Android实现APP自动更新功能

 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(); } } } 

 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"; } 

 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; if (!updateDir.exists()) { updateDir.mkdirs(); } if (!updateFile.exists()) { updateFile.createNewFile(); } // 下载函数，以QQ为例子 // 增加权限; 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); } } } } 

 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