版本更新 但是不能判断版本

转载： 

http://www.jb51.net/article/35813.htm  

首先看一下程序目录结构

  

步骤:

1、新建一个类UpdateManger，用于显示提示更新

复制代码 代码如下:

public class UpdateManger {
 // 应用程序Context
 private Context mContext;
 // 提示消息
 private String updateMsg = "有最新的软件包，请下载！";
 // 下载安装包的网络路径
 private String apkUrl = "http://softfile.3g.qq.com:8080/msoft/179/24659/43549/qq_hd_mini_1.4.apk";
 private Dialog noticeDialog;// 提示有软件更新的对话框
 private Dialog downloadDialog;// 下载对话框
 private static final String savePath = "/sdcard/updatedemo/";// 保存apk的文件夹
 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;// 当前进度 private Thread downLoadThread; // 下载线程 private boolean interceptFlag = false;// 用户取消下载 // 通知处理刷新界面的handler private Handler mHandler = new Handler() {  @SuppressLint("HandlerLeak")  @Override  public void handleMessage(Message msg) {   switch (msg.what) {   case DOWN_UPDATE:    mProgress.setProgress(progress);    break;   case DOWN_OVER:    installApk();    break;   }   super.handleMessage(msg);  } }; public UpdateManger(Context context) {  this.mContext = context; } // 显示更新程序对话框，供主程序调用 public void checkUpdateInfo() {  showNoticeDialog(); } private void showNoticeDialog() {  android.app.AlertDialog.Builder builder = new android.app.AlertDialog.Builder(    mContext);// Builder，可以通过此builder设置改变AleartDialog的默认的主题样式及属性相关信息  builder.setTitle("软件版本更新");  builder.setMessage(updateMsg);  builder.setPositiveButton("下载", new OnClickListener() {   @Override   public void onClick(DialogInterface dialog, int which) {    dialog.dismiss();// 当取消对话框后进行操作一定的代码？取消对话框    showDownloadDialog();   }  });  builder.setNegativeButton("以后再说", new OnClickListener() {   @Override   public void onClick(DialogInterface dialog, int which) {    dialog.dismiss();   }  });  noticeDialog = builder.create();  noticeDialog.show(); } protected void showDownloadDialog() {  android.app.AlertDialog.Builder builder = new android.app.AlertDialog.Builder(mContext);  builder.setTitle("软件版本更新");  final LayoutInflater inflater = LayoutInflater.from(mContext);  View v = inflater.inflate(R.layout.progress, null);
  mProgress = (ProgressBar) v.findViewById(R.id.progress);  builder.setView(v);// 设置对话框的内容为一个View  builder.setNegativeButton("取消", new OnClickListener() {   @Override   public void onClick(DialogInterface dialog, int which) {    dialog.dismiss();    interceptFlag = true;   }  });  downloadDialog = builder.create();  downloadDialog.show();  downloadApk(); } private void downloadApk() {  downLoadThread = new Thread(mdownApkRunnable);  downLoadThread.start(); } protected 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");// File.toString()会返回路径信息  mContext.startActivity(i); } private Runnable mdownApkRunnable = new Runnable() {  @Override  public void run() {   URL url;   try {    url = new URL(apkUrl);    HttpURLConnection conn = (HttpURLConnection) url.openConnection();    conn.connect();    int length = conn.getContentLength();    InputStream ins = conn.getInputStream();
    File file = new File(savePath);    if (!file.exists()) {     file.mkdir();    }    String apkFile = saveFileName;    File ApkFile = new File(apkFile);    FileOutputStream outStream = new FileOutputStream(ApkFile);    int count = 0;    byte buf[] = new byte[1024];    do {     int numread = ins.read(buf);     count += numread;     progress = (int) (((float) count / length) * 100);     // 下载进度     mHandler.sendEmptyMessage(DOWN_UPDATE);     if (numread <= 0) {      // 下载完成通知安装      mHandler.sendEmptyMessage(DOWN_OVER);      break;     }     outStream.write(buf, 0, numread);    } while (!interceptFlag);// 点击取消停止下载    outStream.close();    ins.close();   } catch (Exception e) {    e.printStackTrace();   }  } };}

2、新建一个xml文件，用于定义下载过程中的ProgressBar的进度显示，名为progress.xml

复制代码 代码如下:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >

<ProgressBar
android:id="@+id/progress"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />

</LinearLayout>

3、在MainActivity中onCreate()方法中，进行软件更新的检测

mUpdateManger = new UpdateManger(MainActivity.this);// 注意此处不能传入getApplicationContext();会报错，因为只有是一个Activity才可以添加窗体
mUpdateManger.checkUpdateInfo();

并且在配置清单文件中添加网络权限 <uses-permission android:name="android.permission.INTERNET" />

4、运行程序

--点击下载-->