由于我无法阅读崩溃日志，因此我不知道这段代码中出了什么问题。我们讨论的不是应用程序崩溃，而是手机崩溃，可能是由于死锁线程或某种锁定引起的。欢迎提出建议！
背景：
当我启动连接时，会显示一个对话框，当我按下返回按钮时，该对话框会冻结，过一会儿后手机就会崩溃...
代码：
这是处理与设备连接的线程。我完全没有连接到设备的问题。我所知道的是，当我按下返回按钮时，mmSocket.connect()正在运行。认为问题就出在这里...
class ConnectThread extends Thread {
/**
*
*/
private Handler threadhandler;
private BluetoothDevice mmDevice;
private volatile BluetoothSocket mmSocket;
private Message toMain;
// private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
public ConnectThread(Handler threadhandler, BluetoothDevice device) {
this.threadhandler = threadhandler;
this.mmDevice = device;
// Get a BluetoothSocket to connect with the given BluetoothDevice
try {
Method m = mmDevice.getClass().getMethod("createRfcommSocket", new Class[] {int.class});
mmSocket = (BluetoothSocket) m.invoke(mmDevice, 1);
}catch (NoSuchMethodException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
}
public void run() {
Looper.prepare();
try {
// Connect the device through the socket. This will block
// until it succeeds or throws an exception
mmSocket.connect();
toMain = threadhandler.obtainMessage();
toMain.arg1 = 1;
threadhandler.sendMessage(toMain);
} catch (SecurityException e) {
Log.e("SecurityExcep", "Oh noes" , e);
toMain = threadhandler.obtainMessage();
toMain.arg1 = 2;
threadhandler.sendMessage(toMain);
Log.w("MESSAGE", e.getMessage());
}catch (IOException e) {
//Bad connection, let's get the hell outta here
try {
Log.e("IOExcep", "Oh noes" , e);
Log.w("MESSAGE", e.getMessage());
mmSocket.close();
toMain = threadhandler.obtainMessage();
toMain.arg1 = 2;
toMain.obj = e.getMessage();
threadhandler.sendMessage(toMain);
return;
} catch (IOException e1) {
Log.e("IOExcep2", "Oh noes" , e);
}
}
try {
mmSocket.close();
} catch (IOException e) {
Log.d("CONNECT_CONSTRUCTOR", "Unable to close the socket", e);
}
toMain = threadhandler.obtainMessage();
toMain.arg1 = 3;
threadhandler.sendMessage(toMain);
Looper.loop();
return;
// Now it should be paired.. only thing to do now is let the user commit to the rest
}
/** Will cancel an in-progress connection, and close the socket */
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) { }
}
}
下面的代码片段是对话框创建器中的一部分，线程名为d：
(...)
case DIALOG_BT_ADDING:
search_dialog = new ProgressDialog(this);
search_dialog.setTitle(R.string.adding);
search_dialog.setMessage(res.getText(R.string.bluetooth_add_accept));
search_dialog.setIndeterminate(true);
search_dialog.setCancelable(true);
search_dialog.setOnCancelListener(new OnCancelListener() {
@Override
public void onCancel(DialogInterface dialog) {
Log.i("THREAD CONNECT", "Is it alive?: " + d.isAlive());
if(d != null && d.isAlive()){
d.cancel();
//d = null;
}
if(d2 != null && d2.isAlive()){
d2.cancel(false);
//d2 = null;
}
search_dialog.dismiss();
showDialog(DIALOG_NEW_DEVICE_FOUND);
}
});
return search_dialog;
(...)
这里是执行
ConnectThread类的代码片段。private void connectBluetooth(boolean nextstage, IOException e1){
if(!nextstage){
showDialog(DIALOG_BT_ADDING);
d = new ConnectThread(threadhandler, selected_car.getDevice());
d.start();
}
else{
if(e1 != null){
d2 = new BluetoothCheckThread(checkthreadhandler,mBluetoothAdapter,
5000, car_bt, after_bt);
d2.start();
search_dialog.dismiss();
}
else{
showDialog(DIALOG_BT_ADDING_FAILED);
}
}
}
希望你们能够帮助我！感谢任何反馈。
Looper引起的问题吗？ - MazzeLoopers已被移除，但问题仍然存在。当在mmSocket.connect()进程期间调用mmSocket.close()时，它会失败。请注意，mmSocket.connect()是一个锁定的调用..这就是问题所在！ - Mazze