如何增加 RecyclerView 上当前焦点项目的大小? [英] How to increase the size of a current focused item on a RecyclerView?

问题描述

我正在尝试使用 RecyclerView 制作一个水平列表，当我将焦点放在一个项目上时，增加它的大小.我想做这个效果:

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:

你有什么想法来实现这个目标吗?

Do you have any ideas to accomplish this?

推荐答案

感谢 dextor 的回答，我可以弄清楚这个答案.

Thanks to dextor answer, I could figure out this answer.

我使用了 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);
             }
         }
    });
}

以及动画的代码:

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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