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Android实现APP版本自动更新功能

2023-10-27
Android实现APP自动更新功能

现在一般的android软件都是需要不断更新的，当你打开某个app的时候，如果有新的版本，它会提示你有新版本需要更新。该小程序实现的就是这个功能。

该小程序的特点是，当有更新时，会弹出一个提示框，点击确定，则在通知来创建一个进度条进行下载，点击取消，则取消更新。

以下是详细代码:

1.创建布局文件notification_item.xml，用于在通知栏生成一个进度条和下载图标。

 

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<relativelayout android:layout_height= "fill_parent" android:layout_width= "fill_parent" android:padding= "3dp" xmlns:android= "http://schemas.android.com/apk/res/android" ><imageview android:id= "@+id/notificationImage" android:layout_height= "wrap_content" android:layout_width= "wrap_content" android:src= "@android:drawable/stat_sys_download" ><textview android:id= "@+id/notificationTitle" android:layout_alignparentright= "true" android:layout_height= "wrap_content" android:layout_torightof= "@id/notificationImage" android:layout_width= "wrap_content" android:paddingleft= "6dp" android:textcolor= "#FF000000" ><textview android:id= "@+id/notificationPercent" android:layout_below= "@id/notificationImage" android:layout_height= "wrap_content" android:layout_width= "wrap_content" android:paddingtop= "2dp" android:textcolor= "#FF000000" >
 
     <progressbar android:id= "@+id/notificationProgress" android:layout_alignleft= "@id/notificationTitle" android:layout_alignparentright= "true" android:layout_aligntop= "@id/notificationPercent" android:layout_below= "@id/notificationTitle" android:layout_height= "wrap_content" android:layout_width= "wrap_content" android:paddingleft= "6dp" android:paddingright= "3dp" android:paddingtop= "2dp" style= "@style/ProgressBarHorizontal_color" >
 
</progressbar></textview></textview></imageview></relativelayout>

2.创建AppContext类，该类继承自Application。

 

 

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package com.test.application;
 
import android.app.Application;
import android.content.Context;
 
import com.test.update.config.Config;
 
public class AppContext extends Application {
     private static AppContext appInstance;
     private Context context;
 
     public static AppContext getInstance() {
         return appInstance;
     }
 
     @Override
     public void onCreate() {
         // TODO Auto-generated method stub
         super .onCreate();
         appInstance = this ;
         context = this .getBaseContext();
//      // 获取当前版本号
//      try {
//          PackageInfo packageInfo = getApplicationContext()
//                  .getPackageManager().getPackageInfo(getPackageName(), 0);
//          Config.localVersion = packageInfo.versionCode;
//          Config.serverVersion = 1;// 假定服务器版本为2，本地版本默认是1
//      } catch (NameNotFoundException e) {
//          e.printStackTrace();
//      }
         initGlobal();
     }
 
     public void initGlobal() {
         try {
             Config.localVersion = getPackageManager().getPackageInfo(
                     getPackageName(), 0 ).versionCode; // 设置本地版本号
             Config.serverVersion = 2 ; // 假定服务器版本为2，本地版本默认是1--实际开发中是从服务器获取最新版本号，android具体与后端的交互见我另///外的博文
         } catch (Exception ex) {
             ex.printStackTrace();
         }
     }
}

3.创建配置文件类Config.java,在这个类里面定义一些与版本相关的常量

 

 

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package com.test.update.config;
 
public class Config {
     //版本信息
     public static int localVersion = 0 ;
     public static int serverVersion = 0 ;
     /* 下载包安装路径 */ 
     public static final String savePath = /sdcard/test/; 
   
     public static final String saveFileName = savePath + test.apk; 
}


 

4.编写更新服务类UpdateServcie.java

 

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package com.test.update;
 
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
 
import android.annotation.SuppressLint;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Intent;
import android.net.Uri;
import android.os.Environment;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.widget.RemoteViews;
 
import com.test.update.config.Config;
 
public class UpdateService extends Service {
     // 标题
     private int titleId = 0 ;
 
     // 文件存储
     private File updateDir = null ;
     private File updateFile = null ;
     // 下载状态
     private final static int DOWNLOAD_COMPLETE = 0 ;
     private final static int DOWNLOAD_FAIL = 1 ;
     // 通知栏
     private NotificationManager updateNotificationManager = null ;
     private Notification updateNotification = null ;
     // 通知栏跳转Intent
     private Intent updateIntent = null ;
     private PendingIntent updatePendingIntent = null ;
     /***
      * 创建通知栏
      */
     RemoteViews contentView;
     // 这样的下载代码很多，我就不做过多的说明
     int downloadCount = 0 ;
     int currentSize = 0 ;
     long totalSize = 0 ;
     int updateTotalSize = 0 ;
 
     // 在onStartCommand()方法中准备相关的下载工作：
     @SuppressWarnings (deprecation)
     @Override
     public int onStartCommand(Intent intent, int flags, int startId) {
         // 获取传值
         titleId = intent.getIntExtra(titleId, 0 );
         // 创建文件
         if (android.os.Environment.MEDIA_MOUNTED.equals(android.os.Environment
                 .getExternalStorageState())) {
             updateDir = new File(Environment.getExternalStorageDirectory(),
                     Config.saveFileName);
             updateFile = new File(updateDir.getPath(), getResources()
                     .getString(titleId) + .apk);
         }
 
         this .updateNotificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
         this .updateNotification = new Notification();
 
         // 设置下载过程中，点击通知栏，回到主界面
         updateIntent = new Intent( this , UpdateActivity. class );
         updatePendingIntent = PendingIntent.getActivity( this , 0 , updateIntent,
                 0 );
         // 设置通知栏显示内容
         updateNotification.icon = R.drawable.ic_launcher;
         updateNotification.tickerText = 开始下载;
         updateNotification.setLatestEventInfo( this , QQ, 0 %,
                 updatePendingIntent);
         // 发出通知
         updateNotificationManager.notify( 0 , updateNotification);
 
         // 开启一个新的线程下载，如果使用Service同步下载，会导致ANR问题，Service本身也会阻塞
         new Thread( new updateRunnable()).start(); // 这个是下载的重点，是下载的过程
 
         return super .onStartCommand(intent, flags, startId);
     }
 
     @Override
     public IBinder onBind(Intent arg0) {
         // TODO Auto-generated method stub
         return null ;
     }
 
     @SuppressLint (HandlerLeak)
     private Handler updateHandler = new Handler() {
         @Override
         public void handleMessage(Message msg) {
             switch (msg.what) {
                 
             case DOWNLOAD_COMPLETE:
                 // 点击安装PendingIntent
                 Uri uri = Uri.fromFile(updateFile);
                 Intent installIntent = new Intent(Intent.ACTION_VIEW);
                 installIntent.setDataAndType(uri,
                         application/vnd.android. package -archive);
 
                 updatePendingIntent = PendingIntent.getActivity(
                         UpdateService. this , 0 , installIntent, 0 );
 
                 updateNotification.defaults = Notification.DEFAULT_SOUND; // 铃声提醒
                 updateNotification.setLatestEventInfo(UpdateService. this ,
                         QQ, 下载完成,点击安装。, updatePendingIntent);
                 updateNotificationManager.notify( 0 , updateNotification);
 
                 // 停止服务
                 stopService(updateIntent);
             case DOWNLOAD_FAIL:
                 // 下载失败
                 updateNotification.setLatestEventInfo(UpdateService. this ,
                         QQ, 下载完成,点击安装。, updatePendingIntent);
                 updateNotificationManager.notify( 0 , updateNotification);
             default :
                 stopService(updateIntent);
             }
         }
     };
 
     public long downloadUpdateFile(String downloadUrl, File saveFile)
             throws Exception {
 
         HttpURLConnection httpConnection = null ;
         InputStream is = null ;
         FileOutputStream fos = null ;
 
         try {
             URL url = new URL(downloadUrl);
             httpConnection = (HttpURLConnection) url.openConnection();
             httpConnection
                     .setRequestProperty(User-Agent, PacificHttpClient);
             if (currentSize > 0 ) {
                 httpConnection.setRequestProperty(RANGE, bytes=
                         + currentSize + -);
             }
             httpConnection.setConnectTimeout( 10000 );
             httpConnection.setReadTimeout( 20000 );
             updateTotalSize = httpConnection.getContentLength();
             if (httpConnection.getResponseCode() == 404 ) {
                 throw new Exception(fail!);
             }
             is = httpConnection.getInputStream();
             fos = new FileOutputStream(saveFile, false );
             byte buffer[] = new byte [ 4096 ];
             int readsize = 0 ;
             while ((readsize = is.read(buffer)) > 0 ) {
                 fos.write(buffer, 0 , readsize);
                 totalSize += readsize;
                 // 为了防止频繁的通知导致应用吃紧，百分比增加10才通知一次
                 if ((downloadCount == 0 )
                         || ( int ) (totalSize * 100 / updateTotalSize) - 10 > downloadCount) {
                     downloadCount += 10 ;
 
                     updateNotification.setLatestEventInfo(UpdateService. this ,
                             正在下载, ( int ) totalSize * 100 / updateTotalSize
                                     + %, updatePendingIntent);
 
                     
                     /***
                      * 在这里我们用自定的view来显示Notification
                      */
                     updateNotification.contentView = new RemoteViews(
                             getPackageName(), R.layout.notification_item);
                     updateNotification.contentView.setTextViewText(
                             R.id.notificationTitle, 正在下载);
                     updateNotification.contentView.setProgressBar(
                             R.id.notificationProgress, 100 , downloadCount, false );
                     
                     updateNotificationManager.notify( 0 , updateNotification);
                 }
             }
         } finally {
             if (httpConnection != null ) {
                 httpConnection.disconnect();
             }
             if (is != null ) {
                 is.close();
             }
             if (fos != null ) {
                 fos.close();
             }
         }
         return totalSize;
     }
 
     class updateRunnable implements Runnable {
         Message message = updateHandler.obtainMessage();
 
         public void run() {
             message.what = DOWNLOAD_COMPLETE;
             
             
             try {
                 // 增加权限<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE">;
                 if (!updateDir.exists()) {
                     updateDir.mkdirs();
                 }
                 if (!updateFile.exists()) {
                     updateFile.createNewFile();
                 }
                 // 下载函数，以QQ为例子
                 // 增加权限<uses-permission android:name="android.permission.INTERNET">;
                 long downloadSize = downloadUpdateFile(
                         http: //softfile.3g.qq.com:8080/msoft/179/1105/10753/MobileQQ1.0(Android)_Build0198.apk,
                         updateFile);
                 if (downloadSize > 0 ) {
                     // 下载成功
                     updateHandler.sendMessage(message);
                 }
             } catch (Exception ex) {
                 ex.printStackTrace();
                 message.what = DOWNLOAD_FAIL;
                 // 下载失败
                 updateHandler.sendMessage(message);
             }
         }
     }
}
</uses-permission></uses-permission>

5.编写活动类UpdateActivity

 

 

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package com.test.update;
 
import com.test.update.config.Config;
 
import android.support.v4.app.Fragment;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
 
public class UpdateActivity extends Activity {
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super .onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         checkVersion();
     }
 
     /**
      * 检查更新版本
      */
     public void checkVersion() {
 
         if (Config.localVersion < Config.serverVersion) {
             Log.i(hgncxzy, ==============================);
             // 发现新版本，提示用户更新
             AlertDialog.Builder alert = new AlertDialog.Builder( this );
             alert.setTitle(软件升级)
                     .setMessage(发现新版本,建议立即更新使用.)
                     .setPositiveButton(更新,
                             new DialogInterface.OnClickListener() {
                                 public void onClick(DialogInterface dialog,
                                         int which) {
                                     // 开启更新服务UpdateService
                                     // 这里为了把update更好模块化，可以传一些updateService依赖的值
                                     // 如布局ID，资源ID，动态获取的标题,这里以app_name为例
                                     Intent updateIntent = new Intent(
                                             UpdateActivity. this ,
                                             UpdateService. class );
                                     updateIntent.putExtra(titleId,
                                             R.string.app_name);
                                     startService(updateIntent);
                                 }
                             })
                     .setNegativeButton(取消,
                             new DialogInterface.OnClickListener() {
                                 public void onClick(DialogInterface dialog,
                                         int which) {
                                     dialog.dismiss();
                                 }
                             });
             alert.create().show();
         } else {
             // 清理工作，略去
             // cheanUpdateFile()
         }
     }
}

6.添加权限以及将服务静态加载(在配置文件中加载)。
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