[移动开发]基于百度LBS的APP开发

一、引用百度SDK

1.登录平台

2.创建应用

3.获取密匙

4.下载开发包

5. 添加注册远程服务和配置应用Key

<service android:name="com.baidu.location.f" android:enabled="true" android:process=":remote"/>
<meta-data
    android:name="com.baidu.lbsapi.API_KEY"
    android:value="NDnYRd8LK85vGbLeRVaV23x9RccY5M3p"/>

二、在AS中完成

1.布局mainactivity.xml

public class MainActivity extends AppCompatActivity {

    public LocationClient mLocationClient; //定位客户端
    TextView tv_positionText;  //显示定位信息控件

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        //如果没有定位权限，动态请求用户允许使用该权限
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 1);
        }else {
            requestLocation();
        }
    }
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        switch (requestCode) {
            case 1:
                if (grantResults[0] != PackageManager.PERMISSION_GRANTED) {
                    Toast.makeText(this, "没有定位权限！", Toast.LENGTH_LONG).show();
                    finish();
                } else {
                    requestLocation();
                }
        }
    }

    private void requestLocation() {
        initLocation();  //初始化
        mLocationClient.start();  //开始定位
    }
    @Override
    protected void onDestroy() {
        super.onDestroy();  
        mLocationClient.stop();
    }

    private void initLocation() {   
        setContentView(R.layout.activity_main);
        mLocationClient = new LocationClient(getApplicationContext());
        mLocationClient.registerLocationListener(new MyLocationListener());
        tv_positionText = findViewById(R.id.tv_positionText);
        //定位客户端操作
        LocationClientOption option = new LocationClientOption();
        //设置扫描时间间隔（单位：毫秒）
        option.setScanSpan(1000);
        //设置定位模式，三选一
        option.setLocationMode(LocationClientOption.LocationMode.Hight_Accuracy);
        /*option.setLocationMode(LocationClientOption.LocationMode.Battery_Saving);
        option.setLocationMode(LocationClientOption.LocationMode.Device_Sensors);*/
        //设置需要地址信息
        option.setIsNeedAddress(true);
        //保存定位参数
        mLocationClient.setLocOption(option);
    }

    class MyLocationListener implements BDLocationListener {
        @Override
        public void onReceiveLocation(BDLocation bdLocation) {
            StringBuffer currentPosition = new StringBuffer();
            currentPosition.append("Longitude：").append(bdLocation.getLongitude()).append("\n");
            currentPosition.append("Latitude：").append(bdLocation.getLatitude()).append("\n");
            currentPosition.append("Country：").append(bdLocation.getCountry()).append("\n");
            currentPosition.append("Province：").append(bdLocation.getProvince()).append("\n");
            currentPosition.append("City：").append(bdLocation.getCity()).append("\n");
            currentPosition.append("District：").append(bdLocation.getDistrict()).append("\n");
            currentPosition.append("Street：").append(bdLocation.getStreet()).append("\n");
            currentPosition.append("Address：").append(bdLocation.getAddrStr());
            tv_positionText.setText(currentPosition);
        }
    }

2.界面程序MainActivity.java

public class MainActivity extends AppCompatActivity {

    LocationClient mLocationClient;  //定位客户端
    MapView mapView;  //Android Widget地图控件
    BaiduMap baiduMap;
    boolean isFirstLocate = true;

    TextView tv_Lat;  //纬度
    TextView tv_Lon;  //经度
    TextView tv_Add;  //地址

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //如果没有定位权限，动态请求用户允许使用该权限
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 1);
        }else {
            requestLocation();
        }
    }
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        switch (requestCode) {
            case 1:
                if (grantResults[0] != PackageManager.PERMISSION_GRANTED) {
                    Toast.makeText(this, "没有定位权限！", Toast.LENGTH_LONG).show();
                    finish();
                } else {
                    requestLocation();
                }
        }
    }
    private void requestLocation() {
        initLocation();
        mLocationClient.start();
    }
    private void initLocation() {  //初始化
        mLocationClient = new LocationClient(getApplicationContext());
        mLocationClient.registerLocationListener(new MyLocationListener());
        SDKInitializer.initialize(getApplicationContext());
        setContentView(R.layout.activity_main);

        mapView = findViewById(R.id.bmapView);
        baiduMap = mapView.getMap();
        tv_Lat = findViewById(R.id.tv_Lat);
        tv_Lon = findViewById(R.id.tv_Lon);
        tv_Add = findViewById(R.id.tv_Add);

        LocationClientOption option = new LocationClientOption();
        //设置扫描时间间隔
        option.setScanSpan(1000);
        //设置定位模式，三选一
        option.setLocationMode(LocationClientOption.LocationMode.Hight_Accuracy);
        /*option.setLocationMode(LocationClientOption.LocationMode.Battery_Saving);
        option.setLocationMode(LocationClientOption.LocationMode.Device_Sensors);*/
        //设置需要地址信息
        option.setIsNeedAddress(true);
        //保存定位参数
        mLocationClient.setLocOption(option);
    }
    //内部类，百度位置监听器
    private class MyLocationListener  implements BDLocationListener {
        @Override
        public void onReceiveLocation(BDLocation bdLocation) {
            tv_Lat.setText(bdLocation.getLatitude()+"");
            tv_Lon.setText(bdLocation.getLongitude()+"");
            tv_Add.setText(bdLocation.getAddrStr());
            if(bdLocation.getLocType()==BDLocation.TypeGpsLocation || bdLocation.getLocType()==BDLocation.TypeNetWorkLocation){
                navigateTo(bdLocation);
            }
        }
    }
    private void navigateTo(BDLocation bdLocation) {
        if(isFirstLocate){
            LatLng ll = new LatLng(bdLocation.getLatitude(),bdLocation.getLongitude());
            MapStatusUpdate update = MapStatusUpdateFactory.newLatLng(ll);
            baiduMap.animateMapStatus(update);
            isFirstLocate = false;
        }
    }
    @Override
    protected void onResume() {
        super.onResume();
        mapView.onResume();
    }
    @Override
    protected void onPause() {
        super.onPause();
        mapView.onResume();
    }
    @Override
    protected void onDestroy() {
        super.onDestroy();
        mLocationClient.stop();
        mapView.onDestroy();
    }
}

三、结果展示