How to get a value of color attribute programmatically

Question

When I use resolveAttribute() to find out a color value of ?attr/colorControlNormal, I got 236:

TypedValue typedValue = new TypedValue();
getTheme().resolveAttribute(R.attr.colorControlNormal, typedValue, true);
int color = typedValue.data;
// 236

But when I use an XML layout with the following TextView element:

<TextView
  android:id="@+id/textView"
  style="?android:attr/textAppearance"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:textColor="?attr/colorControlNormal"
  android:text="@null" />

...and the following Java code:

View textView = findViewById(R.id.textView);
int color = ((TextView) textView).getCurrentTextColor();
// -1979711488

I got a color value of -1979711488

Why those results vary? I expected to get same color values, but they are not.

The second approach (I believe) returns a correct color value. Why is my first approach wrong?

I would prefer to obtain the color value of ?attr/colorControlNormal without a need of using actual element. How can I do that?

what do you see on the `logcat` when you `Log.d` the value of `typedValue.coerceToString()`? — pskink, Mar 19 '18 at 11:24
@pskink `TypedValue{t=0x3/d=0xec "res/color/secondary_text_material_light.xml" a=1 r=0x10601e8}` — Ωmega, Mar 19 '18 at 11:56
see https://mbcdev.com/2017/01/16/resolving-android-theme-colours-programmatically/ — pskink, Mar 19 '18 at 12:07
@IgorGanapolsky - the idea is to get the color used in the theme — Ωmega, Mar 19 '20 at 23:43

azizbekian · Accepted Answer · 2018-03-19T11:31:44.430

54

I believe instead of this:


    TypedValue typedValue = new TypedValue();
    getTheme().resolveAttribute(R.attr.colorControlNormal, typedValue, true);
    int color = typedValue.data;

You should do this:


    TypedValue typedValue = new TypedValue();
    getTheme().resolveAttribute(R.attr.colorControlNormal, typedValue, true);
    int color = ContextCompat.getColor(this, typedValue.resourceId)

edited Mar 19 '18 at 11:31

answered Mar 19 '18 at 11:27

azizbekian

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Is there some similar way to get a font size for `?android:attr/textAppearance` style? or a font color for `?android:attr/buttonBarNeutralButtonStyle` style? Please advise. Thank you. – Ωmega Mar 19 '18 at 12:03
Use `obtainStyledAttributes` passing down `android.R.attr.textAppearance`. See an example [here](https://stackoverflow.com/a/48138524/1083957). – azizbekian Mar 19 '18 at 12:09
Styles contain many attributes, I assume. How can I use that with `ta.getResourceId`? What index should I use to get color and what index to get font-size? I am confused. Please clarify. Thanks – Ωmega Mar 19 '18 at 12:40
I assume this way: if you have specified, that you want to get resources (a, b, c), then for getting a's value, you have to refer to index 0, c-s value will be index 2. If you know, that c is a color, than you should perform `typedArray.getColor(2, 0)`. – azizbekian Mar 19 '18 at 13:06
Nope, `java.lang.UnsupportedOperationException: Can't convert value at index 0 to color: type=0x1` – Ωmega Mar 19 '18 at 13:18

score 1 · Answer 2 · edited Mar 19 '18 at 17:53

1

It's correct I think, check with it

HEX

Integer intColor = -1979711488138;
String hexColor = "#" + Integer.toHexString(intColor).substring(2);

or

int color = getCurrentTextColor();
int a = Color.alpha(color);
int r = Color.red(color);
int g = Color.green(color);
int b = Color.blue(color);

edited Mar 19 '18 at 17:53

AskNilesh

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answered Mar 19 '18 at 11:44

vihkat

895
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28

score 1 · Answer 3 · answered Sep 22 '22 at 21:32

1

Using Kotlin you can do the following to get the color:

val color = TypedValue().let {
    requireContext().theme.resolveAttribute(R.attr.colorControlNormal, it, true)
    requireContext().getColor(it.resourceId)
}

answered Sep 22 '22 at 21:32

James

4,573
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score 0 · Answer 4 · answered Aug 19 '23 at 08:22

In Kotlin, according to @azizbekian answer, to do it you could do something like this:

val typedValue = TypedValue()
theme.resolveAttribute(com.google.android.material.R.attr.colorControlNormal, typedValue, true)
val color = ContextCompat.getColor(this, typedValue.resourceId)

How to get a value of color attribute programmatically

4 Answers4

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