Added Lab 8

Labs/Lab8_Networking/.gitignore

+.idea/
+.gradle/
+build/
+*.log
+local.properties

Labs/Lab8_Networking/app/.gitignore

+/build
\ No newline at end of file

Labs/Lab8_Networking/app/build.gradle

+plugins {
+    id 'com.android.application'
+    id 'org.jetbrains.kotlin.android'
+    id 'androidx.navigation.safeargs'
+}
+
+android {
+    compileSdkVersion build_versions.compile_sdk
+    defaultConfig {
+        minSdkVersion build_versions.min_sdk
+        targetSdkVersion build_versions.target_sdk
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+
+    buildFeatures {
+        viewBinding true
+    }
+}
+
+dependencies {
+    implementation deps.core_ktx
+    implementation deps.activity.activity_ktx
+    implementation deps.fragment.fragment_ktx
+    implementation deps.app_compat
+    implementation deps.material
+    implementation deps.constraint_layout
+    implementation deps.lifecycle.livedata_ktx
+    implementation deps.lifecycle.viewmodel_ktx
+    implementation deps.ktor.client_core
+    implementation deps.ktor.client_cio
+    implementation deps.gson
+}
\ No newline at end of file

Labs/Lab8_Networking/app/proguard-rules.pro

+# 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
\ No newline at end of file

Labs/Lab8_Networking/app/src/main/AndroidManifest.xml

+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="course.labs.networking">
+
+    <uses-permission android:name="android.permission.INTERNET" />
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.App">
+        <activity
+            android:name="course.labs.networking.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>
\ No newline at end of file

Labs/Lab8_Networking/app/src/main/java/course/labs/networking/MainActivity.kt

+package course.labs.networking
+
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+
+class MainActivity : AppCompatActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.main_activity)
+
+        if (savedInstanceState == null) {
+            // TODO
+            // Initialize MainFragment
+        }
+    }
+}
\ No newline at end of file

Labs/Lab8_Networking/app/src/main/java/course/labs/networking/MainFragment.kt

+package course.labs.networking
+
+import android.graphics.drawable.BitmapDrawable
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import androidx.fragment.app.viewModels
+import course.labs.networking.MainViewModel.Status.*
+import course.labs.networking.databinding.MainFragmentBinding
+
+class MainFragment : Fragment() {
+
+    // Binding to XML layout
+    private lateinit var binding: MainFragmentBinding
+
+    // Defining the viewModel
+    private val viewModel by viewModels<MainViewModel>()
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View {
+        // Inflating the fragment binding and returning the binding root
+        binding = MainFragmentBinding.inflate(inflater, container, false)
+        return binding.root
+    }
+
+    /**
+     * Called by the framework once the view has been created.
+     * This is the appropriate place to update the view or add
+     * listeners before the view is actually displayed.
+     **/
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+
+        // Register an observer to the viewModel's LiveData and respond to status updates.
+        // 1. When the GET request is in progress, display the appropriate message.
+        // 2. When the bitmap is downloaded, display the QR code.
+        // 3. If an error is obtained, display the error message.
+        // 4. After steps 2 and 3, re-enable the button that downloads the QR code.
+        viewModel.statusLiveData.observe(viewLifecycleOwner) { status ->
+            when (status) {
+                is Progress -> {
+                    // TODO
+                    // Display a message saying that the GET request/download is in progress.
+                }
+
+                is Result -> {
+                    // Display the image and update the text view.
+                    binding.info.text = null
+                    binding.info.setCompoundDrawablesWithIntrinsicBounds(null,null,null,
+                        BitmapDrawable(resources,status.image)
+                    )
+
+                    // TODO
+                    // Re-enable button.
+                }
+
+                is Error -> {
+                    // TODO
+                    // Display the error resource string and
+                    // exception message in text view.
+
+                    // TODO
+                    // Re-enable button.
+                }
+            }
+        }
+
+
+        /**
+         * Set the button OnClickListener to call the network request
+         * defined in the viewModel
+         * **/
+        binding.button.setOnClickListener {
+            // TODO
+            // Disable button.
+
+            // TODO
+            // Clear output text from the previous request.
+
+            // TODO
+            // Use viewModel to send asynchronous network request.
+        }
+    }
+}
\ No newline at end of file

Labs/Lab8_Networking/app/src/main/java/course/labs/networking/MainViewModel.kt

+package course.labs.networking
+
+import android.graphics.Bitmap
+import android.graphics.BitmapFactory
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import io.ktor.client.*
+import io.ktor.client.request.*
+import kotlinx.coroutines.*
+
+class MainViewModel : ViewModel() {
+
+    // Defining a pair of LiveData and MutableLiveData variables of type Status
+    // The Status variable will be updated to display the downloaded bitmap, the status of the network request and
+    // error messages if any
+    private val _statusLiveData = MutableLiveData<Status>()
+    val statusLiveData: LiveData<Status>
+        get() = _statusLiveData
+
+
+    /** Keep track of coroutine so that duplicate requests are ignored. */
+    private var job: Job? = null
+
+    /**
+     * Defining a sealed class to store the status of the network request,
+     * the downloaded bitmap and the error message, if any
+     */
+    sealed class Status {
+        data class Progress(val progress: Int) : Status()
+        data class Result(val image: Bitmap) : Status()
+        data class Error(val errorResId: Int, val e: Exception) : Status()
+    }
+
+    /**
+     * sendNetworkRequest() is a non-blocking function called by the UI (Fragment) when the
+     * user clicks the send button. This function starts a coroutine
+     * that sends a network request and then posts downloaded bitmap
+     * on the LiveData feed that can be observed by the calling
+     * Fragment.
+     */
+    fun sendNetworkRequest() {
+        // TODO:
+        // Ignore button click if a request is still active.
+
+        // TODO:
+        // Update the Progress field of the Status LiveData feed and say that the GET request is being performed
+
+        // Launch a new coroutine to run network request in the background.
+        job = viewModelScope.launch {
+            try {
+                // TODO:
+                // Run the suspending network request to download the bitmap and store it in a variable
+
+                // TODO:
+                // Post the downloaded bitmap to the Result field of the Status LiveData Feed
+
+            } catch (e: Exception) {
+                // TODO:
+                // Something went wrong ... post an error message to the Error field of the Status LiveData feed.
+
+            }
+        }
+    }
+
+    /**
+     * makeNetworkCall() is a suspending helper function that performs the network request
+     * specified by the passed [url] and returns a Bitmap.
+     */
+    private suspend fun makeNetworkCall(url: String): Bitmap =
+        withContext(Dispatchers.IO) {
+
+            // For testing purposes, simulate network delay
+            delay(2000)
+
+            // TODO:
+            // Construct a new Ktor HttpClient to perform the GET
+            // request and then return the resulting Bitmap
+            // Use the decodeStream function from BitmapFactory to decode the HttpClient output into a Bitmap
+            // Resize the Bitmap to dimension (SIZE, SIZE) using the createScaledBitmap function
+
+            // Replace the line below with the code to download the bitmap
+            // The line below has only been included so that the initial app compiles without errors
+            Bitmap.createBitmap(SIZE, SIZE, Bitmap.Config.RGB_565)
+        }
+
+    /**
+     * Constants
+     * Use these constants in the makeNetworkCall() function
+     * Download a square image of dimension (SIZE, SIZE) specified in URL below
+     */
+    companion object {
+        private const val URL =
+            "https://image-charts.com/chart?chs=150x150&cht=qr&chl=https://www.cs.umd.edu/class/fall2022/cmsc436/&choe=UTF-8"
+        private const val SIZE = 450
+    }
+}
\ No newline at end of file

Labs/Lab8_Networking/app/src/main/res/drawable/background_selector.xml

+<?xml version="1.0" encoding="utf-8"?>
+<ripple xmlns:android="http://schemas.android.com/apk/res/android"
+    android:color="?attr/rippleColor">
+    <item>
+        <selector>
+            <item android:state_checked="true">
+                <color android:color="?attr/colorControlHighlight" />
+            </item>
+        </selector>
+    </item>
+</ripple>
\ No newline at end of file

Labs/Lab8_Networking/app/src/main/res/drawable/ic_launcher_background.xml

+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path
+        android:fillColor="#3DDC84"
+        android:pathData="M0,0h108v108h-108z" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M9,0L9,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,0L19,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,0L29,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,0L39,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,0L49,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,0L59,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,0L69,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,0L79,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M89,0L89,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M99,0L99,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,9L108,9"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,19L108,19"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,29L108,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,39L108,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,49L108,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,59L108,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,69L108,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,79L108,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,89L108,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,99L108,99"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,29L89,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,39L89,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,49L89,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,59L89,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,69L89,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,79L89,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,19L29,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,19L39,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,19L49,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,19L59,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,19L69,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,19L79,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+</vector>

Labs/Lab8_Networking/app/src/main/res/drawable/ic_launcher_foreground.xml

+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path android:pathData="M31,63.928c0,0 6.4,-11 12.1,-13.1c7.2,-2.6 26,-1.4 26,-1.4l38.1,38.1L107,108.928l-32,-1L31,63.928z">
+        <aapt:attr name="android:fillColor">
+            <gradient
+                android:endX="85.84757"
+                android:endY="92.4963"
+                android:startX="42.9492"
+                android:startY="49.59793"
+                android:type="linear">
+                <item
+                    android:color="#44000000"
+                    android:offset="0.0" />
+                <item
+                    android:color="#00000000"
+                    android:offset="1.0" />
+            </gradient>
+        </aapt:attr>
+    </path>
+    <path
+        android:fillColor="#FFFFFF"
+        android:fillType="nonZero"
+        android:pathData="M65.3,45.828l3.8,-6.6c0.2,-0.4 0.1,-0.9 -0.3,-1.1c-0.4,-0.2 -0.9,-0.1 -1.1,0.3l-3.9,6.7c-6.3,-2.8 -13.4,-2.8 -19.7,0l-3.9,-6.7c-0.2,-0.4 -0.7,-0.5 -1.1,-0.3C38.8,38.328 38.7,38.828 38.9,39.228l3.8,6.6C36.2,49.428 31.7,56.028 31,63.928h46C76.3,56.028 71.8,49.428 65.3,45.828zM43.4,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2c-0.3,-0.7 -0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C45.3,56.528 44.5,57.328 43.4,57.328L43.4,57.328zM64.6,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2s-0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C66.5,56.528 65.6,57.328 64.6,57.328L64.6,57.328z"
+        android:strokeWidth="1"
+        android:strokeColor="#00000000" />
+</vector>
\ No newline at end of file

Labs/Lab8_Networking/app/src/main/res/layout/main_activity.xml

+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/container"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent" />
\ No newline at end of file

Labs/Lab8_Networking/app/src/main/res/layout/main_fragment.xml

+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:layout_margin="@dimen/activity_margin">
+
+    <Button
+        android:id="@+id/button"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="24dp"
+        android:layout_marginBottom="24dp"
+        android:text="@string/get_qr_string"
+        android:textColor="#212121"
+        app:layout_constraintBottom_toTopOf="@+id/info"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <TextView
+        android:id="@+id/info"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/click_send_to_issue_a_network_request"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/button"
+        android:gravity="start"
+        android:textColor="@color/secondary_text"
+        android:contentDescription="QR Code">
+    </TextView>
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file

Labs/Lab8_Networking/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>
\ No newline at end of file

Labs/Lab8_Networking/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml

+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>
\ No newline at end of file