Android: Generate Random Color on Click

Android: Generate random color on click?

Random rnd = new Random();
paint.setARGB(255, rnd.nextInt(256), rnd.nextInt(256), rnd.nextInt(256));

or

Random rnd = new Random(); 
int color = Color.argb(255, rnd.nextInt(256), rnd.nextInt(256), rnd.nextInt(256));   
view.setBackgroundColor(color);

Though in your case it seems that you want to create a new drawable and assign it to your view. What is actually the drawable in your case? Is it an image, shape, fill...

How to set random color

You can generate random colors like this:

Random rnd = new Random(); 
int color = Color.argb(255, rnd.nextInt(256), rnd.nextInt(256), rnd.nextInt(256));   

How to output a random color from a set of selected colors in Java? (Android)

First of all in color.xml define your colors and create array of it.

<?xml version="1.0" encoding="utf-8"?>
<resources>

<item name="blue" type="color">#FF33B5E5</item>
<item name="purple" type="color">#FFAA66CC</item>
<item name="green" type="color">#FF99CC00</item>
<item name="orange" type="color">#FFFFBB33</item>
<item name="red" type="color">#FFFF4444</item>
<item name="darkblue" type="color">#FF0099CC</item>
<item name="darkpurple" type="color">#FF9933CC</item>
<item name="darkgreen" type="color">#FF669900</item>
<item name="darkorange" type="color">#FFFF8800</item>
<item name="darkred" type="color">#FFCC0000</item>

<integer-array name="androidcolors">
    <item>@color/blue</item>
    <item>@color/purple</item>
    <item>@color/green</item>
    <item>@color/orange</item>
    <item>@color/red</item>
    <item>@color/darkblue</item>
    <item>@color/darkpurple</item>
    <item>@color/darkgreen</item>
    <item>@color/darkorange</item>
    <item>@color/darkred</item>
</integer-array>

</resources>

Now generate random color like below in onCreate method.

int[] androidColors = getResources().getIntArray(R.array.androidcolors);
int randomAndroidColor = androidColors[new Random().nextInt(androidColors.length)];

Lastly set this generated color.

view.setBackgroundColor(randomAndroidColor);  

Source taken from here.

How to set background to a random color at button press in Android?

I'm not sure if this will work (but it's worth a try):

Try initializing color = new Random() within the onClick() statement.

b.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View v) {
         color = new Random();
         p.setARGB(256,color.nextInt(256),color.nextInt(256),color.nextInt(256));                  
    a.setBackgroundColor((p.getColor()));

    }
});

Also, look at this question:

Android: Generate random color on click?

it seems like it's trying to accomplish a similar goal.

How can set my button a random color to the background. Android

in the MainActivity code this :

  public class MainActivity extends AppCompatActivity {
  private ConstraintLayout layout;
  private Button randombutton;

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

    layout = findViewById(R.id.layout);

    randombutton = findViewById(R.id.button);

    randombutton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            int randomColor = new Kleurenpalet().getRandomColor();
            layout.setBackgroundColor(randomColor);
        }
     });
    }
    }

Creating random colour in android with some key (for the same key it should generate same colour)

int getUserColourCode(String userId) {
StringBuilder input1 = new StringBuilder();

input1.append(userId);
input1=input1.reverse();
String pair[]={"0","0","0","0","0","0","0","0"};
char[] character = input1.toString().toCharArray();

for(int i=0;i<character.length;i++)
{
  pair[i]=String.valueOf(character[i]);
}
int color = Color.argb((Integer.parseInt(pair[0]+pair[1])*2)+50, (Integer.parseInt(pair[2]+pair[3])*2)+50, (Integer.parseInt(pair[4]+pair[5])*2)+50, (Integer.parseInt(pair[6]+pair[7])*2)+50);
return color;

}

Android: Set Random colour background on create

In colors.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <item name="blue" type="color">#FF33B5E5</item>
    <item name="purple" type="color">#FFAA66CC</item>
    <item name="green" type="color">#FF99CC00</item>
    <item name="orange" type="color">#FFFFBB33</item>
    <item name="red" type="color">#FFFF4444</item>
    <item name="darkblue" type="color">#FF0099CC</item>
    <item name="darkpurple" type="color">#FF9933CC</item>
    <item name="darkgreen" type="color">#FF669900</item>
    <item name="darkorange" type="color">#FFFF8800</item>
    <item name="darkred" type="color">#FFCC0000</item>

    <integer-array name="androidcolors">
        <item>@color/blue</item>
        <item>@color/purple</item>
        <item>@color/green</item>
        <item>@color/orange</item>
        <item>@color/red</item>
        <item>@color/darkblue</item>
        <item>@color/darkpurple</item>
        <item>@color/darkgreen</item>
        <item>@color/darkorange</item>
        <item>@color/darkred</item>
    </integer-array>

</resources> 

In onCreate()

int[] androidColors = getResources().getIntArray(R.array.androidcolors);
int randomAndroidColor = androidColors[new Random().nextInt(androidColors.length)];
view.setBackgroundColor(randomAndroidColor);

How to choose a random color from a list in Kotlin?

You can define a color array and use random() func to get random color from it

val colors = arrayOf(
     Color.parseColor("#FFFFFF"),
     Color.parseColor("#000000"),
     Color.parseColor("#FF8F00"),
     Color.parseColor("#EF6C00"),
     Color.parseColor("#D84315"),
     Color.parseColor("#37474F"),
     //...more
)
val randomColor = colors.random()

Or random generate a color

val rnd = Random.Default //kotlin.random
val color = Color.argb(255, rnd.nextInt(256), rnd.nextInt(256), rnd.nextInt(256))

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