[英]How do I hide the ListView until a string is entered in the SearchView
我试图隐藏我的 ListView,直到在 SearchView 中输入一个字符串。
我对 Java 很陌生,但我尝试了一个文本监听器,甚至使用点击方法妥协,但我似乎无法让它工作。
package com.example.searchfunction;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ListView;
import android.widget.SearchView;
import java.util.ArrayList;
import android.os.Bundle;
public class MainActivity extends AppCompatActivity implements SearchView.OnQueryTextListener {
// Declare Variables
ListView list;
ListViewAdapter adapter;
SearchView editsearch;
String[] animalNameList;
ArrayList<AnimalNames> arraylist = new ArrayList<AnimalNames>();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Generate sample data
animalNameList = new String[]{"Lion", "Tiger", "Dog",
"Cat", "Tortoise", "Rat", "Elephant", "Fox",
"Cow","Donkey","Monkey"};
// Locate the ListView in listview_main.xml
list = findViewById(R.id.listview);
for (int i = 0; i < animalNameList.length; i++) {
AnimalNames animalNames = new AnimalNames(animalNameList[i]);
// Binds all strings into an array
arraylist.add(animalNames);
}
// Pass results to ListViewAdapter Class
adapter = new ListViewAdapter(this, arraylist);
// Binds the Adapter to the ListView
list.setAdapter(adapter);
// Locate the EditText in listview_main.xml
editsearch = (SearchView) findViewById(R.id.search);
editsearch.setOnQueryTextListener(this);
}
@Override
public boolean onQueryTextSubmit(String query) {
return false;
}
@Override
public boolean onQueryTextChange(String newText) {
String text = newText;
adapter.filter(text);
return false;
}
}
在它应该工作的方法中返回 true
@Override
public boolean onQueryTextChange(String newText) {
String text = newText;
adapter.filter(text);
if(TextUtils.isEmpty(text)){
list.setVisibility(View.GONE);
}
else {
list.setVisibility(View.VISIBLE);
}
return true;
}
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