如何在切换条件下随机化案例而不重复

Question

您好我正在尝试在此模型中制作Android应用程序。主要目的是随机化切换条件中的案例如下面的代码所示。因为我再次在每种情况下调用该方法，出现相同图像的机会很高。所以，我想知道如何使这个逻辑按顺序显示图像（即，我想随机化，但图像曾经出现过在所有图像周期完成之前不应出现）

public class MainActivity extends Activity{

//int blue,green,yellow,red,brown,white,pink,black;
//Boolean BLUE,GREEN,YELLOW,RED,BROWN,WHITE,PINK,BLACK;
ImageView iv1,iv2,iv3,fs;
private Handler handler = new Handler();
MediaPlayer mp;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    iv1 = (ImageView)findViewById(R.id.image1);
    iv2 = (ImageView)findViewById(R.id.image2);
    iv3 = (ImageView)findViewById(R.id.image3);
    fs = (ImageView)findViewById(R.id.img_fs);
    fs.setVisibility(View.GONE);
    switchingLogic();

}

public void switchingLogic() {      
    Random random = new Random();
    int x = random.nextInt(4)+1;

    switch (x) {
    case 1:
        mp = MediaPlayer.create(getApplicationContext(), R.raw.touch_blue);
        mp.start();
        iv1.setVisibility(View.VISIBLE);
        iv2.setVisibility(View.VISIBLE);
        iv3.setVisibility(View.VISIBLE);
        iv1.setImageResource(R.drawable.play_blue_1);
        iv2.setImageResource(R.drawable.play_blue_2);
        iv3.setImageResource(R.drawable.play_blue_3);
        iv1.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                switchCases();

                iv_gone();
                mp = MediaPlayer.create(getApplicationContext(), R.raw.correct_cheers);
                mp.start();

                fs.setVisibility(View.VISIBLE);
                fs.setImageResource(R.drawable.big_play_blue);

            }
        });
        iv2.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                iv2.setVisibility(View.GONE);

            }
        });
        iv3.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                iv3.setVisibility(View.GONE);

            }
        });

        break;

    case 2:
        iv1.setVisibility(View.VISIBLE);
        iv2.setVisibility(View.VISIBLE);
        iv3.setVisibility(View.VISIBLE);
        iv1.setImageResource(R.drawable.play_green_1);
        iv2.setImageResource(R.drawable.play_green_2);
        iv3.setImageResource(R.drawable.play_green_3);

        iv2.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                switchCases();
                iv_gone();
                mp = MediaPlayer.create(getApplicationContext(), R.raw.correct_cheers);
                mp.start();
                fs.setVisibility(View.VISIBLE);
                fs.setImageResource(R.drawable.big_play_green);
            }
        });
        iv1.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                iv1.setVisibility(View.GONE);

            }
        });
        iv3.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                iv3.setVisibility(View.GONE);

            }
        });
        break;
    case 3:
        iv1.setVisibility(View.VISIBLE);
        iv2.setVisibility(View.VISIBLE);
        iv3.setVisibility(View.VISIBLE);
        iv1.setImageResource(R.drawable.play_yellow_1);
        iv2.setImageResource(R.drawable.play_yellow_2);
        iv3.setImageResource(R.drawable.play_yellow_3);

        iv3.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                switchCases();
                iv_gone();
                mp = MediaPlayer.create(getApplicationContext(), R.raw.correct_cheers);
                mp.start();
                fs.setVisibility(View.VISIBLE);
                fs.setImageResource(R.drawable.big_play_yellow);
            }
        });
        iv1.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                iv1.setVisibility(View.GONE);

            }
        });
        iv2.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                iv2.setVisibility(View.GONE);

            }
        });

        break;
    case 4:
        iv1.setVisibility(View.VISIBLE);
        iv2.setVisibility(View.VISIBLE);
        iv3.setVisibility(View.VISIBLE);
        iv1.setImageResource(R.drawable.play_red_1);
        iv2.setImageResource(R.drawable.play_red_2);
        iv3.setImageResource(R.drawable.play_red_3);

        iv1.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                switchCases();
                iv_gone();
                mp = MediaPlayer.create(getApplicationContext(), R.raw.correct_cheers);
                mp.start();
                fs.setVisibility(View.VISIBLE);
                fs.setImageResource(R.drawable.big_play_red);
            }
        });
        iv2.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                iv2.setVisibility(View.GONE);

            }
        });
        iv3.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                iv3.setVisibility(View.GONE);

            }
        });
        break;
    default:
        break;
    }
      }
    protected void switchCases() {
        handler.postDelayed(new Runnable() {

            @Override
            public void run() {
                // TODO Auto-generated method stub
                fs.setVisibility(View.GONE);
                switchingLogic();
            }
        }, 1500);
    }
    public void iv_gone() {
        iv1.setVisibility(View.GONE);
        iv2.setVisibility(View.GONE);
        iv3.setVisibility(View.GONE);
    }

是否有任何解决方案或任何替代方案可用。谢谢。

Answer 1

以下是我评论的一个简单示例，请尝试以下方法：

public class MainActivity extends Activity{

    //int blue,green,yellow,red,brown,white,pink,black;
    //Boolean BLUE,GREEN,YELLOW,RED,BROWN,WHITE,PINK,BLACK;
    ImageView iv1,iv2,iv3,fs;
    private Handler handler = new Handler();
    MediaPlayer mp;
    Random random = new Random(); // Use only one random object, do not redeclare it
    List<Integer> recentResults; // A list saving your results

    public void switchingLogic() {      
        if(recentResults == null) recentResults = new ArrayList<Integer>();
        if(recentResults.size() == 4) recentResults.clear();

        int x = random.nextInt(4)+1;

        while(recentResults.contains(x)){
            x = random.nextInt(4)+1;
        }

        recentResults.add(x);

        switch (x) { 
            case 1: {
                // Other codes
                setSpecialOnClickListenerWithDrawable(iv1, R.drawable.big_play_blue);
                setGeneralOnClickListener(iv2);
                setGeneralOnClickListener(iv3);

                break;
            }
            // Other cases here
        }
    }

    public void setGeneralOnClickListener(ImageView iv) {      
        iv.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // v here will refers back to iv itself
                v.setVisibility(View.GONE);
            }
        });
    }

    public void setSpecialOnClickListenerWithDrawable(ImageView iv, final int drawable) {      
        iv.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                switchCases();

                iv_gone();
                mp = MediaPlayer.create(getApplicationContext(), R.raw.correct_cheers);
                mp.start();

                fs.setVisibility(View.VISIBLE);
                fs.setImageResource(drawable);
            }
        });
    }

    // Your other codes here
}

我做了一个简单的应用程序在上面执行，我得到x结果：4 3 2 1 2 4 1 3 3 1 4 2 1 3 4 2 3 4 2 1.这是你想要的吗？