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中将手机进行三维座标划分
		 * 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];
		}
	}