Android 软件自动更新功能实现的方法

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();    }   }  }; }

<?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>