定位到我的位置（BaiduMap）

来源：互联网发布：centos 7 卡在进度条编辑：程序博客网时间：2024/04/30 10:51

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）：
这里写图片描述

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>

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