Implement NetworkRequestDialog architecture(cont.)

For NetworkRequestTimeoutDialogFragment, the dialog show after WiFi
scanning timeout or get no WiFi ap to list. Dialog will ask if user
want to continue scanning or cancel.

Bug: 117399926
Test: RunSettingsRoboTests
Change-Id: I0551a753c10265e69a7830833813852a95eab5ef

src/com/android/settings/wifi/NetworkRequestTimeoutDialogFragment.java

@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2018 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.wifi;
+
+import android.app.Dialog;
+import android.content.DialogInterface;
+import android.os.Bundle;
+import androidx.appcompat.app.AlertDialog;
+import com.android.internal.logging.nano.MetricsProto;
+import com.android.settings.R;
+import com.android.settings.core.instrumentation.InstrumentedDialogFragment;
+
+public class NetworkRequestTimeoutDialogFragment extends InstrumentedDialogFragment implements
+    DialogInterface.OnClickListener {
+
+  public static NetworkRequestTimeoutDialogFragment newInstance() {
+    NetworkRequestTimeoutDialogFragment fragment = new NetworkRequestTimeoutDialogFragment();
+    return fragment;
+  }
+
+  @Override
+  public Dialog onCreateDialog(Bundle savedInstanceState) {
+    AlertDialog.Builder builder = new AlertDialog.Builder(getContext())
+        .setMessage(R.string.network_connection_timeout_dialog_message)
+        .setPositiveButton(R.string.network_connection_timeout_dialog_ok, this)
+        .setNegativeButton(R.string.cancel, null);
+    return builder.create();
+  }
+
+  @Override
+  public int getMetricsCategory() {
+    return MetricsProto.MetricsEvent.WIFI_SCANNING_NEEDED_DIALOG;
+  }
+
+  @Override
+  public void onClick(DialogInterface dialog, int which) {
+    switch (which) {
+      case DialogInterface.BUTTON_POSITIVE:
+        startScanningDialog();
+        break;
+      case DialogInterface.BUTTON_NEGATIVE:
+      default:
+        // Do nothing.
+        break;
+    }
+  }
+
+  protected void startScanningDialog() {
+    NetworkRequestDialogFragment fragment = NetworkRequestDialogFragment.newInstance();
+    fragment.show(getActivity().getSupportFragmentManager(), null);
+  }
+}