半小时学会Android软件版本更新

各种平台软件更新做法差不多，大体做法如下：

1.服务器存放一个最新版本的xml文件，或者存在数据库，各种做法都可以。

1.1xml文件存储verCode verName updateUrl等信息

1.2用户安装的软件的verCode和服务器上取得的做比较，检测到版本低就更新

2.下面是Android手机软件版本更新的教程

2.1项目目录

2.2编写UpdateManager类

package com.doublejun.update;import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.DialogInterface.OnClickListener;
import android.content.IntentFilter;
import android.net.Uri;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ProgressBar;public class UpdateManager {private Context mContext;private final String updateMsg = "亲，有新版本，快下载吧！";			//下载消息提示private Dialog noticeDialog;										//下载提示对话框private Dialog downloadDialog;										//下载进度对话框private ProgressBar mProgressBar;									//进度条private Boolean interceptFlag = false;								//标记用户是否在下载过程中取消下载private Thread downloadApkThread = null;							//下载线程private final String apkUrl = "http://www.ypdm.com/hyjj.apk";		//apk的URL地址private final String savePath = "/sdcard/UpdateDemo/";				//下载的apk存放的路径private final String saveFileName = savePath + "hyjjrelease.apk";	//下载的apk文件private int progress = 0;											//下载进度private final int DOWNLOAD_ING = 1;									//标记正在下载private final int DOWNLOAD_OVER = 2;								//标记下载完成private final String TAG="版本更新";									//日志打印标签private Handler mhandler = new Handler() {							//更新UI的handler@Overridepublic void handleMessage(Message msg) {super.handleMessage(msg);switch (msg.what) {case DOWNLOAD_ING:// 更新进度条mProgressBar.setProgress(progress);break;case DOWNLOAD_OVER:downloadDialog.dismiss();installApk();//安装break;default:break;}}};/** 构造方法*/public UpdateManager(Context context) {this.mContext = context;}/** 检查是否有需要更新，具体比较版本xml*/public void checkUpdate() {// 到服务器检查软件是否有新版本//如果有则showNoticeDialog();}/** 显示版本更新对话框*/private void showNoticeDialog() {AlertDialog.Builder builder = new Builder(mContext);builder.setTitle("版本更新");builder.setMessage(updateMsg);builder.setPositiveButton("更新", new OnClickListener() {public void onClick(DialogInterface dialog, int which) {noticeDialog.dismiss();showDownloadDialog();}});builder.setNegativeButton("以后再说", new OnClickListener() {public void onClick(DialogInterface dialog, int which) {noticeDialog.dismiss();}});noticeDialog = builder.create();noticeDialog.show();}/** 弹出下载进度对话框*/private void showDownloadDialog() {AlertDialog.Builder builder = new Builder(mContext);builder.setTitle("软件更新");final LayoutInflater inflater = LayoutInflater.from(mContext);View v = inflater.inflate(R.layout.progress, null);mProgressBar = (ProgressBar) v.findViewById(R.id.updateProgress);builder.setView(v);builder.setNegativeButton("取消", new OnClickListener() {public void onClick(DialogInterface dialog, int which) {downloadDialog.dismiss();interceptFlag = true;}});downloadDialog = builder.create();downloadDialog.show();downloadLatestVersionApk();}/** 下载最新的apk文件*/private void downloadLatestVersionApk() {downloadApkThread = new Thread(downloadApkRunnable);downloadApkThread.start();}//匿名内部类，apk文件下载线程private Runnable downloadApkRunnable = new Runnable() {public void run() {try {URL url = new URL(apkUrl);HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.connect();int length = conn.getContentLength();Log.e(TAG, "总字节数:"+length);InputStream is = conn.getInputStream();File file = new File(savePath);if (!file.exists()) {file.mkdir();}File apkFile = new File(saveFileName);FileOutputStream out = new FileOutputStream(apkFile);int count = 0;int readnum = 0;byte[] buffer = new byte[1024];do {readnum = is.read(buffer);count += readnum;progress = (int) (((float) count / length) * 100);Log.e(TAG, "下载进度"+progress);mhandler.sendEmptyMessage(DOWNLOAD_ING);if (readnum <= 0) {// 下载结束mhandler.sendEmptyMessage(DOWNLOAD_OVER);break;}out.write(buffer,0,readnum);} while (!interceptFlag);is.close();out.close();} catch (MalformedURLException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}};/** 安装下载的apk文件*/private void installApk() {File file= new File(saveFileName);if(!file.exists()){return;}Intent intent= new Intent(Intent.ACTION_VIEW);intent.setDataAndType(Uri.parse("file://"+file.toString()), "application/vnd.android.package-archive");mContext.startActivity(intent);}
}

以上代码注释足够详细。不解释了。。

2.3在Main中调用试试吧。

package com.doublejun.update;import android.app.Activity;
import android.os.Bundle;public class Main extends Activity {/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);UpdateManager update = new UpdateManager(this);update.checkUpdate();}
}

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