Migrate to Android 29

Re-Added Cache clear to prevent deleting downloading images

app/src/main/java/xyz/quaver/pupil/ui/Pupil.kt

@@ -0,0 +1,46 @@
+package xyz.quaver.pupil.ui
+
+import android.app.Notification
+import android.app.NotificationChannel
+import android.app.NotificationManager
+import android.content.Context
+import android.os.Build
+import androidx.core.content.ContextCompat
+import androidx.multidex.MultiDexApplication
+import androidx.preference.PreferenceManager
+import xyz.quaver.pupil.R
+import xyz.quaver.pupil.util.Histories
+import java.io.File
+
+class Pupil : MultiDexApplication() {
+
+    lateinit var histories: Histories
+    lateinit var downloads: Histories
+    lateinit var favorites: Histories
+
+    override fun onCreate() {
+        val preference = PreferenceManager.getDefaultSharedPreferences(this)
+
+        histories = Histories(File(ContextCompat.getDataDir(this), "histories.json"))
+        downloads = Histories(File(ContextCompat.getDataDir(this), "downloads.json"))
+        favorites = Histories(File(ContextCompat.getDataDir(this), "favorites.json"))
+
+        super.onCreate()
+
+        if (!preference.getBoolean("channel_created", false)) {
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+                val manager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
+                val channel = NotificationChannel("download", getString(R.string.channel_download), NotificationManager.IMPORTANCE_LOW).apply {
+                    description = getString(R.string.channel_download_description)
+                    enableLights(false)
+                    enableVibration(false)
+                    lockscreenVisibility = Notification.VISIBILITY_SECRET
+                }
+                manager.createNotificationChannel(channel)
+            }
+
+            preference.edit().putBoolean("channel_created", true).apply()
+        }
+    }
+
+}