lab 2 city code

code/.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties

code/app/.gitignore

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+/build

code/app/build.gradle.kts

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+plugins {
+    alias(libs.plugins.android.application)
+}
+
+android {
+    namespace = "com.example.listycity"
+    compileSdk {
+        version = release(36)
+    }
+
+    defaultConfig {
+        applicationId = "com.example.listycity"
+        minSdk = 24
+        targetSdk = 36
+        versionCode = 1
+        versionName = "1.0"
+
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = false
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro"
+            )
+        }
+    }
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_11
+        targetCompatibility = JavaVersion.VERSION_11
+    }
+}
+
+dependencies {
+    implementation(libs.appcompat)
+    implementation(libs.material)
+    implementation(libs.activity)
+    implementation(libs.constraintlayout)
+    testImplementation(libs.junit)
+    androidTestImplementation(libs.ext.junit)
+    androidTestImplementation(libs.espresso.core)
+}

code/app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

code/app/src/androidTest/java/com/example/listycity/ExampleInstrumentedTest.java

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+package com.example.listycity;
+
+import android.content.Context;
+
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
+        assertEquals("com.example.listycity", appContext.getPackageName());
+    }
+}

code/app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <application
+        android:allowBackup="true"
+        android:dataExtractionRules="@xml/data_extraction_rules"
+        android:fullBackupContent="@xml/backup_rules"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.ListyCity">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

code/app/src/main/java/com/example/listycity/MainActivity.java

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+package com.example.listycity;
+
+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.activity.EdgeToEdge;
+import androidx.appcompat.app.AppCompatActivity;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import androidx.appcompat.widget.Toolbar;
+
+public class MainActivity extends AppCompatActivity {
+
+    ListView cityList;
+    ArrayAdapter<String> cityAdapter;
+    ArrayList<String> datalist;
+
+    Button addCityButton, deleteCityButton, confirmAddButton;
+    EditText cityInput;
+
+    boolean deleteMode = false; // STATE FLAG
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        EdgeToEdge.enable(this);
+        setContentView(R.layout.activity_main);
+        Toolbar toolbar = findViewById(R.id.top_bar);
+        setSupportActionBar(toolbar);
+
+
+        cityList = findViewById(R.id.city_list);
+        addCityButton = findViewById(R.id.add_city_button);
+        deleteCityButton = findViewById(R.id.delete_city_button);
+        confirmAddButton = findViewById(R.id.confirm_add_button);
+        cityInput = findViewById(R.id.city_input);
+
+        String[] cities = {
+                "Edmonton", "Vancouver", "Moscow", "Sydney",
+                "Berlin", "Vienna", "Tokyo", "Beijing",
+                "Osaka", "New Delhi"
+        };
+
+        datalist = new ArrayList<>(Arrays.asList(cities));
+
+        cityAdapter = new ArrayAdapter<>(
+                this,
+                R.layout.content,
+                datalist
+        );
+
+        cityList.setAdapter(cityAdapter);
+
+        // ADD CITY BUTTON
+        addCityButton.setOnClickListener(v -> {
+            deleteMode = false;
+            cityInput.setVisibility(View.VISIBLE);
+            confirmAddButton.setVisibility(View.VISIBLE);
+        });
+
+        // CONFIRM ADD
+        confirmAddButton.setOnClickListener(v -> {
+            String city = cityInput.getText().toString().trim();
+
+            if (!city.isEmpty()) {
+                datalist.add(city);
+                cityAdapter.notifyDataSetChanged();
+                cityInput.setText("");
+            }
+
+            cityInput.setVisibility(View.GONE);
+            confirmAddButton.setVisibility(View.GONE);
+        });
+
+        // DELETE MODE BUTTON
+        deleteCityButton.setOnClickListener(v -> {
+            deleteMode = true;
+        });
+
+        // LIST ITEM CLICK
+        cityList.setOnItemClickListener((parent, view, position, id) -> {
+            if (deleteMode) {
+                datalist.remove(position);
+                cityAdapter.notifyDataSetChanged();
+                deleteMode = false; // exit delete mode after one delete
+            }
+        });
+    }
+}