在长按行时，我已在循环器视图中实现了一个上下文操作栏。在这里，我在动作模式下显示每行的复选框。并根据标志隐藏，以检查它是否不是动作模式。问题是在操作模式下只显示一行，长按时复选框，其余行隐藏它。我不确定它有什么问题。我附加了我的Recycler适配器类和相应的行XML here。如果您能找到问题所在，请查看并告诉我。
提前致谢！
正如一些机构建议在这里显示代码而不是指向java文件。这是代码
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.RecyclerViewHolder> {
Context context;
List<RssFeed> feeds;
Database database;
FirebaseData db;
String uid;
private static final String TAG = Constants.TAG + " : " + RecyclerViewAdapter.class.getSimpleName();
public RecyclerViewAdapter(Context context, List<RssFeed> feeds) {
this.context = context;
this.feeds = feeds;
database = new Database(context);
db = new FirebaseData(context);
uid = FirebaseAuth.getInstance().getCurrentUser().getUid();
}
@Override
public RecyclerViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.edit_rss_feed_row, parent, false);
final RecyclerViewHolder holder = new RecyclerViewHolder(view, (Activity) context, RecyclerViewAdapter.this);
return holder;
}
@Override
public void onBindViewHolder(final RecyclerViewHolder holder, int position) {
holder.title.setText(feeds.get(position).getRssFeedTitle());
holder.address.setText(feeds.get(position).getRssFeedAddress());
if (!holder.action_mode)
holder.checkBox.setVisibility(View.GONE);
else {
holder.checkBox.setVisibility(View.VISIBLE);
holder.checkBox.setChecked(false);
}
holder.row.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
AlertDialog.Builder dialog = new AlertDialog.Builder(context);
dialog.setTitle(context.getString(R.string.rss_delete_alert_title));
dialog.setMessage(context.getString(R.string.rss_delete_alert_msg));
final int position = holder.getAdapterPosition();
dialog.setNegativeButton(context.getString(R.string.no), null);
dialog.setPositiveButton(context.getString(R.string.yes), new AlertDialog.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
RssFeed feed = feeds.get(position);
deleteFeed(feed);
feeds = new Database(context).getRssFeeds(SharedPrefUtil.getUtil(context, uid).getUserInfo());
notifyDataSetChanged();
}
});
dialog.show();
}
});
}
private void deleteFeed(RssFeed feed){
database.deleteRssFeed(feed);
db.deleteRssFeed(feed);
}
@Override
public int getItemCount() {
return feeds.size();
}
public void removeFeeds(List<RssFeed> list) {
for (RssFeed feed : list)
feeds.remove(feed);
notifyDataSetChanged();
}
class RecyclerViewHolder extends RecyclerView.ViewHolder {
TextView title;
TextView address;
RelativeLayout row;
CheckBox checkBox;
boolean action_mode = false;
ActionMode actionMode;
Activity activity;
RecyclerViewAdapter recyclerViewAdapter;
final ArrayList<RssFeed> removedList = new ArrayList<>();
public RecyclerViewHolder(View item, final Activity activity, RecyclerViewAdapter rView) {
super(item);
this.activity = activity;
recyclerViewAdapter = rView;
row = item.findViewById(R.id.row);
title = item.findViewById(R.id.rssEditFeedTitle);
address = item.findViewById(R.id.rssEditFeedAddress);
checkBox = item.findViewById(R.id.checkBox);
row.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
actionMode = ((AppCompatActivity)activity).startSupportActionMode(new ContextualCallBack(RecyclerViewHolder.this));
return true;
}
});
checkBox.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (((CheckBox) v).isChecked())
removedList.add(feeds.get(getAdapterPosition()));
else removedList.remove(feeds.get(getAdapterPosition()));
}
});
}
}
class ContextualCallBack implements ActionMode.Callback {
RecyclerViewHolder holder;
ContextualCallBack(RecyclerViewHolder holder) {
this.holder = holder;
}
@Override
public boolean onCreateActionMode(ActionMode mode, Menu menu) {
mode.getMenuInflater().inflate(R.menu.edit_rss_feed_action_mode_menu, menu);
holder.action_mode = true;
holder.recyclerViewAdapter.notifyDataSetChanged();
return true;
}
@Override
public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
mode.setTitle(R.string.app_name);
return false;
}
@Override
public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
int id = item.getItemId();
if (id == R.id.delete) {
holder.recyclerViewAdapter.removeFeeds(holder.removedList);
for(RssFeed feed:holder.removedList)
holder.recyclerViewAdapter.deleteFeed(feed);
holder.recyclerViewAdapter.notifyDataSetChanged();
}
return false;
}
@Override
public void onDestroyActionMode(ActionMode mode) {
holder.action_mode = false;
holder.recyclerViewAdapter.notifyDataSetChanged();
}
}
}
这是每行的XML
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/row"
android:descendantFocusability="blocksDescendants"
tools:context="com.rss.feedster.rss_feedster.EditRssFeedFragment">
<EditText
android:id="@+id/rssEditFeedTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="textPersonName"
android:text="Title RSS Feed"
android:textAppearance="@android:style/TextAppearance.DeviceDefault.Medium"
android:textStyle="bold" />
<EditText
android:id="@+id/rssEditFeedAddress"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/rssEditFeedTitle"
android:layout_alignLeft="@id/rssEditFeedTitle"
android:text="Description Text View"
android:textAppearance="@android:style/TextAppearance.Small" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignParentEnd="true"
android:layout_marginRight="15dp"
android:text="Tab to remove" />
<CheckBox
android:id="@+id/checkBox"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignEnd="@+id/textView2"
android:layout_below="@+id/rssEditFeedTitle"
android:visibility="visible"/>
</RelativeLayout>
更多信息：我忘记包含的一件事是回收器视图正在导航抽屉布局中的片段中使用。
最后，我得到了这里的错误。我把标志（action_mode）用于检查它是否是动作模式，在持有者对象本身内，这意味着该标志一次只能用于一个持有者对象（行）。当我将它移动到适配器对象时，一切都像魅力一样。