如何制作进度对话框以进行数据库复制？

Question

I have a game with a sqlite database, 10MB large. So, after installing the game, and upon first game start the database is being copied to internal memory and that takes a while, maybe 30 seconds, with black screen. This is pretty bad cause a user can think that the game froze. I was thinking, is there a way to show something like on the image below, saying "Copying DB in progress" or something, once the main menu opens? And how can I do that?

I'm copying my db from Assets folder using this code:

TestAdapter mDbHelper = new TestAdapter(this);
        DataBaseHelper myDbHelper = new DataBaseHelper(this);

        if(!myDbHelper.checkDataBase()){
        mDbHelper.createDatabase();
        }

Answer 1

Progress bar can be used with asyncTask. As you know the UI thread should be spared from heavy operation that can affect the responsiveness of the UI. Now this is when you use worker threads.

It can be very easy to use progressBar with async task... But since u didnt want asyncTask here is one example.

  btnStartProgress = (Button) findViewById(R.id.btnStartProgress);//the button that starts your function
    btnStartProgress.setOnClickListener(
             new OnClickListener() {

       @Override
       public void onClick(View v) {

        // prepare for a progress bar dialog
        progressBar = new ProgressDialog(v.getContext());
        progressBar.setCancelable(true);
        progressBar.setMessage("File downloading ...");
        progressBar.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
        progressBar.setProgress(0);
        progressBar.setMax(100);
        progressBar.show();

        //reset progress bar status
        progressBarStatus = 0;

        //reset filesize
        fileSize = 0;

        new Thread(new Runnable() {
          public void run() {
            while (progressBarStatus < 100) {

              // process some tasks
              progressBarStatus = doSomeTasks();

              // your computer is too fast, sleep 1 second
              try {
                Thread.sleep(1000);
              } catch (InterruptedException e) {
                e.printStackTrace();
              }

              // Update the progress bar
              progressBarHandler.post(new Runnable() {
                public void run() {
                  progressBar.setProgress(progressBarStatus);
                }
              });
            }

            // ok, file is downloaded,
            if (progressBarStatus >= 100) {

                // sleep 2 seconds, so that you can see the 100%
                try {
                    Thread.sleep(2000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }

                // close the progress bar dialog
                progressBar.dismiss();
            }
          }
           }).start();

           }

            });

    }

// file download simulator... a really simple
public int doSomeTasks() {

    while (fileSize <= 1000000) {

        fileSize++;

        if (fileSize == 100000) {
            return 10;
        } else if (fileSize == 200000) {
            return 20;
        } else if (fileSize == 300000) {
            return 30;
        }
        // ...add your own

    }

    return 100;

}

Click here for the sourcecode.

EDIT:

Check this tutorial . Click here.