A Simple FlashLight Application.

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

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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.

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<?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.

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<?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>