b962d6566c
Current UI shows nothing when there's no connection available, even when the device is finding some. So user cannot know whether the static "Not connected" screen means: the device is finding right now, or actually no network is available. Change-Id: Ia8ea1c66956e8de819f6a98362bcc9086bda172c
679 lines
25 KiB
Java
679 lines
25 KiB
Java
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.settings.wifi;
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import com.android.settings.ProgressCategoryBase;
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import com.android.settings.R;
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import com.android.settings.SettingsPreferenceFragment;
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import android.app.Activity;
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import android.content.BroadcastReceiver;
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import android.content.Context;
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import android.content.DialogInterface;
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import android.content.Intent;
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import android.content.IntentFilter;
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import android.net.ConnectivityManager;
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import android.net.NetworkInfo;
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import android.net.NetworkInfo.DetailedState;
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import android.net.wifi.ScanResult;
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import android.net.wifi.SupplicantState;
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import android.net.wifi.WifiConfiguration;
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import android.net.wifi.WifiConfiguration.KeyMgmt;
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import android.net.wifi.WifiInfo;
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import android.net.wifi.WifiManager;
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import android.os.Bundle;
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import android.os.Handler;
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import android.os.Message;
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import android.preference.CheckBoxPreference;
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import android.preference.Preference;
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import android.preference.PreferenceScreen;
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import android.provider.Settings.Secure;
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import android.security.Credentials;
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import android.security.KeyStore;
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import android.util.Log;
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import android.view.ContextMenu;
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import android.view.ContextMenu.ContextMenuInfo;
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import android.view.Menu;
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import android.view.MenuInflater;
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import android.view.MenuItem;
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import android.view.View;
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import android.widget.AdapterView.AdapterContextMenuInfo;
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import android.widget.Button;
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import android.widget.Toast;
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import java.util.Collection;
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import java.util.List;
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import java.util.TreeSet;
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/**
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* This currently provides three types of UI.
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*
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* Two are for phones with relatively small screens: "for SetupWizard" and "for usual Settings".
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* Users just need to launch WifiSettings Activity as usual. The request will be appropriately
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* handled by ActivityManager, and they will have appropriate look-and-feel with this fragment.
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*
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* Third type is for Setup Wizard with X-Large, landscape UI. Users need to launch
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* {@link WifiSettingsForSetupWizardXL} Activity, which contains this fragment but also has
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* other decorations specific to that screen.
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*/
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public class WifiSettings extends SettingsPreferenceFragment
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implements DialogInterface.OnClickListener {
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private static final int MENU_ID_SCAN = Menu.FIRST;
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private static final int MENU_ID_ADVANCED = Menu.FIRST + 1;
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private static final int MENU_ID_CONNECT = Menu.FIRST + 2;
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private static final int MENU_ID_FORGET = Menu.FIRST + 3;
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private static final int MENU_ID_MODIFY = Menu.FIRST + 4;
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// Indicates that this fragment is used as a part of Setup Wizard with XL screen settings.
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// This fragment should show information which has been shown as Dialog in combined UI
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// inside this fragment.
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/* package */ static final String IN_XL_SETUP_WIZARD = "in_setup_wizard";
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// this boolean extra specifies whether to disable the Next button when not connected
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// Note: this is only effective in Setup Wizard with XL screen size.
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private static final String EXTRA_ENABLE_NEXT_ON_CONNECT = "wifi_enable_next_on_connect";
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private final IntentFilter mFilter;
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private final BroadcastReceiver mReceiver;
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private final Scanner mScanner;
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private WifiManager mWifiManager;
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private WifiEnabler mWifiEnabler;
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private CheckBoxPreference mNotifyOpenNetworks;
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private ProgressCategoryBase mAccessPoints;
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private Preference mAddNetwork;
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// An access point being editted is stored here.
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private AccessPoint mSelectedAccessPoint;
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private DetailedState mLastState;
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private WifiInfo mLastInfo;
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private int mKeyStoreNetworkId = -1;
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// should Next button only be enabled when we have a connection?
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private boolean mEnableNextOnConnection;
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private boolean mInXlSetupWizard;
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// TODO: merge into one
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private WifiConfigPreference mConfigPreference;
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private WifiDialog mDialog;
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private boolean mRefrainListUpdate;
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public WifiSettings() {
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mFilter = new IntentFilter();
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mFilter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION);
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mFilter.addAction(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION);
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mFilter.addAction(WifiManager.NETWORK_IDS_CHANGED_ACTION);
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mFilter.addAction(WifiManager.SUPPLICANT_STATE_CHANGED_ACTION);
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mFilter.addAction(WifiManager.SUPPLICANT_CONFIG_CHANGED_ACTION);
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mFilter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);
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mFilter.addAction(WifiManager.RSSI_CHANGED_ACTION);
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mReceiver = new BroadcastReceiver() {
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@Override
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public void onReceive(Context context, Intent intent) {
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handleEvent(intent);
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}
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};
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mScanner = new Scanner();
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}
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@Override
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public void onActivityCreated(Bundle savedInstanceState) {
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// We don't call super.onActivityCreated() here, since it assumes we already set up
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// Preference (probably in onCreate()), while WifiSettings exceptionally set it up in
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// this method.
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mWifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
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final Activity activity = getActivity();
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final Intent intent = activity.getIntent();
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mInXlSetupWizard = intent.getBooleanExtra(IN_XL_SETUP_WIZARD, false);
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// if we're supposed to enable/disable the Next button based on our current connection
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// state, start it off in the right state
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mEnableNextOnConnection = intent.getBooleanExtra(EXTRA_ENABLE_NEXT_ON_CONNECT, false);
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if (mEnableNextOnConnection) {
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if (mEnableNextOnConnection && hasNextButton()) {
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final ConnectivityManager connectivity = (ConnectivityManager)
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getActivity().getSystemService(Context.CONNECTIVITY_SERVICE);
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if (connectivity != null) {
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NetworkInfo info = connectivity.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
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changeNextButtonState(info.isConnected());
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}
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}
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}
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if (mInXlSetupWizard) {
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addPreferencesFromResource(R.xml.wifi_access_points_for_wifi_setup_xl);
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} else if (intent.getBooleanExtra("only_access_points", false)) {
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addPreferencesFromResource(R.xml.wifi_access_points);
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} else {
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addPreferencesFromResource(R.xml.wifi_settings);
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mWifiEnabler = new WifiEnabler(activity,
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(CheckBoxPreference) findPreference("enable_wifi"));
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mNotifyOpenNetworks =
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(CheckBoxPreference) findPreference("notify_open_networks");
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mNotifyOpenNetworks.setChecked(Secure.getInt(getContentResolver(),
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Secure.WIFI_NETWORKS_AVAILABLE_NOTIFICATION_ON, 0) == 1);
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}
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// After confirming PreferenceScreen is available, we call super.
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super.onActivityCreated(savedInstanceState);
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// This may be either ProgressCategory or AccessPointCategoryForXL.
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final ProgressCategoryBase preference =
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(ProgressCategoryBase) findPreference("access_points");
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mAccessPoints = preference;
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mAccessPoints.setOrderingAsAdded(true);
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mAddNetwork = findPreference("add_network");
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registerForContextMenu(getListView());
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setHasOptionsMenu(true);
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}
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@Override
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public void onResume() {
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super.onResume();
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if (mWifiEnabler != null) {
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mWifiEnabler.resume();
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}
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getActivity().registerReceiver(mReceiver, mFilter);
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if (mKeyStoreNetworkId != -1 && KeyStore.getInstance().test() == KeyStore.NO_ERROR) {
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mWifiManager.connectNetwork(mKeyStoreNetworkId);
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}
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mKeyStoreNetworkId = -1;
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if (mInXlSetupWizard) {
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// We show "Now scanning"
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final int wifiState = mWifiManager.getWifiState();
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switch (wifiState) {
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case WifiManager.WIFI_STATE_ENABLED: {
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updateAccessPoints();
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break;
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}
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case WifiManager.WIFI_STATE_DISABLED:
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case WifiManager.WIFI_STATE_DISABLING:
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case WifiManager.WIFI_STATE_UNKNOWN: {
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mWifiManager.setWifiEnabled(true);
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} // $FALL-THROUGH$
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default: {
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mAccessPoints.removeAll();
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Preference preference = new Preference(getActivity());
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preference.setLayoutResource(R.layout.preference_widget_shortcut);
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preference.setSelectable(false);
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preference.setTitle("Connecting");
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preference.setSummary("COONNECTING");
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mAccessPoints.addPreference(preference);
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break;
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}
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}
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} else {
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updateAccessPoints();
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}
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}
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@Override
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public void onPause() {
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super.onPause();
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if (mWifiEnabler != null) {
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mWifiEnabler.pause();
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}
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getActivity().unregisterReceiver(mReceiver);
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mScanner.pause();
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if (mDialog != null) {
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mDialog.dismiss();
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mDialog = null;
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}
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}
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@Override
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public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
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// We don't want menus in Setup Wizard XL.
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if (!mInXlSetupWizard) {
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menu.add(Menu.NONE, MENU_ID_SCAN, 0, R.string.wifi_menu_scan)
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.setIcon(R.drawable.ic_menu_scan_network);
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menu.add(Menu.NONE, MENU_ID_ADVANCED, 0, R.string.wifi_menu_advanced)
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.setIcon(android.R.drawable.ic_menu_manage);
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}
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super.onCreateOptionsMenu(menu, inflater);
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}
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@Override
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public boolean onOptionsItemSelected(MenuItem item) {
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switch (item.getItemId()) {
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case MENU_ID_SCAN:
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if (mWifiManager.isWifiEnabled()) {
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mScanner.resume();
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}
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return true;
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case MENU_ID_ADVANCED:
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startActivity(new Intent(getActivity(), AdvancedSettings.class));
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return true;
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}
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return super.onOptionsItemSelected(item);
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}
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@Override
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public void onCreateContextMenu(ContextMenu menu, View view, ContextMenuInfo info) {
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if (info instanceof AdapterContextMenuInfo) {
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Preference preference = (Preference) getListView().getItemAtPosition(
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((AdapterContextMenuInfo) info).position);
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if (preference instanceof AccessPoint) {
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mSelectedAccessPoint = (AccessPoint) preference;
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menu.setHeaderTitle(mSelectedAccessPoint.ssid);
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if (mSelectedAccessPoint.getLevel() != -1
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&& mSelectedAccessPoint.getState() == null) {
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menu.add(Menu.NONE, MENU_ID_CONNECT, 0, R.string.wifi_menu_connect);
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}
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if (mSelectedAccessPoint.networkId != -1) {
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menu.add(Menu.NONE, MENU_ID_FORGET, 0, R.string.wifi_menu_forget);
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menu.add(Menu.NONE, MENU_ID_MODIFY, 0, R.string.wifi_menu_modify);
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}
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}
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}
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}
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@Override
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public boolean onContextItemSelected(MenuItem item) {
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if (mSelectedAccessPoint == null) {
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return super.onContextItemSelected(item);
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}
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switch (item.getItemId()) {
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case MENU_ID_CONNECT: {
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if (mSelectedAccessPoint.networkId != -1) {
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if (!requireKeyStore(mSelectedAccessPoint.getConfig())) {
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mWifiManager.connectNetwork(mSelectedAccessPoint.networkId);
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}
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} else if (mSelectedAccessPoint.security == AccessPoint.SECURITY_NONE) {
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// Shortcut for open networks.
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WifiConfiguration config = new WifiConfiguration();
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config.SSID = AccessPoint.convertToQuotedString(mSelectedAccessPoint.ssid);
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config.allowedKeyManagement.set(KeyMgmt.NONE);
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mWifiManager.connectNetwork(config);
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} else {
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showConfigUi(mSelectedAccessPoint, true);
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}
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return true;
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}
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case MENU_ID_FORGET: {
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mWifiManager.forgetNetwork(mSelectedAccessPoint.networkId);
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return true;
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}
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case MENU_ID_MODIFY: {
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showConfigUi(mSelectedAccessPoint, true);
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return true;
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}
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}
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return super.onContextItemSelected(item);
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}
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@Override
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public boolean onPreferenceTreeClick(PreferenceScreen screen, Preference preference) {
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if (preference instanceof AccessPoint) {
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mSelectedAccessPoint = (AccessPoint) preference;
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showConfigUi(mSelectedAccessPoint, false);
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} else if (preference == mAddNetwork) {
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onAddNetworkPressed();
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} else if (preference == mNotifyOpenNetworks) {
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Secure.putInt(getContentResolver(),
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Secure.WIFI_NETWORKS_AVAILABLE_NOTIFICATION_ON,
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mNotifyOpenNetworks.isChecked() ? 1 : 0);
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} else {
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return super.onPreferenceTreeClick(screen, preference);
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}
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return true;
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}
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/**
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* Called when a user clicks "Add network" preference or relevant button.
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*/
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private void showConfigUi(AccessPoint accessPoint, boolean edit) {
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synchronized (this) {
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mRefrainListUpdate = false;
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}
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if (mInXlSetupWizard) {
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final Activity activity = getActivity();
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activity.findViewById(R.id.wifi_setup_connect).setVisibility(View.VISIBLE);
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activity.findViewById(R.id.wifi_setup_cancel).setVisibility(View.VISIBLE);
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showConfigPreference(accessPoint, edit);
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} else {
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showDialog(accessPoint, edit);
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}
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}
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private void showConfigPreference(AccessPoint accessPoint, boolean edit) {
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// We don't want to show more than one WifiConfigPreference
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if (mConfigPreference != null) {
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mAccessPoints.removePreference(mConfigPreference);
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}
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mConfigPreference = new WifiConfigPreference(this, this, accessPoint, edit);
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toggleButtonsVisibility(false);
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updateAccessPoints();
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mScanner.pause();
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}
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private void toggleButtonsVisibility(boolean firstLayout) {
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final Activity activity = getActivity();
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if (firstLayout) {
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activity.findViewById(R.id.wifi_setup_add_network).setVisibility(View.VISIBLE);
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activity.findViewById(R.id.wifi_setup_refresh_list).setVisibility(View.VISIBLE);
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activity.findViewById(R.id.wifi_setup_skip_or_next).setVisibility(View.VISIBLE);
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activity.findViewById(R.id.wifi_setup_connect).setVisibility(View.GONE);
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activity.findViewById(R.id.wifi_setup_forget).setVisibility(View.GONE);
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activity.findViewById(R.id.wifi_setup_cancel).setVisibility(View.GONE);
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} else {
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activity.findViewById(R.id.wifi_setup_add_network).setVisibility(View.GONE);
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activity.findViewById(R.id.wifi_setup_refresh_list).setVisibility(View.GONE);
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activity.findViewById(R.id.wifi_setup_skip_or_next).setVisibility(View.GONE);
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// made visible from controller.
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}
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}
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private void showDialog(AccessPoint accessPoint, boolean edit) {
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if (mDialog != null) {
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mDialog.dismiss();
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}
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mDialog = new WifiDialog(getActivity(), this, accessPoint, edit);
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mDialog.show();
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}
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private boolean requireKeyStore(WifiConfiguration config) {
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if (WifiConfigController.requireKeyStore(config) &&
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KeyStore.getInstance().test() != KeyStore.NO_ERROR) {
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mKeyStoreNetworkId = config.networkId;
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Credentials.getInstance().unlock(getActivity());
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return true;
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}
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return false;
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}
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/**
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* Shows the latest access points available with supplimental information like
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* the strength of network and the security for it.
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*/
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private void updateAccessPoints() {
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synchronized (this) {
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if (mRefrainListUpdate) {
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return;
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}
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}
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if (mConfigPreference != null) {
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mAccessPoints.removeAll();
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final AccessPoint parent = mConfigPreference.getAccessPoint();
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if (parent != null) {
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parent.setSelectable(false);
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mAccessPoints.addPreference(parent);
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}
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mAccessPoints.addPreference(mConfigPreference);
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} else {
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// AccessPoints are automatically sorted with TreeSet.
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final Collection<AccessPoint> accessPoints = constructAccessPoints();
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mAccessPoints.removeAll();
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for (AccessPoint accessPoint : accessPoints) {
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mAccessPoints.addPreference(accessPoint);
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}
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}
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}
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private Collection<AccessPoint> constructAccessPoints() {
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Collection<AccessPoint> accessPoints =
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new TreeSet<AccessPoint>(new AccessPoint.Comparater());
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final List<WifiConfiguration> configs = mWifiManager.getConfiguredNetworks();
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if (configs != null) {
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for (WifiConfiguration config : configs) {
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AccessPoint accessPoint = new AccessPoint(getActivity(), config);
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accessPoint.update(mLastInfo, mLastState);
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accessPoints.add(accessPoint);
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}
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}
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final List<ScanResult> results = mWifiManager.getScanResults();
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if (results != null) {
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for (ScanResult result : results) {
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// Ignore hidden and ad-hoc networks.
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if (result.SSID == null || result.SSID.length() == 0 ||
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result.capabilities.contains("[IBSS]")) {
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continue;
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}
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boolean found = false;
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for (AccessPoint accessPoint : accessPoints) {
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if (accessPoint.update(result)) {
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found = true;
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}
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}
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if (!found) {
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accessPoints.add(new AccessPoint(getActivity(), result));
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}
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}
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}
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return accessPoints;
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}
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private void handleEvent(Intent intent) {
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String action = intent.getAction();
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if (WifiManager.WIFI_STATE_CHANGED_ACTION.equals(action)) {
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updateWifiState(intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE,
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WifiManager.WIFI_STATE_UNKNOWN));
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} else if (WifiManager.SCAN_RESULTS_AVAILABLE_ACTION.equals(action) ||
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WifiManager.SUPPLICANT_CONFIG_CHANGED_ACTION.equals(action)) {
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updateAccessPoints();
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} else if (WifiManager.SUPPLICANT_STATE_CHANGED_ACTION.equals(action)) {
|
|
updateConnectionState(WifiInfo.getDetailedStateOf((SupplicantState)
|
|
intent.getParcelableExtra(WifiManager.EXTRA_NEW_STATE)));
|
|
} else if (WifiManager.NETWORK_STATE_CHANGED_ACTION.equals(action)) {
|
|
NetworkInfo info = (NetworkInfo) intent.getParcelableExtra(
|
|
WifiManager.EXTRA_NETWORK_INFO);
|
|
changeNextButtonState(info.isConnected());
|
|
updateConnectionState(info.getDetailedState());
|
|
} else if (WifiManager.RSSI_CHANGED_ACTION.equals(action)) {
|
|
updateConnectionState(null);
|
|
}
|
|
}
|
|
|
|
private void updateConnectionState(DetailedState state) {
|
|
/* sticky broadcasts can call this when wifi is disabled */
|
|
if (!mWifiManager.isWifiEnabled()) {
|
|
mScanner.pause();
|
|
return;
|
|
}
|
|
|
|
if (state == DetailedState.OBTAINING_IPADDR) {
|
|
mScanner.pause();
|
|
} else {
|
|
mScanner.resume();
|
|
}
|
|
|
|
mLastInfo = mWifiManager.getConnectionInfo();
|
|
if (state != null) {
|
|
mLastState = state;
|
|
}
|
|
|
|
for (int i = mAccessPoints.getPreferenceCount() - 1; i >= 0; --i) {
|
|
// Maybe there's a WifiConfigPreference
|
|
Preference preference = mAccessPoints.getPreference(i);
|
|
if (preference instanceof AccessPoint) {
|
|
((AccessPoint) preference).update(mLastInfo, mLastState);
|
|
}
|
|
}
|
|
|
|
final Activity activity = getActivity();
|
|
if (activity instanceof WifiSettingsForSetupWizardXL) {
|
|
((WifiSettingsForSetupWizardXL)activity).updateConnectionState(mLastState);
|
|
}
|
|
}
|
|
|
|
private void updateWifiState(int state) {
|
|
if (state == WifiManager.WIFI_STATE_ENABLED) {
|
|
mScanner.resume();
|
|
} else {
|
|
mScanner.pause();
|
|
mAccessPoints.removeAll();
|
|
}
|
|
}
|
|
|
|
private class Scanner extends Handler {
|
|
private int mRetry = 0;
|
|
|
|
void resume() {
|
|
synchronized (WifiSettings.this) {
|
|
mRefrainListUpdate = false;
|
|
}
|
|
if (!hasMessages(0)) {
|
|
sendEmptyMessage(0);
|
|
}
|
|
}
|
|
|
|
void pause() {
|
|
mRetry = 0;
|
|
mAccessPoints.setProgress(false);
|
|
synchronized (WifiSettings.this) {
|
|
mRefrainListUpdate = true;
|
|
}
|
|
removeMessages(0);
|
|
}
|
|
|
|
@Override
|
|
public void handleMessage(Message message) {
|
|
if (mWifiManager.startScanActive()) {
|
|
mRetry = 0;
|
|
} else if (++mRetry >= 3) {
|
|
mRetry = 0;
|
|
Toast.makeText(getActivity(), R.string.wifi_fail_to_scan,
|
|
Toast.LENGTH_LONG).show();
|
|
return;
|
|
}
|
|
mAccessPoints.setProgress(mRetry != 0);
|
|
// Combo scans can take 5-6s to complete. Increase interval to 10s.
|
|
sendEmptyMessageDelayed(0, 10000);
|
|
}
|
|
}
|
|
|
|
private void changeNextButtonState(boolean wifiAvailable) {
|
|
if (mInXlSetupWizard) {
|
|
final Button button =
|
|
(Button)getActivity().findViewById(R.id.wifi_setup_skip_or_next);
|
|
button.setEnabled(true);
|
|
if (wifiAvailable) {
|
|
button.setText(R.string.wifi_setup_next);
|
|
} else {
|
|
button.setText(R.string.wifi_setup_skip);
|
|
}
|
|
} else if (mEnableNextOnConnection && hasNextButton()) {
|
|
// Assumes layout for phones has next button inside it.
|
|
getNextButton().setEnabled(wifiAvailable);
|
|
}
|
|
}
|
|
|
|
public void onClick(DialogInterface dialogInterface, int button) {
|
|
if (button == WifiDialog.BUTTON_FORGET && mSelectedAccessPoint != null) {
|
|
forget();
|
|
} else if (button == WifiDialog.BUTTON_SUBMIT) {
|
|
submit();
|
|
}
|
|
}
|
|
|
|
/* package */ void submit() {
|
|
final WifiConfigUiBase uiBase = (mDialog != null ? mDialog : mConfigPreference);
|
|
final WifiConfiguration config = uiBase.getController().getConfig();
|
|
|
|
if (config == null) {
|
|
if (mSelectedAccessPoint != null
|
|
&& !requireKeyStore(mSelectedAccessPoint.getConfig())) {
|
|
mWifiManager.connectNetwork(mSelectedAccessPoint.networkId);
|
|
}
|
|
} else if (config.networkId != -1) {
|
|
if (mSelectedAccessPoint != null) {
|
|
mWifiManager.saveNetwork(config);
|
|
}
|
|
} else {
|
|
if (uiBase.isEdit() || requireKeyStore(config)) {
|
|
mWifiManager.saveNetwork(config);
|
|
} else {
|
|
mWifiManager.connectNetwork(config);
|
|
}
|
|
}
|
|
|
|
detachConfigPreference();
|
|
}
|
|
|
|
/* package */ void forget() {
|
|
mWifiManager.forgetNetwork(mSelectedAccessPoint.networkId);
|
|
|
|
detachConfigPreference();
|
|
|
|
changeNextButtonState(false);
|
|
|
|
final Activity activity = getActivity();
|
|
if (activity instanceof WifiSettingsForSetupWizardXL) {
|
|
((WifiSettingsForSetupWizardXL)activity).onForget();
|
|
}
|
|
}
|
|
|
|
/* package */ void refreshAccessPoints() {
|
|
if (mWifiManager.isWifiEnabled()) {
|
|
mScanner.resume();
|
|
}
|
|
|
|
mConfigPreference = null;
|
|
mAccessPoints.removeAll();
|
|
|
|
final Activity activity = getActivity();
|
|
if (activity instanceof WifiSettingsForSetupWizardXL) {
|
|
((WifiSettingsForSetupWizardXL)activity).onRefreshAccessPoints();
|
|
}
|
|
}
|
|
|
|
/* package */ void detachConfigPreference() {
|
|
if (mConfigPreference != null) {
|
|
if (mWifiManager.isWifiEnabled()) {
|
|
mScanner.resume();
|
|
}
|
|
mAccessPoints.removePreference(mConfigPreference);
|
|
mConfigPreference = null;
|
|
updateAccessPoints();
|
|
toggleButtonsVisibility(true);
|
|
}
|
|
}
|
|
|
|
/* package */ void onAddNetworkPressed() {
|
|
mSelectedAccessPoint = null;
|
|
showConfigUi(null, true);
|
|
}
|
|
|
|
/* package */ int getAccessPointsCount() {
|
|
if (mAccessPoints != null) {
|
|
return mAccessPoints.getPreferenceCount();
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
}
|