有人成功使用RoundedBitmapDrawable吗？如果我理解的不对，请纠正我，但据我所知，它可以将常规矩形图像变成圆形图像。
到目前为止，我尝试的是这个：
RoundedBitmapDrawable.createRoundedBitmapDrawable(getResources(), BitmapFactory.decodeResource(getResources(), iconResource))
我尝试实现的目标是：将任何图像转换为圆形图像并使用ImageView显示。
如果我把事情搞混了，或者我所说的一切都是无意义的。是否可能（或更简单）使用任何新框架来完成它？（Android L或新的Support库）
您需要设置圆角半径。
Resources res = getResources();
Bitmap src = BitmapFactory.decodeResource(res, iconResource);
RoundedBitmapDrawable dr =
RoundedBitmapDrawableFactory.create(res, src);
dr.setCornerRadius(Math.max(src.getWidth(), src.getHeight()) / 2.0f);
imageView.setImageDrawable(dr);
dr.setCornerRadius(Math.min(dr.getMinimumWidth(),dr.getMinimumHeight()？ - gian1200dr.setCircular(true)。 - don't panic可能有些晚了，但我希望对其他人有所帮助。
如果您的图像具有相同的宽度和高度，则可以将 setCircular 设置为 true，以获得圆形位图，如下所示。
RoundedBitmapDrawable drawable = RoundedBitmapDrawableFactory.create(getResources(),your_bitmap);
drawable.setCircular(true);
RoundedBitmapDrawable，那么我该如何从中获取圆角位图？使用 getBitmap 方法只能返回原始位图。 - Cerlin我也在寻找圆形图片视图，为了效率，我搜索了所有第三方库，发现它们都会创建新的位图，这在列表中是一项繁琐的任务，会消耗更多的内存。
参考库：
我使用了这个库
因为这是一个快速的ImageView（和Drawable），支持基于Romain Guy原始示例的圆角（以及椭圆形或圆形）。
完整代码：
ImageView img= (ImageView) findViewById(R.id.yourimageid);
Bitmap bitmap = BitmapFactory.decodeResource(getResources(),R.drawable.yourpictureresource);
RoundedBitmapDrawable rnd = (RoundedBitmapDrawable) RoundedBitmapDrawableFactory.create(getResources(), bitmap);
rnd.setCircular(true);
img.setImageDrawable(rnd);
public class RoundedBitmapDrawableUtility {
public static RoundedBitmapDrawable getRoundedSquareBitmapDrawable(Context context, Bitmap originalBitmap, int cornerRadius){
return getRoundedSquareBitmapDrawable(context, originalBitmap, cornerRadius, -1, -1);
}
public static RoundedBitmapDrawable getRoundedSquareBitmapDrawable(Context context, Bitmap originalBitmap, int cornerRadius, int borderWidth, int borderColor){
int originalBitmapWidth = originalBitmap.getWidth();
int originalBitmapHeight = originalBitmap.getHeight();
if(borderWidth != -1 && borderColor != -1){
Canvas canvas = new Canvas(originalBitmap);
canvas.drawBitmap(originalBitmap, 0, 0, null);
Paint borderPaint = new Paint();
borderPaint.setStyle(Paint.Style.STROKE);
borderPaint.setStrokeWidth(borderWidth);
borderPaint.setAntiAlias(true);
borderPaint.setColor(borderColor);
int roundedRectDelta = (borderWidth/3);
RectF rectF = new RectF(0 + roundedRectDelta, 0 + roundedRectDelta, originalBitmapWidth - roundedRectDelta, originalBitmapHeight - roundedRectDelta);
canvas.drawRoundRect(rectF, cornerRadius, cornerRadius, borderPaint);
}
RoundedBitmapDrawable roundedImageBitmapDrawable = RoundedBitmapDrawableFactory.create(context.getResources(), originalBitmap);
roundedImageBitmapDrawable.setCornerRadius(cornerRadius);
roundedImageBitmapDrawable.setAntiAlias(true);
return roundedImageBitmapDrawable;
}
public static RoundedBitmapDrawable getCircleBitmapDrawable(Context context, Bitmap originalBitmap){
return getCircleBitmapDrawable(context, originalBitmap, -1, -1);
}
public static RoundedBitmapDrawable getCircleBitmapDrawable(Context context, Bitmap originalBitmap, int borderWidth, int borderColor){
if(borderWidth != -1 && borderColor != -1) {
Canvas canvas = new Canvas(originalBitmap);
canvas.drawBitmap(originalBitmap, 0, 0, null);
Paint borderPaint = new Paint();
borderPaint.setStyle(Paint.Style.STROKE);
borderPaint.setStrokeWidth(borderWidth);
borderPaint.setAntiAlias(true);
borderPaint.setColor(borderColor);
int circleDelta = (borderWidth / 2) - DisplayUtility.dp2px(context, 1);
int radius = (canvas.getWidth() / 2) - circleDelta;
canvas.drawCircle(canvas.getWidth() / 2, canvas.getHeight() / 2, radius, borderPaint);
}
RoundedBitmapDrawable roundedImageBitmapDrawable = RoundedBitmapDrawableFactory.create(context.getResources(), originalBitmap);
roundedImageBitmapDrawable.setCircular(true);
roundedImageBitmapDrawable.setAntiAlias(true);
return roundedImageBitmapDrawable;
}
}
public static Bitmap scaleBitmapAndKeepRation(Bitmap TargetBmp, int reqHeightInPixels, int reqWidthInPixels) {
if (TargetBmp != null) {
if (TargetBmp.getWidth() >= TargetBmp.getHeight()) {
TargetBmp = Bitmap.createBitmap(
TargetBmp,
TargetBmp.getWidth() / 2 - TargetBmp.getHeight() / 2,
0,
TargetBmp.getHeight(),
TargetBmp.getHeight()
);
} else {
TargetBmp = Bitmap.createBitmap(
TargetBmp,
0,
TargetBmp.getHeight() / 2 - TargetBmp.getWidth() / 2,
TargetBmp.getWidth(),
TargetBmp.getWidth()
);
}
if (TargetBmp != null) {
try {
Matrix m = new Matrix();
m.setRectToRect(new RectF(0, 0, TargetBmp.getWidth(), TargetBmp.getHeight()), new RectF(0, 0, reqWidthInPixels, reqHeightInPixels), Matrix.ScaleToFit.FILL);
Bitmap scaledBitmap = Bitmap.createBitmap(TargetBmp, 0, 0, TargetBmp.getWidth(), TargetBmp.getHeight(), m, true);
return scaledBitmap;
} catch (Exception e) {
Log.e("Utils", e.toString());
return null;
}
}
return null;
} else
return null;
}
当前RoundedBitmapDrawable在非正方形图片上的效果不太好，会使内容拉伸。
我建议使用替代方法，如我在这里所写的： 如何实现一个圆形且居中裁剪的imageView，而不需要创建新的位图？
// set round image
RoundedBitmapDrawable dr = RoundedBitmapDrawableFactory.create(getResources(), avatarImgPath);
dr.setCircular(true);
avatarImageView.setImageDrawable(dr);