Fill ArrayList with colors for Android

Question

I want to create 2 ArrayList. One holding 16 colors, the other one holding 139.

I have the list with colors (both RGB as 255,126,32 and Hex as 0xFFFF2552). I want to use the ArrayList to later pick random colors from.

I've tried int[], that doesn't work. I've tried ArrayList<Integer> and ArrayList<Color>. My problem is; I don't understand how to add the colors to the ArrayLists.

Thanks!!

For now, I'm exploring this:

Color cBlue = new Color(0,0,255);
Color cRed = new Color(255,0,0);

ArrayList colors = new ArrayList();
colors.add(cBlue);
colors.add(cRed);

and so on...

I really like int[] colors = = new int[] {4,5}; because it's only one line of code... but how do I get colors in, to later on, pick from?

or.. would it be better to store the colors in a strings.xml file and then fill the ArrayList from there? If so, how should I do that?

Thanks!!

Answer 1

You could try:

int[] colors = new int[] {Color.rgb(1,1,1), Color.rgb(...)};

For example, but I don't think it's a good idea to decide only using "one line" argument.

List<Integer> coloras = Arrays.asList(new Integer[]{Color.rgb(1, 1, 1), Color.rgb(...)});

Will also work.

You can create an arraylist in arrays.xml file:

<resources>
    <string-array name="colors">        
        <item>#ff0000</item>
        <item>#00ff00</item>  
        <item>#0000ff</item>
    </string-array>
</resources>

Then use the loop to read them:

String[] colorsTxt = getApplicationContext().getResources().getStringArray(R.array.colors);
List<Integer> colors = new ArrayList<Integer>();
for (int i = 0; i < colorsTxt.length; i++) {
    int newColor = Color.parseColor(colorsTxt[i]);
    colors.add(newColor);
}

In my opinion keeping colors in the list is the most convinient solution.

To take a color from the list randomly, you do:

int rand = new Random().nextInt(colors.size());
Integer color = colors.get(rand);