写在前面的话:
【百度地图开发之二】基于Fragment的地图框架的使用(博客地址:http://blog.csdn.net/developer_jiangqq),转载请注明。
Author:hmjiangqq
Email:jiangqqlmj@163.com
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。
(一)基本介绍(Fragment和SupportMapFragment):
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。
(二)使用方法:
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.
(三)代码演示,注释基本已经写了挺详细了,直接看就OK了
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*)
- 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" />