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Android Viewpager EdgeEffect custom Color

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8
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CC BY-SA 3.0

You can set the EdgeEffect color of the ViewPager with some reflection:

java
public static void setEdgeGlowColor(ViewPager viewPager, int color) {
    try {
        Class<?> clazz = ViewPager.class;
        for (String name : new String[] {
                "mLeftEdge", "mRightEdge"
        }) {
            Field field = clazz.getDeclaredField(name);
            field.setAccessible(true);
            Object edge = field.get(viewPager); // android.support.v4.widget.EdgeEffectCompat
            Field fEdgeEffect = edge.getClass().getDeclaredField("mEdgeEffect");
            fEdgeEffect.setAccessible(true);
            setEdgeEffectColor((EdgeEffect) fEdgeEffect.get(edge), color);
        }
    } catch (Exception ignored) {
    }
}

public static void setEdgeEffectColor(EdgeEffect edgeEffect, int color) {
    try {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            edgeEffect.setColor(color);
            return;
        }
        Field edgeField = EdgeEffect.class.getDeclaredField("mEdge");
        Field glowField = EdgeEffect.class.getDeclaredField("mGlow");
        edgeField.setAccessible(true);
        glowField.setAccessible(true);
        Drawable mEdge = (Drawable) edgeField.get(edgeEffect);
        Drawable mGlow = (Drawable) glowField.get(edgeEffect);
        mEdge.setColorFilter(color, PorterDuff.Mode.SRC_IN);
        mGlow.setColorFilter(color, PorterDuff.Mode.SRC_IN);
        mEdge.setCallback(null); // free up any references
        mGlow.setCallback(null); // free up any references
    } catch (Exception ignored) {
    }
}

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