How to set auto inverting color of text in TextView?

Question

For example, if the background was white, the text color would be black. If the BG was black, the text would be white. Blue BG, yellow text, etc. Update:

// method in MyActivity class
void changeBackgroundColor(int newColor) {
    activityLayout.setBackgroundColor(newColor);
    int invertingColor = ColorInvertor.invert(newColor);
    someTextView.setTextColor(invertingColor);
}

If I call activity.changeBackgroundColor(Color.WHITE), then someTextView has to change the text color to black, i.e. ColorInvertor.invert(Color.WHITE) == Color.BLACK, and ColorInvertor.invert(Color.BLACK) == Color.WHITE etc.

Sorry, but this is a programer forum, so you are not likely to get answers on application use here. Please try [Superuser forum](http://superuser.com/) where help on application and OS use is provided. — Tomáš Zato, Feb 04 '13 at 12:32
I'm programmer and I wanted to know whether there is a method that allows you to invert the text color to the background color. Thank you for your help! — Semenov Leonid, Feb 04 '13 at 12:44
http://stackoverflow.com/questions/4602902/how-to-set-text-color-of-textview-in-code check this. its not for inverting u have to write code for your need. — Parvathy, Feb 04 '13 at 12:49

score 6 · Accepted Answer · edited May 23 '17 at 12:15

6

Get the rgb values of your color and substract them from 255 :

yourColor = Color.rgb(0,130,20);

invertedRed = 255 - 0;
invertedGreen = 255 - 130;
invertedBlue = 255 - 20;

text.setTextColor(Color.rgb(invertedRed,invertedGreen,invertedBlue));

If you want to use hex values see How to get RGB value from hexadecimal color code in java

edited May 23 '17 at 12:15

Community

1
1

answered Feb 04 '13 at 14:56

mirenibg

96
1
2

score 0 · Answer 2 · edited May 12 '19 at 04:16

0

It is possible just by using simple conditions:

1.Get the color

2.Check the condition

3.Set the color

To get the color:

TextView tv1;
tv1=(TextView)findViewById(R.id.tv1);
ColorDrawable tv1color = (ColorDrawable) tv1.getBackground();

If you're on Android 3.0+, you can get out the resource ID of the color:

int tv1colorId = tv1color.getColor();

To set the Color:

TextView tv2;
tv2=(TextView)findViewById(R.id.tv2);
tv2.setBackgroundColor(0xFF00FF00);

Then put a condition as you want:

if (tv1colorID == R.color.green) {
   tv2.setBackgroundColor(color.WHITE); // As your choice color
}

edited May 12 '19 at 04:16

Cody Gray - on strike

239,200
50
490
574

answered Feb 04 '13 at 13:01

Gurucharan Vijayakumar

63
11

2

Impossible to test all possible colors. – Semenov Leonid Feb 04 '13 at 13:05
How, All the colors has its Hexcode, you can use the hexcode in conditions – Gurucharan Vijayakumar Feb 04 '13 at 13:07

score 0 · Answer 3 · answered Mar 06 '20 at 18:35

You can inverse a color by using those function...

//color
public static String getHex(int intColor) {
    String hexColor = String.format("#%06X", (0xFFFFFF & intColor));
    return hexColor;
}

public static String getRGBStringfromHex(String hexColor) {
    int color = Color.parseColor(hexColor);
    int red = Color.red(color);
    int green = Color.green(color);
    int blue = Color.blue(color);
    return red + "," + green + "," + blue;
}

public static int[] getRGBStringtoRGBInt(String splits[]) {
    int list[] = new int[3];
    list[0]=Integer.parseInt(splits[0]);
    list[1]=Integer.parseInt(splits[1]);
    list[2]=Integer.parseInt(splits[2]);
    return list;
}

public static int getRGBColor(int rgb[]) {
    int color = Color.rgb(rgb[0],rgb[1],rgb[2]);
    return color;
}

public static String invertedRGBfromRGB(int rgb[]) {
    int invertedRed = 255 - rgb[0];
    int invertedGreen = 255 - rgb[1];
    int invertedBlue = 255 - rgb[2];
    return invertedRed + "," + invertedGreen + "," + invertedBlue;
}

public static int getColorFromRGBString(String color) {
    ArrayList<Integer> list = new ArrayList<>();
    String splits[] = color.split(Pattern.quote(","));
    list.add(Integer.parseInt(splits[0]));
    list.add(Integer.parseInt(splits[1]));
    list.add(Integer.parseInt(splits[2]));
    return Color.rgb(list.get(0), list.get(1), list.get(2));
}

Ok now if you convert a int color...

String rgb[]=getRGBStringfromHex(getHex(colorThatWanttoInvert)).split(",");
int desireinvertedcolor=getColorFromRGBString(invertedRGBfromRGB(getRGBStringtoRGBInt(rgb)));

Hope this will help.

How to set auto inverting color of text in TextView?

3 Answers3