Apply ColorFilter / ColorMatrix to turn image completely white

Question

I have a circular ProgressBar on my Toolbar to show some indeterminate progress happening, however the default style of the ProgressBar (the only one I know that makes it into a circular ring) is the same color as the toolbar (the 'colorPrimary' color).

The styles I tried are ?android:attr/progressBarStyleLarge and ?android:attr/progressBarStyleLargeInverse, both get the same color as the toolbar, hence they are not visible.

I read that I can change the color by applying a color filter as such:

toolbarProgress.getIndeterminateDrawable().setColorFilter(Color.WHITE, PorterDuff.Mode.MULTIPLY);

However, I cannot find a single 'PorferDuff.Mode' that turns a colored image into a completely white image (while keeping the alpha transparency intact).

Instead of using the PorterDuff modes I can also apply a ColorMatrix. For example to turn it into grayscale I can use this:

        ColorMatrixColorFilter filter = new ColorMatrixColorFilter(new float[] {
            0.5f, 0.5f, 0.5f, 0, 0,
            0.5f, 0.5f, 0.5f, 0, 0,
            0.5f, 0.5f, 0.5f, 0, 0,
            0, 0, 0, 1, 0
    });
    toolbarProgress.getIndeterminateDrawable().setColorFilter(filter);

Same problem here: I can't find the correct matrix that turns the image completely white. Grayscale comes close but it turns into a grayish color and not pure white.

What I want is to turn all colored pixels into pure white, and leave all alpha pixels transparent.

Unless there is an easier way to change the color of the native ProgressBar..?

Answer 1

是否必须ColorMatrixColorFilter？您可以使用DrawableCompat来设置Drawables。

Drawable drawable = DrawableCompat.wrap(progressBar.getIndeterminateDrawable());
DrawableCompat.setTint(drawable, Color.WHITE);
toolbarProgress.setIndeterminateDrawable(drawable);