我第一次使用 RecyclerView
。除了删除项目时没有动画效果之外,其他都正常工作。
我没有设置自定义项动画,但根据文档:
RecyclerView
默认启用添加和删除项目的动画效果。
因此,删除时的动画应该有效。
我想在删除时有默认的动画效果,但无法实现。
这是我设置 RecyclerView 的方式:
private void setupRecyclerView() {
mRecyclerView = (RecyclerView) mRootView.findViewById(R.id.recycler_view);
mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
View emptyView = mRootView.findViewById(R.id.empty_view);
mAdapter = new RoutineAdapter(getActivity(), mRoutineItems, emptyView);
mRecyclerView.setAdapter(mAdapter);
}
这是我的适配器:
private class RoutineAdapter
extends RecyclerView.Adapter<RoutineAdapter.ViewHolder> {
private final Context mContext;
private List<RoutineItem> mData;
private View mEmptyView;
public RoutineAdapter(Context context, List<RoutineItem> data, View emptyView) {
mContext = context;
mData = data;
mEmptyView = emptyView;
setEmptyViewVisibility();
}
public void add(RoutineItem routineItem, int position) {
mData.add(position, routineItem);
setEmptyViewVisibility();
notifyItemInserted(position);
}
public void remove(int position){
mData.remove(position);
setEmptyViewVisibility();
notifyItemRemoved(position);
}
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
final View view = LayoutInflater.from(mContext).inflate(
R.layout.fragment_routines_list_item, parent, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(ViewHolder holder, final int position) {
final RoutineItem routineItem = getItem(position);
holder.circle.setBackgroundResource(
colorNumberToDrawableResource(routineItem.colorNumber));
holder.initial.setText(routineItem.routineName.substring(0, 1));
holder.routineName.setText(routineItem.routineName);
holder.lastTimeDone.setText(routineItem.lastTimeDoneText);
if (routineItem.isSelected) {
holder.itemView.setBackgroundColor(
getResources().getColor(R.color.background_item_selected));
} else {
holder.itemView.setBackgroundResource(
R.drawable.darker_background_on_pressed);
}
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mPresenter.onRoutineClicked(routineItem.routineName);
}
});
holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
mPresenter.onRoutineLongClicked(routineItem.routineName);
return true;
}
});
}
@Override
public int getItemCount() {
return mData.size();
}
public RoutineItem getItem(int position) {
return mData.get(position);
}
private void setEmptyViewVisibility() {
if (getItemCount() == 0) {
mEmptyView.setVisibility(View.VISIBLE);
} else {
mEmptyView.setVisibility(View.GONE);
}
}
class ViewHolder extends RecyclerView.ViewHolder {
public final View circle;
public final TextView initial;
public final TextView routineName;
public final TextView lastTimeDone;
public ViewHolder(View view) {
super(view);
circle = view.findViewById(R.id.circle);
initial = (TextView) view.findViewById(R.id.initial);
routineName = (TextView) view.findViewById(R.id.routine_name);
lastTimeDone = (TextView) view.findViewById(R.id.last_time_done);
}
}
}
Fragment_routines_list_item.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:minHeight="@dimen/standard_list_item_height"
android:paddingBottom="8dp"
android:background="@drawable/darker_background_on_pressed"
android:clickable="true">
......
</RelativeLayout>
我做错了什么导致默认的删除动画无法工作?