我想在随机时间创建按钮-Android

我想做一个简单的泡泡游戏,我想让10个泡泡在屏幕上随机出现,每次3秒。每当用户触摸一个泡泡时,他都会使其消失并获得一分。 Thred.sleep() 在for循环中,但它使所有应用程序等待循环结束,然后显示所有10个气泡。 以下是java代码:
methode方法

package com.adil.bullegame;


import android.app.ActivityManager;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.CountDownTimer;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.DisplayMetrics;

import android.view.View;
import android.widget.Button;

import android.widget.RelativeLayout;
import android.widget.TextView;
import java.io.IOException;
import java.io.InputStream;
import java.util.Random;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import static java.lang.Integer.parseInt;
import static java.lang.Thread.sleep;
import java.util.*;
import java.util.logging.Handler;
import java.util.logging.LogRecord;

public class MainActivity extends AppCompatActivity {

    private int bubblesNumber ;
    static int clickedBubbles=0;
    TextView text1;
    private static String in;
    private static final String FORMAT = "%02d:%02d:%02d";

    int seconds , minutes;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        text1=(TextView)findViewById(R.id.textView3);

        CountDownTimer start = new CountDownTimer(10000, 1000) { // adjust the milli seconds here

            public void onTick(long millisUntilFinished) {

                text1.setText("" + String.format(FORMAT,
                        TimeUnit.MILLISECONDS.toHours(millisUntilFinished),
                        TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished) - TimeUnit.HOURS.toMinutes(
                                TimeUnit.MILLISECONDS.toHours(millisUntilFinished)),
                        TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished) - TimeUnit.MINUTES.toSeconds(
                                TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished))));
            }

            public void onFinish() {
                showSimplePopUp();
                clickedBubbles=0;
            }
        }.start();


        // dynamic number of bubbles
        in =null;
        try{
            InputStream is = getAssets().open("file.txt");
            int size = is.available();
            byte[] buffer = new byte[size];
            is.read(buffer);
            is.close();
            in = new String(buffer);
        } catch (IOException e) {
            e.printStackTrace();
        }

        // bubblesNumber = parseInt(in);

        generateButtons(10);
    }

    private void generateButtons(int nbr)
    {
        for(int i = 0; i< nbr ; i++)
        {
            createButton();
            try {
                Thread.sleep(2000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }





            private void createButton() {

        RelativeLayout layout = (RelativeLayout)findViewById(R.id.activity_main);

            final Button myButton = new Button(this);
            layout.addView(myButton); ;

        RelativeLayout.LayoutParams absParams =
                (RelativeLayout.LayoutParams)myButton.getLayoutParams();

        DisplayMetrics displaymetrics = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
        int width = displaymetrics.widthPixels;
        int height = displaymetrics.heightPixels;


        Random r = new Random();


        absParams.leftMargin =  r.nextInt(width-150) ;
        absParams.topMargin =  r.nextInt(height-150);
        myButton.setLayoutParams(absParams);


        myButton.postDelayed(new Runnable()
                                { public void run()
                                    { myButton.setVisibility(View.GONE); } }, 3000);

        //new Timer().schedule(new TimerTask() {
         //  @Override
       //     public void run() {
           //       ((LinearLayout)myButton.getParent()).removeView(myButton);
         //      myButton.setVisibility(View.GONE);
       //     }
     //   }, 3000);

        myButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {

                clickedBubbles++;
                v.setVisibility(View.GONE);

            }
        });



    }

    private void showSimplePopUp() {

        AlertDialog.Builder gameOver = new AlertDialog.Builder(this);
        gameOver.setTitle("GameOver");
        gameOver.setMessage("You clicked "+ clickedBubbles + " bubbles");
        gameOver.setPositiveButton("restart",
                new DialogInterface.OnClickListener() {

                    public void onClick(DialogInterface dialog, int which) {
                        Intent intent = new Intent(MainActivity.this,  MainActivity.class);
                        startActivity(intent);

                    }

                });


        AlertDialog dialog = gameOver.create();
        dialog.show();
    }

}

注意:请检查 '生成按钮' methode方法