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POUsing Proximity Sensor in Android 4.3
 

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  1. POUsing Proximity Sensor in Android 4.3
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    <p>I was working on proximity sensor in S4. After update to 4.3 my application started getting crashed.</p> <p>Here is the code Sample :</p> <p>This method is written in a service class</p> <pre><code>public void playSong(int songIndex) { // Play song try { Log.d("Debug","playSong 1"); mp.reset(); Log.d("Debug","playSong 2"); mp.setDataSource(songsListingSD.get(songIndex).get("songPath")); Log.d("Debug","playSong 3"); mp.prepare(); Log.d("Debug","playSong 4"); mp.start(); // Displaying Song title Log.d("Debug","playSong 5"); String songTitle = songsListingSD.get(songIndex).get("songTitle"); Log.d("Debug","playSong songTitle = " + songTitle); Log.d("Debug","playSong 6"); songTitleLabel.get().setText(songTitle); Log.d("Debug","playSong 7"); // Changing Button Image to pause image btnPlay.get().setImageResource(R.drawable.ic_media_pause); // :351 Log.d("Debug","playSong 8"); // set Progress bar values songProgressBar.get().setProgress(0); songProgressBar.get().setMax(100); // Updating progress bar updateProgressBar(); } catch (IllegalArgumentException e) { e.printStackTrace(); } catch (IllegalStateException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } </code></pre> <p>I have implemented the service class with SensorEventListener interface and implemented the abstract method.</p> <p>Here is the code :</p> <pre><code> public void onSensorChanged(SensorEvent event) { // TODO Auto-generated method stub Log.d("Player Service", "service called for sensor event, Next called1"); try{ Log.d("Debug"," check Here"); Random rand = new Random(); Log.d("Debug","sensor method 1"); currentSongIndex = rand . nextInt((songsListingSD.size() - 1) - 0 + 1) + 0; Log.d("Debug","sensor method 2"); Log.d("Debug"," Cur Index = " + currentSongIndex); playSong(currentSongIndex); Log.d("Debug","sensor method 3"); } catch(Exception e){e.printStackTrace();} } public void onAccuracyChanged(Sensor sensor, int accuracy) { } </code></pre> <p>This is the stack Trace : </p> <pre><code>10-29 01:09:29.546: D/Player Service(19444): service called for sensor event, Next called1 10-29 01:09:29.546: D/Debug(19444): check Here 10-29 01:09:29.546: D/Debug(19444): sensor method 1 10-29 01:09:29.546: D/Debug(19444): sensor method 2 10-29 01:09:29.546: D/Debug(19444): Cur Index = 2 10-29 01:09:29.546: D/Debug(19444): playSong 1 10-29 01:09:29.546: D/Debug(19444): playSong 2 10-29 01:09:29.576: D/Debug(19444): playSong 3 10-29 01:09:29.585: D/Debug(19444): playSong 4 10-29 01:09:29.596: D/Debug(19444): playSong 5 10-29 01:09:29.596: D/Debug(19444): playSong songTitle = [SongsPK.info] Aashiqui 2 - 01 - Tum Hi Ho 10-29 01:09:29.596: D/Debug(19444): playSong 6 10-29 01:09:29.596: W/System.err(19444): java.lang.NullPointerException 10-29 01:09:29.596: W/System.err(19444): at com.example.audionplayerinservice.PlayerService.playSong(PlayerService.java:351) 10-29 01:09:29.606: W/System.err(19444): at com.example.audionplayerinservice.PlayerService.onSensorChanged(PlayerService.java:589) 10-29 01:09:29.606: W/System.err(19444): at android.hardware.SystemSensorManager$SensorEventQueue.dispatchSensorEvent(SystemSensorManager.java:371) 10-29 01:09:29.606: W/System.err(19444): at android.os.MessageQueue.nativePollOnce(Native Method) 10-29 01:09:29.606: W/System.err(19444): at android.os.MessageQueue.next(MessageQueue.java:132) 10-29 01:09:29.606: W/System.err(19444): at android.os.Looper.loop(Looper.java:124) 10-29 01:09:29.606: W/System.err(19444): at android.app.ActivityThread.main(ActivityThread.java:5103) 10-29 01:09:29.606: W/System.err(19444): at java.lang.reflect.Method.invokeNative(Native Method) 10-29 01:09:29.606: W/System.err(19444): at java.lang.reflect.Method.invoke(Method.java:525) 10-29 01:09:29.606: W/System.err(19444): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 10-29 01:09:29.606: W/System.err(19444): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 10-29 01:09:29.616: W/System.err(19444): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>Code to register the proximity listener : </p> <pre><code> private WeakReference&lt;ImageView&gt; btnPlay private WeakReference&lt;TextView&gt; songTitleLabel; private SensorManager mSensorManager; private Sensor mSensor; mSensorManager = (SensorManager)getSystemService(SENSOR_SERVICE); mSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_PROXIMITY); mSensorManager.registerListener(this, mSensor,SensorManager.SENSOR_DELAY_NORMAL ); </code></pre> <p>I am testing this in emulator 4.3 (Android) . If I comment the sensor part then the app is working. Please help me in debugging as I don't able to find any error. Thanks in Advance </p>
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    1. PTQuestion
    1. USJeet
    1. USJeet
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    1. This table or related slice is empty.
    1. COwhat is btnPlay variable?
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      1. POUsing Proximity Sensor in Android 4.3
      1. USGopal Gopi
    2. COweakRef of imageview, image is there and I said same code is working if I just disable the Sensor part
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      1. POUsing Proximity Sensor in Android 4.3
      1. USJeet
    3. COi think its not sensor related problem as the exception is at the playSong function.
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      1. POUsing Proximity Sensor in Android 4.3
      1. USAli Imran
 

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