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);

}