我有搜索视图，可在回收视图中搜索来自firestore的数据。 在youtube视频教程之后，我的搜索栏没有显示与用户输入匹配的数据。 当我在搜索栏中写东西时，它不会搜索任何东西，就像它只是一个文本视图一样。 请找到以下代码：
//我的搜索行为//
package com.example.boc.Pdf;
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import android.util.Log;
import android.widget.SearchView;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.example.boc.ImageView.MyPdfAdapter;
import com.example.boc.R;
import com.example.boc.models.DownModel;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.firestore.DocumentSnapshot;
import com.google.firebase.firestore.FirebaseFirestore;
import com.google.firebase.firestore.QuerySnapshot;
import java.util.ArrayList;
import java.util.Objects;
public class pdfDownloader extends AppCompatActivity {
FirebaseFirestore db;
FirebaseAuth mAuth;
FirebaseAuth.AuthStateListener mAuthListner;
FirebaseUser mUser;
RecyclerView mRecyclerView;
SearchView searchView ;
ArrayList<DownModel> downModelArrayList = new ArrayList<>();
MyPdfAdapter myAdapter;
public static final String TAG="LOGIN";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
searchView = findViewById( R.id.searchView );
setContentView( R.layout.activity_pdf_downloader);
mAuth = FirebaseAuth.getInstance();
mUser = FirebaseAuth.getInstance().getCurrentUser();
mAuthListner = new FirebaseAuth.AuthStateListener() {
@Override
public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
if (mUser != null) {
dataFromFirebase();
}
else
{
Log.d(TAG,"AuthStateChanged:Logout");
}
}
};
setUpRV();
setUpFB();
dataFromFirebase();
}
// allowing users to see the links ////
protected void onStart() {
super.onStart();
if (mUser != null) {
dataFromFirebase();
}
else
{
Log.d(TAG,"AuthStateChanged:Logout");
}
if (searchView !=null ){
searchView.setOnQueryTextListener( new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
return false;
}
@Override
public boolean onQueryTextChange(String newText) {
search(newText);
return true;
}
} );
}
}
private void search (String str){
ArrayList<DownModel> mylist = new ArrayList<>( );
for (DownModel object : downModelArrayList){
if (object.get_name().toLowerCase().contains( str.toLowerCase() )) {
mylist.add( object );
}
}
MyPdfAdapter myPdfAdapter = new MyPdfAdapter(pdfDownloader.this ,mylist );
mRecyclerView .setAdapter( myPdfAdapter );
}
private void dataFromFirebase() {
if(downModelArrayList.size()>0)
downModelArrayList.clear();
db.collection("files")
.get()
.addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
@Override
public void onComplete(@NonNull Task<QuerySnapshot> task) {
for(DocumentSnapshot documentSnapshot: Objects.requireNonNull( task.getResult() )) {
DownModel downModel= new DownModel(documentSnapshot.getString("name"),
documentSnapshot.getString("link"));
downModelArrayList.add(downModel);
}
myAdapter= new MyPdfAdapter(pdfDownloader.this,downModelArrayList);
mRecyclerView.setAdapter(myAdapter);
}
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
Toast.makeText(pdfDownloader.this, "Error ;-.-;", Toast.LENGTH_SHORT).show();
}
})
;
}
private void setUpFB(){
db=FirebaseFirestore.getInstance();
}
private void setUpRV(){
mRecyclerView= findViewById(R.id.recycle);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
}
}
//我的适配器//
package com.example.boc.ImageView;
import android.app.DownloadManager;
import android.content.Context;
import android.net.Uri;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.example.boc.Pdf.pdfDownloader;
import com.example.boc.R;
import com.example.boc.models.DownModel;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.firestore.FirebaseFirestore;
import com.google.firebase.storage.FirebaseStorage;
import java.util.ArrayList;
import java.util.List;
import static android.os.Environment.DIRECTORY_DOWNLOADS;
import static com.example.boc.Pdf.pdfDownloader.TAG;
public class MyPdfAdapter extends RecyclerView.Adapter<MyViewHolder> {
com.example.boc.Pdf.pdfDownloader pdfDownloader;
MyViewHolder mViewholder;
ArrayList<DownModel> downModels;
FirebaseFirestore db;
List<DownModel> itemList;
public MyPdfAdapter(pdfDownloader pdfDownloader , ArrayList<DownModel> downModels) {
this.pdfDownloader = pdfDownloader;
this.downModels = downModels;
}
@NonNull
@Override
public MyViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
LayoutInflater layoutInflater = LayoutInflater.from(pdfDownloader.getBaseContext());
View view = layoutInflater.inflate( R.layout.elements, null, false);
return new MyViewHolder(view);
}
public void updateList (ArrayList<DownModel> downmodel2) {
if (downModels != null && downModels.size() > 0) {
downModels.clear();
downModels.addAll( downmodel2 );
this.notifyDataSetChanged();
}
}
@Override
public void onBindViewHolder(@NonNull final MyViewHolder myViewHolder, final int i) {
myViewHolder.mName.setText(downModels.get(i).getName());
myViewHolder.deletePdfBtn.setOnClickListener( new View.OnClickListener() {
@Override
public void onClick(View v) {
Context context =myViewHolder.mName.getContext();
if (context !=null){
FirebaseFirestore db = FirebaseFirestore.getInstance();
FirebaseStorage firebaseStorage = FirebaseStorage.getInstance();
String filenamed = (String) myViewHolder.mName.getText();
String url = downModels.get( i ).getLink() ;
firebaseStorage.getReferenceFromUrl( url ).delete()
.addOnSuccessListener( new OnSuccessListener<Void>() {
@Override
public void onSuccess(Void aVoid) {
Log.d( TAG, "DocumentSnapshot successfully written!" );
}
} );
db.collection( "files" ).document(filenamed).delete()
.addOnSuccessListener( new OnSuccessListener<Void>() {
@Override
public void onSuccess(Void aVoid) {
Log.d( TAG, "DocumentSnapshot successfully written!" );
downModels.remove(i);
notifyDataSetChanged();
}
} )
.addOnFailureListener( new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
Log.w( TAG, "Error writing document", e );
}
} );
}
else {
return ;
}
};
});
myViewHolder.mDownload.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
downloadFile(myViewHolder.mName.getContext(),downModels.get(i).getName(),".pdf",DIRECTORY_DOWNLOADS,downModels.get(i).getLink());
}
});
}
public void downloadFile(Context context, String fileName, String fileExtension, String destinationDirectory, String url) {
DownloadManager downloadmanager = (DownloadManager) context.
getSystemService(Context.DOWNLOAD_SERVICE);
Uri uri = Uri.parse(url);
DownloadManager.Request request = new DownloadManager.Request(uri);
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
request.setDestinationInExternalFilesDir(context, destinationDirectory, fileName + fileExtension);
downloadmanager.enqueue(request);
}
@Override
public int getItemCount() {
return downModels.size();
}}
//我的下载模型//
package com.example.boc.models;
public class DownModel {
String Name,Link;
private String name,link;
public String getName() {
return Name;
}
public void setName(String name) {
this.Name = name;
}
public String getLink() {
return Link;
}
public void setLink(String link) { this.Link = link; }
public String get_name() {
return name;
}
public DownModel(String Name, String Link){
this.Link=Link;
this.Name=Name;
this.name = name;
}
}
看起来我在加载包括搜索输入在内的新列表时遇到了问题，任何人都知道要遵循的教程或是否有办法找到问题的根源？