Add Hilt and inject new MailboxNotificationManager

build.gradle

 buildscript {
     ext.kotlin_version = "1.5.21"
+    ext.hilt_version = "2.37"
     repositories {
         google()
         mavenCentral()
@@ -7,6 +8,7 @@ buildscript {
     dependencies {
         classpath 'com.android.tools.build:gradle:4.2.2'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+        classpath "com.google.dagger:hilt-android-gradle-plugin:$hilt_version"
     }
 }
 

mailbox/build.gradle

@@ -2,6 +2,7 @@ plugins {
     id 'com.android.application'
     id 'kotlin-android'
     id 'kotlin-kapt'
+    id 'dagger.hilt.android.plugin'
 }
 
 android {
@@ -35,11 +36,22 @@ android {
 
 dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
-    implementation 'com.google.dagger:dagger:2.37'
-    kapt 'com.google.dagger:dagger-compiler:2.37'
-    implementation 'androidx.appcompat:appcompat:1.0.0'
-    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
-    testImplementation 'junit:junit:4.13.1'
-    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
-    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0'
+    implementation 'androidx.appcompat:appcompat:1.3.0'
+    implementation "androidx.activity:activity-ktx:1.2.3"
+    implementation "androidx.fragment:fragment-ktx:1.3.5"
+
+    def lifecycle_version = "2.3.1"
+    implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:$lifecycle_version"
+    implementation "androidx.lifecycle:lifecycle-livedata-ktx:$lifecycle_version"
+    implementation "androidx.lifecycle:lifecycle-common-java8:$lifecycle_version"
+    implementation "androidx.lifecycle:lifecycle-viewmodel-savedstate:$lifecycle_version"
+
+    implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
+    implementation "com.google.dagger:hilt-android:$hilt_version"
+    kapt "com.google.dagger:hilt-compiler:$hilt_version"
+
+    testImplementation 'junit:junit:4.13.2'
+
+    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
 }

mailbox/src/main/java/org/briarproject/mailbox/MailboxApplication.kt

 package org.briarproject.mailbox
 
 import android.app.Application
+import dagger.hilt.android.HiltAndroidApp
 
+@HiltAndroidApp
 class MailboxApplication : Application() {
 
-    val appComponent = DaggerApplicationComponent.create()
-
     override fun onCreate() {
         super.onCreate()
-        MailboxService.startService(this, "Waiting for messages")
+        MailboxService.startService(this)
     }
 
 }

mailbox/src/main/java/org/briarproject/mailbox/MailboxNotificationManager.kt

+package org.briarproject.mailbox
+
+import android.app.Notification
+import android.app.NotificationChannel
+import android.app.NotificationManager
+import android.app.NotificationManager.IMPORTANCE_LOW
+import android.app.PendingIntent
+import android.content.Context
+import android.content.Intent
+import android.os.Build
+import androidx.annotation.RequiresApi
+import androidx.core.app.NotificationCompat
+import androidx.core.app.NotificationCompat.PRIORITY_MIN
+import androidx.core.content.ContextCompat.getSystemService
+import dagger.hilt.android.qualifiers.ApplicationContext
+import javax.inject.Inject
+
+class MailboxNotificationManager @Inject constructor(
+    @ApplicationContext private val ctx: Context,
+) {
+
+    companion object {
+        private const val CHANNEL_ID = "Briar Mailbox Service"
+
+        const val NOTIFICATION_MAIN_ID = 1
+    }
+
+    private val nm = getSystemService(ctx, NotificationManager::class.java)!!
+
+    init {
+        if (Build.VERSION.SDK_INT >= 26) createNotificationChannels()
+    }
+
+    @RequiresApi(26)
+    private fun createNotificationChannels() {
+        val channels = listOf(
+            NotificationChannel(
+                CHANNEL_ID,
+                ctx.getString(R.string.notification_channel_name),
+                IMPORTANCE_LOW,
+            )
+        )
+        nm.createNotificationChannels(channels)
+    }
+
+    val serviceNotification: Notification
+        get() {
+            val notificationIntent = Intent(ctx, MainActivity::class.java)
+            val pendingIntent = PendingIntent.getActivity(
+                ctx, 0, notificationIntent, 0
+            )
+            return NotificationCompat.Builder(ctx, CHANNEL_ID)
+                .setContentTitle(ctx.getString(R.string.notification_mailbox_running))
+                .setContentText("Waiting for messages...")
+                .setSmallIcon(R.drawable.ic_launcher_foreground)
+                .setContentIntent(pendingIntent)
+                .setPriority(PRIORITY_MIN)
+                .build()
+        }
+
+}

mailbox/src/main/java/org/briarproject/mailbox/MailboxService.kt

 package org.briarproject.mailbox
 
-import android.app.NotificationChannel
-import android.app.NotificationManager
-import android.app.PendingIntent
 import android.app.Service
 import android.content.Context
 import android.content.Intent
-import android.os.Build.VERSION
-import android.os.Build.VERSION.SDK_INT
-import android.os.Build.VERSION_CODES
 import android.os.IBinder
-import androidx.core.app.NotificationCompat
 import androidx.core.content.ContextCompat
+import dagger.hilt.android.AndroidEntryPoint
+import org.briarproject.mailbox.MailboxNotificationManager.Companion.NOTIFICATION_MAIN_ID
+import javax.inject.Inject
 
+@AndroidEntryPoint
 class MailboxService : Service() {
 
-
     companion object {
-
-        private const val CHANNEL_ID = "Briar Mailbox Service"
-        private const val ARG_MESSAGE = "message"
-
-        private const val NOTIFICATION_MAIN_ID = 1
-
-        fun startService(context: Context, message: String) {
+        fun startService(context: Context) {
             val startIntent = Intent(context, MailboxService::class.java)
-            startIntent.putExtra(ARG_MESSAGE, message)
             ContextCompat.startForegroundService(context, startIntent)
         }
 
@@ -35,22 +24,11 @@ class MailboxService : Service() {
         }
     }
 
-    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
-        val input = intent?.getStringExtra(ARG_MESSAGE)
-        createNotificationChannel()
-        val notificationIntent = Intent(this, MainActivity::class.java)
-        val pendingIntent = PendingIntent.getActivity(
-            this, 0, notificationIntent, 0
-        )
-
-        val notification = NotificationCompat.Builder(this, CHANNEL_ID)
-            .setContentTitle(getString(R.string.notification_mailbox_running))
-            .setContentText(input)
-            .setSmallIcon(R.drawable.ic_launcher_foreground)
-            .setContentIntent(pendingIntent)
-            .build()
+    @Inject
+    lateinit var notificationManager: MailboxNotificationManager
 
-        startForeground(NOTIFICATION_MAIN_ID, notification)
+    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
+        startForeground(NOTIFICATION_MAIN_ID, notificationManager.serviceNotification)
         return START_NOT_STICKY
     }
 
@@ -58,15 +36,4 @@ class MailboxService : Service() {
         return null
     }
 
-    private fun createNotificationChannel() {
-        if (SDK_INT >= 26) {
-            val serviceChannel = NotificationChannel(
-                CHANNEL_ID, getString(R.string.notification_channel_name),
-                NotificationManager.IMPORTANCE_DEFAULT
-            )
-
-            val manager = getSystemService(NotificationManager::class.java)
-            manager!!.createNotificationChannel(serviceChannel)
-        }
-    }
 }

mailbox/src/main/java/org/briarproject/mailbox/MailboxViewModel.kt

 package org.briarproject.mailbox
 
+import android.app.Application
+import androidx.lifecycle.AndroidViewModel
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.SavedStateHandle
+import dagger.hilt.android.lifecycle.HiltViewModel
 import javax.inject.Inject
 
-class MailboxViewModel @Inject constructor() {
+@HiltViewModel
+class MailboxViewModel @Inject constructor(
+    app: Application,
+    handle: SavedStateHandle,
+) : AndroidViewModel(app) {
 
-    val text = "Hello Mailbox"
+    private val _text = handle.getLiveData("text", "Hello Mailbox")
+    val text: LiveData<String> = _text
+
+    fun updateText(str: String) {
+        _text.value = str
+    }
 
 }

mailbox/src/main/java/org/briarproject/mailbox/MainActivity.kt

 package org.briarproject.mailbox
 
 import android.os.Bundle
+import android.widget.Button
 import android.widget.TextView
+import androidx.activity.viewModels
 import androidx.appcompat.app.AppCompatActivity
-import javax.inject.Inject
+import dagger.hilt.android.AndroidEntryPoint
 
+@AndroidEntryPoint
 class MainActivity : AppCompatActivity() {
 
-    lateinit var applicationComponent: ApplicationComponent
-
-    @Inject
-    lateinit var mailboxViewModel: MailboxViewModel
+    private val viewModel: MailboxViewModel by viewModels()
 
     override fun onCreate(savedInstanceState: Bundle?) {
-        (applicationContext as MailboxApplication).appComponent.inject(this)
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
 
         val textView = findViewById<TextView>(R.id.text)
-        textView.text = mailboxViewModel.text
+        val button = findViewById<Button>(R.id.button)
+
+        button.setOnClickListener {
+            viewModel.updateText("Tested")
+        }
+
+        viewModel.text.observe(this, { text ->
+            textView.text = text
+        })
     }
 }

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

@@ -16,4 +16,14 @@
         app:layout_constraintRight_toRightOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
 
+    <Button
+        android:id="@+id/button"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="16dp"
+        android:text="Test"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/text" />
+
 </androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file