How can I get the random images displaying to not repeat?

jahmed1472 :

I'm making a generic app using Android Studio; I want to display 4 random images from my array but don't know how prevent an image repeating.

public class answerScreen extends AppCompatActivity {
ImageView imageView, imageView2, imageView3, imageView4;
Random r;
Integer[] images = {
        R.drawable.img1,
        R.drawable.img2,
        R.drawable.img3,
        R.drawable.img4,
        R.drawable.img5,
        R.drawable.img6,
        R.drawable.img7
};


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_answer_screen);

    imageView = (ImageView) findViewById(R.id.imageView);
    imageView2 = (ImageView) findViewById(R.id.imageView2);
    imageView3 = (ImageView) findViewById(R.id.imageView3);
    imageView4 = (ImageView) findViewById(R.id.imageView4);

    r = new Random();

    //diplay random image
    imageView.setImageResource(images[r.nextInt(images.length)]);
    imageView2.setImageResource(images[r.nextInt(images.length)]);
    imageView3.setImageResource(images[r.nextInt(images.length)]);
    imageView4.setImageResource(images[r.nextInt(images.length)]);
}
}

Eritrean :

You could generate 4 random ints in range [0,images.length) and store them in an array like:

Random r = new Random();
int randInts [] = r.ints(0, images.length).distinct().limit(4).toArray();

and use that array to set image resources:

imageView.setImageResource(images[randInts[0]]);
imageView2.setImageResource(images[randInts[1]]);
imageView3.setImageResource(images[randInts[2]]);
imageView4.setImageResource(images[randInts[3]]);

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