我在RecycleView中遇到了问题。我的屏幕有两个标签，两个标签都包含recycleview。它通常在大多数时间调用，但有时会显示空白屏幕。只是我写了log＆amp; system.out并发现了这个问题。我将在此粘贴我的适配器类代码。
public class ExpandableListAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
public static final int HEADER = 0;
public static final int CHILD = 1;
List<ContentTitle> titles;
Context context;
private List<Item> titleData = new ArrayList<Item>();
public ExpandableListAdapter(List<Item> data) {
this.titleData = data;
System.out.println("===this.titleData===" + this.titleData.size());
}
public void replaceContentFragment(String title,int id,int bookmarked) {
try {
SkillsApp SkillsApp = (SkillsApp) context.getApplicationContext();
Fragment fragment = new ContentActivityFragment();
FragmentManager fragmentManager = skillsUSAApp.mainActivity.getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.container_body, fragment);
fragmentTransaction.commit();
SkillsApp.subtitleID = id;
SkillsApp.isbookmark = (bookmarked == 0)? false:true;
SkillsApp.mainActivity.getSupportActionBar().setTitle(title);
SkillsApp.selectedSubtitleID = id;
}catch (Exception e){
e.printStackTrace();
}
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int type) {
View view = null;
try{
context = parent.getContext();
final SkillsApp skillsApp = (SkillsAApp)context.getApplicationContext();
if(!skillsApp.isDrawer){
switch (type) {
case HEADER:
LayoutInflater inflater = (LayoutInflater) parent.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.main_title, parent, false);
ListHeaderViewHolder header = new ListHeaderViewHolder(view);
return header;
case CHILD:
LayoutInflater inflater1 = (LayoutInflater) parent.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater1.inflate(R.layout.sub_title, parent, false);
view.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Log.d("Child", "child");
TextView text = (TextView) view.findViewById(R.id.header_title);
}
});
return new RecyclerView.ViewHolder(view) {
};
}
}
}catch (Exception e){
e.printStackTrace();
}
return null;
}
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
try{
System.out.println("==========##########");
final Item item = titleData.get(position);
final SkillsAApp skillsAApp = (SkillsAApp)context.getApplicationContext();
System.out.println("===onBindViewHolder item===" + item.mainTitle.title);
switch (item.type) {
case HEADER:
final ListHeaderViewHolder itemController = (ListHeaderViewHolder) holder;
itemController.refferalItem = item;
itemController.header_title.setText(item.mainTitle.title);
if (item.invisibleChildren == null) {
itemController.btn_expand_toggle.setImageResource(R.drawable.right_filled_arrow);
} else {
itemController.btn_expand_toggle.setImageResource(R.drawable.right_filled_arrow);
}
itemController.layoutItem.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
try{
if(!skillsAApp.isDrawer){
if (item.invisibleChildren == null) {
item.invisibleChildren = new ArrayList<Item>();
int count = 0;
int pos = titleData.indexOf(itemController.refferalItem);
while (titleData.size() > pos + 1 && titleData.get(pos + 1).type == CHILD) {
item.invisibleChildren.add(titleData.remove(pos + 1));
count++;
}
notifyItemRangeRemoved(pos + 1, count);
notifyDataSetChanged();
itemController.btn_expand_toggle.setImageResource(R.drawable.right_filled_arrow);
} else {
int pos = titleData.indexOf(itemController.refferalItem);
int index = pos + 1;
for (Item i : item.invisibleChildren) {
titleData.add(index, i);
index++;
}
notifyItemRangeInserted(pos + 1, index - pos - 1);
notifyDataSetChanged();
itemController.btn_expand_toggle.setImageResource(R.drawable.down_arrow);
item.invisibleChildren = null;
}
}
}catch (Exception e){
e.printStackTrace();
}
}
});
break;
case CHILD:
View itemTextView = (View) holder.itemView;
TextView view = (TextView) itemTextView.findViewById(R.id.header_title);
view.setText(titleData.get(position).subtitle.title);
final int pos = position;
itemTextView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
try{
if(!skillsUSAApp.isDrawer){
TextView text = (TextView) view.findViewById(R.id.header_title);
FlurryAgent.logEvent("Sub Category Item");
replaceContentFragment(text.getText().toString(), titleData.get(pos).subtitle.subtitleId, titleData.get(pos).subtitle.bookMarked);
}
}catch (Exception e){
e.printStackTrace();
}
}
});
break;
}
}catch (Exception e){
e.printStackTrace();
}
}
@Override
public int getItemViewType(int position) {
return titleData.get(position).type;
}
@Override
public int getItemCount() {
return titleData.size();
}
@Override
public long getItemId(int position) {
return position;
}
private static class ListHeaderViewHolder extends RecyclerView.ViewHolder {
public TextView header_title;
public ImageView btn_expand_toggle;
public Item refferalItem;
public RelativeLayout layoutItem;
public ListHeaderViewHolder(View itemView) {
super(itemView);
try{
header_title = (TextView) itemView.findViewById(R.id.header_title);
btn_expand_toggle = (ImageView) itemView.findViewById(R.id.btn_expand_toggle);
layoutItem = (RelativeLayout) itemView.findViewById(R.id.ll_title);
}catch (Exception e){
e.printStackTrace();
}
}
}
public static class Item {
public int type;
public String text;
public ContentTitle mainTitle;
public ContentSubTitle subtitle;
public List<Item> invisibleChildren;
public Item(int type, String text, List<Item> children) {
this.type = type;
this.text = text;
this.invisibleChildren = children;
}
public Item(int type, ContentTitle title,ContentSubTitle stitle) {
this.type = type;
this.mainTitle = title;
this.subtitle=stitle;
}
public Item(int type, String text) {
this.type = type;
this.text = text;
}
}
}
这是来自标签片段
的调用适配器recyclerview = (RecyclerView) v.findViewById(R.id.recyclerview);
recyclerview.setLayoutManager(new LinearLayoutManager(v.getContext(), LinearLayoutManager.VERTICAL, false));
// recyclerview.setLayoutManager(new LinearLayoutManager(v.getContext()));
ExpandableListAdapter adapter = new ExpandableListAdapter(items);
recyclerview.setAdapter(adapter);
adapter.notifyDataSetChanged();