Android: Generate random color on click?
AndroidColorsImageviewAndroid Problem Overview
I have an ImageView, in which I am programmaticly creating drawables and presenting them to the user. My goal is to click on said ImageView and change the drawable's color.
How would I go about the random color changing bit? I am currently tinkering with Random(), Color.argb() and a few other things, but I can't seem to get it to work!
Android Solutions
Solution 1 - Android
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...
Solution 2 - Android
to get random color values you can use this method:
public int getRandomColor(){
Random rnd = new Random();
return Color.argb(255, rnd.nextInt(256), rnd.nextInt(256), rnd.nextInt(256));
}
then apply to your views:
myView.setBackgroundColor(getRandomColor());
Solution 3 - Android
So if you’re looking for a beautiful color palette, Maybe It's Not Such A Great Idea To use totally random values.
This approach might not yield the best results, It always ends up with a selection of similar colors that way too dark or way too bright.
Semi-random approach :
If you need some fresh and shiny colors then use the following simple class, that I wrote previously when I had the same issues. It's semi-random and uses a predefined color palette:
class RandomColors {
private Stack<Integer> recycle, colors;
public RandomColors() {
colors = new Stack<>();
recycle =new Stack<>();
recycle.addAll(Arrays.asList(
0xfff44336,0xffe91e63,0xff9c27b0,0xff673ab7,
0xff3f51b5,0xff2196f3,0xff03a9f4,0xff00bcd4,
0xff009688,0xff4caf50,0xff8bc34a,0xffcddc39,
0xffffeb3b,0xffffc107,0xffff9800,0xffff5722,
0xff795548,0xff9e9e9e,0xff607d8b,0xff333333
)
);
}
public int getColor() {
if (colors.size()==0) {
while(!recycle.isEmpty())
colors.push(recycle.pop());
Collections.shuffle(colors);
}
Integer c= colors.pop();
recycle.push(c);
return c;
}
}
Random approach :
But if you're still considering use random approach you may want use this single line instead of multiple lines of code :
int color= ((int)(Math.random()*16777215)) | (0xFF << 24);
The purpose of using this (0xFF << 24) is to set the alpha value to the maximum that means zero transparency.
Solution 4 - Android
In Kotlin:
val rnd = Random()
val color = Color.argb(255, rnd.nextInt(256), rnd.nextInt(256), rnd.nextInt(256))
myView.setBackgroundColor(color)
Solution 5 - Android
I met this and this is my code,May some help
/**
* view-source:http://www.kareno.org/js/colors/ 参考
*Get Random background color and the text color for the background
* @return 0--》background
* 1--》text color
*/
public static int[] getRandomColor() {
Random random = new Random();
int RGB = 0xff + 1;
int[] colors = new int[2];
int a = 256;
int r1 = (int) Math.floor(Math.random() * RGB);
int r2 = (int) Math.floor(Math.random() * RGB);
int r3 = (int) Math.floor(Math.random() * RGB);
colors[0] = Color.rgb(r1, r2, r3);
if((r1 + r2 + r3) > 450) {
colors[1] = Color.parseColor("#222222");
}else{
colors[1] = Color.parseColor("#ffffff");
}
return colors;
}
Solution 6 - Android
thing.setBackgroundColor(new Random().nextInt());
Solution 7 - Android
You can use ColorGenerator for picking the random color
ColorGenerator generator = ColorGenerator.MATERIAL; // or use DEFAULT
int color1 = generator.getRandomColor(); // generate random color
If you want to have the same specific color code for repeated same usernames. you can use like below
public int getColorCode(String userName)
{
ColorGenerator generator = ColorGenerator.MATERIAL; // or use DEFAULT
// generate color based on a key (same key returns the same color), useful for list/grid views
int colorCode = generator.getColor(userName);
return colorCode;
}
Solution 8 - Android
Simplest Sol... Change the range to avoid dark or light color.. like 30 to 200 to avoid black and white family..
val randomColor: Int
get() {
return Color.rgb((30..200).random(),(30..200).random(),(30..200).random())
}
Solution 9 - Android
Here is an extension to do the same:
fun Int.Companion.randomColor(): Int
{
return Color.argb(255,
Random.nextInt(256),
Random.nextInt(256),
Random.nextInt(256))
}
and this is the usage:
myTextView.setBackgroundColor(Int.randomColor());
Solution 10 - Android
This is my code I used in an application, it may help you.
It generates a random color on touch
public boolean onTouch(View v, MotionEvent event) {
int x = (int)event.getX();
int y = (int) event.getY();
float w = v.getWidth();
if(x < (w * (1.0/3) )){
layout.setBackgroundColor(Color.rgb(255,x,y));
}else if(x < (w * (2.0 / 3))){
layout.setBackgroundColor(Color.rgb(x,255,y));
}else{
layout.setBackgroundColor(Color.rgb(x,y,255));
}
return true;
}
Solution 11 - Android
public static int randomColor(){
float[] TEMP_HSL = new float[]{0, 0, 0};
float[] hsl = TEMP_HSL;
hsl[0] = (float) (Math.random() * 360);
hsl[1] = (float) (40 + (Math.random() * 60));
hsl[2] = (float) (40 + (Math.random() * 60));
return ColorUtils.HSLToColor(hsl);
}
Solution 12 - Android
I hope the following two solutions may help you.
There are two way to get random colors programmatically to set to view
1.First solution
public int randomColor()
{
Random random= new Random();
return Color.argb(255, random.nextInt(256), random.nextInt(256),
random.nextInt(256));
}
> If you are using in adapter on scroll you may get random colors for the same view this may not look good, to avoid this you can use the second solution.
2.Second Solution
> You can use ColorGenerator.DEFAULT instead of ColorGenerator.MATERIAL as per your choice. You can also use any number instead of position
ColorGenerator generator = ColorGenerator.MATERIAL;
int color = generator.getColor(position);
holder.mEvent_color_strip.setBackgroundColor(color);
Solution 13 - Android
bb.setBackgroundColor(Color.rgb(
getRandomInteger(0,255),
getRandomInteger(0, 255),
getRandomInteger(0, 255)
));
Solution 14 - Android
Most Accurate Solution of this problem:
-First, add this in the gradle (app),
compile 'com.github.lzyzsd.randomcolor:library:1.0.0'
then compile and rebuild the app.
-The second step just use it by this way,
RandomColor randomColor = new RandomColor();
Button l = findviewbyid(R.id.B1);
l.setBackgroundColor(randomColor.randomColor());
Reference Link:
Solution 15 - Android
In your case you should do like here, it's work to me
@Override
public void onBindViewHolder(@NonNull WeatherMainAdapter.ViewHolder holder, int position) {
Random rnd = new Random();
int color = Color.argb(255, rnd.nextInt(256), rnd.nextInt(256), rnd.nextInt(256));
holder.date.setText(items.get(position).getDt_txt());
holder.temp.setText(items.get(position).main.getTemp());
holder.press.setText(items.get(position).main.getPressure());
holder.cardView.setBackgroundColor(color);
}
Solution 16 - Android
public static String rndColor()
{
Random random = new Random();
int num = random.nextInt(16777215);
String hex = "";
while (num != 0)
{
if (num % 16 < 10)
hex = Integer.toString(num % 16) + hex;
else
hex = (char)((num % 16)+55) + hex;
num = num / 16;
}
return "#"+((hex.length()<6)?String.format("%0"+(6-hex.length())+"d", 0):"") + hex;
}
Solution 17 - Android
Random color in Jetpack Compose
val RandomColor
get() = Color(Random.nextInt(256), Random.nextInt(256), Random.nextInt(256))