Android应用自动更新功能的实现！

Android应用自动更新功能的实现！
http://blog.csdn.net/android_tutor/article/details/7015986

private static final int DOWN_UPDATE = 1;
private static final int DOWN_OVER = 2;
private String apkUrl = "http://softfile.3g.qq.com:8080/msoft/179/24659/43549/qq_hd_mini_1.4.apk";  

private static String saveFileName = savePath + "";

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;        
        }
    }
};

LayoutInflater inflater = LayoutInflater.from(mContext);
View v = inflater.inflate(R.layout.progress, null);

private Runnable mdownApkRunnable = new Runnable() {
    public 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 byte[1024];

            do {
                int numRead = is.read(buf);
                count += numRead;
                progress = (int) ( ((float) count / length) * 100 );
                mHandler.sendEmptyMessage(DOWN_UPDATE);
                if (numRead <= 0) {
                    mHandler.sendEmptyMessage(DOWN_OVER);
                    break;
                }
                fos.write(buf, 0, numRead);
            } while (!interceptFlag);

            fos.close();
            is.close();

        } catch (MalformedURLException e) {
            e.printStackTrace(); 
        } catch (IOException  e) {
            e.printStackTrace(); 
        }
    }
}

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);
}