安卓原生百度地图（3）方向感应器的定位功能

红太狼 2023-08-17 17:09 106阅读 0赞

1、在AndroidManifest.xml文件中加入定位权限：

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

2、创建一个传感器的类，代码如下

package com.example.baidumap;
    
    import android.content.Context;
    import android.hardware.Sensor;
    import android.hardware.SensorEvent;
    import android.hardware.SensorEventListener;
    import android.hardware.SensorManager;
    
    public class MyOrientationListener implements SensorEventListener {
    
        private SensorManager mSensorManager;
        private Context mContext;
        private Sensor mSensor;
        private float lastX;
    
        public MyOrientationListener(Context context){
            this.mContext = context;
        }
    
        @SuppressWarnings("deprecation")
        public void start(){
            mSensorManager = (SensorManager) mContext
                    .getSystemService(Context.SENSOR_SERVICE);
            if (mSensorManager != null){
                // 获得方向传感器
                mSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION);
            }
    
            if (mSensor != null){
                mSensorManager.registerListener(this, mSensor,
                        SensorManager.SENSOR_DELAY_UI);
            }
        }
    
        public void stop(){
            mSensorManager.unregisterListener(this);
        }
    
        @Override
        public void onAccuracyChanged(Sensor arg0, int arg1){
            // TODO Auto-generated method stub
        }
    
        @SuppressWarnings({ "deprecation" })
        @Override
        public void onSensorChanged(SensorEvent event){
            if (event.sensor.getType() == Sensor.TYPE_ORIENTATION)
            {
                float x = event.values[SensorManager.DATA_X];
    
                if (Math.abs(x - lastX) > 1.0)
                {
                    if (mOnOrientationListener != null)
                    {
                        mOnOrientationListener.onOrientationChanged(x);
                    }
                }
                lastX = x;
            }
        }
    
        private OnOrientationListener mOnOrientationListener;
    
        public void setOnOrientationListener(OnOrientationListener mOnOrientationListener){
            this.mOnOrientationListener = mOnOrientationListener;
        }
    
        public interface OnOrientationListener{
            void onOrientationChanged(float x);
        }
    }

3、在布局文件中加入一个定位的按钮

4、添加资源文件（该图片原位置在本人的[百度云盘][Link 1]（提取码：k5b7）压缩包assets中，拿过来分别放在如下文件中）

![1264306-20190819142632780-781410589.png][]

5、MainActivity代码（注意：MainActivity继承了iew.OnClickListener接口）

package com.example.baidumap;
    
    import androidx.appcompat.app.AppCompatActivity;
    
    import android.content.Context;
    import android.os.Bundle;
    import android.view.View;
    import android.widget.Button;
    import android.widget.Toast;
    
    import com.baidu.location.BDAbstractLocationListener;
    import com.baidu.location.BDLocation;
    import com.baidu.location.LocationClient;
    import com.baidu.location.LocationClientOption;
    import com.baidu.mapapi.CoordType;
    import com.baidu.mapapi.SDKInitializer;
    import com.baidu.mapapi.map.BaiduMap;
    import com.baidu.mapapi.map.BitmapDescriptor;
    import com.baidu.mapapi.map.BitmapDescriptorFactory;
    import com.baidu.mapapi.map.MapStatusUpdate;
    import com.baidu.mapapi.map.MapStatusUpdateFactory;
    import com.baidu.mapapi.map.MapView;
    import com.baidu.mapapi.map.MyLocationConfiguration;
    import com.baidu.mapapi.map.MyLocationData;
    import com.baidu.mapapi.model.LatLng;
    
    public class MainActivity extends AppCompatActivity implements View.OnClickListener{
        private Context context;
        private MapView mapView = null;
        private BaiduMap baiduMap = null;
    
        //定位相关
        private double mLatitude;
        private double mLongtitude;
    
        private MyOrientationListener myOrientationListener; //方向传感器
        private float mCurrentx;
    
        //自定义图标
        private BitmapDescriptor mIconLocation;
        private LocationClient mLocationClient;
        public BDAbstractLocationListener myListener;
        private LatLng mLastLocationData;
        private boolean isFirstin = true;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            SDKInitializer.initialize(getApplicationContext());
            setContentView(R.layout.activity_main);
            SDKInitializer.setCoordType(CoordType.BD09LL);
            this.context = this;
    
            mapView = (MapView)findViewById(R.id.baiduMapView);
            baiduMap = mapView.getMap(); //获取地图控件引用
    
            initLocation();
            button();
        }
    
        @Override
        protected void onStart() {
            super.onStart();
            baiduMap.setMyLocationEnabled(true); //开启定位
            if (!mLocationClient.isStarted())mLocationClient.start();
            myOrientationListener.start(); //开启方向传感器
        }
    
        @Override
        protected void onResume() {
            super.onResume();
            mapView.onResume();
        }
        @Override
        protected void onPause() {
            super.onPause();
            mapView.onPause();
        }
        @Override
        protected void onStop() {
            super.onStop();
            baiduMap.setMyLocationEnabled(false); //停止定位
            mLocationClient.stop();
            myOrientationListener.stop(); //停止方向传感器
        }
    
        @Override
        protected void onDestroy() {
            super.onDestroy();
            baiduMap.setMyLocationEnabled(false);
            mapView.onDestroy();
            mapView = null;
        }
    
        @Override
        public void onClick(View view) {
            SDKInitializer.initialize(getApplicationContext());
            switch (view.getId()) {
                case R.id.btn_Location: {
                    centerToMyLocation(mLatitude, mLongtitude);
                    break;
                }
            }
        }
    
        //按钮响应
        private void button() {
            Button btn_lco = (Button) findViewById(R.id.btn_Location); //按钮
            btn_lco.setOnClickListener(this); //按钮处理
        }
    
        //定位
        private class MyLocationListener extends BDAbstractLocationListener {
            @Override
            public void onReceiveLocation(BDLocation location) {
                //mapView 销毁后不在处理新接收的位置
                if (location == null || mapView == null){
                    return;
                }
                MyLocationData locData = new MyLocationData.Builder()
                        .accuracy(location.getRadius())
                        // 此处设置开发者获取到的方向信息，顺时针0-360
                        .direction(mCurrentx).latitude(location.getLatitude())
                        .longitude(location.getLongitude()).build();
                baiduMap.setMyLocationData(locData);
                //设置自定义图标
                MyLocationConfiguration config = new MyLocationConfiguration(MyLocationConfiguration.LocationMode.NORMAL, true, mIconLocation);
                baiduMap.setMyLocationConfiguration(config);
                //更新经纬度
                mLatitude = location.getLatitude();
                mLongtitude = location.getLongitude();
                //设置起点
                mLastLocationData = new LatLng(mLatitude, mLongtitude);
                if (isFirstin) {
                    centerToMyLocation(location.getLatitude(), location.getLongitude());
                    if (location.getLocType() == BDLocation.TypeGpsLocation) {
                        // GPS定位结果
                        Toast.makeText(context, "定位:"+location.getAddrStr(), Toast.LENGTH_SHORT).show();
                    } else if (location.getLocType() == BDLocation.TypeNetWorkLocation) {
                        // 网络定位结果
                        Toast.makeText(context, "定位:"+location.getAddrStr(), Toast.LENGTH_SHORT).show();
                    } else if (location.getLocType() == BDLocation.TypeOffLineLocation) {
                        // 离线定位结果
                        Toast.makeText(context, "定位:"+location.getAddrStr(), Toast.LENGTH_SHORT).show();
                    } else if (location.getLocType() == BDLocation.TypeServerError) {
                        Toast.makeText(context, "定位:服务器错误", Toast.LENGTH_SHORT).show();
                    } else if (location.getLocType() == BDLocation.TypeNetWorkException) {
                        Toast.makeText(context, "定位:网络错误", Toast.LENGTH_SHORT).show();
                    } else if (location.getLocType() == BDLocation.TypeCriteriaException) {
                        Toast.makeText(context, "定位:手机模式错误，请检查是否飞行", Toast.LENGTH_SHORT).show();
                    }
                    isFirstin = false;
                }
            }
        }
        //初始化定位
        private void initLocation() {
            //缩放地图
            MapStatusUpdate msu = MapStatusUpdateFactory.zoomTo(15.0f);
            baiduMap.setMapStatus(msu);
            //开启定位
            baiduMap.setMyLocationEnabled(true);
            //声明LocationClient类
            mLocationClient = new LocationClient(this);
            //通过LocationClientOption设置LocationClient相关参数
            LocationClientOption option = new LocationClientOption();
            option.setOpenGps(true); // 打开gps
            option.setCoorType("bd09ll"); // 设置坐标类型
            option.setIsNeedAddress(true);//设置是否需要地址信息
            option.setScanSpan(1000);
            //设置locationClientOption
            mLocationClient.setLocOption(option);
            myListener = new MyLocationListener();
            //注册监听函数
            mLocationClient.registerLocationListener(myListener);
            //初始化图标
            mIconLocation = BitmapDescriptorFactory.fromResource(R.drawable.navi_map_gps);
            initOrientation();
            //开始定位
            mLocationClient.start();
        }
        //回到定位中心
        private void centerToMyLocation(double latitude, double longtitude) {
            baiduMap.clear();
            mLastLocationData = new LatLng(latitude, longtitude);
            MapStatusUpdate msu = MapStatusUpdateFactory.newLatLng(mLastLocationData);
            baiduMap.animateMapStatus(msu);
        }
        //传感器
        private void initOrientation() {
            //传感器
            myOrientationListener = new MyOrientationListener(context);
            myOrientationListener.setOnOrientationListener(new MyOrientationListener.OnOrientationListener() {
                @Override
                public void onOrientationChanged(float x) {
                    mCurrentx = x;
                }
            });
        }
    }

6、启动项目

![1264306-20190819144546713-330662108.png][]

7、[附上本章的项目][Link 2]（提取码：jl2v）。

转载于:https://www.cnblogs.com/Mr-Deng/p/11377053.html

[Link 1]: https://pan.baidu.com/s/12dINjAHMQKrQCz-SHQebqg
[1264306-20190819142632780-781410589.png]: /images/20230808/f04486bbd20f4c57bbdcad01ede6199d.png
[1264306-20190819144546713-330662108.png]: /images/20230808/9d57c12bf55a49bc9bec62f82d73a5f5.png
[Link 2]: https://pan.baidu.com/s/1-L13Vl2PcIjQHHDOMCSzNw