用LayerDrawable实现两个图片的叠加效果

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        		Drawable[] layers = new Drawable[2];
        		layers[0] = new ColorDrawable(primaryColor);
        		layers[1] = new ColorDrawable(0x7f000000);
        		LayerDrawable layerDrawable = new LayerDrawable(layers);
        		layerDrawable.setLayerInset(0, 0, 0, 0, 0);
        		layerDrawable.setLayerInset(1, 0, 0, 0, 0);
        		setBackground(layerDrawable);

用LayerDrawable实现两个图片的叠加效果

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原文地址：http://blog.csdn.net/heqiangflytosky/article/details/46820869