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POMy application crashes when i touch the screen - OnTouch method fails
 

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  1. POMy application crashes when i touch the screen - OnTouch method fails
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    <p>I have created an application where i have a camera preview. I am trying to create a touch event such that when i touch the preview, something will happen (let say, a toast will appear). The problem is that when i am touching the preview, after 2 seconds the application crashes. I have two classes:</p> <p>CameraActivity:</p> <pre><code>public class CameraActivity extends Activity { private static final String TAG = "CameraDemo"; Preview preview; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); preview = new Preview(this); ((FrameLayout) findViewById(R.id.preview)).addView(preview); ((FrameLayout) findViewById(R.id.preview)).setOnTouchListener(preview); Log.d(TAG, "Camera Activity Created."); } } </code></pre> <p>and Preview:</p> <pre><code>class Preview extends SurfaceView implements SurfaceHolder.Callback, OnTouchListener { private static final String TAG = "Preview"; SurfaceHolder mHolder; public Camera camera; Preview(Context context) { super(context); // Install a SurfaceHolder.Callback so we get notified when the // underlying surface is created and destroyed. mHolder = getHolder(); mHolder.addCallback(this); mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); } // Called once the holder is ready public void surfaceCreated(SurfaceHolder holder) { camera = Camera.open(); try { camera.setDisplayOrientation(90); camera.setPreviewDisplay(holder); camera.setPreviewCallback(new PreviewCallback() { // Called for each frame previewed public void onPreviewFrame(byte[] data, Camera camera) { Log.d(TAG, "onPreviewFrame called at: " + System.currentTimeMillis()); Preview.this.invalidate(); } }); } catch (IOException e) { e.printStackTrace(); } } // Called when the holder is destroyed public void surfaceDestroyed(SurfaceHolder holder) { camera.stopPreview(); camera.release(); camera = null; } // Called when holder has changed public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) { camera.startPreview(); } public boolean onTouch(View v, MotionEvent event) { Toast.makeText(findViewById(R.id.preview).getContext(), "BEFORE SHUTTER", Toast.LENGTH_LONG).show(); return false; } } </code></pre> <p>Can someone please help and tell me what i am doing wrong?</p> <p>Here is the LogCat (the part where the crash appears):</p> <pre><code>03-08 12:11:48.335: D/AndroidRuntime(1167): Shutting down VM 03-08 12:11:48.335: W/dalvikvm(1167): threadid=1: thread exiting with uncaught exception (group=0x40015578) 03-08 12:11:48.343: E/AndroidRuntime(1167): FATAL EXCEPTION: main 03-08 12:11:48.343: E/AndroidRuntime(1167): java.lang.NullPointerException 03-08 12:11:48.343: E/AndroidRuntime(1167): at com.marakana.Preview.onTouch(Preview.java:80) 03-08 12:11:48.343: E/AndroidRuntime(1167): at android.view.View.dispatchTouchEvent(View.java:3934) 03-08 12:11:48.343: E/AndroidRuntime(1167): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:903) 03-08 12:11:48.343: E/AndroidRuntime(1167): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869) 03-08 12:11:48.343: E/AndroidRuntime(1167): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869) 03-08 12:11:48.343: E/AndroidRuntime(1167): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869) 03-08 12:11:48.343: E/AndroidRuntime(1167): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869) 03-08 12:11:48.343: E/AndroidRuntime(1167): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1733) 03-08 12:11:48.343: E/AndroidRuntime(1167): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1151) 03-08 12:11:48.343: E/AndroidRuntime(1167): at android.app.Activity.dispatchTouchEvent(Activity.java:2096) 03-08 12:11:48.343: E/AndroidRuntime(1167): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1717) 03-08 12:11:48.343: E/AndroidRuntime(1167): at android.view.ViewRoot.deliverPointerEvent(ViewRoot.java:2215) 03-08 12:11:48.343: E/AndroidRuntime(1167): at android.view.ViewRoot.handleMessage(ViewRoot.java:1886) 03-08 12:11:48.343: E/AndroidRuntime(1167): at android.os.Handler.dispatchMessage(Handler.java:99) 03-08 12:11:48.343: E/AndroidRuntime(1167): at android.os.Looper.loop(Looper.java:123) 03-08 12:11:48.343: E/AndroidRuntime(1167): at android.app.ActivityThread.main(ActivityThread.java:3687) 03-08 12:11:48.343: E/AndroidRuntime(1167): at java.lang.reflect.Method.invokeNative(Native Method) 03-08 12:11:48.343: E/AndroidRuntime(1167): at java.lang.reflect.Method.invoke(Method.java:507) 03-08 12:11:48.343: E/AndroidRuntime(1167): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842) 03-08 12:11:48.343: E/AndroidRuntime(1167): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600) 03-08 12:11:48.343: E/AndroidRuntime(1167): at dalvik.system.NativeStart.main(Native Method) 03-08 12:11:48.378: D/dalvikvm(1167): GC_FOR_MALLOC freed 943K, 59% free 2633K/6407K, external 1596K/2108K, paused 15ms 03-08 12:11:48.531: D/dalvikvm(1167): GC_CONCURRENT freed 21K, 52% free 3084K/6407K, external 1596K/2108K, paused 2ms+26ms 03-08 12:11:56.109: I/Process(1167): Sending signal. PID: 1167 SIG: 9 </code></pre> <p>Thanks</p>
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    1. USEyal
    1. USEyal
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    1. COplease send the logcat details
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      1. POMy application crashes when i touch the screen - OnTouch method fails
      1. USNishant
    2. COA first thing you should do to find the bug in your code is to take a look at the logcat.
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      1. POMy application crashes when i touch the screen - OnTouch method fails
      1. USEgor
    3. COThaks for responding! i have attached the LogCat to the original post
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      1. POMy application crashes when i touch the screen - OnTouch method fails
      1. USEyal
 

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