Refactor add network page

WifiDialog.java can be launched as "full screen mode"
in some use cases. However the way it's done is that
it uses theme to fake the full screen appearance.
It just feels hacky to use a dialog for full screen UI.
So, we created an "AddNetworkFragment" to make this
page can look like a normal fragment.

Also, clean up some useless code about "full screen mode"
of WifiDialog.

Change-Id: Iedd04c6a8e403cbceb872313314e1cba0d514246
Fixes: 111875856
Test: robo test, manual test

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

@@ -0,0 +1,159 @@
+/*
+ * 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.Activity;
+import android.content.Intent;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Button;
+
+import androidx.annotation.VisibleForTesting;
+
+import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
+import com.android.settings.R;
+import com.android.settings.core.InstrumentedFragment;
+
+public class AddNetworkFragment extends InstrumentedFragment implements WifiConfigUiBase,
+        View.OnClickListener {
+
+    final static String WIFI_CONFIG_KEY = "wifi_config_key";
+    @VisibleForTesting
+    final static int SUBMIT_BUTTON_ID = android.R.id.button1;
+    @VisibleForTesting
+    final static int CANCEL_BUTTON_ID = android.R.id.button2;
+
+    private WifiConfigController mUIController;
+    private Button mSubmitBtn;
+    private Button mCancelBtn;
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+    }
+
+    @Override
+    public int getMetricsCategory() {
+        return MetricsEvent.SETTINGS_WIFI_ADD_NETWORK;
+    }
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+            Bundle savedInstanceState) {
+        final View rootView = inflater.inflate(R.layout.wifi_add_network_view, container, false);
+
+        mSubmitBtn = rootView.findViewById(SUBMIT_BUTTON_ID);
+        mCancelBtn = rootView.findViewById(CANCEL_BUTTON_ID);
+        mSubmitBtn.setOnClickListener(this);
+        mCancelBtn.setOnClickListener(this);
+        mUIController = new WifiConfigController(this, rootView, null, getMode());
+
+        return rootView;
+    }
+
+    @Override
+    public void onViewStateRestored(Bundle savedInstanceState) {
+        super.onViewStateRestored(savedInstanceState);
+        mUIController.updatePassword();
+    }
+
+    @Override
+    public void onClick(View view) {
+        switch (view.getId()) {
+            case SUBMIT_BUTTON_ID:
+                handleSubmitAction();
+                break;
+            case CANCEL_BUTTON_ID:
+                handleCancelAction();
+                break;
+        }
+    }
+
+    @Override
+    public int getMode() {
+        return WifiConfigUiBase.MODE_CONNECT;
+    }
+
+    @Override
+    public WifiConfigController getController() {
+        return mUIController;
+    }
+
+    @Override
+    public void dispatchSubmit() {
+        handleSubmitAction();
+    }
+
+    @Override
+    public void setTitle(int id) {
+        getActivity().setTitle(id);
+    }
+
+    @Override
+    public void setTitle(CharSequence title) {
+        getActivity().setTitle(title);
+    }
+
+    @Override
+    public void setSubmitButton(CharSequence text) {
+        mSubmitBtn.setText(text);
+    }
+
+    @Override
+    public void setCancelButton(CharSequence text) {
+        mCancelBtn.setText(text);
+    }
+
+    @Override
+    public void setForgetButton(CharSequence text) {
+        // AddNetwork doesn't need forget button.
+    }
+
+    @Override
+    public Button getSubmitButton() {
+        return mSubmitBtn;
+    }
+
+    @Override
+    public Button getCancelButton() {
+        return mCancelBtn;
+    }
+
+    @Override
+    public Button getForgetButton() {
+        // AddNetwork doesn't need forget button.
+        return null;
+    }
+
+    @VisibleForTesting
+    void handleSubmitAction() {
+        final Intent intent = new Intent();
+        final Activity activity = getActivity();
+        intent.putExtra(WIFI_CONFIG_KEY, mUIController.getConfig());
+        activity.setResult(Activity.RESULT_OK, intent);
+        activity.finish();
+    }
+
+    @VisibleForTesting
+    void handleCancelAction() {
+        final Activity activity = getActivity();
+        activity.setResult(Activity.RESULT_CANCELED);
+        activity.finish();
+    }
+}