安卓复习10

安卓复习10

下面的代码通过手机的方向传感器显示方位角、倾斜角和滚动角在TextView

public class MainActivity extends AppCompatActivity implements SensorEventListener {
          
	private TextView tv_value1;
    private TextView tv_value2;
    private TextView tv_value3;
    private SensorManager sManager;
    private Sensor mSensorOrientation;
    protected void onCreate(Bundle savedInstanceState) {
     
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
		//获取系统的传感器服务
        sManager = (SensorManager) getSystemService(SENSOR_SERVICE);
        mSensorOrientation = sManager.getDefaultSensor(Sensor.TYPE_ORIENTATION);

   		//注册监听，SensorManager.SENSOR_DELAY_UI获取传感器状态和值的频率为低
 		sManager.registerListener(this, mSensorOrientation, SensorManager.SENSOR_DELAY_UI);
        bindViews();
    }
	//绑定视图
    private void bindViews() {
     
        tv_value1 = (TextView) findViewById(R.id.tv_value1);
        tv_value2 = (TextView) findViewById(R.id.tv_value2);
        tv_value3 = (TextView) findViewById(R.id.tv_value3);
    }
    @Override
    public void onSensorChanged(SensorEvent event) {
     
		//使用Math.round()方法取整
        tv_value1.setText("方位角：" + (float) (Math.round(event.values[0] * 100)) / 100);
        tv_value2.setText("倾斜角：" + (float) (Math.round(event.values[1] * 100)) / 100);
        tv_value3.setText("滚动角：" + (float) (Math.round(event.values[2] * 100)) / 100);
    }
    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {
     
    }
}