Android 简单几行代码实现摇一摇功能

1、activity 实现加速度监听类   。。。。implements SensorEventListener

public class MainActivity extends AppCompatActivity implements SensorEventListener {

2、activity实现两个方法：

    @Override
    public void onSensorChanged(SensorEvent sensorEvent) {
        Sensor mySensor = sensorEvent.sensor;

        if (mySensor.getType() == Sensor.TYPE_ACCELEROMETER) {
            float x = sensorEvent.values[0];
            float y = sensorEvent.values[1];
            float z = sensorEvent.values[2];

            long curTime = System.currentTimeMillis();

            if ((curTime - lastUpdate) > 100) {
                long diffTime = (curTime - lastUpdate);
                lastUpdate = curTime;

                float speed = Math.abs(x + y + z - last_x - last_y - last_z)/ diffTime * 10000;

                if (speed > SHAKE_THRESHOLD) {
                    bb++;
                    if (bb%3==0)
                    Log.i("lgq","yyyyyy=--------"+bb);
//                    getRandomNumber();
                }

                last_x = x;
                last_y = y;
                last_z = z;
            }
        }
    }

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

    }

3、初始化数据，设置加速度监听，实现摇一摇功能

初始化：

private long lastUpdate = 0;
private float last_x, last_y, last_z;
private static final int SHAKE_THRESHOLD = 600;

private SensorManager senSensorManager;
private Sensor senAccelerometer;

设置加速度监听：

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

    senSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
    senAccelerometer = senSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
    senSensorManager.registerListener(this, senAccelerometer , SensorManager.SENSOR_DELAY_NORMAL);

}

4、运行项目摇一摇即可实现执行回调方法onSensorChanged，实现方法打印：

Log.i("lgq","yyyyyy=--------"+bb);