首頁猿問列表視圖僅顯示數(shù)組列表的第一個(gè)結(jié)果

列表視圖僅顯示數(shù)組列表的第一個(gè)結(jié)果

Java

函數(shù)式編程 2023-06-08 17:40:31

我有下面的代碼顯示數(shù)組列表的結(jié)果，但是，它只顯示測試結(jié)果，我將相同的結(jié)果附加到文本視圖進(jìn)行測試，發(fā)現(xiàn)我從查詢方法得到的結(jié)果確實(shí)包含多個(gè)他們出現(xiàn)在文本視圖中，但列表視圖只顯示第一個(gè)。請?jiān)谙旅嬲业酱a以及所附圖片。<?xml version="1.0" encoding="utf-8"?><androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".search.searchActivity"> <EditText android:id="@+id/userInputtxt2" android:layout_width="match_parent" android:layout_height="30dp" android:layout_marginStart="8dp" android:paddingTop="50dp" android:textColor="@color/Black" android:textSize="18sp" /> <EditText android:id="@+id/userInputtxt" android:layout_width="match_parent" android:layout_height="30dp" android:layout_marginStart="8dp" android:paddingTop="50dp" android:textColor="@color/Black" android:textSize="18sp" /> <Button android:id="@+id/findBtn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="320dp" android:layout_marginEnd="3dp" android:text="find" android:textSize="10sp" /> <ListView android:id="@+id/listview4" android:layout_width="398dp" android:layout_height="wrap_content" android:layout_marginStart="8dp" android:layout_marginTop="55dp" android:layout_marginEnd="8dp" android:layout_marginBottom="8dp"> </ListView> <TextView android:id="@+id/resultTxt" android:layout_width="match_parent" android:layout_height="203dp" android:layout_marginTop="450dp" android:background="@color/transparentGrey" android:text="TextView" /></androidx.coordinatorlayout.widget.CoordinatorLayout>

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2 回答

翻過高山走不出你

TA貢獻(xiàn)1875條經(jīng)驗(yàn) 獲得超3個(gè)贊

if (match != null) {

ArrayList<String> namesList = new ArrayList<>();

resultTxt.setText( matcheddata );

// namesList.clear(); // You don't need to clear it as you just created it above

namesList.add(matcheddata);

ArrayAdapter<String> adapter = new ArrayAdapter<>( getApplicationContext(), android.R.layout.simple_selectable_list_item, namesList );

listView.setAdapter(adapter);

}

嗨 Amer Anajjem，您可以嘗試在創(chuàng)建適配器之前準(zhǔn)備 namesList 并使用最新的 namesList 來創(chuàng)建適配器。

編輯：

我發(fā)現(xiàn)問題是：matcheddata是一個(gè)字符串。當(dāng)您致電時(shí)namesList.add(matcheddata);，您僅將 1 項(xiàng)添加到列表中。結(jié)果，您在列表視圖中只有 1 個(gè)項(xiàng)目。為了證明這一點(diǎn)，您可以嘗試以下操作：

if (match != null) {

ArrayList<String> namesList = new ArrayList<>();

resultTxt.setText( matcheddata );

namesList.clear();

namesList.add(matcheddata);

ArrayAdapter<String> adapter = new ArrayAdapter<>( getApplicationContext(), android.R.layout.simple_selectable_list_item, namesList );

listView.setAdapter(adapter);

}

您應(yīng)該在列表視圖中看到 2 個(gè)重復(fù)的項(xiàng)目。

編輯 2：

你可以試試這個(gè)，但我沒有測試過。

package com.example.boc.search;

import androidx.annotation.NonNull;

import androidx.recyclerview.widget.RecyclerView;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.LinearLayout;

import android.widget.ListView;

import android.widget.TextView;

import com.example.boc.Interface.IMainActivity;

import com.example.boc.R;

import com.example.boc.main.phone_nombers_Activity;

import com.example.boc.models.Note;

import com.example.boc.models.Search;

import com.google.android.gms.tasks.OnCompleteListener;

import android.widget.ArrayAdapter;

import com.google.android.gms.tasks.Task;

import com.google.firebase.firestore.CollectionReference;

import com.google.firebase.firestore.DocumentReference;

import com.google.firebase.firestore.DocumentSnapshot;

import com.google.firebase.firestore.FirebaseFirestore;

import com.google.firebase.firestore.Query;

import com.google.firebase.firestore.QueryDocumentSnapshot;

import com.google.firebase.firestore.QuerySnapshot;

import java.util.ArrayList;

public class searchActivity extends phone_nombers_Activity implements

View.OnClickListener,

IMainActivity

{

private DocumentSnapshot documentSnapshot;

ListView listView;

public TextView resultTxt , userinput ;

private ArrayList<Search> mSearch = new ArrayList<>();

public FirebaseFirestore db = FirebaseFirestore.getInstance();

public Note note ;

public LinearLayout layout ;

private ArrayList<Note> mNotes = new ArrayList<>();

private DocumentReference noteRef = db.collection("notes").document();

private CollectionReference notesCollectionRef = db.collection("notes");

private RecyclerView mRecyclerView;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate( savedInstanceState );

setContentView( R.layout.activity_search );

final ListView listView = findViewById( R.id.listview4 );

final EditText userinput = findViewById( R.id.userInputtxt );

final Button findbutton = findViewById( R.id.findBtn );

final TextView resultTxt = findViewById( R.id.resultTxt );

mRecyclerView = findViewById(R.id.recycler_view);

FirebaseFirestore db = FirebaseFirestore.getInstance();

CollectionReference notesCollectionRef = db

.collection("notes");

Query notesQuery = null;

if(documentSnapshot != null){

notesQuery = notesCollectionRef;

}

else{

notesQuery = notesCollectionRef

.orderBy("timestamp", Query.Direction.ASCENDING);

}

notesQuery.get().addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {

@Override

public void onComplete(@NonNull Task<QuerySnapshot> task) {

if(task.isSuccessful()){

String data = "";

for(final QueryDocumentSnapshot document: task.getResult()){

Note note = document.toObject(Note.class);

mNotes.add(note);

if( userinput !=null ) {

findbutton.setOnClickListener( new View.OnClickListener() {

@Override

public void onClick(View v) {

final String userinputString = userinput.getText().toString();

ArrayList<String> namesList = new ArrayList<>();

for (Note note : mNotes) {

if (note.getTitle().contains(userinputString)) {

String matchedtitle = note.getTitle();

String matchedcontent = note.getContent();

String matcheddata += "????:" + matchedcontent + "\n?????:" + matchedtitle + "\n\n";

namesList.add(matcheddata);

}

ArrayAdapter<String> adapter = new ArrayAdapter<>( getApplicationContext(), android.R.layout.simple_selectable_list_item, namesList );

listView.setAdapter(adapter);

}

} );

}

else {

userinput.setError( "??? ????? ?????" );

}

});

}

@Override

public void onStart () {

super.onStart();

}

反對回復(fù) 2023-06-08

揚(yáng)帆大魚

TA貢獻(xiàn)1799條經(jīng)驗(yàn) 獲得超9個(gè)贊

我認(rèn)為這是適配器通知問題。

您正在向適配器提供 0 大小列表，并立即通知適配器。
我認(rèn)為您應(yīng)該在添加到列表后通知適配器。或者您可以在調(diào)用適配器類之前將數(shù)據(jù)添加到列表中。

例子

notesQuery.get().addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {

@Override

public void onComplete(@NonNull Task<QuerySnapshot> task) {

if(task.isSuccessful()){

String data = "";

for(final QueryDocumentSnapshot document: task.getResult()){

Note note = document.toObject(Note.class);

mNotes.add(note);

if( userinput !=null ) {

findbutton.setOnClickListener( new View.OnClickListener() {

@Override

public void onClick(View v) {

final String userinputString = userinput.getText().toString();

Note match = null;

String matcheddata ="";

for (Note note : mNotes) {

if (note.getTitle().contains(userinputString)) {

match = note;

String matchedtitle = match.getTitle();

String matchedcontent = match.getContent();

matcheddata += "????:" + matchedcontent + "\n?????:" + matchedtitle + "\n\n";

}

if (match != null) {

ArrayList<String> namesList = new ArrayList<>();

resultTxt.setText( matcheddata );

namesList.clear();

namesList.add(matcheddata);

ArrayAdapter<String>adapter = new ArrayAdapter<>( getApplicationContext(), android.R.layout.simple_selectable_list_item, namesList );

listView.setAdapter(adapter);

}

} );

}

else {

userinput.setError( "??? ????? ?????" );

}

});

只需更改上面的功能并嘗試。

反對回復(fù) 2023-06-08

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列表視圖僅顯示數(shù)組列表的第一個(gè)結(jié)果

列表視圖僅顯示數(shù)組列表的第一個(gè)結(jié)果

2 回答

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