android - Android中的线程导致手机崩溃

Question

我不知道这段代码有什么问题，因为我无法阅读崩溃日志。我们不是在谈论应用程序崩溃，而是可能由死锁线程或某种锁定引起的电话崩溃。欢迎提出建议!

---

背景:

当我启动我的连接时，会显示一个对话框，当我按下“返回”按钮时，该对话框会卡住，一段时间后手机会崩溃...

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 mmSocket.connect() 在我按下后退按钮时运行。认为问题出在某处...

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) { }
}

}

下一个代码是来自对话框创建者的 fragment ，线程称为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;
(...)

这是执行 ConnectThread 类的代码 fragment

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);
        }
    }
}

希望你们能帮助我!感谢任何反馈

Answer 1

好的，您正在从看起来像 UI 线程的地方调用 BluetoothSocket.close()。这可能是导致“卡住”的原因。

当您说手机“崩溃”时，是指它会重新启动吗？如果是这样，这是完全重启(屏幕返回到您第一次打开手机时发生的情况)还是运行时重启(手机通常显示某种动画，在 Nexus 设备上，它是四色粒子喷雾)？如果不是重启，您的意思是您只是看到一个对话框，让您终止该应用程序？

无论哪种情况，您都可能希望获得对调用 BluetoothSocket.connect() 并调用 Thread.interrupt() 的线程的引用。我不确定 BluetoothSocket 是否可中断，但我们希望如此。然后在中断之后，调用 close()，这可能不应该在主线程上调用。