Show an alert/dialog when no appropriate file-manager was found

app/src/main/java/org/schabi/newpipe/streams/io/NoFileManagerHelper.java

@@ -0,0 +1,31 @@
+package org.schabi.newpipe.streams.io;
+
+import android.content.Context;
+
+import androidx.appcompat.app.AlertDialog;
+
+import org.schabi.newpipe.R;
+
+/**
+ * Helper for when no file-manager/activity was found.
+ */
+public final class NoFileManagerHelper {
+    private NoFileManagerHelper() {
+        // No impl
+    }
+
+    /**
+     * Shows an alert dialog when no file-manager is found.
+     * @param context Context
+     */
+    public static void showActivityNotFoundAlert(final Context context) {
+        new AlertDialog.Builder(context)
+                .setTitle(R.string.no_app_to_open_intent)
+                .setMessage(
+                        context.getString(
+                                R.string.no_appropriate_file_manager_message,
+                                context.getString(R.string.downloads_storage_use_saf_title)))
+                .setPositiveButton(R.string.ok, null)
+                .show();
+    }
+}