Android flashlight demo and androiddemo

Android flashlight demo and androiddemo

Package com. sphere. flashlight; import android. app. activity; import android. app. alertDialog; import android. content. dialogInterface; import android. content. pm. featureInfo; import android. content. pm. packageManager; import android. hardware. camera; import android. OS. bundle; import android. view. keyEvent; import android. widget. compoundButton; import android. widget. compoundButton. onCheckedChangeListener; import android Oid. widget. toast; import android. widget. toggleButton; public class MainActivity extends Activity {private ToggleButton button; private Camera camera; @ Override protected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. main); button = (ToggleButton) findViewById (R. id. lightButton); button. setOnCheckedChangeListener (new OnCheckedChangeListener (){ @ Override public void onCheckedChanged (CompoundButton button, boolean checked) {if (checked) {tryOPenLight () ;}else {tryClosedLight () ;}});} private void tryOPenLight () {PackageManager pm = this. getPackageManager (); FeatureInfo [] features = pm. getSystemAvailableFeatures (); for (FeatureInfo f: features) {if (PackageManager. FEATURE_CAMERA_FLASH.equals (f. name) // determine whether the device supports the flashlight {if (null = camera) {Camera = Camera. open ();} Camera. parameters parameters = camera. getParameters (); parameters. setFlashMode (Camera. parameters. FLASH_MODE_TORCH); camera. setParameters (parameters); camera. startPreview () ;}} if (! Pm. hasSystemFeature (PackageManager. FEATURE_CAMERA_FLASH) {button. setChecked (false); Toast. makeText (getBaseContext (), "Sorry. you phone not support flashlight ", Toast. LENGTH_SHORT ). show () ;}} private void tryClosedLight () {if (camera! = Null) {camera. stopPreview (); camera. release (); camera = null ;}@ Override public boolean onKeyDown (int keyCode, KeyEvent event) {switch (keyCode) {case KeyEvent. KEYCODE_BACK: AlertDialog. builder build = new AlertDialog. builder (this); build. setTitle ("Exit program "). setMessage ("are you sure you want to exit the flashlight * ^_^ *"). setPositiveButton ("OK", new DialogInterface. onClickListener () {@ Override public void onClick (DialogInterface dialog, int which) {tryClosedLight (); finish ();}}). setNegativeButton ("cancel", new DialogInterface. onClickListener () {@ Override public void onClick (DialogInterface dialog, int which) {// TODO Auto-generated method stub }}). show (); break;} return super. onKeyDown (keyCode, event) ;}@ Override protected void onDestroy () {tryClosedLight (); super. onDestroy ();}}

 

AndroidManifest. xml

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.sphere.flashlight"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="8"        android:targetSdkVersion="18" />    <uses-permission android:name="android.permission.FLASHLIGHT"/>    <uses-permission android:name="android.permission.WAKE_LOCK"/>    <uses-permission android:name="android.permission.CAMERA"/>    <uses-permission android:name="android.hardware.camera"/>    <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name="com.sphere.flashlight.MainActivity"            android:screenOrientation="portrait"            android:theme="@android:style/Theme.NoTitleBar.Fullscreen"            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>