如何创建一个可选择的循环ImageView
就像当前用于个人资料图片的 Google+ 应用程序一样?
这就是我所指的:
上图未选中,下图已选中。
我尝试一比一复制个人资料图片。
到目前为止我的工作:
loadedImage
is the Bitmap
显示的是
mImageView.setBackground(createStateListDrawable());
mImageView.setImageBitmap(createRoundImage(loadedImage));
使用的方法:
private Bitmap createRoundImage(Bitmap loadedImage) {
Bitmap circleBitmap = Bitmap.createBitmap(loadedImage.getWidth(), loadedImage.getHeight(), Bitmap.Config.ARGB_8888);
BitmapShader shader = new BitmapShader(loadedImage, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
Paint paint = new Paint();
paint.setAntiAlias(true);
paint.setShader(shader);
Canvas c = new Canvas(circleBitmap);
c.drawCircle(loadedImage.getWidth() / 2, loadedImage.getHeight() / 2, loadedImage.getWidth() / 2, paint);
return circleBitmap;
}
private StateListDrawable createStateListDrawable() {
StateListDrawable stateListDrawable = new StateListDrawable();
OvalShape ovalShape = new OvalShape();
ShapeDrawable shapeDrawable = new ShapeDrawable(ovalShape);
stateListDrawable.addState(new int[] { android.R.attr.state_pressed }, shapeDrawable);
stateListDrawable.addState(StateSet.WILD_CARD, shapeDrawable);
return stateListDrawable;
}
尺寸ImageView
is imageSizePx
图像的大小是imageSizePx - 3
。所以,这意味着背景应该与图像重叠。这是行不通的。
非常简单的解决方案,感谢@CommonsWare 的提示。
Size of Bitmap
: imageSizePx - 3DP
尺寸为ImageView
: 图像大小Px
mImageView.setBackground(createStateListDrawable(imageSizePx));
mImageView.setImageBitmap(loadedImage);
private StateListDrawable createStateListDrawable(int size) {
StateListDrawable stateListDrawable = new StateListDrawable();
OvalShape ovalShape = new OvalShape();
ovalShape.resize(size, size);
ShapeDrawable shapeDrawable = new ShapeDrawable(ovalShape);
shapeDrawable.getPaint().setColor(getResources().getColor(R.color.somecolor));
stateListDrawable.addState(new int[]{android.R.attr.state_pressed}, shapeDrawable);
stateListDrawable.addState(new int[]{android.R.attr.state_focused}, shapeDrawable);
stateListDrawable.addState(new int[]{}, null);
return stateListDrawable;
}
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