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。

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
 android:layout_width="fill_parent" 
 android:layout_height="fill_parent" 
 android:padding="3dp" > 
 
 <ImageView 
  android:id="@+id/notificationImage" 
  android:layout_width="wrap_content" 
  android:layout_height="wrap_content" 
  android:src="@android:drawable/stat_sys_download" /> 
 
 <TextView 
  android:id="@+id/notificationTitle" 
  android:layout_width="wrap_content" 
  android:layout_height="wrap_content" 
  android:layout_alignParentRight="true" 
  android:layout_toRightOf="@id/notificationImage" 
  android:paddingLeft="6dp" 
  android:textColor="#FF000000" /> 
 
 <TextView 
  android:id="@+id/notificationPercent" 
  android:layout_width="wrap_content" 
  android:layout_height="wrap_content" 
  android:layout_below="@id/notificationImage" 
  android:paddingTop="2dp" 
  android:textColor="#FF000000" /> 
 
 <ProgressBar 
  android:id="@+id/notificationProgress" 
  style="@style/ProgressBarHorizontal_color" 
  android:layout_width="wrap_content" 
  android:layout_height="wrap_content" 
  android:layout_alignLeft="@id/notificationTitle" 
  android:layout_alignParentRight="true" 
  android:layout_alignTop="@id/notificationPercent" 
  android:layout_below="@id/notificationTitle" 
  android:paddingLeft="6dp" 
  android:paddingRight="3dp" 
  android:paddingTop="2dp" /> 
 
</RelativeLayout> 

2.创建AppContext类，该类继承自Application。

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

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

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); 
   } 
  } 
 } 
} 

5.编写活动类UpdateActivity

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)。

<uses-permission android:name="android.permission.INTERNET" /> 
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> 
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" /> 

注册服务

<service android:name="com.test.update.UpdateService" > 
  </service>

完整的AndroidManifest.xml文件如下:

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
 package="com.test.update" 
 android:versionCode="1" 
 android:versionName="1.0" > 
 
 <uses-sdk 
  android:minSdkVersion="8" 
  android:targetSdkVersion="8" /> 
 
 <application 
  android:name="com.test.application.AppContext" 
  android:icon="@drawable/ic_launcher" 
  android:label="@string/app_name" > 
  <activity 
   android:name="com.test.update.UpdateActivity" 
   android:label="@string/app_name" > 
   <intent-filter> 
    <action android:name="android.intent.action.MAIN" /> 
 
    <category android:name="android.intent.category.LAUNCHER" /> 
   </intent-filter> 
  </activity> 
  <service android:name="com.test.update.UpdateService" > 
  </service> 
 </application> 
 
 <uses-permission android:name="android.permission.INTERNET" /> 
 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> 
 <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" /> 
 
</manifest> 

到此编码结束。

源码下载：Android实现APP自动更新功能

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