知识:
百度API中提供BaiMap类,是地图的总控制器。
定位到我的位置过程:
1 获取BaiduMap实例
BaiduMap baiduMap = mapView.getMap();
2 设置百度地图的缩放范围(值越大,百度地图显示的信息越精确)
MapStatusUpdate update = MapStatusUpdateFactory.zoomTo(12.5f);
baiduMap.animateMapStatus(update);
3 定位经纬度,使用LatLang
LatLang ll = new LatLng(39.915,11.404);
MapStatusUpdate update = MapStatusUpdateFactory.newLatLng(ll);baiduMap.animateMapStatus(update);
百度地图api的引入(AndroidStutio):
package com.example.baidumaptest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Build;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;
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.model.LatLng;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private MapView mMapView;
private BaiduMap baiduMap;
private LocationManager locationManager;
private String provider;
private boolean isFirstLocate = true ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//在使用SDK各组件之前初始化context信息,传入ApplicationContext
//注意该方法要再setContentView方法之前实现
SDKInitializer.initialize(getApplicationContext());
setContentView(R.layout.activity_main);
//获取地图控件引用
mMapView = (MapView) findViewById(R.id.bmapView);
baiduMap = mMapView.getMap();
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
List<String> providerList = locationManager.getProviders(true);//表示只有位置提供器才会被返回
// if(providerList.contains(LocationManager.GPS_PROVIDER)){
// provider = LocationManager.GPS_PROVIDER; //手机gps已坏,无法测试,所以注释
// }else
if(providerList.contains(LocationManager.NETWORK_PROVIDER)){
provider = LocationManager.NETWORK_PROVIDER;
}else {
Toast.makeText(this , "No location provider to use",Toast.LENGTH_SHORT).show();
return;
}
if ( Build.VERSION.SDK_INT >= 23 &&
ContextCompat.checkSelfPermission( this, android.Manifest.permission.ACCESS_FINE_LOCATION ) != PackageManager.PERMISSION_GRANTED &&
ContextCompat.checkSelfPermission( this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return ;
}
Location location = locationManager.getLastKnownLocation(provider);
if(location != null){
navigateTo(location);
}
locationManager.requestLocationUpdates(provider , 5000 , 1,locationListener);
}
private void navigateTo(Location location){
if (isFirstLocate){//isFirstLocate使用为了防止多次调用animate(),只需要开始定位的时候调用一次就行了
// String currentPosition = "latitude is " +location.getLatitude()+"\n"+"longitude is"+ location.getLongitude();
// System.out.println(currentPosition);
LatLng ll = new LatLng(location.getLatitude(),location.getLongitude());
MapStatusUpdate update = MapStatusUpdateFactory.newLatLng(ll);
baiduMap.animateMapStatus(update);
update = MapStatusUpdateFactory.zoomTo(16f);
baiduMap.animateMapStatus(update);
isFirstLocate = false ;
}
}
LocationListener locationListener = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
//更新当前的位置信息
if(location!=null){
navigateTo(location);
}
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
};
@Override
protected void onDestroy() {
super.onDestroy();
//在activity执行onDestroy时执行mMapView.onDestroy(),实现地图生命周期管理
mMapView.onDestroy();
if (locationManager!=null){
//关闭程序时将监听器移除
locationManager.removeUpdates(locationListener);
}
}
@Override
protected void onResume() {
super.onResume();
//在activity执行onResume时执行mMapView. onResume (),实现地图生命周期管理
mMapView.onResume();
}
@Override
protected void onPause() {
super.onPause();
//在activity执行onPause时执行mMapView. onPause (),实现地图生命周期管理
mMapView.onPause();
}
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<com.baidu.mapapi.map.MapView
android:id="@+id/bmapView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:clickable="true" />
</LinearLayout>