[Q] Threads exits with uncaught exception topic

Hi, Dear XDA-developers,

Recently, I tried to build an blue tooth app. I wanted to display the data in the screen when all data arrived. I used the following code to do that job. However, the looping between Broadcaster receiver and Handler message could not be linked together smoothly. Usually, after one data displayed, I got an error with the following logs

02-03 05:01:30.931: W/dalvikvm(3419): threadid=11: thread exiting with uncaught exception (group=0x40018560)
02-03 05:01:37.827: E/AndroidRuntime(3419): FATAL EXCEPTION: Thread-13
02-03 05:01:37.827: E/AndroidRuntime(3419): java.lang.NullPointerException
02-03 05:01:37.827: E/AndroidRuntime(3419): at com.huasu.healthmonitor3.Device_Activity.run(D evice_Activity.java:325)
02-03 05:01:37.827: E/AndroidRuntime(3419): at java.lang.Thread.run(Thread.java:1019)

the code snippet is as followings, any suggestions are appreciated!

public final Handler mHandler = new Handler() {
@override
public void handleMessage(Message msg) {
switch (msg.what) {
case Common.MESSAGE_CONNECT:
new Thread(new Runnable() {
public void run() {
InputStream tmpIn;
OutputStream tmpOut;
try {
UUID uuid = UUID.fromString(SPP_UUID);
BluetoothDevice btDev = btAdapt
.getRemoteDevice(strAddress);
btSocket = btDev
.createRfcommSocketToServiceRecord(uuid);
btSocket.connect();
tmpIn = btSocket.getInputStream();
tmpOut = btSocket.getOutputStream();
} catch (Exception e) {
Log.d(Common.TAG, "Error connected to: "
+ strAddress);
bConnect = false;
mmInStream = null;
mmOutStream = null;
btSocket = null;
e.printStackTrace();
mHandler.sendEmptyMessage(Common.MESSAGE_CONNECT_L OST);
return;
}
mmInStream = tmpIn;
mmOutStream = tmpOut;
mHandler.sendEmptyMessage(Common.MESSAGE_CONNECT_S UCCEED);
}

}).start();
break;
case Common.MESSAGE_CONNECT_SUCCEED:
bConnect = true;
new Thread(new Runnable() {
public void run() {
// First write command to the bluetooth port
try{
mmOutStream.write(comm1);
}
catch (Exception e) {
Log.d(Common.TAG, "Error in writing command to bluetooth ");
}

int nRecv = 0;
while (bConnect) {
try {
Log.e(Common.TAG, "Start Recv" + String.valueOf(mmInStream.available()));
nRecv = mmInStream.read(bufRecv);
if (nRecv < 1) {
Log.e(Common.TAG, "Recving Short");
Thread.sleep(100);
continue;
}
System.arraycopy(bufRecv, 0, bRecv, nRecved, nRecv);
Log.e(Common.TAG, "Recv:" + String.valueOf(nRecv));
nRecved += nRecv;
if(nRecved < nNeed)
{
Thread.sleep(1000);
continue;
}

//sendBroadcast(intent);
mHandler.obtainMessage(Common.MESSAGE_RECV,nNeed, -1, null).sendToTarget();


} catch (Exception e) {
Log.e(Common.TAG, "Recv thread:" + e.getMessage());
mHandler.sendEmptyMessage(Common.MESSAGE_EXCEPTION _RECV);
break;
}
}
Log.e(Common.TAG, "Exit while");
}
}).start();
break;
case Common.MESSAGE_EXCEPTION_RECV:
case Common.MESSAGE_CONNECT_LOST:
try {
if (mmInStream != null)
mmInStream.close();
if (mmOutStream != null)
mmOutStream.close();
if (btSocket != null)
btSocket.close();
} catch (IOException e) {
Log.e(Common.TAG, "Close Error");
e.printStackTrace();
} finally {
mmInStream = null;
mmOutStream = null;
btSocket = null;
bConnect = false;
}
break;
case Common.MESSAGE_WRITE:

break;
case Common.MESSAGE_READ:

break;
case Common.MESSAGE_RECV:
Boolean bOn = false;
if(extr_validate_data())
{
bytesTofloat(bRec_out,3072);
broadcastIntent();
}
case Common.MESSAGE_TOAST:
Toast.makeText(getApplicationContext(),
msg.getData().getString(Common.TOAST),
Toast.LENGTH_SHORT).show();
break;
}
}
};

private BroadcastReceiver connectDevices = new BroadcastReceiver() {

public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
Log.d(Common.TAG, "Receiver:" + action);
update_dis();
mHandler.obtainMessage(Common.MESSAGE_CONNECT_SUCC EED,nNeed, -1, null).sendToTarget();
}
};

public void broadcastIntent()
{
Intent intent = new Intent();
intent.setAction("com.huasu.healthmonitor3.draw");
sendBroadcast(intent);
}