Apps Help App Crashes - Android Open Accessory Application

[vinayvl]

Hi,

I am working on a adding new messages to the already existing code base.
The android device basically gets updated readings from the sensors on a development board through USB.

The handler for the receiver thread calls an update function to get the new value:

public String getValue(int capId) {
		String val = "";
		int v = values.get(Integer.valueOf(capId));
		
		switch (capId) {
		case Node.DEV_TEMP:
			val = Double.toString( ((double)v)/100 );
			break;
		case Node.DEV_LIGHT:
			val = Integer.toString(v);
			break;
		case Node.DEV_BTN:
			val = Integer.toString(v);
			break;	
		case Node.DEV_ACCL_X:
			val = Integer.toString(v);
			break;
		
		}
		
		return val;
	}

The DEV_ACCL_X is the new message that I am trying to add. According to the LogCat, this message is being received by the app, just before it crashes.

I/EA AOA (30663): Recv Node id=144, CapId= 96, data=233 -- corresponds to the new message.

/UsbDeviceManager(  163): entering USB accessory mode: UsbAccessory[mManufacturer=Embedded Artists AB, mModel=AOA Board - Nodes, mDescription=Demo - AOA Nodes, mVersion=1.0, mUri=http://www.embeddedartists.com/_aoa/Demo_AOA_Nodes.apk, mSerial=N/A]

I/ActivityManager(  163): START {flg=0x10000000 cmp=com.android.systemui/.usb.UsbConfirmActivity (has extras)} from pid 163

I/ActivityManager(  163): Displayed com.android.systemui/.usb.UsbConfirmActivity: +71ms

I/ActivityManager(  163): START {act=android.hardware.usb.action.USB_ACCESSORY_ATTACHED flg=0x10000000 cmp=com.embeddedartists.aoa.nodes/.MainActivity (has extras)} from pid 315

I/EA AOA CAN(30663): onResume

I/EA AOA  (30663): Receiver.run

I/EA AOA  (30663): Recv Node Add: id=144, capLen=7

I/EA AOA  (30663): Recv Node id=144, CapId= 16, data=2650

I/ActivityManager(  163): Displayed com.embeddedartists.aoa.nodes/.MainActivity: +97ms

D/OpenGLRenderer(  315): Flushing caches (mode 0)

I/EA AOA  (30663): Recv Node id=144, CapId= 32, data=227

I/EA AOA  (30663): Recv Node id=144, CapId= 48, data=0

D/OpenGLRenderer(  315): Flushing caches (mode 1)

I/EA AOA  (30663): Recv Node id=144, CapId= 32, data=245

I/EA AOA  (30663): Recv Node id=144, CapId= 96, data=245

D/AndroidRuntime(30663): Shutting down VM

W/dalvikvm(30663): threadid=1: thread exiting with uncaught exception (group=0x40a471f8)

E/AndroidRuntime(30663): FATAL EXCEPTION: main

E/AndroidRuntime(30663): java.lang.NullPointerException

E/AndroidRuntime(30663): 	at com.embeddedartists.aoa.nodes.NodeView$1.handleMessage(NodeView.java:171)

E/AndroidRuntime(30663): 	at android.os.Handler.dispatchMessage(Handler.java:99)

E/AndroidRuntime(30663): 	at android.os.Looper.loop(Looper.java:137)

E/AndroidRuntime(30663): 	at android.app.ActivityThread.main(ActivityThread.java:4424)

E/AndroidRuntime(30663): 	at java.lang.reflect.Method.invokeNative(Native Method)

E/AndroidRuntime(30663): 	at java.lang.reflect.Method.invoke(Method.java:511)

E/AndroidRuntime(30663): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)

E/AndroidRuntime(30663): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)

E/AndroidRuntime(30663): 	at dalvik.system.NativeStart.main(Native Method)

W/ActivityManager(  163):   Force finishing activity com.embeddedartists.aoa.nodes/.MainActivity

D/dalvikvm(  163): GC_FOR_ALLOC freed 401K, 24% free 12582K/16391K, paused 54ms

W/ActivityManager(  163): Activity pause timeout for ActivityRecord{4134eaf0 com.embeddedartists.aoa.nodes/.MainActivity}

I/EA AOA  (30663): Recv Node id=144, CapId= 32, data=222

I/EA AOA  (30663): Recv Node id=144, CapId= 96, data=222

I/EA AOA  (30663): Recv Node id=144, CapId= 32, data=233

I/EA AOA  (30663): Recv Node id=144, CapId= 96, data=233

I/Process (30663): Sending signal. PID: 30663 SIG: 9

W/InputDispatcher(  163): channel '41356ab0 com.embeddedartists.aoa.nodes/com.embeddedartists.aoa.nodes.MainActivity (server)' ~ Consumer closed input channel or an error occurred.  events=0x8

E/InputDispatcher(  163): channel '41356ab0 com.embeddedartists.aoa.nodes/com.embeddedartists.aoa.nodes.MainActivity (server)' ~ Channel is unrecoverably broken and will be disposed!

W/InputDispatcher(  163): Attempted to unregister already unregistered input channel '41356ab0 com.embeddedartists.aoa.nodes/com.embeddedartists.aoa.nodes.MainActivity (server)'

I/ActivityManager(  163): Process com.embeddedartists.aoa.nodes (pid 30663) has died.

I/WindowManager(  163): WIN DEATH: Window{410e8e00 com.embeddedartists.aoa.nodes/com.embeddedartists.aoa.nodes.MainActivity paused=false}

W/ActivityManager(  163): Force removing ActivityRecord{4109b628 com.embeddedartists.aoa.nodes/.MainActivity}: app died, no saved state

I/WindowManager(  163): WIN DEATH: Window{41356ab0 com.embeddedartists.aoa.nodes/com.embeddedartists.aoa.nodes.MainActivity paused=false}

I/WindowManager(  163): WINDOW DIED Window{41356ab0 com.embeddedartists.aoa.nodes/com.embeddedartists.aoa.nodes.MainActivity paused=false}

W/InputManagerService(  163): Got RemoteException sending setActive(false) notification to pid 30663 uid 10012

D/UsbDeviceManager(  163): exited USB accessory mode

D/MtpService(25247): addStorageLocked 65537 /mnt/sdcard

D/MtpService(25247): starting MTP server in MTP mode

D/MtpService(25247): addStorageLocked 65537 /mnt/sdcard

D/dalvikvm(  315): GC_CONCURRENT freed 332K, 58% free 8215K/19271K, paused 6ms+5ms

Any inputs on why the app is crashing and how to rectify will be really helpful. I am an embedded programmer and an amateur in Java.

Thanks in advance!