如何从 GradientDrawable 获取颜色

首先，我将绿色设置为View mIcon的背景，

View mIcon = findViewById(R.id.xxx);

GradientDrawable gdraw = (GradientDrawable) mContext.getResources().getDrawable(R.drawable.roundbtn_white_normal);
gdraw.setColor(Color.GREEN);
mIcon.setBackgroundDrawable(gdraw);

然后，我不知道如何从该视图的背景中获取颜色......没有 getColor() 功能...

到目前为止，下面的课程对我来说效果很好。

import android.content.res.Resources;
...

// it's the same with the GradientDrawable, just make some proper modification to make it compilable
public class ColorGradientDrawable extends Drawable {
    ...
    private int mColor; // this is the color which you try to get
    ...
    // original setColor function with little modification
    public void setColor(int argb) {
        mColor = argb;
        mGradientState.setSolidColor(argb);
        mFillPaint.setColor(argb);
        invalidateSelf();
    }

    // that's how I get the color from this drawable class
    public int getColor() {
        return mColor;
    }
    ...

    // it's the same with GradientState, just make some proper modification to make it compilable
    final public static class GradientState extends ConstantState {
        ...
    }
}