progressBar对话框从0开始不向上计数，只显示一秒钟

Question

我有一个progressBar对话框，当我单击我的按钮时，对话框出现并显示一条消息，但进度保持在0％，然后进入下一个活动，而不是按预期从0％-100％开始。谁能看到我出错的地方？

package win.jay.todo.list;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.app.ProgressDialog;
import android.view.Menu;

public class Welcome extends Activity {

    private ProgressDialog progress;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_welcome);
        progress = new ProgressDialog(this);
    }

    //Onclick - go to Tasks
    public void doStuff(View view) {
        Intent intent = new Intent(Welcome.this, Tasks.class);
        startActivity(intent);

        progress.setMessage("Finding tasks...");
        progress.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
        progress.setIndeterminate(true);
        progress.show();

        final int totalProgressTime = 100;

        final Thread t = new Thread(){

           @Override
           public void run(){

              int jumpTime = 5;
              while(jumpTime < totalProgressTime){
                 try {
                    Thread.sleep(200);
                    jumpTime += 5;
                    progress.setProgress(jumpTime);
                 } catch (InterruptedException e) {
                   // TODO Auto-generated catch block
                   e.printStackTrace();
                 }
              }

           }

       };
       t.start();

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
    //Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu, menu);
        return true;
    }

}