我已经设置了蓝牙连接，并在蓝牙聊天中使用了一些代码。我发现启动时会出现间歇性崩溃。我认为它由于startActivityForResults而不是等待连接。我看到一些过去的线索已经解决了，但海报没有分享解决方案。
我也无法弄清楚如何发布我的logcat信息，以便在线程中轻松阅读。我正在使用Android studio 1.3.1，我的选项是打印。
void findBT() {
mmDevice = null;
BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (mBluetoothAdapter == null) {
//msbox("BlueTooth ", "This device does not support bluetooth");
isBTConnected = false;
// Bluetooth tile indicator
Resources res = getResources();
} else {
if (!mBluetoothAdapter.isEnabled()) {
Intent enableBluetooth = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBluetooth,0);
}
}
Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
if (pairedDevices.size() > 0) {
for (BluetoothDevice device : pairedDevices) {
// if(device.getName().equals("RN42-45A9"))
if (device.getName().equals("RN42-4485")) {
Log.d("TAG", "BT true");
mmDevice = device;
isBTConnected = true;
// Bluetooth tile indicator
Resources res = getResources();
} else {
// Bluetooth tile indicator
isBTConnected = false;
Log.d("TAG", "BT false");
Resources res = getResources();
}
}
} else {
isBTConnected = false;
}
}
void openBT() throws IOException {
UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805f9b34fb");
mmSocket = mmDevice.createRfcommSocketToServiceRecord(uuid);
mmSocket.connect();
mmOutputStream = mmSocket.getOutputStream();
mmInputStream = mmSocket.getInputStream();
beginListenForData();
}
logcat的
08-22 13:32:13.781 11239-11314/com.example.jerry.els2015 W/dalvikvm﹕ threadid=12: thread exiting with uncaught exception (group=0x41879c08)
08-22 13:32:13.781 11239-11314/com.example.jerry.els2015 E/AndroidRuntime﹕ FATAL EXCEPTION: Thread-502
Process: com.example.jerry.els2015, PID: 11239
java.lang.NullPointerException
at com.example.jerry.els2015.MainActivity.GetData(MainActivity.java:1087)
at com.example.jerry.els2015.MainActivity.access$300(MainActivity.java:44)
at com.example.jerry.els2015.MainActivity$12.run(MainActivity.java:840)
at java.lang.Thread.run(Thread.java:841)
08-22 13:32:13.861 11239-11239/com.example.jerry.els2015 D/GC﹕ <tid=11239> OES20 ===> GC Version : GC Ver rls_pxa988_KK44_GC13.20
08-22 13:32:13.901 11239-11239/com.example.jerry.els2015 D/OpenGLRenderer﹕ Enabling debug mode 0
08-22 13:32:13.911 11239-11239/com.example.jerry.els2015 D/ProgressBar﹕ updateDrawableBounds: left = 0
08-22 13:32:13.911 11239-11239/com.example.jerry.els2015 D/ProgressBar﹕ updateDrawableBounds: top = 0
08-22 13:32:13.911 11239-11239/com.example.jerry.els2015 D/ProgressBar﹕ updateDrawableBounds: right = 308
08-22 13:32:13.911 11239-11239/com.example.jerry.els2015 D/ProgressBar﹕ updateDrawableBounds: bottom = 50
08-22 13:32:13.911 11239-11239/com.example.jerry.els2015 D/ProgressBar﹕ updateDrawableBounds: mProgressDrawable.setBounds()
08-22 13:37:14.334 11239-11314/? I/Process﹕ Sending signal. PID: 11239 SIG: 9
这是连接代码。
void openBT() throws IOException {
UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805f9b34fb");
mmSocket = mmDevice.createRfcommSocketToServiceRecord(uuid);
mmSocket.connect();
mmOutputStream = mmSocket.getOutputStream();
mmInputStream = mmSocket.getInputStream();
beginListenForData();
}
这是getdata
private void GetData(int FixtureNumber) {
Log.d("TAG", "Value " + intArrayToInt(intArray1));
intByteCount=9; // set to receive 9 bytes
byte buffer[] = new byte[6];
buffer[0] = ((byte) 1); // Command (get data)
buffer[1] = ((byte) Master_value);
buffer[2] = ((byte) intArrayToInt(intArray1));
buffer[3] = ((byte) intArrayToInt(intArray2));
buffer[4] = ((byte) 3);
buffer[5] = ((byte) 4);
if (isBTConnected) {
try {
mmOutputStream.write(buffer);
} catch (IOException e) {
e.printStackTrace();
}
}
}