CoderzHeaven

Here is a simple Application on how to use flashlight in android.

package com.coderzheaven.pack;

import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageManager;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class FlashLightActivity extends Activity {

	//flag to detect flash is on or off
	private boolean isLighOn = false;

	private Camera camera;

	private Button button;

	@Override
	protected void onStop() {
		super.onStop();

		if (camera != null) {
			camera.release();
		}
	}

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

		button = (Button) findViewById(R.id.buttonFlashlight);

		Context context = this;
		PackageManager pm = context.getPackageManager();

		// if device support camera?
		if (!pm.hasSystemFeature(PackageManager.FEATURE_CAMERA)) {
			Log.e("err", "Device has no camera!");
			return;
		}
		try{
			camera = Camera.open();
			final Parameters p = camera.getParameters();
	
			button.setOnClickListener(new OnClickListener() {
	
				@Override
				public void onClick(View arg0) {
	
					if (isLighOn) {
	
						Log.i("info", "torch is turn off!");
	
						p.setFlashMode(Parameters.FLASH_MODE_OFF);
						camera.setParameters(p);
						camera.stopPreview();
						isLighOn = false;
	
					} else {
	
						Log.i("info", "torch is turn on!");
	
						p.setFlashMode(Parameters.FLASH_MODE_TORCH);
	
						camera.setParameters(p);
						camera.startPreview();
						isLighOn = true;
	
					}
	
				}
			});
		}catch(Exception e){
			Toast.makeText(this, "Your device doesnot have FlashLight capability", Toast.LENGTH_LONG).show();
		}

	}
}

Now the layout file main.xml.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/relativeLayout1"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <Button
        android:id="@+id/buttonFlashlight"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
       	android:layout_centerVertical="true"
       	android:layout_centerHorizontal="true"
        android:text="Torch" />

</RelativeLayout>

AndroiManifest.xml file contents.

Make sure to add the permissions.

<?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" >

    <uses-sdk android:minSdkVersion="5" />

    <uses-permission android:name="android.permission.CAMERA" />
    <uses-feature android:name="android.hardware.camera" />

    <application
        android:debuggable="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:label="@string/app_name"
            android:name=".FlashLightActivity" >
            <intent-filter >
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Download the android java source code from here.

please leave your valuable comments on this post.

Hello everyone,

Today’s example shows how to create a custom layout for your camera preview, that is if you want a custom layout while your camera is opening.
This example helps you to achieve this.

First create a fresh project and name it CameraCustomLayout and copy this code to CameraCustomLayout.java file.

package com.coderzheaven.pack;

import java.io.IOException;
import android.app.Activity;
import android.content.pm.ActivityInfo;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.ViewGroup.LayoutParams;

public class CustomCameraActivity extends Activity implements SurfaceHolder.Callback {

	Camera camera;
	SurfaceView surfaceView;
	SurfaceHolder surfaceHolder;
	boolean previewing = false;
	LayoutInflater controlInflater = null;

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

        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

        getWindow().setFormat(PixelFormat.UNKNOWN);
        surfaceView = (SurfaceView)findViewById(R.id.camerapreview);
        surfaceHolder = surfaceView.getHolder();
        surfaceHolder.addCallback(this);
        surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

        controlInflater = LayoutInflater.from(getBaseContext());
        View viewControl = controlInflater.inflate(R.layout.custom, null);
        LayoutParams layoutParamsControl = new LayoutParams(LayoutParams.FILL_PARENT,
        								   					LayoutParams.FILL_PARENT);
        this.addContentView(viewControl, layoutParamsControl);
    }

	@Override
	public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
		if(previewing){
			camera.stopPreview();
			previewing = false;
		}

		if (camera != null){
			try {
				camera.setPreviewDisplay(surfaceHolder);
				camera.startPreview();
				previewing = true;
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

	@Override
	public void surfaceCreated(SurfaceHolder holder) {
		camera = Camera.open();
	}

	@Override
	public void surfaceDestroyed(SurfaceHolder holder) {
		camera.stopPreview();
		camera.release();
		camera = null;
		previewing = false;
	}
}

After that create an xml file named custom.xml inside the res/layout folder and copy this code into it.
This is the layout which comes when you open the camera in your device.

<?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"
    android:gravity="left">

	<Button
		android:text="Click Me"
		android:id="@+id/Button01"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content">
	</Button>
	<Button
		android:text="Click Me too"
		android:id="@+id/Button02"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content">
	</Button>
</LinearLayout>

Now in the main.xml file copy this code.
This file contains the SurfaceView which holds the cameraPreview.

<?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"
    >
<SurfaceView
	android:id="@+id/camerapreview"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    />
</LinearLayout>

Now you are done.
Note : Please run it on a real device, because camera will not work on the emulator.

You can download the source code from here.
PLease dont forget to comment on this post if you like it.