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
– pskink, Commented Mar 19, 2018 at 11:24
@pskink TypedValue{t=0x3/d=0xec "res/color/secondary_text_material_light.xml" a=1 r=0x10601e8} — Ωmega
– Ωmega, Commented Mar 19, 2018 at 11:56

azizbekian · Accepted Answer · 2018-03-19 11:31:44Z

55

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, 2018 at 11:31

answered Mar 19, 2018 at 11:27

azizbekian

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5 Comments

Ωmega Over a year ago

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.

azizbekian Over a year ago

Use obtainStyledAttributes passing down android.R.attr.textAppearance. See an example here.

Ωmega Over a year ago

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

azizbekian Over a year ago

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).

Ωmega Over a year ago

Nope, java.lang.UnsupportedOperationException: Can't convert value at index 0 to color: type=0x1

Rickyslash · Accepted Answer · 2023-08-19 08:22:48Z

3

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)

answered Aug 19, 2023 at 8:22

Rickyslash

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Comments

AskNilesh · Accepted Answer · 2018-03-19 17:53:46Z

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, 2018 at 17:53

AskNilesh

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answered Mar 19, 2018 at 11:44

vihkat

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Comments

James · Accepted Answer · 2022-09-22 21:32:00Z

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, 2022 at 21:32

James

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