在fragment里面使用元件
常常在写程序时会遇到再fragment抓不到元件的事情
用这个方式就能解决
View view=inflater.inflate(R.layout.fragment_message, container, false);
message_listview=view.findViewById(R.id.messa_listview);
这样就可以了
完整程序码
package com.example.graduationtopic;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import java.util.ArrayList;
/**
*/
public class MessageFragment extends Fragment implements AdapterView.OnItemClickListener{
private ListView message_listview;
private String[] search=new String[]{};
private String[] test=new String[]{};
private String[] fruit_name=new String[]{"Apple","Banana","Orange","Grape","Strawberry"};
private String[] mdates=new String[]{"Apple","Banana","Orange","Grape","Strawberry"};
EditText editText;
ListAdapter listAdapter;
public MessageFragment() {
// Required empty public constructor
}
public void onATTach(Context context){
super.onAttach(context);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view=inflater.inflate(R.layout.fragment_message, container, false);
editText=view.findViewById(R.id.editText);
message_listview=view.findViewById(R.id.messa_listview);
search =mdates;
editText.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
search=test;
}
@Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
if (editText.length()==0){
search =mdates;}
}
@Override
public void afterTextChanged(Editable editable) {
for(int x =0; x < mdates.length;x++){
if (editText.getText().equals(mdates[x]))
mdates[x]=search[x];
adapter();
}
}
});
adapter();
return view;}
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
}
public void adapter() {
ArrayAdapter<String> ada =new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1,search);
message_listview.setAdapter(ada);
message_listview.setOnItemClickListener(this);
}
public static boolean isEmpty(@Nullable CharSequence str) {
return str == null || str.length() == 0;
}
}
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