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！