博客

一、题目

Android 在百度地图上显示自己的实时位置

二、环境

Android Studio

三、代码实现

在使用下面代码之前，需要导入百度地图的包和AK吗。

可以去百度地图开发的开发文档寻找自己需要的部分，文档有教怎样申请AK和导入百度地图的包。

百度地图开发页面


点击这里可以直达开发页面。

package com.example.children;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

import android.Manifest;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.widget.TextView;
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.SDKInitializer;
import com.baidu.mapapi.map.BaiduMap;
import com.baidu.mapapi.map.MapStatusUpdate;
import com.baidu.mapapi.map.MapStatusUpdateFactory;
import com.baidu.mapapi.map.MapView;
import com.baidu.mapapi.map.MyLocationData;
import com.baidu.mapapi.model.LatLng;
import com.example.children.MenuActivity;
import com.example.children.R;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {
    TextView locationInfo;
    LocationClient mLocationClient;
    MapView mMapView;
    BaiduMap mBaiduMap = null;
    boolean isFirstLocate = true;
//     当前定位模式
//    private MyLocationConfiguration.LocationMode locationMode;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //此方法要再setContentView方法之前实现
        SDKInitializer.initialize(getApplicationContext());
        setContentView(R.layout.activity_main);
        locationInfo = findViewById(R.id.locationInfo);

        mLocationClient = new LocationClient((getApplicationContext()));
        mLocationClient.registerLocationListener(new MyLocationListener());

        //获取地图控件引用
        mMapView = findViewById(R.id.bmapView);
        // 得到地图
        mBaiduMap = mMapView.getMap();
        // 开启定位图层
        mBaiduMap.setMyLocationEnabled(true);
        //定位初始化
        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.setScanSpan(1000);
        // 可选，设置地址信息
        option.setIsNeedAddress(true);
        //可选，设置是否需要地址描述
        option.setIsNeedLocationDescribe(true);

        //设置locationClientOption
        mLocationClient.setLocOption(option);

        //注册LocationListener监听器
        MyLocationListener myLocationListener = new MyLocationListener();
        mLocationClient.registerLocationListener(myLocationListener);

        List<String> permissionList = new ArrayList<>();
        //如果没有启动下面权限，就询问用户让用户打开
        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.READ_PHONE_STATE) != PackageManager.PERMISSION_GRANTED) {
            permissionList.add(Manifest.permission.READ_PHONE_STATE);
        }
        if (ContextCompat.checkSelfPermission(MainActivity.this,
                Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            permissionList.add(Manifest.permission.WRITE_EXTERNAL_STORAGE);
        }
        if (!permissionList.isEmpty()) {
            String[] permissions = permissionList.toArray(new String[permissionList.size()]);
            ActivityCompat.requestPermissions(MainActivity.this, permissions, 1);
        } else {
            requestLocation();
        }
    }

    /*只有同意打开相关权限才可以开启本程序*/
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        switch (requestCode) {
            case 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能使用本程序", Toast.LENGTH_SHORT).show();
                            finish();
                            return;
                        }
                    }
                    requestLocation();
                } else {
                    Toast.makeText(this, "发生未知错误", Toast.LENGTH_SHORT).show();
                    finish();
                }
                break;
            default:
        }
    }

    private void requestLocation() {
        initLocation();
        mLocationClient.start();
    }

    private void initLocation() {
        LocationClientOption option = new LocationClientOption();
        option.setLocationMode(LocationClientOption.LocationMode.Hight_Accuracy);
        option.setCoorType("bd09ll");
        option.setScanSpan(3000);//发起定位请求的间隔
        option.setOpenGps(true);
        option.setLocationNotify(true);
        option.setIgnoreKillProcess(false);
        option.SetIgnoreCacheException(false);
        option.setWifiCacheTimeOut(5 * 60 * 1000);
        option.setEnableSimulateGps(false);
        option.setIsNeedAddress(true);
        mLocationClient.setLocOption(option);
    }

    private class MyLocationListener extends BDAbstractLocationListener {
        @Override
        public void onReceiveLocation(BDLocation location) {
            navigateTo(location);
            StringBuilder currentPosition = new StringBuilder();
            currentPosition.append("纬度：").append(location.getLatitude()).append("\n");
            currentPosition.append("经线：").append(location.getLongitude()).append("\n");
            currentPosition.append("国家：").append(location.getCountry()).append("\n");
            currentPosition.append("省：").append(location.getProvince()).append("\n");
            currentPosition.append("市：").append(location.getCity()).append("\n");
            currentPosition.append("区：").append(location.getDistrict()).append("\n");
            currentPosition.append("街道：").append(location.getStreet()).append("\n");
            currentPosition.append("定位方式：");
            if (location.getLocType() == BDLocation.TypeGpsLocation) {
                currentPosition.append("GPS");
            } else if (location.getLocType() == BDLocation.TypeNetWorkLocation) {
                currentPosition.append("网络");
            }
            locationInfo.setText(currentPosition);
        }
    }
    private void navigateTo(BDLocation location){
        if(isFirstLocate) {
            LatLng ll = new LatLng(location.getLatitude(), location.getLongitude());
            MapStatusUpdate update = MapStatusUpdateFactory.newLatLng(ll);
            mBaiduMap.animateMapStatus(update);
//        缩放地图大小
            update = MapStatusUpdateFactory.zoomTo(16f);
            mBaiduMap.animateMapStatus(update);
            isFirstLocate=false;
        }
        MyLocationData.Builder locationBuilder=new MyLocationData.Builder();
        locationBuilder.longitude(location.getLongitude());
        locationBuilder.latitude(location.getLatitude());
        MyLocationData locationData=locationBuilder.build();
        mBaiduMap.setMyLocationData(locationData);
    }
    @Override
    protected void onResume() {
        mMapView.onResume();
        super.onResume();
    }

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

    @Override
    protected void onDestroy() {
        super.onDestroy();
        mMapView.onDestroy();
        mBaiduMap.setMyLocationEnabled(false);
        mLocationClient.stop();
    }
}

四、实验结果

这是在我的手机vivox21的上实验的结果。

定位精度比较高，我使用时定位精度大概在1-10m。户外定位基本就是自己的位置，室内定位略差。

夜神模拟器上模拟的结果：

这是我今天运行的截图

之前我在做这个demo的时候，模拟器一直定位的是四川的某地方，范围基本在那个县，但是镇、村可能不同。今天定位的是湖北偏岳阳的某地方。

还有模拟器使用百度地图图层时，基本默认显示北京。

所以在做Android定位时最好用真机模拟

有问题，请留言交流！