我想通过searchView过滤recycleView。 我将xml文件添加到菜单。 当应用程序运行时，片段打开时她停止了。 当我放置断点时，在一行中发现了问题：SearchView searchView =（SearchView）searchItem.getActionView（）-在onCreateOptionsMenu方法中。 为什么会这样？ （适配器在片段中创建）
在xml菜单中，我更改为
app:showAsAction="ifRoom|collapseActionView"
app:actionViewClass="android.support.v7.widget.SearchView"/>
@SuppressLint("ValidFragment")
public class AvailableDrivesFragment extends Fragment {
public RecyclerView drivesRecyclerView;
public LinearLayout details;
public List<Drive> drives = new ArrayList<>();
public TextView textDetails;
public Button buttonChoose;
IDataBase fb = FactoryDataBase.getDataBase();
private DrivesRecycleViewAdapter adapter;
private Menu menu;
Driver driver;
@SuppressLint("ValidFragment")
AvailableDrivesFragment(Driver e) {
this.driver = e;
}
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_available_drives, container, false);
textDetails = v.findViewById(R.id.text_details);
details = v.findViewById(R.id.linear_details);
details.setVisibility(View.GONE);
getActivity().setTitle("Available Drives");
drivesRecyclerView = v.findViewById(R.id.my_list);
drivesRecyclerView.setHasFixedSize(true);
drivesRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
adapter = new DrivesRecycleViewAdapter();
drives = fb.getAvailableDrives();
drivesRecyclerView.setAdapter(adapter);
setHasOptionsMenu(true);
return v;
}
@Override
public void onDestroy() {
Firebase_DBManager.stopNotifyToDriveList();
super.onDestroy();
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
super.onCreateOptionsMenu(menu, inflater);
menu.clear();
inflater.inflate(R.menu.search, menu);
MenuItem searchItem = menu.findItem(R.id.action_search);
SearchView searchView = (SearchView) searchItem.getActionView();//here stop working
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
return false;
}
@Override
public boolean onQueryTextChange(String newText) {
try {
adapter.getFilter().filter(newText);
}
catch (Exception r) {
r.printStackTrace();
}
return false;
}
});
}
public class DrivesRecycleViewAdapter extends RecyclerView.Adapter<DrivesRecycleViewAdapter.DriveViewHolder> implements Filterable
{
public List<Drive> drivefull;
public DrivesRecycleViewAdapter() {
this.drivefull = new ArrayList<>(drives);
;
}
@Override
public DriveViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(getActivity()).inflate(R.layout.item_drive, parent, false);
return new DriveViewHolder(v);
}
@Override
public void onBindViewHolder(@NonNull DriveViewHolder holder, int position) {
Drive drive = drives.get(position);
holder.nameTextView.setText(drive.getName());
holder.nameTextView.setTextSize(20);
holder.phoneTextView.setText(drive.getStartAddress());
holder.phoneTextView.setTextSize(16);
}
@Override
public int getItemCount() {
return drives.size();
}
@Override
public Filter getFilter() {
return filter;
}
public Filter filter = new Filter() {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
List<Drive> filteredList = new ArrayList<>();//new list that contained only filtered items
if (constraint == null || constraint.length() == 0)//we what to show all the results becuse we don't what filtering
{
filteredList.addAll(drivefull);
} else { //we what to filter the list
String filterPattern = constraint.toString().toLowerCase().trim(); // sting that takes the input
for (Drive item : drivefull) {
if (item.getName().toLowerCase().contains((filterPattern))) {
filteredList.add(item);
}
}
}
FilterResults results = new FilterResults();
results.values = filteredList;
return results;
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
drives.clear();
drives.addAll((List) results.values);
notifyDataSetChanged();
}
};
class DriveViewHolder extends RecyclerView.ViewHolder {
TextView phoneTextView;
TextView nameTextView;
public DriveViewHolder(final View itemView) {
super(itemView);
phoneTextView = itemView.findViewById(R.id.phone_item_drive);
nameTextView = itemView.findViewById(R.id.name_item_drive);
itemView.setOnCreateContextMenuListener(new View.OnCreateContextMenuListener() {
@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
menu.setHeaderTitle("Select Action");
MenuItem detailm = menu.add(Menu.NONE, 1, 1, "view details");
detailm.setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
@Override
public boolean onMenuItemClick(MenuItem item) {
Drive drive = drives.get(getAdapterPosition());
textDetails.setText(drive.toString());
details.setVisibility(View.VISIBLE);
return true;
}
});
MenuItem addDrive = menu.add(Menu.NONE, 1, 1, "take drive");
addDrive.setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
@Override
public boolean onMenuItemClick(MenuItem item) {
final Drive drive = drives.get(getAdapterPosition());
fb.changeStatus(drive.getId(), driver, DriveStatus.TREATMENT, new IDataBase.Action() {
@Override
public void onSuccess() {
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setMessage("The drive is in your care!")
.setCancelable(false)
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
String mail = drive.getEmail();
String[] mails = mail.split(",");
Intent in = new Intent(Intent.ACTION_SEND);
in.putExtra(Intent.EXTRA_EMAIL, mails);
in.putExtra(Intent.EXTRA_SUBJECT, "get taxi");
in.putExtra(Intent.EXTRA_TEXT, "taxi will coming to you in few minutes");
in.setType("message/rfc822");
startActivity(Intent.createChooser(in, "choose email"));
}
});
AlertDialog alert = builder.create();
alert.show();
drives.remove(getAdapterPosition());
drivesRecyclerView.getAdapter().notifyDataSetChanged();
}
@Override
public void onFailure(Exception exception) {
Toast.makeText(getActivity(), "הלקיחה נכשלה", Toast.LENGTH_LONG).show();
}
@Override
public void onProgress(String status, double percent) {
;
}
});
return true;
}
});
}
});
}
}
}
}