Connection to API (#8)

app/build.gradle

@@ -1,6 +1,7 @@
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
+    id("org.jlleitschuh.gradle.ktlint") version "12.1.0"
 }
 
 android {
@@ -42,52 +43,31 @@ android {
 
 dependencies {
 
-    implementation 'androidx.core:core-ktx:1.7.0'
-    implementation 'androidx.appcompat:appcompat:1.6.1'
-    implementation 'com.google.android.material:material:1.11.0'
-    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
-    testImplementation 'junit:junit:4.13.2'
-    androidTestImplementation 'androidx.test.ext:junit:1.1.5'
-    androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
+    implementation("androidx.core:core-ktx:1.12.0")
+    implementation("androidx.lifecycle:lifecycle-runtime-ktx:2.7.0")
+    implementation("androidx.activity:activity-compose:1.8.2")
+    implementation(platform("androidx.compose:compose-bom:2024.03.00"))
+    implementation("androidx.compose.ui:ui")
+    implementation("androidx.compose.ui:ui-graphics")
+    implementation("androidx.compose.ui:ui-tooling-preview")
+    implementation("androidx.compose.material3:material3")
+    implementation("org.apache.commons:commons-lang3:3.14.0")
+    testImplementation("junit:junit:4.13.2")
+    androidTestImplementation("androidx.test.ext:junit:1.1.5")
+    androidTestImplementation("androidx.test.espresso:espresso-core:3.5.1")
+    androidTestImplementation(platform("androidx.compose:compose-bom:2024.03.00"))
+    androidTestImplementation("androidx.compose.ui:ui-test-junit4")
+    debugImplementation("androidx.compose.ui:ui-tooling")
+    debugImplementation("androidx.compose.ui:ui-test-manifest")
 
-    def composeBom = platform('androidx.compose:compose-bom:2024.03.00')
-    implementation composeBom
-    androidTestImplementation composeBom
-
-    // Choose one of the following:
-    // Material Design 3
-    implementation 'androidx.compose.material3:material3'
-    // or Material Design 2
-    implementation 'androidx.compose.material:material'
-    // or skip Material Design and build directly on top of foundational components
-    implementation 'androidx.compose.foundation:foundation'
-    // or only import the main APIs for the underlying toolkit systems,
-    // such as input and measurement/layout
-    implementation 'androidx.compose.ui:ui'
-
-    // Android Studio Preview support
-    implementation 'androidx.compose.ui:ui-tooling-preview'
-    debugImplementation 'androidx.compose.ui:ui-tooling'
-
-    // UI Tests
-    androidTestImplementation 'androidx.compose.ui:ui-test-junit4'
-    debugImplementation 'androidx.compose.ui:ui-test-manifest'
-
-    // Optional - Included automatically by material, only add when you need
-    // the icons but not the material library (e.g. when using Material3 or a
-    // custom design system based on Foundation)
-    implementation 'androidx.compose.material:material-icons-core'
-    // Optional - Add full set of material icons
-    implementation 'androidx.compose.material:material-icons-extended'
-    // Optional - Add window size utils
-    implementation 'androidx.compose.material3:material3-window-size-class'
+    // For the API call
+    implementation 'com.squareup.retrofit2:retrofit:2.9.0'
+    implementation 'com.squareup.retrofit2:converter-gson:2.9.0'
+
+}
 
-    // Optional - Integration with activities
-    implementation 'androidx.activity:activity-compose:1.8.2'
-    // Optional - Integration with ViewModels
-    implementation 'androidx.lifecycle:lifecycle-viewmodel-compose:2.6.1'
-    // Optional - Integration with LiveData
-    implementation 'androidx.compose.runtime:runtime-livedata'
-    // Optional - Integration with RxJava
-    implementation 'androidx.compose.runtime:runtime-rxjava2'
+ktlint {
+    dependencies {
+        ktlintRuleset("com.twitter.compose.rules:ktlint:0.0.26")
+    }
 }

app/src/androidTest/java/dk/scheduling/schedulingfrontend/ExampleInstrumentedTest.kt

@@ -3,7 +3,6 @@ package dk.scheduling.schedulingfrontend
 import androidx.test.platform.app.InstrumentationRegistry
 import androidx.test.ext.junit.runners.AndroidJUnit4
 
-import org.junit.Test
 import org.junit.runner.RunWith
 
 import org.junit.Assert.*
@@ -15,7 +14,7 @@ import org.junit.Assert.*
  */
 @RunWith(AndroidJUnit4::class)
 class ExampleInstrumentedTest {
-    @Test
+    @org.junit.jupiter.api.Test
     fun useAppContext() {
         // Context of the app under test.
         val appContext = InstrumentationRegistry.getInstrumentation().targetContext

app/src/main/AndroidManifest.xml

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools">
+    <uses-permission android:name="android.permission.INTERNET"/>
 
     <application
         android:allowBackup="true"
@@ -10,6 +11,7 @@
         android:label="@string/app_name"
         android:supportsRtl="true"
         android:theme="@style/Theme.SchedulingFrontend"
+        android:usesCleartextTraffic="true"
         tools:targetApi="31">
         <activity
             android:name=".MainActivity"

app/src/main/java/dk/scheduling/schedulingfrontend/API/ApiClient.kt

@@ -0,0 +1,53 @@
+package dk.scheduling.schedulingfrontend.API
+
+import com.google.gson.GsonBuilder
+import okhttp3.OkHttpClient
+import retrofit2.Retrofit
+import retrofit2.converter.gson.GsonConverterFactory
+import java.security.SecureRandom
+import java.security.cert.X509Certificate
+import javax.net.ssl.SSLContext
+import javax.net.ssl.TrustManager
+import javax.net.ssl.X509TrustManager
+
+object RetrofitClient {
+    /**
+     * The base URL of the API
+     * 10.0.2.2 is a special alias to your host loopback interface (127.0.0.1 on your development machine)
+     * 2222 is the port where the server is running
+     */
+    private const val BASE_URL = "http://10.0.2.2:2222/"
+    private val gson = GsonBuilder().setLenient().create()
+    private val okHttpClient: OkHttpClient by lazy {
+        val trustAllCertificates = arrayOf<TrustManager>(object : X509TrustManager {
+            override fun checkClientTrusted(chain: Array<out X509Certificate>?, authType: String?) {}
+            override fun checkServerTrusted(chain: Array<out X509Certificate>?, authType: String?) {}
+            override fun getAcceptedIssuers(): Array<X509Certificate> = arrayOf()
+        })
+
+        val sslContext = SSLContext.getInstance("SSL")
+        sslContext.init(null, trustAllCertificates, SecureRandom())
+
+        val sslSocketFactory = sslContext.socketFactory
+
+        OkHttpClient.Builder()
+            .sslSocketFactory(sslSocketFactory, trustAllCertificates[0] as X509TrustManager)
+            .hostnameVerifier { _, _ -> true } // Allow all hostnames
+            .build()
+    }
+    val retrofit: Retrofit by lazy {
+        Retrofit.Builder()
+            .baseUrl(BASE_URL)
+            .client(okHttpClient)
+            .addConverterFactory(GsonConverterFactory.create(gson))
+            .build()
+    }
+}
+
+
+
+object ApiClient {
+    val apiService: ApiService by lazy {
+        RetrofitClient.retrofit.create(ApiService::class.java)
+    }
+}

app/src/main/java/dk/scheduling/schedulingfrontend/API/ApiService.kt

@@ -0,0 +1,8 @@
+package dk.scheduling.schedulingfrontend.API
+import retrofit2.Call
+import retrofit2.http.GET
+
+interface ApiService {
+    @GET("test")
+    fun test() : Call<String>
+}

app/src/main/java/dk/scheduling/schedulingfrontend/MainActivity.kt

@@ -2,10 +2,38 @@ package dk.scheduling.schedulingfrontend
 
 import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
-
+import android.util.Log
+import android.util.Log.ERROR
+import android.widget.Button
+import dk.scheduling.schedulingfrontend.API.ApiClient
+import retrofit2.Call
+import retrofit2.Callback
+import retrofit2.Response
 class MainActivity : AppCompatActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+        val button = findViewById<Button>(R.id.button)
+        button.setOnClickListener {
+            val call = ApiClient.apiService.test()
+
+            call.enqueue(object : Callback<String>{
+                override fun onResponse(call: Call<String>, response: Response<String>) {
+                    if (response.isSuccessful) {
+                        //val post = response.body()
+                        println("we got a response")
+                        // Handle the retrieved post data
+                    } else {
+                        println("we did not get a successful response")
+                        // Handle error
+                    }
+                }
+
+                override fun onFailure(call: Call<String>, t: Throwable) {
+                    // Handle failure
+                    Log.e("error message", "could not get a response")
+                }
+            })
+        }
     }
 }

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

@@ -15,4 +15,16 @@
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
 
+    <Button
+        android:id="@+id/button"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Button"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.51"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.26999998" />
+
 </androidx.constraintlayout.widget.ConstraintLayout>

app/src/test/java/dk/scheduling/schedulingfrontend/ExampleUnitTest.kt

@@ -1,6 +1,6 @@
 package dk.scheduling.schedulingfrontend
 
-import org.junit.Test
+import org.junit.jupiter.api.Test
 
 import org.junit.Assert.*
 
@@ -10,7 +10,7 @@ import org.junit.Assert.*
  * See [testing documentation](http://d.android.com/tools/testing).
  */
 class ExampleUnitTest {
-    @Test
+    @org.junit.jupiter.api.Test
     fun addition_isCorrect() {
         assertEquals(4, 2 + 2)
     }

gradle.properties

@@ -23,5 +23,4 @@ kotlin.code.style=official
 android.nonTransitiveRClass=true
 # TODO: Fix this supression
 android.suppressUnsupportedCompileSdk=34
-android.defaults.buildfeatures.buildconfig=true
 android.nonFinalResIds=false