[Tetheirng] Show a dialog indicate tethering is unsupported by carrier.

Bug: 161206517
Test: manual
Change-Id: I45a2e42367850ab6fc901fe508671677d843b793

src/com/android/settings/network/TetherProvisioningCarrierDialogActivity.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.network;
+
+import android.app.Activity;
+import android.app.AlertDialog;
+import android.content.DialogInterface;
+import android.os.Bundle;
+
+import com.android.settings.R;
+
+/**
+ * To show a dialog to indicate tethering is unsupported by carrier.
+ */
+public class TetherProvisioningCarrierDialogActivity extends Activity {
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        new AlertDialog.Builder(this)
+                .setTitle(R.string.wifi_tether_carrier_unsupport_dialog_title)
+                .setMessage(R.string.wifi_tether_carrier_unsupport_dialog_content)
+                .setCancelable(false)
+                .setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
+                    public void onClick(DialogInterface dialog, int which) {
+                        dialog.cancel();
+                        finish();
+                    }
+                })
+                .show();
+    }
+}
+