本人在项目开发过程中遇到需要开发一款手表应用，并且需要获取心率等生命体征信息。此处以获取心率举例记录

首先获取权限 

<uses-permission android:name="android.permission.BODY_SENSORS" />

其实只是实现读取心率是比较容易的，接下来是部分代码

    private SensorManager mSensorManager;
    private Sensor mHeartRateSensor;

    @Override
    public void onCreate() {
        super.onCreate();
        //判断是否有权限，注意没有权限是取不到数据的，切记！此处没有判断用户是否点了是，所以需要自己加
        if (!checkPer(Manifest.permission.BODY_SENSORS)) {
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.BODY_SENSORS}, 100);
        }
        mSensorManager =(((SensorManager)getSystemService(SENSOR_SERVICE)));
        mHeartRateSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_HEART_RATE);
        mSensorManager.registerListener(sensorEventListener, mHeartRateSensor, 3);
    }
    private boolean checkPer(String permission) {
        return ActivityCompat.checkSelfPermission(this, permission) == PackageManager.PERMISSION_GRANTED;
    }

    SensorEventListener sensorEventListener = new SensorEventListener() {
        @Override
        public void onSensorChanged(SensorEvent sensorEvent) {
            Log.d(TAG, "sensor event: " + sensorEvent.accuracy + " = " + sensorEvent.values[0]);
            //在这里获取心率并处理  sensorEvent.values[0]; 
        }

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

        }
    };


    @Override
    protected void onDestroy() {
        super.onDestroy();
        mSensorManager.unregisterListener(sensorEventListener);

    }

查看手表可以获取的数据内容

List<Sensor> sensors = mSensorManager.getSensorList(Sensor.TYPE_ALL);
		 for (Sensor sensor : sensors) {
		     Log.e(TAG,"sensor:[name=" + sensor.getName() + ";type="
		     + sensor.getType() + ";vendor="+ sensor.getVendor() + "]");
		 }