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.
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