Android 软件自动更新功能的实现.docx

一个好的应用软件都是需要好的维护，从初出版本到最后精品，这个过程需要版本不停的更新，那么如何让用户第一时间获取最新的应用安装包呢？那么就要求我们从第一个版本就要实现升级模块这一功能。自 动更新功能的实现原理，就是我们事先和后台协商好一个接口，我们在应用的主Activity里，去访问这个接口，如果需要更新，后台会返回一些数据(比 如，提示语；最新版本的url等)。然后我们给出提示框，用户点击开始下载，下载完成开始覆盖安装程序，这样用户的应用就保持最新的拉。为了让大家容易理解，我像往常一样准备一个小例子，这里为了方便我就省去了和后台交互部分了。步骤分别如下：第一步：新建一个Android工程命名为:UpdateDemo.代码结构如下图所示：第二步：新建一个UpdateManager.java类，负责软件更新功能模块，代码如下：?123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198package com.tutor.update;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import .HttpURLConnection;import .MalformedURLException;import .URL;import android.app.AlertDialog;import android.app.Dialog;import android.app.AlertDialog.Builder;import android.content.Context;import android.content.DialogInterface;import android.content.Intent;import android.content.DialogInterface.OnClickListener;import .Uri;import android.os.Handler;import android.os.Message;import android.view.LayoutInflater;import android.view.View;import android.widget.ProgressBar;public class UpdateManager private Context mContext;/提示语private String updateMsg =有最新的软件包哦，亲快下载吧;/返回的安装包urlprivate String apkUrl =:8080/msoft/179/24659/43549/qq_hd_mini_1.4.apk;private Dialog noticeDialog;private Dialog downloadDialog;/* 下载包安装路径 */private static final String savePath = /sdcard/updatedemo/;private static final String saveFileName = savePath + UpdateDemoRelease.apk;/* 进度条与通知ui刷新的handler和msg常量 */private ProgressBar mProgress;private static final int DOWN_UPDATE = 1;private static final int DOWN_OVER = 2;private int progress;private Thread downLoadThread;private boolean interceptFlag = false;private Handler mHandler = new Handler()public void handleMessage(Message msg) switch (msg.what) case DOWN_UPDATE:mProgress.setProgress(progress);break;case DOWN_OVER:installApk();break;default:break;public UpdateManager(Context context) this.mContext = context;/外部接口让主Activity调用public void checkUpdateInfo()showNoticeDialog();private void showNoticeDialog()AlertDialog.Builder builder = new Builder(mContext);builder.setTitle(软件版本更新);builder.setMessage(updateMsg);builder.setPositiveButton(下载, new OnClickListener() Overridepublic void onClick(DialogInterface dialog, int which) dialog.dismiss();showDownloadDialog(););builder.setNegativeButton(以后再说, new OnClickListener() Overridepublic void onClick(DialogInterface dialog, int which) dialog.dismiss(););noticeDialog = builder.create();noticeDialog.show();private void showDownloadDialog()AlertDialog.Builder builder = new Builder(mContext);builder.setTitle(软件版本更新);final LayoutInflater inflater = LayoutInflater.from(mContext);View v = inflater.inflate(R.gress, null);mProgress = (ProgressBar)v.findViewById(R.gress);builder.setView(v);builder.setNegativeButton(取消, new OnClickListener() Overridepublic void onClick(DialogInterface dialog, int which) dialog.dismiss();interceptFlag = true;);downloadDialog = builder.create();downloadDialog.show();downloadApk();private Runnable mdownApkRunnable = new Runnable() Overridepublic void run() try URL url = new URL(apkUrl);HttpURLConnection conn = (HttpURLConnection)url.openConnection();conn.connect();int length = conn.getContentLength();InputStream is = conn.getInputStream();File file = new File(savePath);if(!file.exists()file.mkdir();String apkFile = saveFileName;File ApkFile = new File(apkFile);FileOutputStream fos = new FileOutputStream(ApkFile);int count = 0;byte buf = new byte1024;doint numread = is.read(buf);count += numread;progress =(int)(float)count / length) * 100);/更新进度mHandler.sendEmptyMessage(DOWN_UPDATE);if(numread = 0)/下载完成通知安装mHandler.sendEmptyMessage(DOWN_OVER);break;fos.write(buf,0,numread);while(!interceptFlag);/点击取消就停止下载.fos.close();is.close(); catch (MalformedURLException e) e.printStackTrace(); catch(IOException e)e.printStackTrace();/* 下载apk* param url*/private void downloadApk()downLoadThread = new Thread(mdownApkRunnable);downLoadThread.start();/* 安装apk* param url*/private void installApk()File apkfile =new File(saveFileName);if (!apkfile.exists() return;Intent i =new Intent(Intent.ACTION_VIEW);i.setDataAndType(Uri.parse(file:/ + apkfile.toString(),application/vnd.android.package-archive);mContext.startActivity(i);第三步：在MainActivity.java也就是主Activity调用,代码如下:?12345678910111213141516171819package com.tutor.update;import android.app.Activity;import android.os.Bundle;public class MainAcitivityextends Activity private UpdateManager mUpdateManager;Overridepublic void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState);setContentView(R.layout.main);/这里来检测版本是否需要更新mUpdateManager =new Upda