[Android][JAVA] ListView로 구현하는 TodoList

안녕하세요 이번시간에는 리스트뷰를 사용해서 작성한 TodoList를 소개하겠습니다.

 

 

 

MainActivity.java

package com.example.todolist;

import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;

import androidx.appcompat.app.AppCompatActivity;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    private EditText editTextTask;
    private Button buttonAdd;
    private ListView listViewTasks;
    private ArrayList<String> taskList;
    private ArrayAdapter<String> adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // UI 초기화
        editTextTask = findViewById(R.id.editTextTask);
        buttonAdd = findViewById(R.id.buttonAdd);
        listViewTasks = findViewById(R.id.listViewTasks);
        // todo list 를 위한 리스트뷰 셋팅
        taskList = new ArrayList<>();
        adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, taskList);
        listViewTasks.setAdapter(adapter);

        buttonAdd.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String task = editTextTask.getText().toString().trim();
                if (!task.isEmpty()) {
                    taskList.add(task);
                    adapter.notifyDataSetChanged();
                    editTextTask.setText("");
                }
            }
        });
    }
}

 

 

activity_main.xml

 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="16dp"
    tools:context=".MainActivity">

    <EditText
        android:id="@+id/editTextTask"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Enter a task" />

    <Button
        android:id="@+id/buttonAdd"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Add Task" />

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

</LinearLayout>