在imageview中淡化图像边框 [英] Fading the image border in an imageview

问题描述

我需要在ImageView上添加淡入淡出效果. 在我的情况下，我有一个RelativeLayout，相对背景为黄色，在该背景的中心有一个ImageView.现在，我需要在ImageView的边缘上应用淡入淡出效果.这可能吗? (Android api 11+)

I need to add a fading effect on a ImageView. In my situation I have a RelativeLayout, the relative background in yellow and in the center of that background there is a ImageView. Now I need to apply a fade affect on the edge of the ImageView. Is this possible? (Android api 11+)

我尝试过:

android:requiresFadingEdge="horizontal"
android:fadingEdge="horizontal"
android:fadingEdge="vertical"
android:fadingEdgeLength="40px"

但不起作用.

这是我想要的例子.就像您可以看到顶部和左侧正在褪色，而右侧和底部边缘未在褪色..

This is an example of what I want. Like you can see the top and the left are fading, the right and bottom edge, instead, are not fading..

非常感谢！

推荐答案

重写ImageView中的方法，如下所示:

Override methods in ImageView as written below:

private float FadeStrength = 1.0f;
private int FadeLength = 40px;

@Override
protected float getTopFadingEdgeStrength() {
    return FadeStrength;
}

@Override
protected float getBottomFadingEdgeStrength() {
    return FadeStrength;
}

@Override
protected float getLeftFadingEdgeStrength() {
    return FadeStrength;
}

@Override
protected float getRightFadingEdgeStrength() {
    return FadeStrength;
}

在初始化视图时添加行:

And on initialization of view add lines:

setFadingEdgeLength(FadeLength);
setVerticalFadingEdgeEnabled(true);
setHorizontalFadingEdgeEnabled(true);

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