安卓磨损 : How does it work an activity life cycle?

Question

我制作了一个带有 Activity 的可穿戴应用。

@Override
protected void onCreate(Bundle savedInstanceState) {
    Log.i("WEAR", "CREATE");
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    final WatchViewStub stub = (WatchViewStub) findViewById(R.id.watch_view_stub);
    stub.setOnLayoutInflatedListener(new WatchViewStub.OnLayoutInflatedListener() {
        @Override
        public void onLayoutInflated(WatchViewStub stub) {
            mTextView = (TextView) stub.findViewById(R.id.text);
        }
    });
    SensorManager  sm = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
    Sensor hrs = sm.getDefaultSensor(Sensor.TYPE_HEART_RATE);
    sm.registerListener(hrListener, hrs, 3);

    if (savedInstanceState != null) {
        Log.i("WEAR", "RESTORE");
        // ... get previous sensor data from the bundle

    }
}

@Override
protected void onStop() {
    Log.i("WEAR", "STOP");
    super.onStop();
    sm.unregisterListener(hrListener, hrs);
}

@Override
protected void onDestroy() {
    Log.i("WEAR", "DESTROY");
    super.onDestroy();
}

@Override
protected void onSaveInstanceState(Bundle savedInstanceState) {
    Log.i("WEAR", "SAVE");
    // ... save sensor data in the bundle
    super.onSaveInstanceState(savedInstanceState);
}

private SensorEventListener hrListener = new SensorEventListener() {
    @Override
    public void onSensorChanged(final SensorEvent event) {
        final float hearRate = event.values[0];
        Log.i("SENSOR", hearRate);
        mTextView.setText(Float.toString(hearRate));
    }

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

    }
};

当它启动时，我会看到来自传感器的数据流。一段时间后，屏幕返回到时钟表盘，日志在我的应用程序调试流程中显示停止并保存。我重新启动应用程序，但 bundle 为空，我丢失了 bundle 中保存的所有数据。 onDestroy 从未被调用，所以为什么我没有得到任何包？这是 Gear Live。

Answer 1

关闭wear app的 Action 应该是从左向右滑动来关闭它。您将看到 onDestroy 被调用。如果您只需按下按钮(我只有第一代 moto 360。即侧边按钮)，就像将应用程序从前台关闭一样。所以只调用了 onStop 和 onStart 对。希望这个迟到的答案仍然对您有所帮助。