CoderzHeaven

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>

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 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…

When a new sms message is received by the device, a Broadcast Receiver is registered. For this

IntentFilter filter = new IntentFilter(SMS_RECEIVED);
registerReceiver(receiver_SMS, filter);

should be included . Also sms are sent in PDU’s(Protocol Description Units) format, which act as an encapsulation.
Inorder to extract from PDU to byte array

messages[i] = SmsMessage.createFromPdu((byte[]) pdus[i]);

method is used.
When sms comes, the BroadCast listener is activated and sms sender number is showed in a ListView

package com.coderzheaven.pack;

import java.util.ArrayList;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.telephony.SmsMessage;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class smsReceiver extends Activity
{
    /** Called when the activity is first created. */
	 public static final String SMS_RECEIVED = "android.provider.Telephony.SMS_RECEIVED";
	 ListView list;
	 ArrayList<String> messageList;
	 ArrayAdapter< String> adapter;
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        list = (ListView) findViewById(R.id.listView1);

        messageList  = new ArrayList<String>();
        //messageList.add("check");
       adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, messageList);
       list.setAdapter(adapter);

        IntentFilter filter = new IntentFilter(SMS_RECEIVED);
        registerReceiver(receiver_SMS, filter);
    }
    BroadcastReceiver receiver_SMS = new BroadcastReceiver()
    {
		public void onReceive(Context context, Intent intent)
		{
			 if (intent.getAction().equals(SMS_RECEIVED))
			 {
			        Bundle bundle = intent.getExtras();
			        if (bundle != null)
			        {
			          Object[] pdus = (Object[]) bundle.get("pdus");
			          SmsMessage[] messages = new SmsMessage[pdus.length];

			          for (int i = 0; i < pdus.length; i++)
			            messages[i] = SmsMessage.createFromPdu((byte[]) pdus[i]);

			          for (SmsMessage message : messages)
			          {
			            	 Toast.makeText(smsReceiver.this, "----"+message.getDisplayMessageBody(), Toast.LENGTH_LONG).show();
			            	 receivedMessage(message.getDisplayOriginatingAddress());
			          }
			        }
			      }
		}
	};
	private void receivedMessage(String message)
	{
		messageList.add(message);
		adapter.notifyDataSetChanged();
	}
}

The xml hold a ListView

<?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="@string/hello"
    />
<ListView android:layout_height="fill_parent"
	android:id="@+id/listView1"
	android:layout_width="fill_parent"/>
</LinearLayout>

Also important part is that, for an application to listen an SMS Intent Broadcast should be added

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

This post explains How to get the SMS sent to your emulator within your application

Beautifying our applications is one of the main features of your application’s success.
In ANDROID there are many possible ways to do this.
For eg. We need to have different colors for our buttons, However we can give backgrounds for buttons and all. But we can do many by using our custom xml files, like changing colors on button press and release, transitions etc. This tutorial explains such an example. Extend this example to create your own custom button.

Create a fresh project and copy this code to your main file.

package pack.coderzheaven;

import android.app.Activity;
import android.content.res.Resources;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.TransitionDrawable;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.TextView;

public class SelectorExample extends Activity {
    private Button b;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        b = (Button) findViewById(R.id.Button01);
        b.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				System.out.println("Button clicked!!");
			}
		});

        ImageButton button = (ImageButton) findViewById(R.id.button);
        TransitionDrawable drawable = (TransitionDrawable) button.getDrawable();
        drawable.startTransition(5000);

        Resources res = getResources();
        Drawable shape = res. getDrawable(R.drawable.gradient_box);

        TextView tv = (TextView)findViewById(R.id.textview);
        tv.setBackgroundDrawable(shape);
    }
}

Now the main.xml file

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

	<ImageButton android:id="@+id/button"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:src="@drawable/transition">
	</ImageButton>

	<TextView
		android:id="@+id/textview"
		android:text="CoderzHeaven"
	    android:layout_height="wrap_content"
	    android:layout_width="fill_parent" />
	<Button android:id="@+id/Button01"
		android:background="@drawable/buttonhighlight"
		android:layout_height="50px"
		android:layout_width="fill_parent"
		android:text="CoderzHeaven"	>
	</Button>
</LinearLayout>

Now create an xml file named “gradient_box.xml” in your drawable folder and copy this code to it.
This xml helps you to define the shape for the view for which you are applying this.

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <gradient
        android:startColor="#FFFF0000"
        android:endColor="#80FF00FF"
        android:angle="45"/>
    <padding android:left="7dp"
        android:top="7dp"
        android:right="7dp"
        android:bottom="7dp" />
    <corners android:radius="8dp" />
</shape>

Now create an xml file named “transition.xml” in your drawable folder and copy this code to it.
This xml file is for applying a transition for your view

<?xml version="1.0" encoding="utf-8"?>
<transition xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/on" />
    <item android:drawable="@drawable/off" />
</transition>

Now the AndroidManifest.xml file

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="pack.selectors"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".SelectorExample"
                  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>

Note: Make sure that you have all the images in your drawable folder as shown in the image below.

See the ImageButton transformation in the consequent pictures.

Please leave your comments if you find this post useful!

Hi,

Want to try out a simple hide and show toggle using jQuery? The example given below shows how you can simply hide and show a paragraph in html using jQuery. Try it out!

<html>
<head>

<script type="text/javascript" src="jquery.js"></script>

<script type="text/javascript">

$(document).ready(function(){

  $("#hideMe").click(function(){
    $("p").hide();
  });

  $("#showMe").click(function(){
    $("p").show();
  });

});

</script>

</head>

<body>
<p>Coderz Heaven! Click 'HideMe' for hiding! Click 'ShowMe' for showing</p>
<button id="hideMe">HideMe</button>
<button id="showMe">ShowMe</button>
</body>
</html>

Hi all……

This is a simple example to create and delete a directory in ANDROID.
Here the directly is created in the SDCARD. So first create an SDCARD and start the emulator with the SDCARD.

Let’s look at the program.
Use can use this program to create or delete a file in ANDROID also.

package pack.coderzheaven;

import java.io.File;
import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.os.StatFs;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class CreateDeleteDIR_Example extends Activity {

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

        t = (TextView)findViewById(R.id.tv);
        b= (Button) findViewById(R.id.Button01);
        File dir = new File("/sdcard/new_dir");
        try{
          if(dir.mkdir()) {
             System.out.println("Directory created");
             t.setText("Directory created");
          } else {
             System.out.println("Directory is not created");
             t.setText("Directory is not created");
          }
        }catch(Exception e){
          e.printStackTrace();
        }

        b.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				File del = new File("/sdcard/new_dir");
				 boolean success = del.delete();
			        if (!success) {
			           System.out.println("Deletion of directory failed!");
			        }
			}
        });

    	/* IF THE DIRECTORY IS NOT EMPTY . USE THIS FUNCTION */
	public static boolean deleteNon_EmptyDir(File dir) {
	    if (dir.isDirectory()) {
	        String[] children = dir.list();
	        for (int i=0; i<children.length; i++) {
	            boolean success = deleteNon_EmptyDir(new File(dir, children[i]));
	            if (!success) {
	                return false;
	            }
	        }
	    }
	    return dir.delete();
	}
}

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:id="@+id/tv"
    />
<Button
	android:text="Delete Directory"
	android:id="@+id/Button01"
	android:layout_width="wrap_content"
	android:layout_height="wrap_content">
</Button>
</LinearLayout>

Now go to File-explorer in the window menu->show View and see the result.

After directory creation.

After directory deletion.

Hi,

If you want to show the latest twitter update of yours in your blogger/blogspot, then use the following steps.
1. Go to your blogger ‘Design’
2. Click ‘Add A Gadget’
3. Add ‘HTML/JavaScript’
4. Paste the following JavaScript code into it and save

<div class="twitter-desc">
<ul id="twitter_update_list"><li></li></ul>
<script src="http://twitter.com/javascripts/blogger.js" type="text/javascript"></script>
<script src="http://twitter.com/statuses/user_timeline/SampleURL.json?callback=twitterCallback2&amp;count=1" type="text/javascript"></script>
</div>

5. Done!

Note : Replace ‘SampleURL’ with your twitter id & you can set the number of twitter updates to be shown using the ‘count’, here count is set to 1.

A series of frames is drawn one after the other at regular intervals.
For this create a xml which contains ImageView for showing the animation

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


   <ImageView
      android:id="@+id/Image"
       android:layout_gravity="center_horizontal"
      android:layout_width="wrap_content"
      android:background="@drawable/d1"
      android:layout_height="wrap_content"/>

      <Button
      android:id="@+id/startFAButtonId"
      android:layout_width="wrap_content"
      android:layout_gravity="center_horizontal"
      android:layout_height="wrap_content"
      android:text="Start Animation"
      />
</LinearLayout>

The main java file is

package com.coderzheaven.animation;

import android.app.Activity;
import android.graphics.drawable.AnimationDrawable;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

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

        Button b = (Button)this.findViewById(R.id.startFAButtonId);
        b.setOnClickListener(new View.OnClickListener()
        {
			public void onClick(View v)
			{
				animate();
			}
		});

    }
 	   private void animate() {
 	      ImageView imgView = (ImageView)findViewById(R.id.Image);
 	      imgView.setVisibility(ImageView.VISIBLE);
 	      imgView.setBackgroundResource(R.drawable.animation_frame);

 	      AnimationDrawable frameAnimation =  (AnimationDrawable) imgView.getBackground();

 	      if (frameAnimation.isRunning()) {
 	         frameAnimation.stop();
 	      }
 	      else {
 	         frameAnimation.stop();
 	         frameAnimation.start();
 	      }
 	   }
 }

Next the main part, an xml which holds each image and duration in which each image shows.
The xml should be placed inside drawable folder

<?xml version="1.0" encoding="utf-8"?>
<animation-list
	 xmlns:android="http://schemas.android.com/apk/res/android"
android:oneshot="false">
   <item android:drawable="@drawable/d1" android:duration="50" />
   <item android:drawable="@drawable/d2" android:duration="50" />
   <item android:drawable="@drawable/d3" android:duration="50" />
   <item android:drawable="@drawable/d4" android:duration="50" />
   <item android:drawable="@drawable/d5" android:duration="50" />
</animation-list>

When i click the button the animation will start

For implementing a ListView, we first create a xml which contains a ListView named list.xml

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

  <ListView
    android:id="@+id/listview"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    />
</LinearLayout>

Next we create a Dialog Object and inflate the above xml and when the listItem is clicked then a Alert Dialog windows comes
The java file is listed below

import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.AdapterView.OnItemClickListener;

public class DialoglistView extends Activity implements OnItemClickListener{
    /** Called when the activity is first created. */
	String[] val = {"sunday","monday","tuesday","thrusday","friday","wednesday","march"};
	ListView list;
	Dialog listDialog;
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
         showdialog();
    }

    private void showdialog()
    {
    	listDialog = new Dialog(this);
    	listDialog.setTitle("Select Item");
    	 LayoutInflater li = (LayoutInflater) this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    	 View v = li.inflate(R.layout.list, null, false);
    	 listDialog.setContentView(v);
    	 listDialog.setCancelable(true);
         //there are a lot of settings, for dialog, check them all out!

         ListView list1 = (ListView) listDialog.findViewById(R.id.listview);
         list1.setOnItemClickListener(this);
         list1.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, val));
         //now that the dialog is set up, it's time to show it
         listDialog.show();
    }

	public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3)
	{

		AlertDialog.Builder builder = new AlertDialog.Builder(this);
		builder.setMessage("Delete item "+arg2)
		           .setPositiveButton("OK ", new DialogInterface.OnClickListener() {
		           public void onClick(DialogInterface dialog, int id) {
		        	   System.out.println("OK CLICKED");

		           }
		       });
		builder.setNegativeButton("cancel", new DialogInterface.OnClickListener() {
	           public void onClick(DialogInterface dialog, int id) {
	        	 dialog.dismiss();
	        	 listDialog.cancel();

	           }
	       });

		AlertDialog alert = builder.create();
		alert.setTitle("Information");
		alert.show();
	}
}

The alert window look like this

When the Item is selected then

Hello all……
By default telnet is not enabled in Windows Vista and Windows 7.
So you need to turn own the option for telnet .
For this
1. Open control Panel
2. Programs and features
3. Turn Windows feature On or OFF
4. Check Telnet Client.

Now open command prompt and run telnet

The Telnet program

First create a database  named “mydatabase” in MySql. Then create a table “tbl_user” with three fields (id, username and password).

The next step is to create a php page which will communicate between the  MySql database and the android application.

For this create a “Connections.php” page as shown below. It will set up a  connection to the database with the username and password

$hostname_localhost ="localhost";
$database_localhost ="mydatabase";
$username_localhost ="root";
$password_localhost ="";

$localhost = mysql_connect($hostname_localhost,$username_localhost,$password_localhost)
or
trigger_error(mysql_error(),E_USER_ERROR);

Then the main PHP file is to be created. Actually the android application will call this php file along with the data(username and password ) and this code will check the database. If the details is valid then it will return “Y” and otherwise return “N”.

Here the data is passed as POST method. We can also use GET method where the data is passed along with the url . Android support both these two features.

<?php require_once('yourfolder/Connections.php'); mysql_select_db($database_localhost,$localhost);

$useremail = $_POST['UserEmail'];
$password = $_POST['Password'];

 $query_search = "select * from tbl_user where username = '".$useremail."' AND password = '".$password. "'";
 $query_exec = mysql_query($query_search) or die(mysql_error());
 $rows = mysql_num_rows($query_exec);

 if($rows --> 0) { echo "Y"; }
else  {echo "N"; }

So by now we created php and the database part. Then we have to focus on android section. For this first create a xml file which will be our login screen.The screen look like this.

The layout of the xml is displayed below.

<RelativeLayout
	  xmlns:android="http://schemas.android.com/apk/res/android"
	  android:layout_width="fill_parent"
	  android:layout_height="fill_parent"
	  android:background="#ff2a1703"
	  android:fadingEdge="horizontal">
	 <TextView
	 		android:id="@+id/text"
	 		android:text="manage your projects..."
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:typeface="serif"
            android:textStyle="italic"
            android:layout_centerHorizontal="true"
            android:layout_alignParentTop="true"
            android:layout_marginTop="50dip"
            android:textSize="20sp" >
     </TextView>
	 <EditText
			android:id="@+id/username"
			android:layout_width="213dip"
			android:layout_marginTop="60dp"
			android:layout_below ="@+id/text"
			android:layout_centerHorizontal="true"
			android:layout_height="wrap_content"
			android:hint="username"
			android:gravity="center"
			android:textSize="18sp"
			android:typeface="sans"
			android:textStyle="italic">
	 </EditText>
	 <EditText
			android:id="@+id/password"
			android:layout_width="211px"
			android:layout_height="wrap_content"
			android:hint="password"
			android:textSize="18sp"
			android:typeface="sans"
			android:textStyle="italic"
			android:gravity="center"
			android:password="true"
			android:layout_marginTop="20dp"
			android:layout_below ="@+id/username"
			android:layout_centerHorizontal="true">
	 </EditText>
 	 <CheckBox
			android:id="@+id/check"
			android:layout_width="wrap_content"
			android:layout_height="wrap_content"
			android:text="Remember me"
			android:layout_marginTop="10dp"
			android:layout_below ="@+id/password"
			android:layout_centerHorizontal="true">
	 </CheckBox>
	 <Button
			android:id="@+id/login"
			android:layout_width="141px"
			android:layout_height="wrap_content"
			android:text="Login"
			android:textSize="22sp"
			android:typeface="serif"
			android:textStyle="bold"
			android:layout_marginTop="20dp"
			android:layout_below ="@+id/check"
			android:layout_centerHorizontal="true">
	 </Button>
</RelativeLayout>

We now create the java file . This file should contain the 3 sections

1. Store the preference when the checkbox is checked
2. Establish a connection between this file and the php file
3. Validate the user

package com.ar.mydatabaseProject.pack;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import android.widget.Toast;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import android.preference.PreferenceActivity;
import android.preference.PreferenceManager;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class mydatabaseProject extends Activity
{
    /** Called when the activity is first created. */

	Button login;
	String name="",pass="";
	EditText username,password;
	TextView tv;
	byte[] data;
	HttpPost httppost;
	StringBuffer buffer;
	HttpResponse response;
	HttpClient httpclient;
	InputStream inputStream;
	SharedPreferences app_preferences ;
	List<NameValuePair> nameValuePairs;
	CheckBox check;
	public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.login);
        app_preferences = PreferenceManager.getDefaultSharedPreferences(this);
        username = (EditText) findViewById(R.id.username);
        password = (EditText) findViewById(R.id.password);
        login = (Button) findViewById(R.id.login);
        check = (CheckBox) findViewById(R.id.check);

        String Str_user = app_preferences.getString("username","0" );
	    String Str_pass = app_preferences.getString("password", "0");
	    String Str_check = app_preferences.getString("checked", "no");
        if(Str_check.equals("yes"))
        {
        		username.setText(Str_user);
        		password.setText(Str_pass);
        		check.setChecked(true);
        }
        login.setOnClickListener(new View.OnClickListener()
        {
			public void onClick(View v)
			{
				name = username.getText().toString();
				pass = password.getText().toString();
				String Str_check2 = app_preferences.getString("checked", "no");
				if(Str_check2.equals("yes"))
				{
					SharedPreferences.Editor editor = app_preferences.edit();
					editor.putString("username", name);
					editor.putString("password", pass);
					 editor.commit();
				}
				if(name.equals("") || pass.equals(""))
				{
					 Toast.makeText(mydatabaseProject.this, "Blank Field..Please Enter", Toast.LENGTH_LONG).show();
				}
				else
				{


			    try {
			    	httpclient = new DefaultHttpClient();
				    httppost = new HttpPost("http://10.0.2.2/android/user_validate.php");
			        // Add your data
			        nameValuePairs = new ArrayList<NameValuePair>(2);
			       nameValuePairs.add(new BasicNameValuePair("UserEmail", name.trim()));
			        nameValuePairs.add(new BasicNameValuePair("Password", pass.trim()));
			        httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

			        // Execute HTTP Post Request
			        response = httpclient.execute(httppost);
			        inputStream = response.getEntity().getContent();

			        data = new byte[256];

			        buffer = new StringBuffer();
	                int len = 0;
	                while (-1 != (len = inputStream.read(data)) )
	                {
	                    buffer.append(new String(data, 0, len));
	                }

	                inputStream.close();
			    }

			    catch (Exception e)
			    {
			    	Toast.makeText(mydatabaseProject.this, "error"+e.toString(), Toast.LENGTH_LONG).show();
			    }
			    if(buffer.charAt(0)=='Y')
			    {
			    	Toast.makeText(mydatabaseProject.this, "login successfull", Toast.LENGTH_LONG).show();
			    }
			    else
			    {
			    	Toast.makeText(mydatabaseProject.this, "Invalid Username or password", Toast.LENGTH_LONG).show();
			    }
				}
			}
		});
        check.setOnClickListener(new View.OnClickListener()
        {
            public void onClick(View v)
            {
                // Perform action on clicks, depending on whether it's now checked
            	SharedPreferences.Editor editor = app_preferences.edit();
                if (((CheckBox) v).isChecked())
                {


                	 editor.putString("checked", "yes");
                	 editor.commit();
                }
                else
                {
                	 editor.putString("checked", "no");
                	 editor.commit();
                }
            }
        });
    }
        public void Move_to_next()
        {

        //	startActivity(new Intent(this, zzz.class));
        }
}

At last don’t forget to put the permission in Manifest file

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

Note : if you have any problem in working with this post, please check this more simple version here.

Here is another more detailed explanation.

How to create Simple Login form using php in android? – Connect php with android.

Hi all….
In this tutorial I will teach you how to make use of Gestures in ANDROID and make your own application.
Follow the below steps exactly to get an idea of how to use gestures.

1. Make a gesture Library.
2. Add your own gestures into it.
3. Export it to your applications and use it.

It is as simple as that…
Now let’s start………………..

1. Making a gesture library.

First start your emulator with the SD CARD .
Creating an SDCARD and starting the emulator with the SDCARD is explained in this
tutorial here then you have to download the whole project from the website here that
has the output as shown below in the screenshot.

Draw some of the gestures and save it. This is important.
Then only you can reproduce it in your own application.

Now go to file explorer and pull out the gestures file under the SDCARD from the
emulator and save it anywhere on your computer.

How to export a file from the SDCARD is covered in this tutorial

Now you have the gestures library, now you can use this in your own application.
Actually steps 2 and 3 are already covered.
Now we will make our own application and use the exported gesture library.
Next create another project and name the file GestureTestTwo.java and copy the following
code to it.

GestureTestTwo.java

package com.GestureTestTwo;

import java.util.ArrayList;
import android.app.Activity;
import android.gesture.Gesture;
import android.gesture.GestureLibraries;
import android.gesture.GestureLibrary;
import android.gesture.GestureOverlayView;
import android.gesture.Prediction;
import android.gesture.GestureOverlayView.OnGesturePerformedListener;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;

public class GestureTestTwo extends Activity {
private GestureLibrary gLib;
private static final String TAG = "com.GestureTestTwo";

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

     gLib = GestureLibraries.fromRawResource(this,R.raw.gestures);
     if (!gLib.load()) {
          Log.w(TAG, "could not load gesture library");
       finish();
}

    GestureOverlayView gestures = (GestureOverlayView) findViewById(R.id.gestures);
    gestures.addOnGesturePerformedListener(handleGestureListener);

}

/**
* our gesture listener
*/
private OnGesturePerformedListener handleGestureListener = new
OnGesturePerformedListener() {
@Override
public void onGesturePerformed(GestureOverlayView gestureView,
Gesture gesture) {
    ArrayList predictions = gLib.recognize(gesture);

     if (predictions.size() > 0) {
          Prediction prediction = predictions.get(0);
     if (prediction.score > 1.0) {
         Toast.makeText(GestureTestTwo.this, prediction.name,Toast.LENGTH_SHORT).show();
}
}
}
};
}

Make a folder named “raw” inside the “src” folder and drop the exported file into it.

After export the project will look like this

Main.xml for GestureTestTwo.java

<?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="Try to draw the gesture"
    />
<android.gesture.GestureOverlayView
    android:id="@+id/gestures"
    android:layout_width="fill_parent"
    android:layout_height="0dip"
    android:layout_weight="1.0" />
</LinearLayout>

Manifest file for GestureTestTwo.java

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.GestureTestTwo"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".GestureTestTwo"
                  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 draw same gestures that you saved in the previous project.

The above is the one that I draw and saved in the previous project in the gesture library inside the
SDCARD. However make your own and test it. Above you can see the outputs.
If the gestures you draw matches then a toast with the gesture name will be shown

Please leave your comments if you need more help.

In this post, we will have a list whose rows are made up of image, Here we just supply data to the adapter and helping the adapter to create a View objects for each row

The output will be

For this first create a xml file to hold the listview

<?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="@string/hello"
	    />
	    <ListView
			android:id="@android:id/list"
			android:layout_width="fill_parent"
			android:layout_height="fill_parent"/>

</LinearLayout>

The next objective is to create the xml for listview row. Here i create 2 components a imageview and a a textview for displaying the selected row. Also the image for the imageView is put in the drawable folder and is referred in this xml file.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent">
  <ImageView
		android:id="@+id/icon"
		android:layout_width="wrap_content"
		android:paddingLeft="4dip"
		android:paddingRight="4dip"
		android:layout_height="wrap_content"
		android:src="@drawable/icon"/>
	<TextView
		android:id="@+id/label"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:textSize="24sp"/>
</LinearLayout>

ok. Next create one main java file. Here instead of activity we extend the class ListActivity.That is shown below

package com.ImageListView.pack;
import android.app.ListActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;

public class ImageListView extends ListActivity
{
    /** Called when the activity is first created. */
	TextView selection;
	String[] names;
	public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

       names = new String[] { "sunday", "monday", "tuesday", "wednesday",
					"thrusday", "friday", "saturday",};

       this.setListAdapter(new ArrayAdapter<String>(this, R.layout.custom, R.id.label,names));
		selection=(TextView)findViewById(R.id.label);

	}

	public void onListItemClick(ListView parent, View v,int position,long id)
	{
	 	selection.setText(names[position]);
	}

}

The names array contains the elements that is to be displayed. The second parameter in the setlistAdapter is the name of the xml file we create for the row, the third is the imageView in the custom xml file and the last is the name of the array

Important
ListActivity has a default layout that consists of a single, full-screen list in the center of the screen.

However, if you desire, you can customize the screen layout by setting your own view layout with setContentView() in onCreate(). To do this, your own view MUST contain a ListView object with the id “@android:id/list”

What is context menu?
Where it is used?
How it is used?

I will cover all these questions…

Context Menu

A context menu is conceptually similar to the menu displayed when the user performs a “right-click” on a PC. You should use a context menu to provide the user access to actions that pertain to a specific item in the user interface. On Android, a context menu is displayed when the user performs a “long press” (press and hold) on an item.

By two ways we can enable Context menu from listView

First Create an xml to hold the ListView

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout android:id="@+id/widget32"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
 	<ListView android:id="@+id/listview"
		 android:scrollbars="vertical"
	 	 android:layout_width="fill_parent"
	 	 android:layout_height="fill_parent"
	 	 android:layout_gravity="fill_vertical"
	  	 android:layout_alignParentTop="true" >
	</ListView>
</RelativeLayout>

Now its time to create a simple listview in java.
Create a listView and set up a itemClicklistener

package com.coderzheaven.pack;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.View;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.View.OnCreateContextMenuListener;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.AdapterView.OnItemClickListener;

public class Listview extends Activity {
	 ListView list;
	    private List List_file;
	    public void onCreate(Bundle savedInstanceState)
	    {
	        super.onCreate(savedInstanceState);
	        setContentView(R.layout.main);
	        List_file =new ArrayList();
	        list = (ListView)findViewById(R.id.listview);
	 
	        CreateListView();
	    }
	    private void CreateListView()
	    {
	         List_file.add("bird");
	         List_file.add("cat");
	         List_file.add("dog");
	         List_file.add("tiger");
	         List_file.add("goat");
	         //Create an adapter for the listView and add the ArrayList to the adapter.
	         list.setAdapter(new ArrayAdapter(Listview.this, android.R.layout.simple_list_item_1,List_file));
	        // registerForContextMenu(list);
	 
	         list.setOnItemClickListener(new OnItemClickListener()
	         {
	                public void onItemClick(AdapterView arg0, View arg1,
	                        int arg2, long arg3)
	                {
	                }
	        });
	        
	    
	    list.setOnCreateContextMenuListener(new OnCreateContextMenuListener()
	    {
	       public void onCreateContextMenu(ContextMenu menu, View v,ContextMenuInfo menuInfo)
	       {
	           // TODO Auto-generated method stub
	            menu.setHeaderTitle("ContextMenu");
	            for (int i = 0; i < 5; i++)
	            {
	                menu.add(0, 0,0, "favorite"+i);
	            }
	       }
	   });
	}
}

The ContextMenu will appear when we long pres the listItem. We can enable this by two method

First Method

 list.setOnCreateContextMenuListener(new OnCreateContextMenuListener()
 {
	public void onCreateContextMenu(ContextMenu menu, View v,ContextMenuInfo menuInfo)
	{
		// TODO Auto-generated method stub
		 menu.setHeaderTitle("ContextMenu");
		 for (int i = 0; i<5; i++)
		 {
			 menu.add(0, 0,0, "favorite"+i);
		 }
	}
});

Second Method
Instead of setting up a listener we can register contextMenu from listView by

registerForContextMenu(list);

Then when the user selects an item from the context menu, the system calls onContextItemSelected(). Here is an example of how you can handle selected items

public void onCreateContextMenu(ContextMenu menu, View v,ContextMenuInfo menuInfo)
{
		menu.setHeaderTitle("ContextMenu");
	    for (int i = 0; i<5; i++)
	    {
	    	 menu.add(0, 0,0, "favorite"+i);
	    }
}