利用百度地图Android定位SDK获取经纬度

1. 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="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/tv_loc_info"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textSize="18sp" />

    <Button
        android: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 28
    buildToolsVersion "29.0.2"
    defaultConfig {
        applicationId "com.example.app"
        minSdkVersion 15
        targetSdkVersion 28
        multiDexEnabled true
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    sourceSets{
        main{
            jniLibs.srcDir 'libs'
        }
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles 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="http://schemas.android.com/apk/res/android"
    package="com.example.global_1">

    <application
        android: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-data
            android:name="com.baidu.lbsapi.API_KEY"
            android:value="AK" > 自己获取的AK码
        </meta-data>

        <service

            android: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;

    @Override
    protected 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GPS
        option.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(LocationClientOption.NetWorkFirst);
        //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() {
            @Override
            public 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() {

            @Override
            public void onClick(View v) {
                if (locationClient == null) {
                    return;
                }
                if (locationClient.isStarted()) {
                    startButton.setText("Start");
                    locationClient.stop();
                }
                else {
                    startButton.setText("Stop");
                    locationClient.start();
                    locationClient.requestLocation();

                }
            }
        });
    }
    @Override
    protected 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