Android学习笔记—— 十五 、基于位置的服务

因为谷歌的定位API无法使用，所以使用百度地图的API：百度地图开放平台

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1. 注册和获取**

• 官方教程：注册和获取**

2. 下载百度地图开放平台的SDK

• 下载位置：Android 地图 SDK

• 下载及配置SDK参考官方教程：Android Studio工程配置

3. Android Studio的相关配置流程

• 官方教程：Android Studio配置

4. 基本使用方法

参考官方文档（因为我尝试了一下写总结，结果发现怎么写都不如看官方文档 ×_× ）：!

PS：运行时权限处理同时申请多种权限的一种方法

		//运行时权限处理，同时进行多个运行时权限处理的一种方法
        List<String> permissionList = new ArrayList<>();
        if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            permissionList.add(Manifest.permission.ACCESS_FINE_LOCATION);
        }
        if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            permissionList.add(Manifest.permission.WRITE_EXTERNAL_STORAGE);
        }
        if (!permissionList.isEmpty()) {
            String[] permission = permissionList.toArray(new String[permissionList.size()]);
            ActivityCompat.requestPermissions(MainActivity.this, permission, 1);
        } else {
            requestLocation();
        }

练习的示例

public class MainActivity extends AppCompatActivity {

    public LocationClient locationClient;

    public LocationClientOption locationClientOption;

    private TextView tv_showLocation;

    private MapView mapView;

    private BaiduMap baiduMap;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //初始化MapView，而且必须书写在setContentView方法之前，否则会报错
        SDKInitializer.initialize(getApplicationContext());
        setContentView(R.layout.activity_main);

        tv_showLocation = findViewById(R.id.tv_showLocation);

        mapView = findViewById(R.id.mapView);

        //初始化LocationClient类
        locationClient = new LocationClient(getApplicationContext());
        locationClient.registerLocationListener(new MyLocationListener());

        //配置定位选项
        locationClientOption = new LocationClientOption();
        //设置两次定位间隔时间，单位为毫秒
        locationClientOption.setScanSpan(5000);
        //允许使用GPS
        locationClientOption.setOpenGps(true);
        //设置需要获取地址信息
        locationClientOption.setIsNeedAddress(true);
        //允许模拟的GPS，否则模拟器无法显示经纬度
        locationClientOption.setEnableSimulateGps(true);
        //加载设置
        locationClient.setLocOption(locationClientOption);


        //设置缩放程度
        baiduMap = mapView.getMap();
        MapStatusUpdate update = MapStatusUpdateFactory.zoomBy(3.5f);
        baiduMap.animateMapStatus(update);

        //设置mapView显示当前所在位置的蓝点
        baiduMap.setMyLocationEnabled(true);

        //运行时权限处理
        List<String> permissionList = new ArrayList<>();
        if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            permissionList.add(Manifest.permission.ACCESS_FINE_LOCATION);
        }
        if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            permissionList.add(Manifest.permission.WRITE_EXTERNAL_STORAGE);
        }
        if (!permissionList.isEmpty()) {
            String[] permission = permissionList.toArray(new String[permissionList.size()]);
            ActivityCompat.requestPermissions(MainActivity.this, permission, 1);
        } else {
            requestLocation();
        }
    }

    //自定义方法，启动定位
    private void requestLocation() {
        locationClient.start();
    }

    //运行时权限结果处理
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        if (requestCode == 1) {
            if (grantResults.length > 0) {
                for (int result : grantResults) {
                    if (result != PackageManager.PERMISSION_GRANTED) {
                        Toast.makeText(this, "必须同意所有权限才可以使用本程序", Toast.LENGTH_SHORT).show();
                        finish();
                        return;
                    }
                    locationClient.restart();
                }
                requestLocation();
            } else {
                Toast.makeText(this, "Unknown Error! ", Toast.LENGTH_SHORT).show();
                finish();
            }
        }
    }

    public class MyLocationListener extends BDAbstractLocationListener {

        @Override
        public void onReceiveLocation(BDLocation bdLocation) {

            //将地图设置为以当前位置为中心
            LatLng ll = new LatLng(bdLocation.getLatitude(), bdLocation.getLongitude());
            MapStatusUpdate update = MapStatusUpdateFactory.newLatLng(ll);
            baiduMap.animateMapStatus(update);

            //更新蓝点的位置
            MyLocationData locationData = new MyLocationData.Builder()
                    .accuracy(bdLocation.getRadius())
                    .direction(bdLocation.getDirection())
                    .latitude(bdLocation.getLatitude())
                    .longitude(bdLocation.getLongitude())
                    .build();
            baiduMap.setMyLocationData(locationData);

            //获取经纬度和地址信息
            StringBuilder currentPosition = new StringBuilder();
            currentPosition.append("纬度：").append(bdLocation.getLatitude()).append("\n")
                    .append("经度：").append(bdLocation.getLongitude()).append("\n")
                    .append("国家：").append(bdLocation.getCountry()).append("\n")
                    .append("省：").append(bdLocation.getProvince()).append("\n")
                    .append("城市：").append(bdLocation.getCity()).append("\n")
                    .append("区：").append(bdLocation.getDistrict()).append("\n")
                    .append("街道：").append(bdLocation.getStreet()).append("\n")
                    .append("定位方式：");
            if (bdLocation.getLocType() == BDLocation.TypeGpsLocation) {
                currentPosition.append("GPS");
            } else if (bdLocation.getLocType() == BDLocation.TypeNetWorkLocation) {
                currentPosition.append("Network");
            } else {
                //如果不是以上定位方式，显示定位方式代码并和官方文档对照检查问题
                currentPosition.append(bdLocation.getLocType()).append("  定位类型未知或定位出错！");
            }
            tv_showLocation.setText(currentPosition);
        }
    }

    @Override
    protected void onResume() {
        super.onResume();
        mapView.onResume();
    }

    @Override
    protected void onPause() {
        super.onPause();
        mapView.onPause();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();

        //关闭蓝点显示，停止定位，销毁mapView
        baiduMap.setMyLocationEnabled(false);
        locationClient.stop();
        mapView.onDestroy();
    }
}