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int[] mcolor = new int[] { R.color.ffdarkred, R.color.ffdarkseagreen };      GradientDrawable mHueGradient = new GradientDrawable(GradientDrawable.Orientation.LEFT_RIGHT,        mcolor);      strObj.setProgressDrawable(mHueGradient);

      mHueGradient.setCornerRadius(15);       mHueGradient.setStroke(10, -1);       strObj.setProgressDrawable(mHueGradient);

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原文：http://www.cnblogs.com/Capricorn-HCL/p/5069271.html