[英]Getting wrong position on RecyclerView
I am trying to get the position of the item in a recycler view in order to pass it down to other activities, but after actually managing to get the item id, I found out that I'm getting a -1, therefore not getting a correct id there.我试图在回收站视图中获取项目的 position 以便将其传递给其他活动,但在实际设法获取项目 ID 后,我发现我得到了 -1,因此没有得到那里有正确的身份证。 What could be causing this?这可能是什么原因造成的?
The activity:活动:
package com.gmproxy.pastilarma;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import androidx.lifecycle.ViewModelProvider;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.SearchView;
import android.widget.Toast;
import androidx.recyclerview.*;
import com.gmproxy.Adapters.PathologyListAdapter;
import com.gmproxy.Adapters.PathologyViewHolder;
import com.gmproxy.DAO.PathologyDAO;
import com.gmproxy.Entities.Pathology;
import com.gmproxy.Util.PathologyViewModel;
public class PathologiesSearchScreen extends AppCompatActivity {
private PathologyViewModel viewModel;
SearchView searchView;
RecyclerView recyclerView;
private PathologyDAO pathDao;
private Pathology pathology;
private PathologyViewHolder holder;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_pathology_search_list);
searchView = findViewById(R.id.SearchView);
recyclerView = findViewById(R.id.recyclerview);
final PathologyListAdapter adapter = new PathologyListAdapter(new PathologyListAdapter.UserDiff());
recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
viewModel = new ViewModelProvider(this).get(PathologyViewModel.class);
viewModel.pathologies.observe(this, adapter::submitList);
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
viewModel.setFilter(searchView.getQuery().toString());
return false;
}
@Override
public boolean onQueryTextChange(String newText) {
long start;
start = System.currentTimeMillis();
if ((newText.length() > 3) && (System.currentTimeMillis() - start > 500)) {
viewModel.setFilter(searchView.getQuery().toString());
}
return false;
}
});
recyclerView.addOnItemTouchListener(new RecyclerView.OnItemTouchListener() {
@Override
public boolean onInterceptTouchEvent(@NonNull @org.jetbrains.annotations.NotNull RecyclerView rv, @NonNull @org.jetbrains.annotations.NotNull MotionEvent e) {
pathology = getSelectedPathology(findViewById(R.id.recyclerview));
Log.println(Log.INFO, "PathologyTest", pathology.toString());
final CharSequence[] options = {"Si", "No"};
AlertDialog.Builder builder = new AlertDialog.Builder(PathologiesSearchScreen.this);
builder.setTitle("¿Añadir la patología " + pathology.getPathologyName() + "?");
builder.setItems(options, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int item) {
if (options[item].equals("Si")) {
Toast.makeText(PathologiesSearchScreen.this, "Has añadido la patología " + pathology.getPathologyName() + ".", Toast.LENGTH_SHORT).show();
Intent mainAct = new Intent(PathologiesSearchScreen.this, UserAddScreen.class);
mainAct.putExtra("path", pathology);
} else if (options[item].equals("No")) {
dialog.dismiss();
}
}
});
builder.show();
return true;
}
@Override
public void onTouchEvent(@NonNull @org.jetbrains.annotations.NotNull RecyclerView rv, @NonNull @org.jetbrains.annotations.NotNull MotionEvent e) {
}
@Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
}
});
}
public Pathology getSelectedPathology(View v){
holder = new PathologyViewHolder(v);
long idlongo = recyclerView.getAdapter().getItemId(holder.getAdapterPosition());
Log.println(Log.INFO, "PathologyTest", String.valueOf(idlongo));
int id = (int) idlongo;
Pathology path = pathDao.findObjectbyId(id);
return path;
}
}
The view holder:视图持有者:
package com.gmproxy.Adapters;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.TextView;
import android.widget.Toast;
import androidx.recyclerview.widget.RecyclerView;
import com.gmproxy.DAO.PathologyDAO;
import com.gmproxy.Entities.Pathology;
import com.gmproxy.pastilarma.PathologiesSearchScreen;
import com.gmproxy.pastilarma.R;
import java.nio.file.Path;
public class PathologyViewHolder extends RecyclerView.ViewHolder {
public final TextView objItemView;
public PathologyViewHolder(View itemView) {
super(itemView);
objItemView = itemView.findViewById(R.id.textView);
}
public void bind(String text) {
objItemView.setText(text);
}
static PathologyViewHolder create(ViewGroup parent) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.pathologies_item, parent, false);
return new PathologyViewHolder(view);
}
}
The list adapter:列表适配器:
package com.gmproxy.Adapters;
import android.content.DialogInterface;
import android.content.Intent;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AlertDialog;
import androidx.recyclerview.widget.DiffUtil;
import androidx.recyclerview.widget.ListAdapter;
import com.gmproxy.Entities.Pathology;
import com.gmproxy.pastilarma.PathologiesSearchScreen;
import com.gmproxy.pastilarma.UserAddScreen;
public class PathologyListAdapter extends ListAdapter<Pathology, PathologyViewHolder> {
public PathologyListAdapter(@NonNull DiffUtil.ItemCallback<Pathology> diffCallback) {
super(diffCallback);
}
@Override
public PathologyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
return PathologyViewHolder.create(parent);
}
@Override
public void onBindViewHolder(PathologyViewHolder holder, int position) {
Pathology current = getItem(position);
holder.bind(current.getPathologyName());
}
public static class UserDiff extends DiffUtil.ItemCallback<Pathology> {
@Override
public boolean areItemsTheSame(@NonNull Pathology oldItem, @NonNull Pathology newItem) {
return oldItem == newItem;
}
@Override
public boolean areContentsTheSame(@NonNull Pathology oldItem, @NonNull Pathology newItem) {
return oldItem.getPathologyName().equals(newItem.getPathologyName());
}
}
}
The entity DAO:实体 DAO:
package com.gmproxy.DAO;
import androidx.lifecycle.LiveData;
import androidx.room.*;
import com.gmproxy.Entities.Pathology;
import com.gmproxy.Entities.User;
import java.util.List;
@Dao
public interface PathologyDAO {
@Query("SELECT * FROM condiciones")
LiveData<List<Pathology>> getAllObjects();
//This will come in handy for getting all those pathologies, will need to get them on a for loop since I'm not completely sure
//that the query will handle int[]
@Query("SELECT id_condiciones FROM condiciones WHERE id_condiciones LIKE :id_condiciones")
int getPathologiesForUser(int id_condiciones);
@Query("SELECT nombreCondicion FROM condiciones WHERE nombreCondicion LIKE :pathologyName")
String getPathologiesForName(String pathologyName);
@Query("SELECT * FROM condiciones WHERE nombreCondicion LIKE :pathologyName")
Pathology getPathologiesCompleteForName(String pathologyName);
@Query("SELECT * FROM condiciones WHERE id_condiciones = :id")
Pathology findObjectbyId(int id);
@Query("SELECT * FROM condiciones WHERE nombreCondicion LIKE '%' || :filter || '%'")
LiveData<List<Pathology>> filterText(String filter);
@Insert(onConflict = OnConflictStrategy.REPLACE)
void insertAllObjects(List<Pathology> listObjects);
@Insert(onConflict = OnConflictStrategy.REPLACE)
void insertObject(Pathology object);
@Update
void updateObject(Pathology object);
@Delete
void delete(Pathology obj);
}
The entity repository:实体存储库:
package com.gmproxy.DAO;
import android.app.Application;
import android.os.AsyncTask;
import androidx.lifecycle.LiveData;
import com.gmproxy.Entities.Pathology;
import com.gmproxy.Entities.User;
import java.util.List;
import java.util.concurrent.ExecutionException;
public class PathologyRepository {
private PathologyDAO concerningDao;
private LiveData<List<Pathology>> pathologyList;
public PathologyRepository(Application application) {
DatabaseHelper db = DatabaseHelper.getDatabase(application);
concerningDao = db.pathologyDao();
pathologyList = concerningDao.getAllObjects();
}
public LiveData<List<Pathology>> getAllObjects() {
return concerningDao.getAllObjects();
}
void insertAllObjects(List<Pathology> objectsList) {
DatabaseHelper.databaseWriteExecutor.execute(() ->{
concerningDao.insertAllObjects(objectsList);
});
}
public void insertObject(Pathology obj){
DatabaseHelper.databaseWriteExecutor.execute(() ->{
concerningDao.insertObject(obj);
});
}
public void deleteObject(Pathology obj) {
concerningDao.delete(obj);
}
public LiveData<List<Pathology>> filter(String input){
try{
return new FilterNoteAsyncTask(concerningDao).execute(input).get();
} catch (ExecutionException | InterruptedException e) {
e.printStackTrace();
}
return null;
}
private static class FilterNoteAsyncTask extends AsyncTask<String, Void, LiveData<List<Pathology>>> {
private PathologyDAO pathologyDAO;
private FilterNoteAsyncTask(PathologyDAO pathologyDAO) {
this.pathologyDAO = pathologyDAO;
}
@Override
protected LiveData<List<Pathology>> doInBackground(String... strings) {
return pathologyDAO.filterText(strings[0]);
}
}
}
Move your PathologyListAdapter to global, and get adapter position using adapter object instead of getting adapter from recyclerview.将您的 PathologyListAdapter 移动到全局,并使用适配器 object 获取适配器 position,而不是从 recyclerview 获取适配器。
public Pathology getSelectedPathology(){ long idlongo = adapter.getAdapterPosition();公共病理学 getSelectedPathology(){ long idlongo = adapter.getAdapterPosition(); Log.println(Log.INFO, "PathologyTest", String.valueOf(idlongo)); Log.println(Log.INFO, "PathologyTest", String.valueOf(idlongo)); int id = (int) idlongo; int id = (int) idlongo; Pathology path = pathDao.findObjectbyId(id);病理路径 = pathDao.findObjectbyId(id); return path;返回路径; } }
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