如何在 Android 的画布上绘制平滑/抖动渐变
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/2936803/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How to draw a smooth/dithered gradient on a canvas in Android
提问by André
Several answers mention to use GradientDrawable.setDither(true) to draw smooth gradients in Android. That has no effect in my code. Any idea what I have to change to get a well looking gradient in my live wallpaper?
几个答案提到使用 GradientDrawable.setDither(true) 在 Android 中绘制平滑渐变。这对我的代码没有影响。知道我必须改变什么才能在我的动态壁纸中获得漂亮的渐变吗？
GradientDrawable gradient = new GradientDrawable(Orientation.TL_BR, colors);
gradient.setGradientType(GradientDrawable.RADIAL_GRADIENT);
gradient.setGradientRadius(canvas.getWidth() * 2);
gradient.setDither(true);
gradient.setGradientCenter(-0.1f, -0.1f);
gradient.setBounds(cb);
gradient.draw(canvas);
回答by Eric Schlenz
Seeing as you have a Canvas to work with. Here is one option.
看到你有一个画布可以使用。这是一种选择。
private Bitmap makeRadGrad() {
RadialGradient gradient = new RadialGradient(200, 200, 200, 0xFFFFFFFF,
0xFF000000, android.graphics.Shader.TileMode.CLAMP);
Paint p = new Paint();
p.setDither(true);
p.setShader(gradient);
Bitmap bitmap = Bitmap.createBitmap(400, 400, Config.ARGB_8888);
Canvas c = new Canvas(bitmap);
c.drawCircle(200, 200, 200, p);
return bitmap;
}
Result:
结果：
