通知大图标圆圈

Question

我想显示一个循环的化身从用户的联系人作为通知的大图标-就像当收到一个文本或邮件。当我将大图标设置为联系人的图像时，它会产生一个方形图标。

我希望看到的东西看起来像顶部的图标(方形的化身)，看起来像电子邮件通知上的大图标(圆形头像)：

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我怎样才能使它变圆呢？

Answer 1

由于setLargeIcon()接受Bitmap，所以您所需要做的就是从源创建循环Bitmap。

下面是来自在Android中创建一个圆圈位图的代码(我还没试过)。

private Bitmap getCircleBitmap(Bitmap bitmap) {
    final Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),
            bitmap.getHeight(), Bitmap.Config.ARGB_8888);
    final Canvas canvas = new Canvas(output);

    final int color = Color.RED;
    final Paint paint = new Paint();
    final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
    final RectF rectF = new RectF(rect);

    paint.setAntiAlias(true);
    canvas.drawARGB(0, 0, 0, 0);
    paint.setColor(color);
    canvas.drawOval(rectF, paint);

    paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
    canvas.drawBitmap(bitmap, rect, rect, paint);

    bitmap.recycle();

    return output;
}

Answer 2

接受的答案要求输入位图是一个完美的方格(相同的高度和宽度)。如果你的位图是矩形的，它将返回一个椭圆形.我修改了代码以接受任何形状的位图，并返回以输入位图中间为中心的圆圈。

public static Bitmap getCircleBitmap(Bitmap bitmap) {
    Bitmap output;
    Rect srcRect, dstRect;
    float r;
    final int width = bitmap.getWidth();
    final int height = bitmap.getHeight();

    if (width > height){
        output = Bitmap.createBitmap(height, height, Bitmap.Config.ARGB_8888);
        int left = (width - height) / 2;
        int right = left + height;
        srcRect = new Rect(left, 0, right, height);
        dstRect = new Rect(0, 0, height, height);
        r = height / 2;
    }else{
        output = Bitmap.createBitmap(width, width, Bitmap.Config.ARGB_8888);
        int top = (height - width)/2;
        int bottom = top + width;
        srcRect = new Rect(0, top, width, bottom);
        dstRect = new Rect(0, 0, width, width);
        r = width / 2;
    }

    Canvas canvas = new Canvas(output);

    final int color = 0xff424242;
    final Paint paint = new Paint();

    paint.setAntiAlias(true);
    canvas.drawARGB(0, 0, 0, 0);
    paint.setColor(color);
    canvas.drawCircle(r, r, r, paint);
    paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
    canvas.drawBitmap(bitmap, srcRect, dstRect, paint);

    bitmap.recycle();

    return output;
}

Answer 3

伊戈尔的回答效果很好。在这里投递代码的情况下链接消失：

private Bitmap getCircleBitmap(Bitmap bitmap) {
 final Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),
  bitmap.getHeight(), Bitmap.Config.ARGB_8888);
 final Canvas canvas = new Canvas(output);

 final int color = Color.RED;
 final Paint paint = new Paint();
 final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
 final RectF rectF = new RectF(rect);

 paint.setAntiAlias(true);
 canvas.drawARGB(0, 0, 0, 0);
 paint.setColor(color);
 canvas.drawOval(rectF, paint);

 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
 canvas.drawBitmap(bitmap, rect, rect, paint);

 bitmap.recycle();

 return output;
}