能知道佩戴装置是否在手腕上吗？

Question

我想知道是否有可能知道佩戴设备是否在手边。我需要运行一个仅在手头有脉搏的服务，如果没有，那么它应该停止服务，并在手头有脉搏时重新启动它。

Answer 1

你可以试着用心率传感器

public class MainActivity extends WearableActivity implements SensorEventListener {

    private static final String TAG = "MainActivity";
    private TextView mTextViewHeart;
    SensorManager mSensorManager;
    Sensor mHeartRateSensor;
    SensorEventListener sensorEventListener;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mTextViewHeart = (TextView) findViewById(R.id.heart);
        mSensorManager = ((SensorManager) getSystemService(SENSOR_SERVICE));
        mHeartRateSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_HEART_RATE);
        mSensorManager.registerListener(this, mHeartRateSensor, SensorManager.SENSOR_DELAY_NORMAL);
        Log.i(TAG, "LISTENER REGISTERED.");
        mTextViewHeart.setText("Something here");


        mSensorManager.registerListener(sensorEventListener, mHeartRateSensor, mSensorManager.SENSOR_DELAY_FASTEST);
    }


    public void onResume(){
        super.onResume();
    }

    public void onAccuracyChanged(Sensor sensor, int accuracy) {
        Log.d(TAG, "onAccuracyChanged - accuracy: " + accuracy);
    }

    public void onSensorChanged(SensorEvent event) {
        if (event.sensor.getType() == Sensor.TYPE_HEART_RATE) {
            String msg = "" + (int)event.values[0];
            mTextViewHeart.setText(msg);
            Log.d(TAG, msg);
        }
        else
            Log.d(TAG, "Unknown sensor type");
    }

}

Answer 2

一些设备，如微软的Band2，有一个专门用来检测设备是否佩戴的传感器。根据项目的不同，可以考虑为该设备进行开发