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POFlashlight doesn't turn off when I press back button
 

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    <p>I have created a flashlight application...Everything is working fine...except that whenever the flashlight is on and i press the back button...it remains on...and doesn't stop...What to do?..I have used the onpause method but it doesn't seem to work...</p> <p>Also, I would be really grateful if someone could explain me the use of parameters. I have taken help from an online source for this program. I didnt understand the parameters method...Can someone explain it in detail? Thanks In Advance....:)</p> <p>My XML:</p> <pre><code> &lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/RelativeLayout1" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:background="@drawable/aaaaaaa" tools:context=".Flash" &gt; &lt;ImageButton android:id="@+id/ib2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:layout_centerVertical="true" android:src="@drawable/ic_launcher" /&gt;&lt;/RelativeLayout&gt; </code></pre> <p>My Flash.java:</p> <pre><code> package com.potapptoes.flashlight; import android.os.Bundle; import android.os.PowerManager; import android.os.PowerManager.WakeLock; import android.app.Activity; import android.content.Context; import android.hardware.Camera; import android.hardware.Camera.Parameters; import android.view.View; import android.view.View.OnClickListener; import android.view.Window; import android.view.WindowManager; import android.widget.ImageButton; public class Flash extends Activity implements OnClickListener { Camera cam = null; ImageButton ib1; Parameters para; PowerManager pm; WakeLock wl; @Override protected void onCreate(Bundle savedInstanceState) { requestWindowFeature(Window.FEATURE_NO_TITLE); getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); pm = (PowerManager) getSystemService(Context.POWER_SERVICE); wl = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK, "whatever"); super.onCreate(savedInstanceState); setContentView(R.layout.main); wl.acquire(); initialize(); ib1.setOnClickListener(this); } private void initialize() { // TODO Auto-generated method stub ib1 = (ImageButton) findViewById(R.id.ib2); } @Override public void onClick(View v) { // TODO Auto-generated method stub if (cam == null) { cam = Camera.open(); para = cam.getParameters(); para.setFlashMode(Parameters.FLASH_MODE_TORCH); cam.setParameters(para); } else { para.setFlashMode(Parameters.FLASH_MODE_OFF); cam.setParameters(para); cam.release(); cam = null; } } @Override protected void onPause() { // TODO Auto-generated method stub super.onPause(); wl.release(); finish(); } } </code></pre> <p>Manifest:</p> <pre><code> &lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.potapptoes.flashlight" android:versionCode="1" android:versionName="1.0" &gt; &lt;uses-sdk android:minSdkVersion="8" android:targetSdkVersion="16" /&gt; &lt;uses-permission android:name="android.permission.CAMERA"/&gt; &lt;uses-permission android:name="android.permission.WAKE_LOCK"/&gt; &lt;application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" &gt; &lt;activity android:name="com.potapptoes.flashlight.Flash" android:label="@string/app_name" &gt; &lt;intent-filter&gt; &lt;action android:name="android.intent.action.MAIN" /&gt; &lt;category android:name="android.intent.category.LAUNCHER" /&gt; &lt;/intent-filter&gt; &lt;/activity&gt; &lt;/application&gt; </code></pre> <p></p>
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