利用百度地图Android定位SDK获取经纬度

环境的搭建（参考上一次的文章）

百度地图Android定位SDK的使用

2．在Android studio里设计程序来获取经纬度

界面布局activity_main.xml文件的源代码：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="/apk/res/android"android:layout_width="fill_parent"android:layout_height="fill_parent"android:orientation="vertical" ><TextViewandroid:id="@+id/tv_loc_info"android:layout_width="fill_parent"android:layout_height="wrap_content"android:textSize="18sp" /><Buttonandroid:id="@+id/btn_start"android:layout_width="fill_parent"android:layout_height="wrap_content"android:layout_marginTop="520dp"android:text="Start" /></LinearLayout>

build.gradle(app)文件源代码：

apply plugin: 'com.android.application'android {compileSdkVersion 28buildToolsVersion "29.0.2"defaultConfig {applicationId "com.example.app"minSdkVersion 15targetSdkVersion 28multiDexEnabled trueversionCode 1versionName "1.0"testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"}sourceSets{main{jniLibs.srcDir 'libs'}}buildTypes {release {minifyEnabled falseproguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'}}}dependencies {implementation fileTree(dir: 'libs', include: ['*.jar'])implementation 'androidx.appcompat:appcompat:1.1.0'implementation 'androidx.constraintlayout:constraintlayout:1.1.3'testImplementation 'junit:junit:4.12'androidTestImplementation 'androidx.test.ext:junit:1.1.1'androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'implementation files('libs/BaiduLBS_Android.jar')implementation 'com.android.support:multidex:1.0.2'}

配置文件AndroidManifest.xml文件的源代码：

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="/apk/res/android"package="com.example.global_1"><applicationandroid:allowBackup="true"android:icon="@mipmap/ic_launcher"android:label="@string/app_name"android:roundIcon="@mipmap/ic_launcher_round"android:supportsRtl="true"android:theme="@style/AppTheme"><meta-dataandroid:name="com.baidu.lbsapi.API_KEY"android:value="AK" > 自己获取的AK码</meta-data><serviceandroid:name="com.baidu.location.f"android:enabled="true"android:permission="android.permission.BAIDU_LOCATION_SERVICE"android:process=":remote"><intent-filter><action android:name="com.baidu.location.service_v2.4" /></intent-filter></service><activity android:name=".MainActivity"><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.LAUNCHER" /></intent-filter></activity></application><uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/><!--获取设备网络状态，禁用后无法获取网络状态--><uses-permission android:name="android.permission.INTERNET"/><!--网络权限，当禁用后，无法进行检索等相关业务--><uses-permission android:name="android.permission.READ_PHONE_STATE" /><!--读取设备硬件信息，统计数据--><uses-permission android:name="com.android.launcher.permission.READ_SETTINGS" /><!--读取系统信息，包含系统版本等信息，用作统计--><uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /><!--获取设备的网络状态，鉴权所需网络代理--><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/><!--允许sd卡写权限，需写入地图数据，禁用后无法显示地图--><uses-permission android:name="android.permission.CAMERA" /><!--使用步行AR导航，配置Camera权限--><uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /><uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /><permission android:name="android.permission.BAIDU_LOCATION_SERVICE" /><uses-permission android:name="android.permission.BAIDU_LOCATION_SERVICE" /><uses-permission android:name="android.permission.CHANGE_WIFI_STATE" /></manifest>

主线程文件MainActivity.java文件的源代码：

package com.example.global_1;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.TextView;import com.baidu.location.BDLocation;import com.baidu.location.BDLocationListener;import com.baidu.location.LocationClient;import com.baidu.location.LocationClientOption;public class MainActivity extends Activity {private TextView locationInfoTextView = null;private Button startButton = null;private LocationClient locationClient = null;private static final int UPDATE_TIME = 5000;private static int LOCATION_COUTNS = 0;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);locationInfoTextView = (TextView) this.findViewById(R.id.tv_loc_info);startButton = (Button) this.findViewById(R.id.btn_start);locationClient = new LocationClient(this);//设置定位条件LocationClientOption option = new LocationClientOption();option.setOpenGps(true);//是否打开GPSoption.setCoorType("bd09ll");//可选，设置返回经纬度坐标类型，默认GCJ02//GCJ02：国测局坐标；//BD09ll：百度经纬度坐标；//BD09：百度墨卡托坐标；//海外地区定位，无需设置坐标类型，统一返回WGS84类型坐标option.setPriority(WorkFirst);//设置定位优先级option.setProdName("LocationDemo");//设置产品线名称option.setScanSpan(UPDATE_TIME);//设置定时定位的时间间隔。单位毫秒locationClient.setLocOption(option);//注册位置监听器locationClient.registerLocationListener(new BDLocationListener() {@Overridepublic void onReceiveLocation(BDLocation location) {if (location == null) {return;}StringBuffer sb = new StringBuffer(256);sb.append("Time : ");sb.append(location.getTime());//获取定位时间sb.append("\nError code : ");sb.append(location.getLocType());//获取类型sb.append("\nLatitude : ");sb.append(location.getLatitude());//获取纬度信息sb.append("\nLontitude : ");sb.append(location.getLongitude());//获取经度信息sb.append("\nRadius : ");sb.append(location.getRadius());//获取定位精准度if (location.getLocType() == BDLocation.TypeGpsLocation) {sb.append("\nSpeed : ");sb.append(location.getSpeed());sb.append("\nSatellite : ");sb.append(location.getSatelliteNumber());} else if (location.getLocType() == BDLocation.TypeNetWorkLocation) {sb.append("\nAddress : ");sb.append(location.getAddrStr());}LOCATION_COUTNS++;sb.append("\n检查位置更新次数：");sb.append(String.valueOf(LOCATION_COUTNS));locationInfoTextView.setText(sb.toString());}});startButton.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {if (locationClient == null) {return;}if (locationClient.isStarted()) {startButton.setText("Start");locationClient.stop();}else {startButton.setText("Stop");locationClient.start();locationClient.requestLocation();}}});}@Overrideprotected void onDestroy() {super.onDestroy();if (locationClient != null && locationClient.isStarted()) {locationClient.stop();locationClient = null;}}}

运行结果：

点击START后进入监听状态，进行位置的更新

点击STOP后停止位置的更新

百度地图开放平台链接