[Android] 안드로이드 스튜디오 ListView 만들기

xml파일

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>

<ListView
android:id="@+id/listView"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
/>

<Button
android:id="@+id/button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text = "Add"
android:textColor="#000000"
android:textSize="28dp"
android:gravity="center"
/>
<Button
android:id="@+id/button1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text = "Del"
android:textColor="#000000"
android:textSize="28dp"
android:gravity="center"
/>

</LinearLayout>

 

자바 파일

package com.example.listview;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

	private ArrayList<String> arrayList;
	private ListView listView;
	private ArrayAdapter<String> adapter;

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

		arrayList = new ArrayList<String>();

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

		adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, arrayList);

		listView.setAdapter(adapter);

		Button button = findViewById(R.id.button);
		Button button1 = findViewById(R.id.button1);
		button.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View v) {
				int number = arrayList.size() + 1;
				arrayList.add("test" + number);
				adapter.notifyDataSetChanged();
				if (number > 0)
					listView.setSelection(number - 1);
			}
		});
		button1.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View v) {
				int number = arrayList.size();
				arrayList.remove("test" + number);
				adapter.notifyDataSetChanged();
				if (number > 0)
					listView.setSelection(number);
			}
		});
	}
}

 

ADD부분을 누르게 되면 test가 생성

DEL 부분을 누르게 되면 맨마지막에 생성된 부분 삭제