Android的按钮，外发光 [英] Android button with outer glow

问题描述

我知道这个话题已经没有讨论，但我没有找到真的是我想做的事情。

I know this topic has been discussed yet but I didn't find really what I wanna do.

我有那些按键（截图在底部）。现在，我想添加外发光。是否有其他的可能性，做到这一点不是保存它作为绘制文件夹png格式？这将使少得多的工作。

I have those buttons (screenshot at the bottom). Now I want to add a outer glow. Is there an other possibility to do this than saving it as .png in the drawable folder? That would make much less work.

问候
尼尔斯

推荐答案

试试这个code

public Bitmap setGlow(int resourceId) {
    Bitmap bmp = null;
    try {
        int margin = 30;
        int halfMargin = margin / 2;

        int glowRadius = 15;

        int glowColor = Color.rgb(0, 192, 200);

        Bitmap src = BitmapFactory.decodeResource(getResources(),
                resourceId);

        Bitmap alpha = src.extractAlpha();

        bmp = Bitmap.createBitmap(src.getWidth() + margin, src.getHeight()
                + margin, Bitmap.Config.ARGB_8888);

        Canvas canvas = new Canvas(bmp);

        Paint paint = new Paint();
        paint.setColor(glowColor);

        paint.setMaskFilter(new BlurMaskFilter(glowRadius, Blur.OUTER));
        canvas.drawBitmap(alpha, halfMargin, halfMargin, paint);

        canvas.drawBitmap(src, halfMargin, halfMargin, null);

    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return bmp;
}

和设置您的视图返回的位图

and set the returned bitmap on your view

在您的ImageButton这样设置

set in your imagebutton like this

btnClick.setImageBitmap（setGlow（R.drawable.ic_launcher））;

btnClick.setImageBitmap(setGlow(R.drawable.ic_launcher));

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