Android代码设置Shape,corners,Gradient

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int strokeWidth = 5; // 3dp 边框宽度    int roundRadius = 15; // 8dp 圆角半径    int strokeColor = Color.parseColor("#2E3135");//边框颜色    int fillColor = Color.parseColor("#DFDFE0");//内部填充颜色    GradientDrawable gd = new GradientDrawable();//创建drawable    gd.setColor(fillColor);    gd.setCornerRadius(roundRadius);    gd.setStroke(strokeWidth, strokeColor);

setBackgroundDrawable(gd);
但是如果想设置Gradient的渐变色该咋办呢？
方法是改变GradientDrawable的创建方法：
int colors[] = { 0xff255779 , 0xff3e7492, 0xffa6c0cd };//分别为开始颜色，中间夜色，结束颜色GradientDrawable gd = new GradientDrawable(GradientDrawable.Orientation.TOP_BOTTOM, colors);
参考：
http://stackoverflow.com/questions/17667964/how-to-create-shape-with-solid-corner-stroke-in-java-code
http://stackoverflow.com/questions/4177401/gradientdrawable-in-code
http://www.iteye.com/topic/1117635

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