fix: Improve Doctor's checkIfFileSaverDialogIsAvailable

app/src/main/java/app/myzel394/alibi/helpers/Doctor.kt

@@ -2,13 +2,33 @@ package app.myzel394.alibi.helpers
 
 import android.content.Context
 import android.content.Intent
+import android.content.pm.PackageManager
+import android.os.Build
 
 data class Doctor(
     val context: Context
 ) {
     fun checkIfFileSaverDialogIsAvailable(): Boolean {
-        val fileSaver = Intent(Intent.ACTION_OPEN_DOCUMENT_TREE)
+        // Since API 30, we can't query other packages so easily anymore
+        // (see https://developer.android.com/training/package-visibility).
+        // For now, we assume the user has a file saver app installed.
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
+            return true
+        }
 
-        return fileSaver.resolveActivity(context.packageManager) != null
+        val intent = Intent(Intent.ACTION_OPEN_DOCUMENT_TREE)
+        if (intent.resolveActivity(context.packageManager) != null) {
+            return true
+
+        }
+
+        val results =
+            context.packageManager.queryIntentActivities(intent, PackageManager.MATCH_DEFAULT_ONLY);
+
+        if (results.isNotEmpty()) {
+            return true;
+        }
+
+        return false
     }
 }