .$target_path1;
}

$target_path2 = $target_path2 . basename( $_FILES['uploadedfile2']['name']);
if(move_uploaded_file($_FILES['uploadedfile2']['tmp_name'], $target_path2)) {
    echo "n The second file ".  basename( $_FILES['uploadedfile2']['name']).
    " has been uploaded.";
} else{
    echo "There was an error uploading the file, please try again!";
    echo "filename: " .  basename( $_FILES['uploadedfile2']['name']);
    echo "target_path2: " .$target_path2;
}

$user = $_REQUEST['user'];
echo "n String Parameter send from client side : " . $user;
?>

Please leave your comments. If you like this post, please hit a “+1″ for this post and share it across your networks.

Hi all…….
In today’s exampl e I will show you how to deal with global variables in ANDROID.
You know global variables are those variables that you can access across any variables.
It’s value becomes changed when you change it in any of the classes in your project. These types of variables act as like cookies in a browser to store your login information across different pages. Now Let’s see how to implement this………
For this demo I am using three classes, one is the global class which has the global variable and other two normal classes.
In the global class I have a variable named “global_var” which I am accessing across the other two classes and I am changing the value across the classes. Please check the Logcat for seeing the output.

First class “Global_var_test.java”

package pack.coderzheaven.test;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class Global_var_test extends Activity {

	Button b;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main1);

        b = (Button)findViewById(R.id.Button01);
        GlobalClass global = new GlobalClass();
        System.out.println("var1 value in first class before changing = " + global.global_var1);
        global.global_var1 = "value2";
        System.out.println("var1 value in first class after changing = " + global.global_var1);

        b.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				startActivity(new Intent(Global_var_test.this, SecondClass.class));
			}
		});
    }
}

Next SecondClass.java

package pack.coderzheaven.test;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class SecondClass extends Activity{

		Button b;
		@Override
	    public void onCreate(Bundle savedInstanceState) {
	        super.onCreate(savedInstanceState);
	        setContentView(R.layout.main2);

	        b = (Button)findViewById(R.id.Button01);

	        GlobalClass global = new GlobalClass();
	        System.out.println("var1 value in second class before changing = " + global.global_var1);
	        global.global_var1 = "value3";
	        System.out.println("var1 value in second class after changing = " + global.global_var1);

	        b.setOnClickListener(new OnClickListener() {
				@Override
				public void onClick(View v) {
					startActivity(new Intent(SecondClass.this, SecondClass.class));
				}
			});
	    }

}

Now the GlobalClass.java which holds the global variable.
You can have any datatype as global variable….

package pack.coderzheaven.test;

import android.app.Application;

class GlobalClass extends Application{

	String global_var1 = "Value1";

}

Please check your logcat to see the global value changes…..
Get more ANDROID posts from here
Happy coding………
Please leave your valuable comments………

Hi all…….
In today’s exampl e I will show you how to deal with global variables in ANDROID.
You know global variables are those variables that you can access across any variables.
It’s value becomes changed when you change it in any of the classes in your project. These types of variables act as like cookies in a browser to store your login information across different pages. Now Let’s see how to implement this………
For this demo I am using three classes, one is the global class which has the global variable and other two normal classes.
In the global class I have a variable named “global_var” which I am accessing across the other two classes and I am changing the value across the classes. Please check the Logcat for seeing the output.

First class “Global_var_test.java”

package pack.coderzheaven.test;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class Global_var_test extends Activity {

	Button b;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main1);

        b = (Button)findViewById(R.id.Button01);
        GlobalClass global = new GlobalClass();
        System.out.println("var1 value in first class before changing = " + global.global_var1);
        global.global_var1 = "value2";
        System.out.println("var1 value in first class after changing = "; + global.global_var1);

        b.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				startActivity(new Intent(Global_var_test.this, SecondClass.class));
			}
		});
    }
}

Next SecondClass.java

package pack.coderzheaven.test;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class SecondClass extends Activity{

		Button b;
		@Override
	    public void onCreate(Bundle savedInstanceState) {
	        super.onCreate(savedInstanceState);
	        setContentView(R.layout.main2);

	        b = (Button)findViewById(R.id.Button01);

	        GlobalClass global = new GlobalClass();
	        System.out.println("var1 value in second class before changing = " + global.global_var1);
	        global.global_var1 = "value3";
	        System.out.println("var1 value in second class after changing = " + global.global_var1);

	        b.setOnClickListener(new OnClickListener() {
				@Override
				public void onClick(View v) {
					startActivity(new Intent(SecondClass.this, SecondClass.class));
				}
			});
	    }

}

Now the GlobalClass.java which holds the global variable.
You can have any datatype as global variable….

package pack.coderzheaven.test;

import android.app.Application;

class GlobalClass extends Application{

	String global_var1 = "Value1"

}

Please leave your valuable comments………

Hello all……..
In today’s post I will show you send mail from an android application progrmatically..
Let’s go to the code fast……
This is the code in the mail java file….

package com.coderzheaven;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class sendMailDemo extends Activity {
    Button send;
    EditText address, subject, emailbody;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        address = (EditText) findViewById(R.id.address);
        subject = (EditText) findViewById(R.id.subject);
        emailbody = (EditText) findViewById(R.id.body);
        send = (Button) findViewById(R.id.send);

        send.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
            	sendEmail();
            }
        });
    }

    public void sendEmail(){

    	if(!address.getText().toString().trim().equalsIgnoreCase("")){
    	  final Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND);
	      emailIntent.setType("plain/text");
	      emailIntent.putExtra(android.content.Intent.EXTRA_EMAIL, new String[]{ address.getText().toString()});
	      emailIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, subject.getText());
	      emailIntent.putExtra(android.content.Intent.EXTRA_TEXT, emailbody.getText());
	      sendMailDemo.this.startActivity(Intent.createChooser(emailIntent, "Send mail..."));
	    }
    	else{
    		Toast.makeText(getApplicationContext(), "Please enter an email address..", Toast.LENGTH_LONG).show();
    	}
      }
	}

Now the layout file (main.xml)

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:id="@+id/LinearLayout01" android:layout_width="fill_parent"
	android:layout_height="fill_parent"
	xmlns:android="http://schemas.android.com/apk/res/android"
	android:orientation="vertical"
	android:background="@drawable/android"
	>
	<TextView
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:id="@+id/emailaddress"
		android:text="Email Address"
		android:textStyle="bold">
	</TextView>

	<EditText
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:width="250dip"
		android:hint="email address"
		android:id="@+id/address">
	</EditText>

	<TextView
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:text="Subject"
		android:textStyle="bold">
	</TextView>

	<EditText
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:width="250dip"
		android:hint="Subject"
		android:id="@+id/subject">
	</EditText>

	<TextView
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:text="Your Message"
		android:textStyle="bold">
	</TextView>
	<EditText
		android:layout_width="fill_parent"
		android:layout_height="wrap_content"
		android:lines="5"
		android:hint="Your message here!!"
		android:id="@+id/body">
	</EditText>
	<Button
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:id="@+id/send"
		android:text="Send Email"
		android:width="150dip">
	</Button>
</LinearLayout>

The AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.coderzheaven"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="Send Mail Demo">
        <activity android:name=".sendMailDemo"
                  android:label="Send Mail Demo">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

Note: However if you test this in your emulator, it will not work. Install it in your device to test it.