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PONull Pointer Exception
 

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  1. PONull Pointer Exception
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    <p>I'm getting this NullPointerException for no reason. I am trying to send accelerometer 'x' value to MCU which is connected to my phone by bluetooth. Everything seems to be fine until it starts to send bytes. </p> <p>MainActivity.class:</p> <pre><code> private void getAccelerometer(SensorEvent event) { float[] values = event.values; // Movement float x = values[0]; float y = values[1]; float z = values[2]; // Convert float value to integer for progress bars because // they dont't support float value int mProgressStatus_x = (int)x; int mProgressStatus_y = (int)y; int mProgressStatus_z = (int)z; // Set converted x, y and z values to progress bars // Add to each progress bar value 10 because progress bar dosen't support negative value mProgressBar_x.setProgress(mProgressStatus_x + 10); mProgressBar_y.setProgress(mProgressStatus_y + 10); mProgressBar_z.setProgress(mProgressStatus_z + 10); mX = Float.toString(x); SendBytes(mX); } private void SendBytes (String mX) { if (mConnectionStatus == 1 &amp;&amp; mX != null) { // mX is the accelerometer value which is converted to the String byte[] out = mX.getBytes(); // mBluetoothService is BluetoothService.java mBluetoothService.write(out); // Line 150 } } </code></pre> <p>BluetoothService.class:</p> <pre><code> public synchronized void connected(BluetoothSocket socket, BluetoothDevice device) { // Cancel the thread that completed the connection if (mConnectThread != null) {mConnectThread.cancel(); mConnectThread = null; } // Cancel the ConnectedThread to make sure that it's not running currently connection if (mConnectedThread != null) {mConnectedThread.cancel(); mConnectedThread = null;} // Start the ConnectedThread to manage connection and perform transmission mConnectedThread = new ConnectedThread(socket); mConnectedThread.start(); // Send the name of the connected device back to the UI Activity Message msg = mHandler.obtainMessage(MainActivity.MESSAGE_DEVICE_NAME); Bundle bundle = new Bundle(); bundle.putString(MainActivity.DEVICE_NAME, device.getName()); msg.setData(bundle); mHandler.sendMessage(msg); // Set state of connection to STATE_CONNECTED setState(STATE_CONNECTED); mmConnectionStatus = 1; System.out.println("State connected"); } public void write(byte[] out) { ConnectedThread r; // Synchronize a copy of the ConnectedThread synchronized (this) { r = mConnectedThread; } if(out != null){ r.write(out); } // Line 133 } private class ConnectedThread extends Thread { private final BluetoothSocket mmSocket; private final InputStream mmInStream; private final OutputStream mmOutStream; // Thread for managing connection public ConnectedThread(BluetoothSocket socket) { System.out.println("ConnectedThread started"); mmSocket = socket; InputStream tmpIn = null; OutputStream tmpOut = null; try { // Get the input and output streams, using temp objects because // member streams are final tmpIn = socket.getInputStream(); tmpOut = socket.getOutputStream(); System.out.println("creating socket"); } catch (IOException e) { System.out.println("tmp socket not created"); } mmInStream = tmpIn; mmOutStream = tmpOut; } public void run() { System.out.println("ConnectedThread status" + mConnectedThread); // Buffer store for the stream byte[] buffer = new byte[1024]; // Bytes returned from the read() int bytesIn; // Keep listening until an occurs while(true) { try { bytesIn = mmInStream.read(buffer); } catch (IOException e) { break; } } } // Call this from the MainActivity to send data to the remote device public void write(byte[] bytes) { System.out.println(bytes); if(mState == STATE_CONNECTED &amp;&amp; bytes != null){ try { mmOutStream.write(bytes); mmOutStream.flush(); } catch (IOException e) { System.out.println("Exception during write" + e); } } } // Call this from the MainActivity to shutdown the connection public void cancel() { try { mmSocket.close(); } catch (IOException e) {} } } </code></pre> <p>Log:</p> <pre><code>12-12 03:22:59.228: D/libEGL(12554): loaded /vendor/lib/egl/libEGL_POWERVR_SGX540_120.so 12-12 03:22:59.228: D/libEGL(12554): loaded /vendor/lib/egl/libGLESv1_CM_POWERVR_SGX540_120.so 12-12 03:22:59.228: D/libEGL(12554): loaded /vendor/lib/egl/libGLESv2_POWERVR_SGX540_120.so 12-12 03:22:59.368: D/OpenGLRenderer(12554): Enabling debug mode 0 12-12 03:23:01.767: D/dalvikvm(12554): GC_CONCURRENT freed 111K, 2% free 9181K/9324K, paused 4ms+7ms, total 33ms 12-12 03:23:01.892: D/BluetoothAdapter(12554): enable(): BT is already enabled..! 12-12 03:23:08.509: I/System.out(12554): ConnectThread statusThread[Thread-919,5,main] 12-12 03:23:08.509: W/BluetoothAdapter(12554): getBluetoothService() called with no BluetoothManagerCallback 12-12 03:23:08.517: D/BluetoothSocket(12554): connect(), SocketState: INIT, mPfd: {ParcelFileDescriptor: FileDescriptor[46]} 12-12 03:23:09.017: E/ActivityThread(12554): Activity com.example.bluetoothc.settings has leaked IntentReceiver com.example.bluetoothc.settings$2@4151ecb8 that was originally registered here. Are you missing a call to unregisterReceiver()? 12-12 03:23:09.017: E/ActivityThread(12554): android.app.IntentReceiverLeaked: Activity com.example.bluetoothc.settings has leaked IntentReceiver com.example.bluetoothc.settings$2@4151ecb8 that was originally registered here. Are you missing a call to unregisterReceiver()? 12-12 03:23:09.017: E/ActivityThread(12554): at android.app.LoadedApk$ReceiverDispatcher.&lt;init&gt;(LoadedApk.java:795) 12-12 03:23:09.017: E/ActivityThread(12554): at android.app.LoadedApk.getReceiverDispatcher(LoadedApk.java:596) 12-12 03:23:09.017: E/ActivityThread(12554): at android.app.ContextImpl.registerReceiverInternal(ContextImpl.java:1316) 12-12 03:23:09.017: E/ActivityThread(12554): at android.app.ContextImpl.registerReceiver(ContextImpl.java:1296) 12-12 03:23:09.017: E/ActivityThread(12554): at android.app.ContextImpl.registerReceiver(ContextImpl.java:1290) 12-12 03:23:09.017: E/ActivityThread(12554): at android.content.ContextWrapper.registerReceiver(ContextWrapper.java:423) 12-12 03:23:09.017: E/ActivityThread(12554): at com.example.bluetoothc.settings.onCreate(settings.java:106) 12-12 03:23:09.017: E/ActivityThread(12554): at android.app.Activity.performCreate(Activity.java:5104) 12-12 03:23:09.017: E/ActivityThread(12554): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 12-12 03:23:09.017: E/ActivityThread(12554): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 12-12 03:23:09.017: E/ActivityThread(12554): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 12-12 03:23:09.017: E/ActivityThread(12554): at android.app.ActivityThread.access$600(ActivityThread.java:141) 12-12 03:23:09.017: E/ActivityThread(12554): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 12-12 03:23:09.017: E/ActivityThread(12554): at android.os.Handler.dispatchMessage(Handler.java:99) 12-12 03:23:09.017: E/ActivityThread(12554): at android.os.Looper.loop(Looper.java:137) 12-12 03:23:09.017: E/ActivityThread(12554): at android.app.ActivityThread.main(ActivityThread.java:5039) 12-12 03:23:09.017: E/ActivityThread(12554): at java.lang.reflect.Method.invokeNative(Native Method) 12-12 03:23:09.017: E/ActivityThread(12554): at java.lang.reflect.Method.invoke(Method.java:511) 12-12 03:23:09.017: E/ActivityThread(12554): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 12-12 03:23:09.017: E/ActivityThread(12554): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 12-12 03:23:09.017: E/ActivityThread(12554): at dalvik.system.NativeStart.main(Native Method) 12-12 03:23:09.814: I/System.out(12554): making connection to remote device 12-12 03:23:09.814: I/System.out(12554): ConnectedThread started 12-12 03:23:09.814: I/System.out(12554): creating socket 12-12 03:23:09.822: I/System.out(12554): ConnectedThread statusThread[Thread-920,5,main] 12-12 03:23:09.822: I/System.out(12554): State connected 12-12 03:23:09.837: I/System.out(12554): 1 12-12 03:23:09.876: D/AndroidRuntime(12554): Shutting down VM 12-12 03:23:09.876: W/dalvikvm(12554): threadid=1: thread exiting with uncaught exception (group=0x40c25930) 12-12 03:23:09.876: E/AndroidRuntime(12554): FATAL EXCEPTION: main 12-12 03:23:09.876: E/AndroidRuntime(12554): java.lang.NullPointerException 12-12 03:23:09.876: E/AndroidRuntime(12554): at com.example.bluetoothc.BluetoothService.write(BluetoothService.java:133) 12-12 03:23:09.876: E/AndroidRuntime(12554): at com.example.bluetoothc.MainActivity.SendBytes(MainActivity.java:150) 12-12 03:23:09.876: E/AndroidRuntime(12554): at com.example.bluetoothc.MainActivity.getAccelerometer(MainActivity.java:140) 12-12 03:23:09.876: E/AndroidRuntime(12554): at com.example.bluetoothc.MainActivity.onSensorChanged(MainActivity.java:111) 12-12 03:23:09.876: E/AndroidRuntime(12554): at android.hardware.SystemSensorManager$ListenerDelegate$1.handleMessage(SystemSensorManager.java:204) 12-12 03:23:09.876: E/AndroidRuntime(12554): at android.os.Handler.dispatchMessage(Handler.java:99) 12-12 03:23:09.876: E/AndroidRuntime(12554): at android.os.Looper.loop(Looper.java:137) 12-12 03:23:09.876: E/AndroidRuntime(12554): at android.app.ActivityThread.main(ActivityThread.java:5039) 12-12 03:23:09.876: E/AndroidRuntime(12554): at java.lang.reflect.Method.invokeNative(Native Method) 12-12 03:23:09.876: E/AndroidRuntime(12554): at java.lang.reflect.Method.invoke(Method.java:511) 12-12 03:23:09.876: E/AndroidRuntime(12554): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 12-12 03:23:09.876: E/AndroidRuntime(12554): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 12-12 03:23:09.876: E/AndroidRuntime(12554): at dalvik.system.NativeStart.main(Native Method) 12-12 03:23:13.884: I/Process(12554): Sending signal. PID: 12554 SIG: 9 </code></pre>
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    1. This table or related slice is empty.
    1. PTQuestion
    1. USphi
    1. USuser1888162
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
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      1. PONull Pointer Exception
      1. This table or related slice is empty.
      1. VTDownMod
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    1. COis mmOutStream!=null when used?
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      1. USblindstuff
    2. CO`java.lang.NullPointerException at BluetoothService.java:133`, it appears quite eloquent to me.
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      1. USignis
    3. COHilarious title!
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      1. USjahroy
 

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