Android开发学习之路--百度地图之初体验

    手机都有gps和网络，通过gps或者网络可以定位到自己，然后通过百度，腾讯啊之类的地图可以显示我们的地理位置。这里学习下百度地图的使用。首先就是要申请开发者了，这个详细就不多讲了。http://developer.baidu.com/map/wiki/index.php?title=androidsdk/guide/key。可以参考这里，详细介绍了怎么申请。

    然后创建应用，创建好了之后，如下所示：

    接着是下载百度的sdk了。http://lbsyun.baidu.com/index.php?title=androidsdk/sdkandev-download。一键下载即可，下载好后是v3.7.1版本，如下：

    之后需要把libs下的内容拷贝到项目中的。接着我们新建工程，emBaiduMapStudy。然后把上面libs下的jar包和文件夹下的so都拷贝到项目的libs目录下。修改build.gradle：

apply plugin: 'com.android.application'android {    compileSdkVersion 23    buildToolsVersion "23.0.2"    defaultConfig {        applicationId "com.jared.embaidumapstudy"        minSdkVersion 15        targetSdkVersion 23        versionCode 1        versionName "1.0"    }    buildTypes {        release {            minifyEnabled false            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'        }    }    sourceSets {        main {            jniLibs.srcDirs = ['libs']        }    }}dependencies {    compile fileTree(dir: 'libs', include: ['*.jar'])    testCompile 'junit:junit:4.12'    compile 'com.android.support:appcompat-v7:23.1.1'}

    这里添加了sourceSets。接着我们修改layout布局：

<?xml version="1.0" encoding="utf-8"?><LinearLayout    xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    android:layout_margin="5dp">    <TextView        android:text="Hello Baidu Map"        android:layout_gravity="center"        android:layout_margin="2dp"        android:layout_width="wrap_content"        android:layout_height="wrap_content" />    <com.baidu.mapapi.map.MapView        android:id="@+id/bmapView"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:clickable="true"/></LinearLayout>

    接着修改权限，修改AndroidManifest文件如下：

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.jared.embaidumapstudy" >    <permission android:name="android.permission.BAIDU_LOCATION_SERVICE" />    <uses-permission android:name="android.permission.BAIDU_LOCATION_SERVICE" />    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />    <uses-permission android:name="android.permission.INTERNET" />    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />    <uses-permission android:name="com.android.launcher.permission.READ_SETTINGS" />    <uses-permission android:name="android.permission.WAKE_LOCK" />    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />    <uses-permission android:name="android.permission.ACCESS_GPS" />    <uses-permission android:name="android.permission.READ_PHONE_STATE" />    <uses-permission android:name="android.permission.READ_CONTACTS" />    <uses-permission android:name="android.permission.CALL_PHONE" />    <uses-permission android:name="android.permission.READ_SMS" />    <uses-permission android:name="android.permission.SEND_SMS" />    <uses-permission android:name="android.permission.CAMERA" />    <uses-permission android:name="android.permission.RECORD_AUDIO" />    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />    <uses-permission android:name="android.permission.BROADCAST_STICKY" />    <uses-permission android:name="android.permission.WRITE_SETTINGS" />    <!-- 来电消音 -->    <uses-permission android:name="android.permission.PROCESS_OUTGOING_CALLS" />    <uses-permission android:name="android.permission.READ_PHONE_STATE" />    <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />    <application        android:name=".DemoApplication"        android:allowBackup="true"        android:icon="@mipmap/ic_launcher"        android:label="@string/app_name"        android:supportsRtl="true"        android:theme="@style/AppTheme" >        <meta-data            android:name="com.baidu.lbsapi.API_KEY"            android:value="lMYt4e8sq4jPE6GMGLwtra4z" />        <activity android:name=".MainActivity" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application></manifest>

    这里有一个比较恶心的，需要application的android:name属性。接着是各种权限，还有得加上meta-data的内容里的key，也就是上面申请的key了。因为有个android:name属性，所以需要新建类DemoApplication继承Application的。代码如下：

package com.jared.embaidumapstudy;/** * Created by jared on 16/2/20. */import android.app.Application;import com.baidu.mapapi.SDKInitializer;public class DemoApplication extends Application {    @Override    public void onCreate() {        super.onCreate();        SDKInitializer.initialize(this);    }}

    然后修改MainActivity代码如下：

package com.jared.embaidumapstudy;import android.app.Activity;import android.os.Bundle;import com.baidu.mapapi.map.BaiduMap;import com.baidu.mapapi.map.MapView;public class MainActivity extends Activity {    private MapView baiduMapView;    private BaiduMap mBaiduMap;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        baiduMapView = (MapView)findViewById(R.id.bmapView);        mBaiduMap = baiduMapView.getMap();    }    @Override    protected void onDestroy() {        super.onDestroy();        baiduMapView.onDestroy();    }    @Override    protected void onResume() {        super.onResume();        baiduMapView.onResume();    }    @Override    protected void onPause() {        super.onPause();        baiduMapView.onPause();    }}

    运行下看下效果如下：

    折腾了好久终于把百度地图搞出来了。既然地图有了，那接下来就是要定位了。下面来实现下定位的功能和自定义缩放。修改代码如下：

package com.jared.embaidumapstudy;import android.app.Activity;import android.content.Context;import android.location.Location;import android.location.LocationManager;import android.os.Bundle;import android.util.Log;import android.widget.Toast;import com.baidu.mapapi.map.BaiduMap;import com.baidu.mapapi.map.BitmapDescriptor;import com.baidu.mapapi.map.BitmapDescriptorFactory;import com.baidu.mapapi.map.MapStatusUpdate;import com.baidu.mapapi.map.MapStatusUpdateFactory;import com.baidu.mapapi.map.MapView;import com.baidu.mapapi.map.MyLocationConfiguration;import com.baidu.mapapi.map.MyLocationData;import java.util.List;public class MainActivity extends Activity {    private MapView baiduMapView;    private BaiduMap mBaiduMap;    private LocationManager locationManager;    private String provider;    BitmapDescriptor mCurrentMarker;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        baiduMapView = (MapView)findViewById(R.id.bmapView);        mBaiduMap = baiduMapView.getMap();        locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);        List<String> providerList = locationManager.getProviders(true);        if(providerList.contains(LocationManager.GPS_PROVIDER)) {            provider = LocationManager.GPS_PROVIDER;        } else if(providerList.contains(LocationManager.NETWORK_PROVIDER)) {            provider = LocationManager.NETWORK_PROVIDER;        } else {            Toast.makeText(getApplicationContext(), "No location provider to use",                    Toast.LENGTH_LONG).show();            return;        }        provider = LocationManager.NETWORK_PROVIDER;        Location location = locationManager.getLastKnownLocation(provider);        if(location != null) {            navigateTo(location);        }    }    private void navigateTo(Location location) {        // 开启定位图层        mBaiduMap.setMyLocationEnabled(true);        //.accuracy(location.getRadius())        MyLocationData locData = new MyLocationData.Builder()                .accuracy(location.getAccuracy())                // 此处设置开发者获取到的方向信息，顺时针0-360                .direction(100).latitude(location.getLatitude())                .longitude(location.getLongitude()).build();        Log.d("Location", String.valueOf(location.getLatitude())+":"                +String.valueOf(location.getLongitude()));        // 设置定位数据        mBaiduMap.setMyLocationData(locData);        // 设置定位图层的配置（定位模式，是否允许方向信息，用户自定义定位图标）        mCurrentMarker = BitmapDescriptorFactory                .fromResource(R.drawable.icon_geo);        MyLocationConfiguration config = new MyLocationConfiguration(                MyLocationConfiguration.LocationMode.FOLLOWING, true, mCurrentMarker);        mBaiduMap.setMyLocationConfigeration(config);        perfomZoom(15);    }    private void perfomZoom(int zoom) {        float zoomLevel = Float.parseFloat(String.valueOf(zoom));        MapStatusUpdate u = MapStatusUpdateFactory.zoomTo(zoomLevel);        mBaiduMap.animateMapStatus(u);    }    @Override    protected void onDestroy() {        super.onDestroy();        baiduMapView.onDestroy();    }    @Override    protected void onResume() {        super.onResume();        baiduMapView.onResume();    }    @Override    protected void onPause() {        super.onPause();        baiduMapView.onPause();    }}

    这里通过Location来获取位置，因为室内gps信号很弱，就用网络的位置了，接着就是用了BaiduMap接口设置位置，控制缩放了。这里添加了一个小圈圈表示位置，运行结果如下：

    如图已经很明显地显示了当前的位置。

    百度地图还有好多的内容可以学习，这里是初体验，就简单学习这些了。