,可以通过以下步骤实现:
public Parcelable saveRecyclerViewState() {
if (recyclerView != null) {
return recyclerView.getLayoutManager().onSaveInstanceState();
}
return null;
}
private SparseArray<Parcelable> recyclerViewStates = new SparseArray<>();
public void saveRecyclerViewState(int position, Parcelable state) {
recyclerViewStates.put(position, state);
}
public Parcelable restoreRecyclerViewState(int position) {
Parcelable state = recyclerViewStates.get(position);
recyclerViewStates.remove(position);
return state;
}
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
// 保存当前页面的RecyclerView状态
int currentPosition = viewPager.getCurrentItem();
Parcelable state = fragmentAdapter.saveRecyclerViewState();
saveRecyclerViewState(currentPosition, state);
// 恢复切换后页面的RecyclerView状态
Parcelable newState = restoreRecyclerViewState(position);
if (newState != null) {
fragmentAdapter.restoreRecyclerViewState(newState);
}
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
public Parcelable saveRecyclerViewState() {
if (currentFragment != null) {
return currentFragment.saveRecyclerViewState();
}
return null;
}
public void restoreRecyclerViewState(Parcelable state) {
if (currentFragment != null) {
currentFragment.restoreRecyclerViewState(state);
}
}
通过以上步骤,可以在另一个片段内创建的ViewPager中保存片段内的RecyclerView状态。在切换ViewPager页面时,会保存当前页面的RecyclerView状态,并在切换后的页面恢复RecyclerView的状态。这样可以确保在切换页面时,RecyclerView的滚动位置和数据都能正确保存和恢复。
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