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POunfortunately application has stoppped when run in emulator
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  1. POunfortunately application has stoppped when run in emulator
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    copied!<p>I am absolute begginer in android devlopment and i want to make a camera On/Off application but i get error. so please help me.</p> <pre><code>package com.vikram.flashcamera; 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; public class MainActivity extends Activity { 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.activity_main); button = (Button) findViewById(R.id.buttonClick); Context context = this; PackageManager pm = context.getPackageManager(); if(!pm.hasSystemFeature(PackageManager.FEATURE_CAMERA)) { Log.e("err", "Device has no camera!"); return; } 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; } } }); } } </code></pre> <p>and my logCat error is given below.</p> <pre><code> 08-25 15:50:41.932: E/Trace(878): error opening trace file: No such file or directory (2) 08- 5 15:50:42.453: D/AndroidRuntime(878): Shutting down VM 08-25 15:50:42.463: W/dalvikvm(878): threadid=1: thread exiting with uncaught exception (group=0x40a13300) 08-25 15:50:42.473: E/AndroidRuntime(878): FATAL EXCEPTION: main 08-25 15:50:42.473: E/AndroidRuntime(878): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.vikram.flashcamera/com.vikram.flashcamera.MainActivity}: java.lang.NullPointerException 08-25 15:50:42.473: E/AndroidRuntime(878): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059) 08-25 15:50:42.473: E/AndroidRuntime(878): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) 08-25 15:50:42.473: E/AndroidRuntime(878): at android.app.ActivityThread.access$600(ActivityThread.java:130) 08-25 15:50:42.473: E/AndroidRuntime(878): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195) 08-25 15:50:42.473: E/AndroidRuntime(878): at android.os.Handler.dispatchMessage(Handler.java:99) 08-25 15:50:42.473: E/AndroidRuntime(878): at android.os.Looper.loop(Looper.java:137) 08-25 15:50:42.473: E/AndroidRuntime(878): at android.app.ActivityThread.main(ActivityThread.java:4745) 08-25 15:50:42.473: E/AndroidRuntime(878): at java.lang.reflect.Method.invokeNative(Native Method) 08-25 15:50:42.473: E/AndroidRuntime(878): at java.lang.reflect.Method.invoke(Method.java:511) 08-25 15:50:42.473: E/AndroidRuntime(878): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 08-25 15:50:42.473: E/AndroidRuntime(878): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 08-25 15:50:42.473: E/AndroidRuntime(878): at dalvik.system.NativeStart.main(Native Method) 08-25 15:50:42.473: E/AndroidRuntime(878): Caused by: java.lang.NullPointerException 08-25 15:50:42.473: E/AndroidRuntime(878): at com.vikram.flashcamera.MainActivity.onCreate(MainActivity.java:44) 08-25 15:50:42.473: E/AndroidRuntime(878): at android.app.Activity.performCreate(Activity.java:5008) 08-25 15:50:42.473: E/AndroidRuntime(878): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079) 08-25 15:50:42.473: E/AndroidRuntime(878): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023) 08-25 15:50:42.473: E/AndroidRuntime(878): ... 11 more 08-25 18:03:08.543: E/Trace(900): error opening trace file: No such file or directory (2) 08-25 18:03:09.122: D/AndroidRuntime(900): Shutting down VM 08-25 18:03:09.122: W/dalvikvm(900): threadid=1: thread exiting with uncaught exception (group=0x40a13300) 08-25 18:03:09.132: E/AndroidRuntime(900): FATAL EXCEPTION: main 08-25 18:03:09.132: E/AndroidRuntime(900): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.vikram.flashcamera/com.vikram.flashcamera.MainActivity}: java.lang.NullPointerException 08-25 18:03:09.132: E/AndroidRuntime(900): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059) 08-25 18:03:09.132: E/AndroidRuntime(900): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) 08-25 18:03:09.132: E/AndroidRuntime(900): at android.app.ActivityThread.access$600(ActivityThread.java:130) 08-25 18:03:09.132: E/AndroidRuntime(900): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195) 08-25 18:03:09.132: E/AndroidRuntime(900): at android.os.Handler.dispatchMessage(Handler.java:99) 08-25 18:03:09.132: E/AndroidRuntime(900): at android.os.Looper.loop(Looper.java:137) 08-25 18:03:09.132: E/AndroidRuntime(900): at android.app.ActivityThread.main(ActivityThread.java:4745) 08-25 18:03:09.132: E/AndroidRuntime(900): at java.lang.reflect.Method.invokeNative(Native Method) 08-25 18:03:09.132: E/AndroidRuntime(900): at java.lang.reflect.Method.invoke(Method.java:511) 08-25 18:03:09.132: E/AndroidRuntime(900): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 08-25 18:03:09.132: E/AndroidRuntime(900): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 08-25 18:03:09.132: E/AndroidRuntime(900): at dalvik.system.NativeStart.main(Native Method) 08-25 18:03:09.132: E/AndroidRuntime(900): Caused by: java.lang.NullPointerException 08-25 18:03:09.132: E/AndroidRuntime(900): at com.vikram.flashcamera.MainActivity.onCreate(MainActivity.java:44) 08-25 18:03:09.132: E/AndroidRuntime(900): at android.app.Activity.performCreate(Activity.java:5008) 08-25 18:03:09.132: E/AndroidRuntime(900): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079) 08-25 18:03:09.132: E/AndroidRuntime(900): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023) 08-25 18:03:09.132: E/AndroidRuntime(900): ... 11 more 08-25 18:03:11.613: I/Process(900): Sending signal. PID: 900 SIG: 9 08-25 18:33:52.222: E/Trace(929): error opening trace file: No such file or directory (2) 08-25 18:33:52.813: D/AndroidRuntime(929): Shutting down VM 08-25 18:33:52.813: W/dalvikvm(929): threadid=1: thread exiting with uncaught exception (group=0x40a13300) 08-25 18:33:52.833: E/AndroidRuntime(929): FATAL EXCEPTION: main 08-25 18:33:52.833: E/AndroidRuntime(929): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.vikram.flashcamera/com.vikram.flashcamera.MainActivity}: java.lang.NullPointerException 08-25 18:33:52.833: E/AndroidRuntime(929): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059) 08-25 18:33:52.833: E/AndroidRuntime(929): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) 08-25 18:33:52.833: E/AndroidRuntime(929): at android.app.ActivityThread.access$600(ActivityThread.java:130) 08-25 18:33:52.833: E/AndroidRuntime(929): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195) 08-25 18:33:52.833: E/AndroidRuntime(929): at android.os.Handler.dispatchMessage(Handler.java:99) 08-25 18:33:52.833: E/AndroidRuntime(929): at android.os.Looper.loop(Looper.java:137) 08-25 18:33:52.833: E/AndroidRuntime(929): at android.app.ActivityThread.main(ActivityThread.java:4745) 08-25 18:33:52.833: E/AndroidRuntime(929): at java.lang.reflect.Method.invokeNative(Native Method) 08-25 18:33:52.833: E/AndroidRuntime(929): at java.lang.reflect.Method.invoke(Method.java:511) 08-25 18:33:52.833: E/AndroidRuntime(929): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 08-25 18:33:52.833: E/AndroidRuntime(929): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 08-25 18:33:52.833: E/AndroidRuntime(929): at dalvik.system.NativeStart.main(Native Method) 08-25 18:33:52.833: E/AndroidRuntime(929): Caused by: java.lang.NullPointerException 08-25 18:33:52.833: E/AndroidRuntime(929): at com.vikram.flashcamera.MainActivity.onCreate(MainActivity.java:44) 08-25 18:33:52.833: E/AndroidRuntime(929): at android.app.Activity.performCreate(Activity.java:5008) 08-25 18:33:52.833: E/AndroidRuntime(929): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079) 08-25 18:33:52.833: E/AndroidRuntime(929): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023) 08-25 18:33:52.833: E/AndroidRuntime(929): ... 11 more 08-25 18:38:52.904: I/Process(929): Sending signal. PID: 929 SIG: 9 </code></pre>
 

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