像Google+这样的可选圆形图像视图

Question

如何ImageView在用于个人资料照片的当前Google+应用中创建可选择的循环？

这就是我所说的:

取消选择上面的图像,然后选择下面的图像.

我尝试复制配置文件图片1到1.

到目前为止我的工作:

loadedImage是Bitmap其上显示

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;
}

的大小ImageView就是imageSizePx和图像的大小imageSizePx - 3.因此,这意味着背景应该与图像重叠.哪个不起作用.

Answer 1

非常简单的解决方案,感谢@CommonsWare的提示.

尺寸Bitmap:imageSizePx - 3DP
尺寸ImageView:imageSizePx

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;
}