Implement AddTodoActivity for Creating New Todo Items

.gitignore

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+# Android Studio
+*.iml
+.gradle/
+build/
+.idea/
+local.properties
+
+# Gradle files
+*.gradle
+**/build/
+
+# Compiled class files
+*.class
+
+# Log files
+*.log
+
+# Virtual machine crash logs
+hs_err_pid*
+
+# Mac system files
+.DS_Store
+
+# Sensitive or local configuration
+*.env
+
+# External libraries
+app/libs/
+
+# Test results
+test-results/
+reports/

app/src/main/java/com/example/todoapp/data/TodoItem.kt

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+package com.example.todoapp.data
+
+data class TodoItem(
+    val id: Long = 0, // Default 0 for new items
+    val title: String,
+    val description: String = "",
+    val isCompleted: Boolean = false
+) {
+    // Validation method
+    fun validate(): Boolean {
+        return title.isNotBlank()
+    }
+}

app/src/main/java/com/example/todoapp/ui/AddTodoActivity.kt

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+package com.example.todoapp.ui
+
+import android.os.Bundle
+import android.widget.Button
+import android.widget.Toast
+import androidx.appcompat.app.AppCompatActivity
+import com.google.android.material.textfield.TextInputEditText
+import com.example.todoapp.R
+import com.example.todoapp.data.TodoItem
+
+class AddTodoActivity : AppCompatActivity() {
+    private lateinit var titleEditText: TextInputEditText
+    private lateinit var descriptionEditText: TextInputEditText
+    private lateinit var saveButton: Button
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_add_todo)
+
+        // Initialize views
+        titleEditText = findViewById(R.id.titleEditText)
+        descriptionEditText = findViewById(R.id.descriptionEditText)
+        saveButton = findViewById(R.id.saveButton)
+
+        // Set up save button click listener
+        saveButton.setOnClickListener {
+            saveTodoItem()
+        }
+    }
+
+    private fun saveTodoItem() {
+        val title = titleEditText.text.toString().trim()
+        val description = descriptionEditText.text.toString().trim()
+
+        // Basic validation
+        if (title.isEmpty()) {
+            titleEditText.error = "Title cannot be empty"
+            return
+        }
+
+        // Create TodoItem (assuming TodoItem class exists)
+        val todoItem = TodoItem(
+            title = title,
+            description = description,
+            isCompleted = false
+        )
+
+        // TODO: Save to repository or database
+        Toast.makeText(this, "Todo saved!", Toast.LENGTH_SHORT).show()
+        finish() // Close the activity after saving
+    }
+}

app/src/main/res/layout/activity_add_todo.xml

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+<?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"
+    android:padding="16dp">
+
+    <com.google.android.material.textfield.TextInputLayout
+        android:id="@+id/titleInputLayout"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:hint="Todo Title">
+
+        <com.google.android.material.textfield.TextInputEditText
+            android:id="@+id/titleEditText"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:inputType="text" />
+    </com.google.android.material.textfield.TextInputLayout>
+
+    <com.google.android.material.textfield.TextInputLayout
+        android:id="@+id/descriptionInputLayout"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:hint="Todo Description"
+        android:layout_marginTop="16dp">
+
+        <com.google.android.material.textfield.TextInputEditText
+            android:id="@+id/descriptionEditText"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:inputType="textMultiLine"
+            android:minLines="3" />
+    </com.google.android.material.textfield.TextInputLayout>
+
+    <Button
+        android:id="@+id/saveButton"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="16dp"
+        android:text="Save Todo" />
+</LinearLayout>

app/src/test/java/com/example/todoapp/data/TodoItemTest.kt

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+package com.example.todoapp.data
+
+import org.junit.Assert.*
+import org.junit.Test
+
+class TodoItemTest {
+    @Test
+    fun `todo item creation with valid data`() {
+        val todoItem = TodoItem(
+            title = "Test Todo",
+            description = "Test Description"
+        )
+
+        assertEquals("Test Todo", todoItem.title)
+        assertEquals("Test Description", todoItem.description)
+        assertFalse(todoItem.isCompleted)
+    }
+
+    @Test
+    fun `todo item validation should pass with non-empty title`() {
+        val todoItem = TodoItem(title = "Valid Title")
+        assertTrue(todoItem.validate())
+    }
+
+    @Test
+    fun `todo item validation should fail with empty title`() {
+        val todoItem = TodoItem(title = "")
+        assertFalse(todoItem.validate())
+    }
+
+    @Test
+    fun `todo item can have optional description`() {
+        val todoItem = TodoItem(title = "Test", description = "")
+        assertEquals("", todoItem.description)
+        assertTrue(todoItem.validate())
+    }
+}