Android Studio - ListView2

* 리스트뷰의 동적 추가/삭제

 

* activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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=".MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">
        <EditText
            android:id="@+id/edtItem"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"></EditText>
        <Button
            android:id="@+id/btnAdd"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="항목 추가"></Button>
        <ListView
            android:id="@+id/listView1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"></ListView>


    </LinearLayout>
</LinearLayout>

 

* MainActivity.java

package com.example.listview_1;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
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 MainActivity extends AppCompatActivity {

    EditText edtItem;
    Button btnAdd;
    ListView listView1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        listView1 = (ListView) findViewById(R.id.listView1);
        edtItem = (EditText) findViewById(R.id.edtItem);
        btnAdd = (Button) findViewById(R.id.btnAdd);

        final ArrayList<String> midList = new ArrayList<String>();
        final ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, midList);
        listView1.setAdapter(adapter);

        btnAdd.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                midList.add(edtItem.getText().toString());
                adapter.notifyDataSetChanged();
            }
        });

        listView1.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
            @Override
            public boolean onItemLongClick(AdapterView<?> adapterView, View view, int position, long id) {
                midList.remove(position);
                adapter.notifyDataSetChanged();
                return false;
            }
        });

    }
}

* 실행 화면