在Android的位图的圆形作物 [英] bitmap circular crop in android

问题描述

我有显示半透明圈下的一个方形位图。用户可触摸并拖动位图定位。我希望能够裁剪位图的一部分，曾经是圆下。我怎样才能做到这一点？

i have a square bitmap being displayed underneath a semi transparent circle. The user can touch and drag the bitmap to position it. I want to be able to crop what ever part of the bitmap is under the circle. How can i do this?

推荐答案

看看<一个href=\"http://developer.android.com/reference/android/support/v4/graphics/drawable/RoundedBitmapDrawable.html\">RoundedBitmapDrawable在支持库

你所要做的就是把位图和圆角半径

all you have to do is give it the bitmap and the corner radius

RoundedBitmapDrawable img = RoundedBitmapDrawableFactory.create(getResources(),bitmap);
img.setCornerRadius(radius);

imageView.setImageDrawable(img);

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