Android进价篇重力感应

Android中为了实现一些特定的效应，必须使用重力感应，尤其是在游戏当中。

在Android中管理重力感应的是SensorManager。

@Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        mRegisterSensor = false;//控制开关
        mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);//获取到Sensor服务
    }

    @Override
    protected void onPause() {
        // TODO Auto-generated method stub
        //卸载
        if(mRegisterSensor){
            mSensorManager.unregisterListener(this);
            mRegisterSensor = false;
        }
        super.onPause();
    }

    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();
        
        //抓取所有的Sensor，进行注册
        List<Sensor> sensors = mSensorManager.getSensorList(Sensor.TYPE_ORIENTATION);
        
        if(sensors.size()>0){
            Sensor sensor = sensors.get(0);
            mRegisterSensor = mSensorManager.registerListener(this, sensor,SensorManager.SENSOR_DELAY_FASTEST);
        }
    }

    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void onSensorChanged(SensorEvent event) {
        // TODO Auto-generated method stub
        /**
         * x,y,z表示手机在x,y,z轴的倾斜度
         * google sdk中将手机进行三维坐标划分
         * 比如y=-180 表示手机翻转放在水平面上
         */
        if(event.sensor.getType() == Sensor.TYPE_ORIENTATION){
            float x = event.values[SensorManager.DATA_X];
            float y = event.values[SensorManager.DATA_Y];
            float z = event.values[SensorManager.DATA_Z];
        }
    }