如何在RecyclerView上增加当前关注的项目的大小? [英] How to increase the size of a current focused item on a RecyclerView?
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问题描述
我正在尝试使用RecyclerView
制作水平列表,当我将重点放在某个项目上时,请增加该项目的大小.我想产生这种效果:
I'm trying to make an horizontal list with a RecyclerView
, that when I put the focus on an item, increase the size of this. I want to make this effect:
您有什么想法可以实现这一目标吗?
Do you have any ideas to accomplish this?
推荐答案
感谢 dextor 的答案,我可以弄清楚这个答案.
Thanks to dextor answer, I could figure out this answer.
我已经使用FocusChangeListener
并添加了动画状态来更改视图的大小:
I've used the FocusChangeListener
and added animation states to change the size of the view:
static class ViewHolder extends RecyclerView.ViewHolder {
public ViewHolder(final View root) {
// bind views
// ...
// bind focus listener
root.setOnFocusChangeListener(new View.OnFocusChangeListener() {
@Override
public void onFocusChange(View v, boolean hasFocus) {
if (hasFocus) {
// run scale animation and make it bigger
Animation anim = AnimationUtils.loadAnimation(context, R.anim.scale_in_tv);
root.startAnimation(anim);
anim.setFillAfter(true);
} else {
// run scale animation and make it smaller
Animation anim = AnimationUtils.loadAnimation(context, R.anim.scale_out_tv);
root.startAnimation(anim);
anim.setFillAfter(true);
}
}
});
}
以及动画代码:
scale_in_tv:
scale_in_tv:
<scale xmlns:android="http://schemas.android.com/apk/res/android"
android:duration="300"
android:fromXScale="100%"
android:fromYScale="100%"
android:toXScale="110%"
android:toYScale="110%"
android:pivotX="50%"
android:pivotY="50%">
</scale>
scale_out_tv:
scale_out_tv:
<scale xmlns:android="http://schemas.android.com/apk/res/android"
android:duration="100"
android:fromXScale="110%"
android:fromYScale="110%"
android:toXScale="100%"
android:toYScale="100%"
android:pivotX="50%"
android:pivotY="50%">
</scale>
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