将滚动侦听器添加到 RecylerView
如果用户向下滚动 - 则开始翻译动画向上
如果用户向上滚动 - 则开始翻译动画向下
动画翻译向上:-(trans_upwards.xml)
<?xml version="1.0" encoding="utf-8"?>
<set
xmlns:android="http://schemas.android.com/apk/res/android"
android:interpolator="@android:anim/linear_interpolator"
android:fillAfter="true">
<translate
android:fromYDelta="0%p"
android:toYDelta="100%p"
android:duration="300"
/>
</set>
动画翻译向下:-(trans_downwards.xml)
<?xml version="1.0" encoding="utf-8"?>
<set
xmlns:android="http://schemas.android.com/apk/res/android"
android:interpolator="@android:anim/linear_interpolator"
android:fillAfter="true">
<translate
android:fromYDelta="100%p"
android:toYDelta="0%p"
android:duration="300"
/>
</set>
将滚动侦听器添加到 recyclerView (并进行检查)
boolean check_ScrollingUp = false;
mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
if (dy > 0) {
// Scrolling up
if(check_ScrollingUp)
{
YourView.startAnimation(AnimationUtils.loadAnimation(context,R.anim.trans_downwards));
check_ScrollingUp = false;
}
} else {
// User scrolls down
if(!check_ScrollingUp )
{
YourView
.startAnimation(AnimationUtils
.loadAnimation(context,R.anim.trans_upwards));
check_ScrollingUp = true;
}
}
}
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
}
});