java - Android，Thread，无法取消注册 SensorEventListener

Question

我好像和这位先生有同样的问题: SensorEventListener doesn't get unregistered with unregisterListener() method

public void onCreate(Bundle bundle) {
            super.onCreate(bundle);
            ...
            loopThread();
}

private void loopThread() {
            boolean found = kill;
            System.out.println("Looping until Found!");
            locationThread = new Thread(){
                    private float myacc;

                    @Override
                    @Override
                    public void run() {

                            while (found == false && !kill){
                                    System.out.println("Another Loop!");
                                    getMyLoc();
                                    found = isFound(mylat,mylng,target_lat,target_lng,radius);
                                    try {
                                            synchronized(locationThread){
                                                    locationThread.wait(100);
                                            }

                                    } catch (InterruptedException e) {
                                            // TODO Auto-generated catch block
                                            e.printStackTrace();
                                    }
                            }
                            mSensorManager.unregisterListener(senslistener, mAccelerometer);
                            mSensorManager.unregisterListener(senslistener, mGravitometer);
                            mSensorManager.unregisterListener(senslistener);
                            locationThread.interrupt();
                    }
}

@Override
    public void onPause(){
            super.onPause();
            mSensorManager.unregisterListener(senslistener, mAccelerometer);
            mSensorManager.unregisterListener(senslistener, mGravitometer);
            locationThread.interrupt();
    }
    @Override
    public void onResume(){
            super.onResume();
            senslistener = new mySensorEventListener();
            mSensorManager.registerListener(senslistener, mAccelerometer,     SensorManager.SENSOR_DELAY_NORMAL);
            mSensorManager.registerListener(senslistener, mGravitometer, SensorManager.SENSOR_DELAY_NORMAL);
            if (true)
                    loopThread();
    }

private void registerSensors() {
            mSensorManager =     (SensorManager)context.getSystemService(Context.SENSOR_SERVICE);
            List<Sensor> mySensors = mSensorManager.getSensorList(Sensor.TYPE_ORIENTATION);
            if(mySensors.size() > 0){
                    mAccelerometer =     mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
                    mGravitometer =     mSensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);

                    mSensorManager.registerListener(senslistener, mAccelerometer, SensorManager.SENSOR_DELAY_NORMAL);
                    mSensorManager.registerListener(senslistener, mGravitometer, SensorManager.SENSOR_DELAY_NORMAL);
                    Toast.makeText(context, "Getting your location...", Toast.LENGTH_LONG).show();
            }
            else{
                    Toast.makeText(context, "No ORIENTATION Sensor", Toast.LENGTH_LONG).show();
            }
    }


public boolean onKeyDown(int keyCode, KeyEvent event) {
            if (keyCode == KeyEvent.KEYCODE_BACK) {
                    Intent i = new Intent(this, MFLMain.class);
                    if (locationThread != null)
                            if(locationThread.isAlive()){

                    mSensorManager.unregisterListener(senslistener, mAccelerometer);
                    mSensorManager.unregisterListener(senslistener, mGravitometer);
                    mSensorManager.unregisterListener(senslistener);
                    locationThread.interrupt();
                            }
                    locator.stopListener();
                    kill = true;
                    System.out.println("Kill the app "+kill);
                    finish();
                    startActivity(i);
                    return false;
            }
            return super.onKeyDown(keyCode, event);
    }

当我回击以隐藏应用程序并终止 Activity 时，我仍然在 logcat 中得到 system.out。 thead 退出，正如缺少 system.out 所证明的那样。我很困惑，我不认为范围是问题，因为传感器管理器是通过 init 方法而不是其他地方实例化的。

Answer 1

也许是一个远景，但我能看到的与已经运行的示例和您的示例(没有看到额外的代码)唯一不同的是实现 SensorEventListener 并将其传递到注册和注销事件中，而不是您的自定义 SensorEventListener。

请看这个 stackoverflow，有人尝试按照您的方式使用 new 运算符来实例化监听器和似乎对他有用的答案。

How to convert a program that uses SensorListener to SensorEventListener

public class MySensorActivity extends Activity implements SensorEventListener {


public void onCreate(Bundle bundle) {
        super.onCreate(bundle);
        ...
        loopThread();
}

  private void loopThread() {
        boolean found = kill;
        System.out.println("Looping until Found!");
        locationThread = new Thread(){
                private float myacc;

                @Override
                @Override
                public void run() {

                        while (found == false && !kill){
                                System.out.println("Another Loop!");
                                getMyLoc();
                                found = isFound(mylat,mylng,target_lat,target_lng,radius);
                                try {
                                        synchronized(locationThread){
                                                locationThread.wait(100);
                                        }

                                } catch (InterruptedException e) {
                                        // TODO Auto-generated catch block
                                        e.printStackTrace();
                                }
                        }
                        mSensorManager.unregisterListener(this, mAccelerometer);
                        mSensorManager.unregisterListener(this, mGravitometer);
                        mSensorManager.unregisterListener(this);
                        locationThread.interrupt();
                }
}

@Override
public void onPause(){
        super.onPause();
        mSensorManager.unregisterListener(this, mAccelerometer);
        mSensorManager.unregisterListener(this, mGravitometer);
        locationThread.interrupt();
}
@Override
public void onResume(){
        super.onResume();
        registerSensors();
        mSensorManager.registerListener(this, mAccelerometer,     SensorManager.SENSOR_DELAY_NORMAL);
        mSensorManager.registerListener(this, mGravitometer, SensorManager.SENSOR_DELAY_NORMAL);
        if (true)
                loopThread();
}

private void registerSensors() {
        mSensorManager =     (SensorManager)context.getSystemService(Context.SENSOR_SERVICE);
        List<Sensor> mySensors = mSensorManager.getSensorList(Sensor.TYPE_ORIENTATION);
        if(mySensors.size() > 0){
                mAccelerometer =     mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
                mGravitometer =     mSensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);

                mSensorManager.registerListener(this, mAccelerometer, SensorManager.SENSOR_DELAY_NORMAL);
                mSensorManager.registerListener(this, mGravitometer, SensorManager.SENSOR_DELAY_NORMAL);
                Toast.makeText(context, "Getting your location...", Toast.LENGTH_LONG).show();
        }
        else{
                Toast.makeText(context, "No ORIENTATION Sensor", Toast.LENGTH_LONG).show();
        }
}


 public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK) {
                Intent i = new Intent(this, MFLMain.class);
                if (locationThread != null)
                        if(locationThread.isAlive()){

                mSensorManager.unregisterListener(this, mAccelerometer);
                mSensorManager.unregisterListener(this, mGravitometer);
                mSensorManager.unregisterListener(this);
                locationThread.interrupt();
                        }
                locator.stopListener();
                kill = true;
                System.out.println("Kill the app "+kill);
                finish();
                startActivity(i);
                return false;
        }
        return super.onKeyDown(keyCode, event);
}