Use DialogFragments everywhere

mobile/src/main/java/be/mygod/vpnhotspot/AlertDialogFragment.kt

@@ -0,0 +1,19 @@
+package be.mygod.vpnhotspot
+
+import android.content.DialogInterface
+import android.content.Intent
+import android.os.Bundle
+import androidx.appcompat.app.AlertDialog
+import androidx.fragment.app.DialogFragment
+
+abstract class AlertDialogFragment : DialogFragment(), DialogInterface.OnClickListener {
+    protected abstract fun AlertDialog.Builder.prepare(listener: DialogInterface.OnClickListener)
+    open val data: Intent? get() = null
+
+    override fun onCreateDialog(savedInstanceState: Bundle?): AlertDialog =
+            AlertDialog.Builder(requireContext()).also { it.prepare(this) }.create()
+
+    override fun onClick(dialog: DialogInterface?, which: Int) {
+        targetFragment!!.onActivityResult(targetRequestCode, which, data)
+    }
+}