?

?

?private int progress;// 當前進度
?private Thread downLoadThread; // 下載線程
?private boolean interceptFlag = false;// 用戶取消下載
?// 通知處理刷新界面的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;
?}
?// 顯示更新程序對話框，供主程序調用
?public void checkUpdateInfo() {
??showNoticeDialog();
?}
?private void showNoticeDialog() {
??android.app.AlertDialog.Builder builder = new android.app.AlertDialog.Builder(
????mContext);// Builder，可以通過此builder設置改變AleartDialog的默認的主題樣式及屬性相關信息
??builder.setTitle("軟件版本更新");
??builder.setMessage(updateMsg);
??builder.setPositiveButton("下載", new OnClickListener() {
???@Override
???public void onClick(DialogInterface dialog, int which) {
????dialog.dismiss();// 當取消對話框后進行操作一定的代碼？取消對話框
????showDownloadDialog();
???}
??});
??builder.setNegativeButton("以后再說", 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("軟件版本更新");
??final LayoutInflater inflater = LayoutInflater.from(mContext);
??View v = inflater.inflate(R.layout.progress, null);

??mProgress = (ProgressBar) v.findViewById(R.id.progress);
??builder.setView(v);// 設置對話框的內容為一個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()會返回路徑信息
??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);
?????// 下載進度
?????mHandler.sendEmptyMessage(DOWN_UPDATE);
?????if (numread <= 0) {
??????// 下載完成通知安裝
??????mHandler.sendEmptyMessage(DOWN_OVER);
??????break;
?????}
?????outStream.write(buf, 0, numread);
????} while (!interceptFlag);// 點擊取消停止下載
????outStream.close();
????ins.close();
???} catch (Exception e) {
????e.printStackTrace();
???}
??}
?};
}

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

</LinearLayout>