上一篇我们学习了百度地图最基础的内容(申请Key和配置初览显示地图),今天继续来看一下基于Fragment的地图框架的使用。
Fragment的使用现在安卓APP开发中用的比较多了,Fragment名称为碎片和Activity有着相似的生命管理周期,基本作用可以进行开发兼容手机和平板的app,较少兼容分辨率版本的工作量,提高工作效率。其中Fragment还是可以包含控制代码的视图模块,可以非常方便的进行组合。使用起来很方便。具体有个Fragment的介绍和使用请点击查看(官网Fragment的介绍和基本使用),这边就不多讲了。下面我们来看下百度地图API给我们提供的地图框架SupportMapFragment。SupportMapFragment是继承于Fragment因此具备Fragment的完成的生命周期,该框架主要用来管理地图生命周期,主要有下面两个方法1:getMapView():获取MapView引用,要在onCreateView函数调用之后进行使用.2:newInstance();返回获取SupportMapFragment对象实例。
使用方法和我们平时用Fragment的时候差不多,首先获取SupportMapFragment实例,然后把该Fragment添加到指定View视图图.commit一下即可.
1.自定义MyApplication.java设置全局变量,并且进行校验密钥:
package com.ztt.baidumap.ui; import android.app.Application; import android.content.Context; import android.util.Log; import android.widget.Toast; import com.baidu.mapapi.BMapManager; import com.baidu.mapapi.MKGeneralListener; import com.baidu.mapapi.map.MKEvent; /** * 自定义Application,进行key识别验证 (使用单例) * @author Jiangqq * @time 2014/03/15 10:14 */ public class MyApplication extends Application { public static MyApplication instance=null; BMapManager mBMapManager = null; public boolean m_bKeyRight = true; public static final String strKey = "vUAGbPwLpolIqiwWisnQPeIE"; //百度地图官网申请的密钥 public static MyApplication getInstance(){ return instance; } @Override public void onCreate() { super.onCreate(); instance=this; //在APP应用启动的时候,进行初始化验证 initEngineManager(this); } /** * 进行验证key * @param pContext */ private void initEngineManager(Context pContext) { if (mBMapManager == null) { mBMapManager = new BMapManager(pContext); } if (!mBMapManager.init(strKey,new MyGeneralListener())) { Toast.makeText(MyApplication.getInstance(), "BMapManager 初始化错误!", Toast.LENGTH_LONG).show(); } } // 常用事件监听,用来处理通常的网络错误,授权验证错误等 static class MyGeneralListener implements MKGeneralListener { @Override public void onGetNetworkState(int iError) { if (iError == MKEvent.ERROR_NETWORK_CONNECT) { Toast.makeText(MyApplication.getInstance(), "您的网络出错啦!", Toast.LENGTH_LONG).show(); } else if (iError == MKEvent.ERROR_NETWORK_DATA) { Toast.makeText(MyApplication.getInstance(), "输入正确的检索条件!", Toast.LENGTH_LONG).show(); }else { Log.d("zttjiangqq", "iError="+iError); } // ... } @Override public void onGetPermissionState(int iError) { //非零值表示key验证未通过 if (iError != 0) { //授权Key错误: Toast.makeText(MyApplication.getInstance(), "请在 DemoApplication.java文件输入正确的授权Key,并检查您的网络连接是否正常!error: "+iError, Toast.LENGTH_LONG).show(); MyApplication.getInstance().m_bKeyRight = false; } else{ MyApplication.getInstance().m_bKeyRight = true; Toast.makeText(MyApplication.getInstance(), "key认证成功", Toast.LENGTH_LONG).show(); } } } }
2:创建一个FragmentMapDemo.java,继承于FragmentActivity,使用newInstance()方法获取SupportMapFragment,进行显示地图:
package com.ztt.baidumap.ui; import android.content.res.Configuration; import android.os.Bundle; import android.support.v4.app.FragmentActivity; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentTransaction; import android.util.Log; import com.baidu.mapapi.BMapManager; import com.baidu.mapapi.map.MapController; import com.baidu.mapapi.map.SupportMapFragment; import com.baidu.platform.comapi.basestruct.GeoPoint; public class FragmentMapDemo extends FragmentActivity { SupportMapFragment map; @Override public void onCreate(Bundle arg0) { /** * 使用地图sdk前需先初始化BMapManager. * BMapManager是全局的,可为多个MapView共用,它需要地图模块创建前创建, * 并在地图地图模块销毁后销毁,只要还有地图模块在使用,BMapManager就不应该销毁 */ MyApplication app = (MyApplication)this.getApplication(); if (app.mBMapManager == null) { app.mBMapManager = new BMapManager(getApplicationContext()); /** * 如果BMapManager没有初始化则初始化BMapManager */ app.mBMapManager.init(MyApplication.strKey,new MyApplication.MyGeneralListener()); } Log.d("zttjiangqq", "onCreate"); setContentView(R.layout.activity_fragment); map = SupportMapFragment.newInstance(); FragmentManager manager = getSupportFragmentManager(); FragmentTransaction ft= manager.beginTransaction(); ft.add(R.id.map, map, "map_fragment"); ft.commit(); } @Override protected void onRestoreInstanceState(Bundle savedInstanceState) { super.onRestoreInstanceState(savedInstanceState); Log.d("zttjiangqq", "onRestoreInstanceState"); } @Override protected void onRestart() { super.onRestart(); Log.d("zttjiangqq", "onRestart"); } @Override public void onStart() { super.onStart(); Log.d("zttjiangqq", "onStart"); } @Override public void onResume() { super.onResume(); Log.d("zttjiangqq", "onResume"); // 得到MapView的控制权,可以用它控制和驱动平移和缩放 MapController controller = map.getMapView().getController(); // 用给定的经纬度构造一个GeoPoint,单位是微度 (度 * 1E6) 并且设置设置地图中心点 (这边使用天安门) controller.setCenter(new GeoPoint((int)(39.945 * 1E6), (int)(116.404 * 1E6))); // 设置地图zoom级别 controller.setZoom(13); } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); Log.d("zttjiangqq", "onSaveInstanceState"); } @Override public void onPause() { super.onPause(); Log.d("zttjiangqq", "onPause"); } @Override public void onStop() { super.onStop(); Log.d("zttjiangqq", "onStop"); } @Override public void onDestroy() { super.onDestroy(); Log.d("zttjiangqq", "onDestory"); } @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); Log.d("zttjiangqq", "onConfigurationChanged"); } }
3:布局文件:
<?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" > <FrameLayout android:id="@+id/map" android:layout_width="match_parent" android:layout_height="match_parent" /> </LinearLayout>
(三)注意一定要添加配置权限
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" /> <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.ACCES_MOCK_LOCATION" /> <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" /> <!-- SDK1.5需要android.permission.GET_TASKS权限判断本程序是否为当前运行的应用? --> <uses-permission android:name="android.permission.GET_TASKS" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <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" /> <uses-permission android:name="android.permission.RECORD_AUDIO" />