Implement Navigation Logic for Todo Item Creation

.gitignore

@@ -0,0 +1,34 @@
+# Android Studio
+*.iml
+.gradle
+/local.properties
+/.idea/
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+
+# Kotlin and Java
+*.class
+*.log
+*.ctxt
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# Dependency directories
+node_modules/
+kotlin-js-store/
+
+# Gradle
+.gradle/
+build/
+
+# Miscellaneous
+.env
+__pycache__/

app/build.gradle

@@ -0,0 +1,26 @@
+plugins {
+    id 'com.android.application'
+    id 'kotlin-android'
+    id 'kotlin-kapt'
+}
+
+dependencies {
+    // Kotlin standard library
+    implementation "org.jetbrains.kotlin:kotlin-stdlib:1.8.0"
+
+    // AndroidX
+    implementation 'androidx.core:core-ktx:1.10.1'
+    implementation 'androidx.appcompat:appcompat:1.6.1'
+    implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.6.1'
+
+    // Room Database
+    implementation 'androidx.room:room-runtime:2.5.2'
+    implementation 'androidx.room:room-ktx:2.5.2'
+    kapt 'androidx.room:room-compiler:2.5.2'
+
+    // Test dependencies
+    testImplementation 'junit:junit:4.13.2'
+    testImplementation 'org.robolectric:robolectric:4.10.3'
+    testImplementation 'androidx.test:core:1.5.0'
+    testImplementation 'androidx.test.ext:junit:1.1.5'
+}

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

@@ -0,0 +1,71 @@
+package com.example.todoapp.ui
+
+import android.content.Intent
+import android.os.Bundle
+import android.widget.Button
+import android.widget.EditText
+import androidx.appcompat.app.AppCompatActivity
+import androidx.lifecycle.lifecycleScope
+import com.example.todoapp.R
+import com.example.todoapp.data.TodoItem
+import com.example.todoapp.data.TodoRepository
+import kotlinx.coroutines.launch
+
+class CreateTodoItemActivity : AppCompatActivity() {
+
+    private lateinit var titleEditText: EditText
+    private lateinit var descriptionEditText: EditText
+    private lateinit var saveButton: Button
+    private lateinit var todoRepository: TodoRepository
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_create_todo_item)
+
+        // Initialize views
+        titleEditText = findViewById(R.id.edit_text_todo_title)
+        descriptionEditText = findViewById(R.id.edit_text_todo_description)
+        saveButton = findViewById(R.id.button_save_todo)
+
+        // Initialize repository (assumes dependency injection or manual initialization)
+        todoRepository = TodoRepository(application)
+
+        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 todo item
+        val todoItem = TodoItem(
+            title = title,
+            description = description,
+            isCompleted = false
+        )
+
+        // Save todo item using coroutines
+        lifecycleScope.launch {
+            todoRepository.insert(todoItem)
+            // Navigate back to main activity
+            navigateToMainActivity()
+        }
+    }
+
+    private fun navigateToMainActivity() {
+        val intent = Intent(this, MainActivity::class.java)
+        // Clear the back stack so user can't navigate back to create todo screen
+        intent.flags = Intent.FLAG_ACTIVITY_CLEAR_TOP or Intent.FLAG_ACTIVITY_NEW_TASK
+        startActivity(intent)
+        // Finish current activity
+        finish()
+    }
+}

app/src/test/java/com/example/todoapp/CreateTodoItemActivityTest.kt

@@ -0,0 +1,44 @@
+package com.example.todoapp
+
+import android.content.Intent
+import androidx.test.core.app.ActivityScenario
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.example.todoapp.ui.CreateTodoItemActivity
+import com.example.todoapp.ui.MainActivity
+import org.junit.Assert.assertEquals
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.robolectric.Robolectric
+import org.robolectric.Shadows.shadowOf
+
+@RunWith(AndroidJUnit4::class)
+class CreateTodoItemActivityTest {
+
+    @Test
+    fun `test navigation to main activity after saving todo item`() {
+        // Create an activity scenario
+        val scenario = ActivityScenario.launch(CreateTodoItemActivity::class.java)
+
+        scenario.onActivity { activity ->
+            // Mock saving a todo item by directly calling private method
+            val method = activity.javaClass.getDeclaredMethod("navigateToMainActivity")
+            method.isAccessible = true
+            method.invoke(activity)
+
+            // Get the next started intent
+            val shadowActivity = Robolectric.shadowOf(activity)
+            val startedIntent = shadowActivity.nextStartedActivity
+
+            // Verify intent navigation
+            assertEquals(MainActivity::class.java.name, 
+                         startedIntent.component?.className)
+
+            // Verify intent flags
+            assertEquals(
+                Intent.FLAG_ACTIVITY_CLEAR_TOP or Intent.FLAG_ACTIVITY_NEW_TASK, 
+                startedIntent.flags
+            )
+        }
+    }
+}