src/com/android/settings/wifi/NetworkRequestDialogFragment.java - platform/packages/apps/Settings - Git at Google

 /*
  * 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.Context;
 import android.content.DialogInterface;
 import android.graphics.drawable.Drawable;
 import android.net.wifi.ScanResult;
 import android.net.wifi.WifiConfiguration;
 import android.net.wifi.WifiManager.NetworkRequestMatchCallback;
 import android.net.wifi.WifiManager.NetworkRequestUserSelectionCallback;
 import android.os.Bundle;
 import android.text.TextUtils;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ArrayAdapter;
 import android.widget.BaseAdapter;
 import android.widget.Button;
 import android.widget.ProgressBar;
 import android.widget.TextView;

 import androidx.annotation.NonNull;
 import androidx.annotation.VisibleForTesting;
 import androidx.appcompat.app.AlertDialog;
 import androidx.preference.internal.PreferenceImageView;

 import com.android.settings.R;
 import com.android.settingslib.Utils;
 import com.android.settingslib.core.lifecycle.Lifecycle;
 import com.android.settingslib.wifi.AccessPoint;
 import com.android.settingslib.wifi.WifiTracker;
 import com.android.settingslib.wifi.WifiTrackerFactory;

 import java.util.ArrayList;
 import java.util.List;

 /**
  * The Fragment sets up callback {@link NetworkRequestMatchCallback} with framework. To handle most
  * behaviors of the callback when requesting wifi network, except for error message. When error
  * happens, {@link NetworkRequestErrorDialogFragment} will be called to display error message.
  */
 public class NetworkRequestDialogFragment extends NetworkRequestDialogBaseFragment implements
         DialogInterface.OnClickListener{

     /**
      * Spec defines there should be 5 wifi ap on the list at most or just show all if {@code
      * mShowLimitedItem} is false.
      */
     private static final int MAX_NUMBER_LIST_ITEM = 5;
     private boolean mShowLimitedItem = true;

     private List<AccessPoint> mAccessPointList;
     @VisibleForTesting
     FilterWifiTracker mFilterWifiTracker;
     private AccessPointAdapter mDialogAdapter;
     private NetworkRequestUserSelectionCallback mUserSelectionCallback;

     public static NetworkRequestDialogFragment newInstance() {
         NetworkRequestDialogFragment dialogFragment = new NetworkRequestDialogFragment();
         return dialogFragment;
     }

     @Override
     public Dialog onCreateDialog(Bundle savedInstanceState) {
         final Context context = getContext();

         // Prepares title.
         final LayoutInflater inflater = LayoutInflater.from(context);
         final View customTitle = inflater.inflate(R.layout.network_request_dialog_title, null);

         final TextView title = customTitle.findViewById(R.id.network_request_title_text);
         title.setText(getTitle());
         final TextView summary = customTitle.findViewById(R.id.network_request_summary_text);
         summary.setText(getSummary());

         final ProgressBar progressBar = customTitle.findViewById(
                 R.id.network_request_title_progress);
         progressBar.setVisibility(View.VISIBLE);

         // Prepares adapter.
         mDialogAdapter = new AccessPointAdapter(context,
                 R.layout.preference_access_point, getAccessPointList());

         final AlertDialog.Builder builder = new AlertDialog.Builder(context)
                 .setCustomTitle(customTitle)
                 .setAdapter(mDialogAdapter, this)
                 .setNegativeButton(R.string.cancel, (dialog, which) -> onCancel(dialog))
                 // Do nothings, will replace the onClickListener to avoid auto closing dialog.
                 .setNeutralButton(R.string.network_connection_request_dialog_showall,
                         null /* OnClickListener */);

         // Clicking list item is to connect wifi ap.
         final AlertDialog dialog = builder.create();
         dialog.getListView()
                 .setOnItemClickListener(
                         (parent, view, position, id) -> this.onClick(dialog, position));

         // Don't dismiss dialog when touching outside. User reports it is easy to touch outside.
         // This causes dialog to close.
         setCancelable(false);

         dialog.setOnShowListener((dialogInterface) -> {
             // Replace NeutralButton onClickListener to avoid closing dialog
             final Button neutralBtn = dialog.getButton(AlertDialog.BUTTON_NEUTRAL);
             neutralBtn.setVisibility(View.GONE);
             neutralBtn.setOnClickListener(v -> {
                 mShowLimitedItem = false;
                 renewAccessPointList(null /* scanResults */);
                 notifyAdapterRefresh();
                 neutralBtn.setVisibility(View.GONE);
             });
         });
         return dialog;
     }

     @NonNull
     List<AccessPoint> getAccessPointList() {
         // Initials list for adapter, in case of display crashing.
         if (mAccessPointList == null) {
             mAccessPointList = new ArrayList<>();
         }
         return mAccessPointList;
     }

     private BaseAdapter getDialogAdapter() {
         return mDialogAdapter;
     }

     @Override
     public void onClick(DialogInterface dialog, int which) {
         final List<AccessPoint> accessPointList = getAccessPointList();
         if (accessPointList.size() == 0) {
             return;  // Invalid values.
         }
         if (mUserSelectionCallback == null) {
             return; // Callback is missing or not ready.
         }

         if (which < accessPointList.size()) {
             final AccessPoint selectedAccessPoint = accessPointList.get(which);
             WifiConfiguration wifiConfig = selectedAccessPoint.getConfig();
             if (wifiConfig == null) {
                 wifiConfig = WifiUtils.getWifiConfig(selectedAccessPoint, /* scanResult */
                         null, /* password */ null);
             }

             if (wifiConfig != null) {
                 mUserSelectionCallback.select(wifiConfig);
             }
         }
     }

     @Override
     public void onCancel(@NonNull DialogInterface dialog) {
         super.onCancel(dialog);
         if (mUserSelectionCallback != null) {
             mUserSelectionCallback.reject();
         }
     }

     @Override
     public void onPause() {
         super.onPause();

         if (mFilterWifiTracker != null) {
             mFilterWifiTracker.onPause();
         }
     }

     @Override
     public void onDestroy() {
         super.onDestroy();

         if (mFilterWifiTracker != null) {
             mFilterWifiTracker.onDestroy();
             mFilterWifiTracker = null;
         }
     }

     private void showAllButton() {
         final AlertDialog alertDialog = (AlertDialog) getDialog();
         if (alertDialog == null) {
             return;
         }

         final Button neutralBtn = alertDialog.getButton(AlertDialog.BUTTON_NEUTRAL);
         if (neutralBtn != null) {
             neutralBtn.setVisibility(View.VISIBLE);
         }
     }

     private void hideProgressIcon() {
         final AlertDialog alertDialog = (AlertDialog) getDialog();
         if (alertDialog == null) {
             return;
         }

         final View progress = alertDialog.findViewById(R.id.network_request_title_progress);
         if (progress != null) {
             progress.setVisibility(View.GONE);
         }
     }

     @Override
     public void onResume() {
         super.onResume();

         if (mFilterWifiTracker == null) {
             mFilterWifiTracker = new FilterWifiTracker(getContext(), getSettingsLifecycle());
         }
         mFilterWifiTracker.onResume();
     }

     private class AccessPointAdapter extends ArrayAdapter<AccessPoint> {

         private final int mResourceId;
         private final LayoutInflater mInflater;

         public AccessPointAdapter(Context context, int resourceId, List<AccessPoint> objects) {
             super(context, resourceId, objects);
             mResourceId = resourceId;
             mInflater = LayoutInflater.from(context);
         }

         @Override
         public View getView(int position, View view, ViewGroup parent) {
             if (view == null) {
                 view = mInflater.inflate(mResourceId, parent, false);

                 final View divider = view.findViewById(
                         com.android.settingslib.R.id.two_target_divider);
                 divider.setVisibility(View.GONE);
             }

             final AccessPoint accessPoint = getItem(position);

             final TextView titleView = view.findViewById(android.R.id.title);
             if (titleView != null) {
                 // Shows whole SSID for better UX.
                 titleView.setSingleLine(false);
                 titleView.setText(accessPoint.getTitle());
             }

             final TextView summary = view.findViewById(android.R.id.summary);
             if (summary != null) {
                 final String summaryString = accessPoint.getSettingsSummary();
                 if (TextUtils.isEmpty(summaryString)) {
                     summary.setVisibility(View.GONE);
                 } else {
                     summary.setVisibility(View.VISIBLE);
                     summary.setText(summaryString);
                 }
             }

             final PreferenceImageView imageView = view.findViewById(android.R.id.icon);
             final int level = accessPoint.getLevel();
             if (imageView != null) {
                 final Drawable drawable = getContext().getDrawable(
                         Utils.getWifiIconResource(level));
                 drawable.setTintList(
                         Utils.getColorAttr(getContext(), android.R.attr.colorControlNormal));
                 imageView.setImageDrawable(drawable);
             }

             return view;
         }
     }

     @Override
     public void onUserSelectionCallbackRegistration(
             NetworkRequestUserSelectionCallback userSelectionCallback) {
         mUserSelectionCallback = userSelectionCallback;
     }

     @Override
     public void onMatch(List<ScanResult> scanResults) {
         // Shouldn't need to renew cached list, since input result is empty.
         if (scanResults != null && scanResults.size() > 0) {
             renewAccessPointList(scanResults);

             notifyAdapterRefresh();
         }
     }

     // Updates internal AccessPoint list from WifiTracker. scanResults are used to update key list
     // of AccessPoint, and could be null if there is no necessary to update key list.
     private void renewAccessPointList(List<ScanResult> scanResults) {
         if (mFilterWifiTracker == null) {
             return;
         }

         // TODO(b/119846365): Checks if we could escalate the converting effort.
         // Updates keys of scanResults into FilterWifiTracker for updating matched AccessPoints.
         if (scanResults != null) {
             mFilterWifiTracker.updateKeys(scanResults);
         }

         // Re-gets matched AccessPoints from WifiTracker.
         final List<AccessPoint> list = getAccessPointList();
         list.clear();
         list.addAll(mFilterWifiTracker.getAccessPoints());
     }

     @VisibleForTesting
     void notifyAdapterRefresh() {
         if (getDialogAdapter() != null) {
             getDialogAdapter().notifyDataSetChanged();
         }
     }

     @VisibleForTesting
     final class FilterWifiTracker {
         private final List<String> mAccessPointKeys;
         private final WifiTracker mWifiTracker;
         private final Context mContext;

         public FilterWifiTracker(Context context, Lifecycle lifecycle) {
             mWifiTracker = WifiTrackerFactory.create(context, mWifiListener,
                     lifecycle, /* includeSaved */ true, /* includeScans */ true);
             mAccessPointKeys = new ArrayList<>();
             mContext = context;
         }

         /**
          * Updates key list from input. {@code onMatch()} may be called in multi-times according
          * wifi scanning result, so needs patchwork here.
          */
         public void updateKeys(List<ScanResult> scanResults) {
             for (ScanResult scanResult : scanResults) {
                 final String key = AccessPoint.getKey(mContext, scanResult);
                 if (!mAccessPointKeys.contains(key)) {
                     mAccessPointKeys.add(key);
                 }
             }
         }

         /**
          * Returns only AccessPoints whose key is in {@code mAccessPointKeys}.
          *
          * @return List of matched AccessPoints.
          */
         public List<AccessPoint> getAccessPoints() {
             final List<AccessPoint> allAccessPoints = mWifiTracker.getAccessPoints();
             final List<AccessPoint> result = new ArrayList<>();

             // The order should be kept, because order means wifi score (sorting in WifiTracker).
             int count = 0;
             for (AccessPoint accessPoint : allAccessPoints) {
                 final String key = accessPoint.getKey();
                 if (mAccessPointKeys.contains(key)) {
                     result.add(accessPoint);

                     count++;
                     // Limits how many count of items could show.
                     if (mShowLimitedItem && count >= MAX_NUMBER_LIST_ITEM) {
                         break;
                     }
                 }
             }

             // Update related UI buttons
             if (mShowLimitedItem && (count >= MAX_NUMBER_LIST_ITEM)) {
                 showAllButton();
             }
             if (count > 0) {
                 hideProgressIcon();
             }

             return result;
         }

         @VisibleForTesting
         WifiTracker.WifiListener mWifiListener = new WifiTracker.WifiListener() {

             @Override
             public void onWifiStateChanged(int state) {
                 notifyAdapterRefresh();
             }

             @Override
             public void onConnectedChanged() {
                 notifyAdapterRefresh();
             }

             @Override
             public void onAccessPointsChanged() {
                 renewAccessPointList(null /* scanResults */);
                 notifyAdapterRefresh();
             }
         };

         public void onDestroy() {
             if (mWifiTracker != null) {
                 mWifiTracker.onDestroy();
             }
         }

         public void onResume() {
             if (mWifiTracker != null) {
                 mWifiTracker.onStart();
             }
         }

         public void onPause() {
             if (mWifiTracker != null) {
                 mWifiTracker.onStop();
             }
         }
     }
 }
	/*
	* 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.Context;
	import android.content.DialogInterface;
	import android.graphics.drawable.Drawable;
	import android.net.wifi.ScanResult;
	import android.net.wifi.WifiConfiguration;
	import android.net.wifi.WifiManager.NetworkRequestMatchCallback;
	import android.net.wifi.WifiManager.NetworkRequestUserSelectionCallback;
	import android.os.Bundle;
	import android.text.TextUtils;
	import android.view.LayoutInflater;
	import android.view.View;
	import android.view.ViewGroup;
	import android.widget.ArrayAdapter;
	import android.widget.BaseAdapter;
	import android.widget.Button;
	import android.widget.ProgressBar;
	import android.widget.TextView;

	import androidx.annotation.NonNull;
	import androidx.annotation.VisibleForTesting;
	import androidx.appcompat.app.AlertDialog;
	import androidx.preference.internal.PreferenceImageView;

	import com.android.settings.R;
	import com.android.settingslib.Utils;
	import com.android.settingslib.core.lifecycle.Lifecycle;
	import com.android.settingslib.wifi.AccessPoint;
	import com.android.settingslib.wifi.WifiTracker;
	import com.android.settingslib.wifi.WifiTrackerFactory;

	import java.util.ArrayList;
	import java.util.List;

	/**
	* The Fragment sets up callback {@link NetworkRequestMatchCallback} with framework. To handle most
	* behaviors of the callback when requesting wifi network, except for error message. When error
	* happens, {@link NetworkRequestErrorDialogFragment} will be called to display error message.
	*/
	public class NetworkRequestDialogFragment extends NetworkRequestDialogBaseFragment implements
	DialogInterface.OnClickListener{

	/**
	* Spec defines there should be 5 wifi ap on the list at most or just show all if {@code
	* mShowLimitedItem} is false.
	*/
	private static final int MAX_NUMBER_LIST_ITEM = 5;
	private boolean mShowLimitedItem = true;

	private List<AccessPoint> mAccessPointList;
	@VisibleForTesting
	FilterWifiTracker mFilterWifiTracker;
	private AccessPointAdapter mDialogAdapter;
	private NetworkRequestUserSelectionCallback mUserSelectionCallback;

	public static NetworkRequestDialogFragment newInstance() {
	NetworkRequestDialogFragment dialogFragment = new NetworkRequestDialogFragment();
	return dialogFragment;
	}

	@Override
	public Dialog onCreateDialog(Bundle savedInstanceState) {
	final Context context = getContext();

	// Prepares title.
	final LayoutInflater inflater = LayoutInflater.from(context);
	final View customTitle = inflater.inflate(R.layout.network_request_dialog_title, null);

	final TextView title = customTitle.findViewById(R.id.network_request_title_text);
	title.setText(getTitle());
	final TextView summary = customTitle.findViewById(R.id.network_request_summary_text);
	summary.setText(getSummary());

	final ProgressBar progressBar = customTitle.findViewById(
	R.id.network_request_title_progress);
	progressBar.setVisibility(View.VISIBLE);

	// Prepares adapter.
	mDialogAdapter = new AccessPointAdapter(context,
	R.layout.preference_access_point, getAccessPointList());

	final AlertDialog.Builder builder = new AlertDialog.Builder(context)
	.setCustomTitle(customTitle)
	.setAdapter(mDialogAdapter, this)
	.setNegativeButton(R.string.cancel, (dialog, which) -> onCancel(dialog))
	// Do nothings, will replace the onClickListener to avoid auto closing dialog.
	.setNeutralButton(R.string.network_connection_request_dialog_showall,
	null /* OnClickListener */);

	// Clicking list item is to connect wifi ap.
	final AlertDialog dialog = builder.create();
	dialog.getListView()
	.setOnItemClickListener(
	(parent, view, position, id) -> this.onClick(dialog, position));

	// Don't dismiss dialog when touching outside. User reports it is easy to touch outside.
	// This causes dialog to close.
	setCancelable(false);

	dialog.setOnShowListener((dialogInterface) -> {
	// Replace NeutralButton onClickListener to avoid closing dialog
	final Button neutralBtn = dialog.getButton(AlertDialog.BUTTON_NEUTRAL);
	neutralBtn.setVisibility(View.GONE);
	neutralBtn.setOnClickListener(v -> {
	mShowLimitedItem = false;
	renewAccessPointList(null /* scanResults */);
	notifyAdapterRefresh();
	neutralBtn.setVisibility(View.GONE);
	});
	});
	return dialog;
	}

	@NonNull
	List<AccessPoint> getAccessPointList() {
	// Initials list for adapter, in case of display crashing.
	if (mAccessPointList == null) {
	mAccessPointList = new ArrayList<>();
	}
	return mAccessPointList;
	}

	private BaseAdapter getDialogAdapter() {
	return mDialogAdapter;
	}

	@Override
	public void onClick(DialogInterface dialog, int which) {
	final List<AccessPoint> accessPointList = getAccessPointList();
	if (accessPointList.size() == 0) {
	return; // Invalid values.
	}
	if (mUserSelectionCallback == null) {
	return; // Callback is missing or not ready.
	}

	if (which < accessPointList.size()) {
	final AccessPoint selectedAccessPoint = accessPointList.get(which);
	WifiConfiguration wifiConfig = selectedAccessPoint.getConfig();
	if (wifiConfig == null) {
	wifiConfig = WifiUtils.getWifiConfig(selectedAccessPoint, /* scanResult */
	null, /* password */ null);
	}

	if (wifiConfig != null) {
	mUserSelectionCallback.select(wifiConfig);
	}
	}
	}

	@Override
	public void onCancel(@NonNull DialogInterface dialog) {
	super.onCancel(dialog);
	if (mUserSelectionCallback != null) {
	mUserSelectionCallback.reject();
	}
	}

	@Override
	public void onPause() {
	super.onPause();

	if (mFilterWifiTracker != null) {
	mFilterWifiTracker.onPause();
	}
	}

	@Override
	public void onDestroy() {
	super.onDestroy();

	if (mFilterWifiTracker != null) {
	mFilterWifiTracker.onDestroy();
	mFilterWifiTracker = null;
	}
	}

	private void showAllButton() {
	final AlertDialog alertDialog = (AlertDialog) getDialog();
	if (alertDialog == null) {
	return;
	}

	final Button neutralBtn = alertDialog.getButton(AlertDialog.BUTTON_NEUTRAL);
	if (neutralBtn != null) {
	neutralBtn.setVisibility(View.VISIBLE);
	}
	}

	private void hideProgressIcon() {
	final AlertDialog alertDialog = (AlertDialog) getDialog();
	if (alertDialog == null) {
	return;
	}

	final View progress = alertDialog.findViewById(R.id.network_request_title_progress);
	if (progress != null) {
	progress.setVisibility(View.GONE);
	}
	}

	@Override
	public void onResume() {
	super.onResume();

	if (mFilterWifiTracker == null) {
	mFilterWifiTracker = new FilterWifiTracker(getContext(), getSettingsLifecycle());
	}
	mFilterWifiTracker.onResume();
	}

	private class AccessPointAdapter extends ArrayAdapter<AccessPoint> {

	private final int mResourceId;
	private final LayoutInflater mInflater;

	public AccessPointAdapter(Context context, int resourceId, List<AccessPoint> objects) {
	super(context, resourceId, objects);
	mResourceId = resourceId;
	mInflater = LayoutInflater.from(context);
	}

	@Override
	public View getView(int position, View view, ViewGroup parent) {
	if (view == null) {
	view = mInflater.inflate(mResourceId, parent, false);

	final View divider = view.findViewById(
	com.android.settingslib.R.id.two_target_divider);
	divider.setVisibility(View.GONE);
	}

	final AccessPoint accessPoint = getItem(position);

	final TextView titleView = view.findViewById(android.R.id.title);
	if (titleView != null) {
	// Shows whole SSID for better UX.
	titleView.setSingleLine(false);
	titleView.setText(accessPoint.getTitle());
	}

	final TextView summary = view.findViewById(android.R.id.summary);
	if (summary != null) {
	final String summaryString = accessPoint.getSettingsSummary();
	if (TextUtils.isEmpty(summaryString)) {
	summary.setVisibility(View.GONE);
	} else {
	summary.setVisibility(View.VISIBLE);
	summary.setText(summaryString);
	}
	}

	final PreferenceImageView imageView = view.findViewById(android.R.id.icon);
	final int level = accessPoint.getLevel();
	if (imageView != null) {
	final Drawable drawable = getContext().getDrawable(
	Utils.getWifiIconResource(level));
	drawable.setTintList(
	Utils.getColorAttr(getContext(), android.R.attr.colorControlNormal));
	imageView.setImageDrawable(drawable);
	}

	return view;
	}
	}

	@Override
	public void onUserSelectionCallbackRegistration(
	NetworkRequestUserSelectionCallback userSelectionCallback) {
	mUserSelectionCallback = userSelectionCallback;
	}

	@Override
	public void onMatch(List<ScanResult> scanResults) {
	// Shouldn't need to renew cached list, since input result is empty.
	if (scanResults != null && scanResults.size() > 0) {
	renewAccessPointList(scanResults);

	notifyAdapterRefresh();
	}
	}

	// Updates internal AccessPoint list from WifiTracker. scanResults are used to update key list
	// of AccessPoint, and could be null if there is no necessary to update key list.
	private void renewAccessPointList(List<ScanResult> scanResults) {
	if (mFilterWifiTracker == null) {
	return;
	}

	// TODO(b/119846365): Checks if we could escalate the converting effort.
	// Updates keys of scanResults into FilterWifiTracker for updating matched AccessPoints.
	if (scanResults != null) {
	mFilterWifiTracker.updateKeys(scanResults);
	}

	// Re-gets matched AccessPoints from WifiTracker.
	final List<AccessPoint> list = getAccessPointList();
	list.clear();
	list.addAll(mFilterWifiTracker.getAccessPoints());
	}

	@VisibleForTesting
	void notifyAdapterRefresh() {
	if (getDialogAdapter() != null) {
	getDialogAdapter().notifyDataSetChanged();
	}
	}

	@VisibleForTesting
	final class FilterWifiTracker {
	private final List<String> mAccessPointKeys;
	private final WifiTracker mWifiTracker;
	private final Context mContext;

	public FilterWifiTracker(Context context, Lifecycle lifecycle) {
	mWifiTracker = WifiTrackerFactory.create(context, mWifiListener,
	lifecycle, /* includeSaved / true, / includeScans */ true);
	mAccessPointKeys = new ArrayList<>();
	mContext = context;
	}

	/**
	* Updates key list from input. {@code onMatch()} may be called in multi-times according
	* wifi scanning result, so needs patchwork here.
	*/
	public void updateKeys(List<ScanResult> scanResults) {
	for (ScanResult scanResult : scanResults) {
	final String key = AccessPoint.getKey(mContext, scanResult);
	if (!mAccessPointKeys.contains(key)) {
	mAccessPointKeys.add(key);
	}
	}
	}

	/**
	* Returns only AccessPoints whose key is in {@code mAccessPointKeys}.
	*
	* @return List of matched AccessPoints.
	*/
	public List<AccessPoint> getAccessPoints() {
	final List<AccessPoint> allAccessPoints = mWifiTracker.getAccessPoints();
	final List<AccessPoint> result = new ArrayList<>();

	// The order should be kept, because order means wifi score (sorting in WifiTracker).
	int count = 0;
	for (AccessPoint accessPoint : allAccessPoints) {
	final String key = accessPoint.getKey();
	if (mAccessPointKeys.contains(key)) {
	result.add(accessPoint);

	count++;
	// Limits how many count of items could show.
	if (mShowLimitedItem && count >= MAX_NUMBER_LIST_ITEM) {
	break;
	}
	}
	}

	// Update related UI buttons
	if (mShowLimitedItem && (count >= MAX_NUMBER_LIST_ITEM)) {
	showAllButton();
	}
	if (count > 0) {
	hideProgressIcon();
	}

	return result;
	}

	@VisibleForTesting
	WifiTracker.WifiListener mWifiListener = new WifiTracker.WifiListener() {

	@Override
	public void onWifiStateChanged(int state) {
	notifyAdapterRefresh();
	}

	@Override
	public void onConnectedChanged() {
	notifyAdapterRefresh();
	}

	@Override
	public void onAccessPointsChanged() {
	renewAccessPointList(null /* scanResults */);
	notifyAdapterRefresh();
	}
	};

	public void onDestroy() {
	if (mWifiTracker != null) {
	mWifiTracker.onDestroy();
	}
	}

	public void onResume() {
	if (mWifiTracker != null) {
	mWifiTracker.onStart();
	}
	}

	public void onPause() {
	if (mWifiTracker != null) {
	mWifiTracker.onStop();
	}
	}
	}
	}