Capitulo 27 ➜ App Lista de Tareas - ToDoList

Versión Simple: Add y Del

Esta aplicación Android permite agregar tareas y eliminar dichas tares de forma sencilla.

<?xml version="1.0" encoding="utf-8"?>
<androidx.appcompat.widget.LinearLayoutCompat 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:id="@+id/main"
    android:layout_width="match_parent"
    android:orientation="vertical"
    android:layout_margin="50dp"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
    <TextView
        android:textAlignment="center"
        android:text="LISTA DE TAREAS | SIMPLE"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
    <LinearLayout
        android:padding="5dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <EditText
            android:id="@+id/tarea"
            android:layout_weight="3"
            android:layout_width="0dp"
            android:layout_height="wrap_content"/>
        <Button
            android:id="@+id/btn"
            android:layout_weight="1"
            android:layout_width="0dp"
            android:text="Add"
            android:layout_height="wrap_content"/>
    </LinearLayout>
    <ListView
        android:id="@+id/listView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
</androidx.appcompat.widget.LinearLayoutCompat>

Y el código Java es el siguiente:

package codea.app.todolist;

import android.os.Bundle;
import android.util.Log;
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 androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    private EditText texto;
    private Button btn;
    private ListView list;
    private ArrayList<String> items;
    private ArrayAdapter<String> itemsAdapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        EdgeToEdge.enable(this);
        setContentView(R.layout.activity_main);
        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> {
            Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
            return insets;
        });

        btn = findViewById(R.id.btn);
        list = findViewById(R.id.listView);
        items = new ArrayList<>();
        itemsAdapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1,items);
        list.setAdapter(itemsAdapter);
        list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                remove(position);
            }
        });

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                addItem(v);
            }
        });

    }
    private void addItem(View view){
        texto = findViewById(R.id.tarea);
        String item = texto.getText().toString();
        itemsAdapter.add(item);
        texto.setText("");
    }
    private  boolean remove(int position){
        Log.d("cliclk","r---"+position);
        items.remove(position);
        itemsAdapter.notifyDataSetChanged();
        return true;
    }
}

Versión Avanzada : Add, Edit, Del