java - 方法不会覆盖其父类(super class)中的方法并且无法解析符号

Question

在覆盖中，我收到“方法未覆盖其父类(super class)中的方法”错误。我还在 super.onResume (); 中收到“onResume 无法解析方法”错误

它在 MainActivity 上运行，但是当我将代码移至 Service 类时，出现此错误。

As you can see:

public class Servis extends Service implements SensorEventListener{

    SensorManager mgr;
    Sensor temp;
    TextView text;
    StringBuilder msg = new StringBuilder(2048);
    MediaPlayer mediaPlayer;

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        mediaPlayer = MediaPlayer.create(Servis.this, R.raw.warning);
        mgr = (SensorManager) this.getSystemService(SENSOR_SERVICE);
        temp = mgr.getDefaultSensor(Sensor.TYPE_AMBIENT_TEMPERATURE); }

    @Override
    protected void onResume() {
        mgr.registerListener(this, temp, SensorManager.SENSOR_DELAY_NORMAL);
        super.onResume();
    }

    @Override
    protected void onPause() {
        mgr.unregisterListener(this, temp);
        super.onPause();
    }

    public void onAccuracyChanged(Sensor sensor, int accuracy) {

    }

        public void onSensorChanged(SensorEvent event) {
            float fahrenheit = event.values[0] * 9 / 5 + 32;
            if(fahrenheit < 68)
                mediaPlayer.start();
    }
}

Answer 1

一个Service不是Activity ，这就是为什么这些方法不能被重写。您可以安全地删除它们，而必须让 Activity 实现它们。当服务实现SensorEventListener时，这看起来像这样:

public class Servis extends Service implements SensorEventListener {

    @Override
    public void onCreate() {

    }
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

    }
    @Override
    public void onDestroy() {

    }
    @Override
    public IBinder onBind(Intent intent) {

    }


    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {

    }    
    @Override
    public void onSensorChanged(SensorEvent event) {

    }
}