periodic notification

app/build.gradle.kts

@@ -60,6 +60,7 @@ dependencies {
     implementation("androidx.compose.ui:ui-tooling-preview")
     implementation("androidx.compose.material3:material3")
     implementation("androidx.core:core-ktx:1.12.0")
+    implementation("androidx.work:work-runtime-ktx:2.8.1")
 
     val roomVersion = "2.6.0"
     implementation("androidx.room:room-runtime:$roomVersion")

app/src/main/AndroidManifest.xml

@@ -3,6 +3,7 @@
     xmlns:tools="http://schemas.android.com/tools">
 
     <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
 
     <application
         android:name=".MemoApplication"
@@ -18,7 +19,6 @@
         <activity
             android:name=".MainActivity"
             android:exported="true"
-            android:label="@string/app_name"
             android:theme="@style/Theme.MemorisationApplication">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />

app/src/main/java/fr/uparis/diamantkennel/memorisationapplication/MainActivity.kt

@@ -61,7 +61,7 @@ fun MainScreenMainActivity() {
 
 @Preview(showBackground = true)
 @Composable
-fun MainScreenActivityPreview() {
+fun MainScreenPreview() {
     MainScreen()
 }
 

app/src/main/java/fr/uparis/diamantkennel/memorisationapplication/MemoApplication.kt

@@ -1,8 +1,70 @@
 package fr.uparis.diamantkennel.memorisationapplication
 
 import android.app.Application
+import android.app.NotificationChannel
+import android.app.NotificationManager
+import android.content.Context
+import android.content.pm.PackageManager
+import android.os.Build
+import android.util.Log
+import androidx.work.PeriodicWorkRequest
+import androidx.work.WorkManager
 import fr.uparis.diamantkennel.memorisationapplication.data.QuestionsDB
+import java.util.Calendar
+import java.util.concurrent.TimeUnit
+
+const val CHANNEL_ID = "MY_CHANNEL_ID"
 
 class MemoApplication : Application() {
     val database: QuestionsDB by lazy { QuestionsDB.getDataBase(this) }
+
+    override fun onCreate() {
+        super.onCreate()
+        createChannel(this)
+
+        if (this.checkSelfPermission(android.Manifest.permission.POST_NOTIFICATIONS) == PackageManager.PERMISSION_GRANTED)
+            schedule()
+        else
+            Log.d("MemoApplication", "onCreate: no permission")
+    }
+
+    private fun createChannel(c: Context)
+    {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
+        {
+            val name = "MY_CHANNEL"
+            val descriptionText = "notification channel for Memorisation project"
+            val importance = NotificationManager.IMPORTANCE_DEFAULT
+            val channel = NotificationChannel(CHANNEL_ID, name, importance).apply {
+                description = descriptionText
+            }
+            val notificationManager = c.getSystemService(Context.NOTIFICATION_SERVICE)
+                    as NotificationManager
+            notificationManager.createNotificationChannel(channel)
+        }
+    }
+
+    private fun schedule()
+    {
+        val wm = WorkManager.getInstance(this)
+        wm.cancelAllWork()
+        wm.enqueue(request(10, 45))
+    }
+
+    private fun request(h: Int, m: Int): PeriodicWorkRequest
+    {
+        val now = Calendar.getInstance()
+        val target = Calendar.getInstance().apply {
+            set(Calendar.HOUR_OF_DAY, h)
+            set(Calendar.MINUTE, m)
+        }
+        if (target.before(now))
+            target.add(Calendar.DAY_OF_YEAR, 1)
+        val delta=target.timeInMillis - now.timeInMillis
+        val request = PeriodicWorkRequest.Builder(RappelWorker::class.java, 1, TimeUnit.DAYS)
+                .setInitialDelay(delta, TimeUnit.MILLISECONDS)
+                .build()
+        Log.d("Periodic", "request: $request")
+        return request
+    }
 }

app/src/main/java/fr/uparis/diamantkennel/memorisationapplication/RappelWorker.kt

@@ -0,0 +1,37 @@
+package fr.uparis.diamantkennel.memorisationapplication
+
+import android.app.NotificationManager
+import android.app.PendingIntent
+import android.content.Context
+import android.content.Intent
+import androidx.core.app.NotificationCompat
+import androidx.work.Worker
+import androidx.work.WorkerParameters
+
+
+class RappelWorker(private val context: Context, workerParams: WorkerParameters) :
+    Worker(context, workerParams) {
+    override fun doWork(): Result {
+        createNotification(context)
+        return Result.success()
+    }
+
+    private fun createNotification(context: Context)
+    {
+        val intent = Intent(context, MainActivity::class.java)
+        val pendingIntent = PendingIntent.getActivity(
+            context, 0, intent, PendingIntent.FLAG_IMMUTABLE
+        )
+
+        val builder = NotificationCompat.Builder(context, CHANNEL_ID)
+            .setSmallIcon(R.drawable.ic_launcher_foreground)
+            .setContentTitle("Rappel")
+            .setContentText("Il est temps de réviser !")
+            .setContentIntent(pendingIntent)
+            .setPriority(NotificationCompat.PRIORITY_DEFAULT)
+        val notification = builder.build()
+        val notificationManager = context.getSystemService(Context.NOTIFICATION_SERVICE)
+                as NotificationManager
+        notificationManager.notify(0, notification)
+    }
+}

app/src/main/java/fr/uparis/diamantkennel/memorisationapplication/SettingsScreen.kt

@@ -1,5 +1,8 @@
 package fr.uparis.diamantkennel.memorisationapplication
 
+import android.util.Log
+import androidx.activity.compose.rememberLauncherForActivityResult
+import androidx.activity.result.contract.ActivityResultContracts
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.PaddingValues
@@ -33,6 +36,12 @@ fun SettingsScreen(padding: PaddingValues, model: SettingsViewModel = viewModel(
     var deletionDBRequest by model.deletionDB
     var cleanStatRequest by model.deletionStat
 
+    val permissionLauncher = rememberLauncherForActivityResult(
+        contract = ActivityResultContracts.RequestPermission(),
+    ) {
+        Log.d("permissions", if(it) "granted" else "denied")
+    }
+
     if (deletionDBRequest) {
         DeletionDBDialog(model::deleteDb) { deletionDBRequest = false }
     }
@@ -70,6 +79,15 @@ fun SettingsScreen(padding: PaddingValues, model: SettingsViewModel = viewModel(
                 Text(text = context.getString(R.string.clean_stat_button))
             }
         }
+
+        Button(
+            enabled = model.isNotGranted(context),
+            onClick = {
+                model.requestNotificationPermission(permissionLauncher)
+            }
+        ) {
+            Text(text = context.getString(R.string.permission_button))
+        }
     }
 }
 

app/src/main/java/fr/uparis/diamantkennel/memorisationapplication/ui/SettingsViewModel.kt

@@ -1,6 +1,9 @@
 package fr.uparis.diamantkennel.memorisationapplication.ui
 
 import android.app.Application
+import android.content.Context
+import android.content.pm.PackageManager
+import androidx.activity.result.ActivityResultLauncher
 import androidx.compose.runtime.mutableStateOf
 import androidx.datastore.preferences.core.edit
 import androidx.datastore.preferences.core.intPreferencesKey
@@ -59,4 +62,14 @@ class SettingsViewModel(application: Application) : AndroidViewModel(application
         }
         return ((good.toFloat() / total.toFloat()) * 100).toInt()
     }
+
+    fun requestNotificationPermission(launcher: ActivityResultLauncher<String>)
+    {
+        launcher.launch(android.Manifest.permission.POST_NOTIFICATIONS)
+    }
+
+    fun isNotGranted(context: Context): Boolean
+    {
+        return context.checkSelfPermission(android.Manifest.permission.POST_NOTIFICATIONS) != PackageManager.PERMISSION_GRANTED
+    }
 }

app/src/main/res/values/strings.xml

@@ -50,4 +50,5 @@
     <string name="clean_stat_button">Réinitialiser stats</string>
     <string name="clean_stat">Réinitialiser les statistiques</string>
     <string name="clean_stat_desc">Voulez-vous réinitialiser les statistiques ?</string>
+    <string name="permission_button">Autoriser notification</string>
 </resources>