android 實現手機方向識別

//自定義導航圖標
private BitmapDescriptor mIconLocation;
//自定義傳感器implements SensorEventListener
private MyOrientationListener myOrientationListener;
//把監聽的x方向的值存儲到這裏
private float mCurrentX;

    //初始化圖標
        mIconLocation = BitmapDescriptorFactory.fromResource(R.drawable.ic_launcher);
        //初始化回調接口
        myOrientationListener = new MyOrientationListener(getApplicationContext());
        //設置回調接口
        myOrientationListener.setOnOrientationListener(new OnOrientationListener() {

            @Override
            public void OnOrientationChanged(float x) {
                // TODO Auto-generated method stub
                //回調接口的值存入mCurrentX
                mCurrentX=x;
            }
        });

在Activity的生命週期裏面實現 與 方向識別的生命週期同步

start方法裏面

    //方向識別開始
        myOrientationListener.start();      

stop方法裏面

//停止方向傳感器
        myOrientationListener.stop();

在本地數據設置裏面

    MyLocationData data = new MyLocationData.Builder()
    //設置方向
    .direction(mCurrentX)

//設置自定義圖標
        MyLocationConfiguration config = new MyLocationConfiguration(com.baidu.mapapi.map.MyLocationConfiguration.LocationMode.NORMAL, 
                        true, mIconLocation);
                mBaiduMap.setMyLocationConfigeration(config);

下面是傳感器監聽的實現代碼

public class MyOrientationListener implements SensorEventListener{
    //用來獲取Seosor
    private SensorManager mSensorManager;
    private Sensor mSensor;
    private Context mcontext;   
    private float lastX;
    private OnOrientationListener mOnOrientationListener;

    public MyOrientationListener(Context context) {
        super();
        context=this.mcontext;
    }
    @SuppressWarnings("deprecation")
    //開啓監聽的方法
    public void start(){
            mSensorManager = (SensorManager) mcontext.getSystemService(Context.SENSOR_SERVICE);
            if(mSensorManager!=null){
            mSensor = mSensorManager.getDefaultSensor(SensorManager.SENSOR_ORIENTATION);            
        }
            if(mSensor!=null){
            //註冊監聽
                mSensorManager.registerListener(this, mSensor, SensorManager.SENSOR_DELAY_UI);
            }
    }
    //停止監聽的方法
    public void stop(){
        mSensorManager.unregisterListener(this);
    }

    @Override
    public void onAccuracyChanged(Sensor arg0, int arg1) {

    }

    @Override
    public void onSensorChanged(SensorEvent event) {
//拿到方向傳感器       if(event.sensor.getType()==Sensor.TYPE_ORIENTATION){
            float x = event.values[SensorManager.DATA_X];
            //如果移動超過一個精度則轉向
            if(Math.abs(x-lastX)>1.0){
                if(mOnOrientationListener!=null){
                    mOnOrientationListener.OnOrientationChanged(x);
                }
            }
            lastX  =x;
        }       
    }

    public void setOnOrientationListener(OnOrientationListener mOnOrientationListener) {
        this.mOnOrientationListener = mOnOrientationListener;
    }
//定義回調接口
    public interface OnOrientationListener{
    //傳遞改變的監聽的x方向的值
        void OnOrientationChanged(float x);
    }
}