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我想在圖像上創建一個「發光」效果。在黑暗中它幾乎工作,但明亮的圖像,你可以看到像一個灰色的矩形,如下面的圖像所見:android圖像漸變
這裏是我的代碼:
public static Bitmap drawModifiedImage(Bitmap bitmap) {
Canvas bigCanvas = new Canvas(bitmap);
Bitmap b = Bitmap.createBitmap(bitmap.getWidth(), 20, Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(b);
c.drawColor(Color.TRANSPARENT);
LinearGradient grad = new LinearGradient(bitmap.getWidth()/2, 0, bitmap.getWidth()/2, 20, Color.WHITE, Color.TRANSPARENT, Shader.TileMode.CLAMP);
Paint p = new Paint();
p.setStyle(Paint.Style.FILL);
p.setShader(grad);
c.drawRect(0, 0, bitmap.getWidth(), 20, p);
bigCanvas.drawBitmap(bitmap, 0, 0, null);
bigCanvas.drawBitmap(b,0,0, null);
return bitmap;
}
我在做什麼錯誤?
是不是0X00FFFFFF白色? – Wayner 2011-03-09 11:00:27
是的,但它是透明的 – 2011-03-09 13:27:16