Move Settings wifi tracking to SettingsLib

Make SettingsLib capable of tracking which wifi networks are
available/saved and their state.

Also modify Quick Settings to use this code rather than having
its own logic.

Bug: 19180466
Change-Id: Iff9f9aed240d79323dba41496496e8076b9fa6f2

4 files changed, 1241 insertions, 0 deletions

diff --git a/packages/SettingsLib/src/com/android/settingslib/Blank.java b/packages/SettingsLib/src/com/android/settingslib/Blank.java
deleted file mode 100644
index e69de29..0000000
--- a/packages/SettingsLib/src/com/android/settingslib/Blank.java
+++ /dev/null
diff --git a/packages/SettingsLib/src/com/android/settingslib/WirelessUtils.java b/packages/SettingsLib/src/com/android/settingslib/WirelessUtils.java
new file mode 100644
index 0000000..0346a77
--- /dev/null
+++ b/packages/SettingsLib/src/com/android/settingslib/WirelessUtils.java
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2015 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.settingslib;
+
+import android.content.Context;
+import android.provider.Settings;
+
+public class WirelessUtils {
+
+    public static boolean isRadioAllowed(Context context, String type) {
+        if (!isAirplaneModeOn(context)) {
+            return true;
+        }
+        String toggleable = Settings.Global.getString(context.getContentResolver(),
+                Settings.Global.AIRPLANE_MODE_TOGGLEABLE_RADIOS);
+        return toggleable != null && toggleable.contains(type);
+    }
+
+    public static boolean isAirplaneModeOn(Context context) {
+        return Settings.Global.getInt(context.getContentResolver(),
+                Settings.Global.AIRPLANE_MODE_ON, 0) != 0;
+    }
+
+}
diff --git a/packages/SettingsLib/src/com/android/settingslib/wifi/AccessPoint.java b/packages/SettingsLib/src/com/android/settingslib/wifi/AccessPoint.java
new file mode 100644
index 0000000..e8ab220
--- /dev/null
+++ b/packages/SettingsLib/src/com/android/settingslib/wifi/AccessPoint.java
@@ -0,0 +1,739 @@
+/*
+ * Copyright (C) 2015 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.settingslib.wifi;
+
+import android.content.Context;
+import android.net.NetworkInfo;
+import android.net.NetworkInfo.DetailedState;
+import android.net.NetworkInfo.State;
+import android.net.wifi.ScanResult;
+import android.net.wifi.WifiConfiguration;
+import android.net.wifi.WifiConfiguration.KeyMgmt;
+import android.net.wifi.WifiInfo;
+import android.net.wifi.WifiManager;
+import android.os.Bundle;
+import android.util.Log;
+import android.util.LruCache;
+
+import com.android.settingslib.R;
+
+import java.util.Map;
+
+
+public class AccessPoint implements Comparable<AccessPoint> {
+    static final String TAG = "SettingsLib.AccessPoint";
+
+    /**
+     * Lower bound on the 2.4 GHz (802.11b/g/n) WLAN channels
+     */
+    public static final int LOWER_FREQ_24GHZ = 2400;
+
+    /**
+     * Upper bound on the 2.4 GHz (802.11b/g/n) WLAN channels
+     */
+    public static final int HIGHER_FREQ_24GHZ = 2500;
+
+    /**
+     * Lower bound on the 5.0 GHz (802.11a/h/j/n/ac) WLAN channels
+     */
+    public static final int LOWER_FREQ_5GHZ = 4900;
+
+    /**
+     * Upper bound on the 5.0 GHz (802.11a/h/j/n/ac) WLAN channels
+     */
+    public static final int HIGHER_FREQ_5GHZ = 5900;
+
+
+    /**
+     * Experimental: we should be able to show the user the list of BSSIDs and bands
+     *  for that SSID.
+     *  For now this data is used only with Verbose Logging so as to show the band and number
+     *  of BSSIDs on which that network is seen.
+     */
+    public LruCache<String, ScanResult> mScanResultCache;
+    private static final String KEY_NETWORKINFO = "key_networkinfo";
+    private static final String KEY_WIFIINFO = "key_wifiinfo";
+    private static final String KEY_SCANRESULT = "key_scanresult";
+    private static final String KEY_CONFIG = "key_config";
+
+    /**
+     * These values are matched in string arrays -- changes must be kept in sync
+     */
+    public static final int SECURITY_NONE = 0;
+    public static final int SECURITY_WEP = 1;
+    public static final int SECURITY_PSK = 2;
+    public static final int SECURITY_EAP = 3;
+
+    private static final int PSK_UNKNOWN = 0;
+    private static final int PSK_WPA = 1;
+    private static final int PSK_WPA2 = 2;
+    private static final int PSK_WPA_WPA2 = 3;
+
+    private static final int VISIBILITY_OUTDATED_AGE_IN_MILLI = 20000;
+    private final Context mContext;
+
+    private String ssid;
+    private int security;
+    private int networkId = WifiConfiguration.INVALID_NETWORK_ID;
+
+    private int pskType = PSK_UNKNOWN;
+
+    private WifiConfiguration mConfig;
+    private ScanResult mScanResult;
+
+    private int mRssi = Integer.MAX_VALUE;
+    private long mSeen = 0;
+
+    private WifiInfo mInfo;
+    private NetworkInfo mNetworkInfo;
+    private AccessPointListener mAccessPointListener;
+
+    private Object mTag;
+
+    public AccessPoint(Context context, Bundle savedState) {
+        mContext = context;
+        mConfig = savedState.getParcelable(KEY_CONFIG);
+        if (mConfig != null) {
+            loadConfig(mConfig);
+        }
+        mScanResult = (ScanResult) savedState.getParcelable(KEY_SCANRESULT);
+        if (mScanResult != null) {
+            loadResult(mScanResult);
+        }
+        mInfo = (WifiInfo) savedState.getParcelable(KEY_WIFIINFO);
+        if (savedState.containsKey(KEY_NETWORKINFO)) {
+            mNetworkInfo = savedState.getParcelable(KEY_NETWORKINFO);
+        }
+        update(mInfo, mNetworkInfo);
+    }
+
+    AccessPoint(Context context, ScanResult result) {
+        mContext = context;
+        loadResult(result);
+    }
+
+    AccessPoint(Context context, WifiConfiguration config) {
+        mContext = context;
+        loadConfig(config);
+    }
+
+    @Override
+    public int compareTo(AccessPoint other) {
+        // Active one goes first.
+        if (isActive() && !other.isActive()) return -1;
+        if (!isActive() && other.isActive()) return 1;
+
+        // Reachable one goes before unreachable one.
+        if (mRssi != Integer.MAX_VALUE && other.mRssi == Integer.MAX_VALUE) return -1;
+        if (mRssi == Integer.MAX_VALUE && other.mRssi != Integer.MAX_VALUE) return 1;
+
+        // Configured one goes before unconfigured one.
+        if (networkId != WifiConfiguration.INVALID_NETWORK_ID
+                && other.networkId == WifiConfiguration.INVALID_NETWORK_ID) return -1;
+        if (networkId == WifiConfiguration.INVALID_NETWORK_ID
+                && other.networkId != WifiConfiguration.INVALID_NETWORK_ID) return 1;
+
+        // Sort by signal strength.
+        int difference = WifiManager.compareSignalLevel(other.mRssi, mRssi);
+        if (difference != 0) {
+            return difference;
+        }
+        // Sort by ssid.
+        return ssid.compareToIgnoreCase(other.ssid);
+    }
+
+    @Override
+    public boolean equals(Object other) {
+        if (!(other instanceof AccessPoint)) return false;
+        return (this.compareTo((AccessPoint) other) == 0);
+    }
+
+    @Override
+    public int hashCode() {
+        int result = 0;
+        if (mInfo != null) result += 13 * mInfo.hashCode();
+        result += 19 * mRssi;
+        result += 23 * networkId;
+        result += 29 * ssid.hashCode();
+        return result;
+    }
+
+    @Override
+    public String toString() {
+        StringBuilder builder = new StringBuilder().append("AccessPoint(")
+                .append(ssid);
+        if (isSaved()) {
+            builder.append(',').append("saved");
+        }
+        if (isActive()) {
+            builder.append(',').append("active");
+        }
+        if (isEphemeral()) {
+            builder.append(',').append("ephemeral");
+        }
+        if (isConnectable()) {
+            builder.append(',').append("connectable");
+        }
+        if (security != SECURITY_NONE) {
+            builder.append(',').append(securityToString(security, pskType));
+        }
+        return builder.append(')').toString();
+    }
+
+    public boolean matches(ScanResult result) {
+        return ssid.equals(result.SSID) && security == getSecurity(result);
+    }
+
+    public boolean matches(WifiConfiguration config) {
+        return ssid.equals(removeDoubleQuotes(config.SSID)) && security == getSecurity(config);
+    }
+
+    public WifiConfiguration getConfig() {
+        return mConfig;
+    }
+
+    public void clearConfig() {
+        mConfig = null;
+        networkId = WifiConfiguration.INVALID_NETWORK_ID;
+    }
+
+    public WifiInfo getInfo() {
+        return mInfo;
+    }
+
+    public int getLevel() {
+        if (mRssi == Integer.MAX_VALUE) {
+            return -1;
+        }
+        return WifiManager.calculateSignalLevel(mRssi, 4);
+    }
+
+    public NetworkInfo getNetworkInfo() {
+        return mNetworkInfo;
+    }
+
+    public int getSecurity() {
+        return security;
+    }
+
+    public String getSecurityString(boolean concise) {
+        Context context = mContext;
+        switch(security) {
+            case SECURITY_EAP:
+                return concise ? context.getString(R.string.wifi_security_short_eap) :
+                    context.getString(R.string.wifi_security_eap);
+            case SECURITY_PSK:
+                switch (pskType) {
+                    case PSK_WPA:
+                        return concise ? context.getString(R.string.wifi_security_short_wpa) :
+                            context.getString(R.string.wifi_security_wpa);
+                    case PSK_WPA2:
+                        return concise ? context.getString(R.string.wifi_security_short_wpa2) :
+                            context.getString(R.string.wifi_security_wpa2);
+                    case PSK_WPA_WPA2:
+                        return concise ? context.getString(R.string.wifi_security_short_wpa_wpa2) :
+                            context.getString(R.string.wifi_security_wpa_wpa2);
+                    case PSK_UNKNOWN:
+                    default:
+                        return concise ? context.getString(R.string.wifi_security_short_psk_generic)
+                                : context.getString(R.string.wifi_security_psk_generic);
+                }
+            case SECURITY_WEP:
+                return concise ? context.getString(R.string.wifi_security_short_wep) :
+                    context.getString(R.string.wifi_security_wep);
+            case SECURITY_NONE:
+            default:
+                return concise ? "" : context.getString(R.string.wifi_security_none);
+        }
+    }
+
+    public String getSsid() {
+        return ssid;
+    }
+
+    public DetailedState getDetailedState() {
+        return mNetworkInfo != null ? mNetworkInfo.getDetailedState() : null;
+    }
+
+    public String getSummary() {
+        // Update to new summary
+        StringBuilder summary = new StringBuilder();
+
+        if (isActive()) { // This is the active connection
+            summary.append(getSummary(mContext, getDetailedState(),
+                    networkId == WifiConfiguration.INVALID_NETWORK_ID));
+        } else if (mConfig != null
+                && mConfig.hasNoInternetAccess()) {
+            summary.append(mContext.getString(R.string.wifi_no_internet));
+        } else if (mConfig != null && ((mConfig.status == WifiConfiguration.Status.DISABLED &&
+                mConfig.disableReason != WifiConfiguration.DISABLED_UNKNOWN_REASON)
+               || mConfig.autoJoinStatus
+                >= WifiConfiguration.AUTO_JOIN_DISABLED_ON_AUTH_FAILURE)) {
+            if (mConfig.autoJoinStatus
+                    >= WifiConfiguration.AUTO_JOIN_DISABLED_ON_AUTH_FAILURE) {
+                if (mConfig.disableReason == WifiConfiguration.DISABLED_DHCP_FAILURE) {
+                    summary.append(mContext.getString(R.string.wifi_disabled_network_failure));
+                } else if (mConfig.disableReason == WifiConfiguration.DISABLED_AUTH_FAILURE) {
+                    summary.append(mContext.getString(R.string.wifi_disabled_password_failure));
+                } else {
+                    summary.append(mContext.getString(R.string.wifi_disabled_wifi_failure));
+                }
+            } else {
+                switch (mConfig.disableReason) {
+                    case WifiConfiguration.DISABLED_AUTH_FAILURE:
+                        summary.append(mContext.getString(R.string.wifi_disabled_password_failure));
+                        break;
+                    case WifiConfiguration.DISABLED_DHCP_FAILURE:
+                    case WifiConfiguration.DISABLED_DNS_FAILURE:
+                        summary.append(mContext.getString(R.string.wifi_disabled_network_failure));
+                        break;
+                    case WifiConfiguration.DISABLED_UNKNOWN_REASON:
+                    case WifiConfiguration.DISABLED_ASSOCIATION_REJECT:
+                        summary.append(mContext.getString(R.string.wifi_disabled_generic));
+                        break;
+                }
+            }
+        } else if (mRssi == Integer.MAX_VALUE) { // Wifi out of range
+            summary.append(mContext.getString(R.string.wifi_not_in_range));
+        } else { // In range, not disabled.
+            if (mConfig != null) { // Is saved network
+                summary.append(mContext.getString(R.string.wifi_remembered));
+            }
+        }
+
+        if (WifiTracker.sVerboseLogging > 0) {
+            // Add RSSI/band information for this config, what was seen up to 6 seconds ago
+            // verbose WiFi Logging is only turned on thru developers settings
+            if (mInfo != null && mNetworkInfo != null) { // This is the active connection
+                summary.append(" f=" + Integer.toString(mInfo.getFrequency()));
+            }
+            summary.append(" " + getVisibilityStatus());
+            if (mConfig != null && mConfig.autoJoinStatus > 0) {
+                summary.append(" (" + mConfig.autoJoinStatus);
+                if (mConfig.blackListTimestamp > 0) {
+                    long now = System.currentTimeMillis();
+                    long diff = (now - mConfig.blackListTimestamp)/1000;
+                    long sec = diff%60; //seconds
+                    long min = (diff/60)%60; //minutes
+                    long hour = (min/60)%60; //hours
+                    summary.append(", ");
+                    if (hour > 0) summary.append(Long.toString(hour) + "h ");
+                    summary.append( Long.toString(min) + "m ");
+                    summary.append( Long.toString(sec) + "s ");
+                }
+                summary.append(")");
+            }
+            if (mConfig != null && mConfig.numIpConfigFailures > 0) {
+                summary.append(" ipf=").append(mConfig.numIpConfigFailures);
+            }
+            if (mConfig != null && mConfig.numConnectionFailures > 0) {
+                summary.append(" cf=").append(mConfig.numConnectionFailures);
+            }
+            if (mConfig != null && mConfig.numAuthFailures > 0) {
+                summary.append(" authf=").append(mConfig.numAuthFailures);
+            }
+            if (mConfig != null && mConfig.numNoInternetAccessReports > 0) {
+                summary.append(" noInt=").append(mConfig.numNoInternetAccessReports);
+            }
+        }
+        return summary.toString();
+    }
+
+    /**
+     * Returns the visibility status of the WifiConfiguration.
+     *
+     * @return autojoin debugging information
+     * TODO: use a string formatter
+     * ["rssi 5Ghz", "num results on 5GHz" / "rssi 5Ghz", "num results on 5GHz"]
+     * For instance [-40,5/-30,2]
+     */
+    private String getVisibilityStatus() {
+        StringBuilder visibility = new StringBuilder();
+        StringBuilder scans24GHz = null;
+        StringBuilder scans5GHz = null;
+        String bssid = null;
+
+        long now = System.currentTimeMillis();
+
+        if (mInfo != null) {
+            bssid = mInfo.getBSSID();
+            if (bssid != null) {
+                visibility.append(" ").append(bssid);
+            }
+            visibility.append(" rssi=").append(mInfo.getRssi());
+            visibility.append(" ");
+            visibility.append(" score=").append(mInfo.score);
+            visibility.append(String.format(" tx=%.1f,", mInfo.txSuccessRate));
+            visibility.append(String.format("%.1f,", mInfo.txRetriesRate));
+            visibility.append(String.format("%.1f ", mInfo.txBadRate));
+            visibility.append(String.format("rx=%.1f", mInfo.rxSuccessRate));
+        }
+
+        if (mScanResultCache != null) {
+            int rssi5 = WifiConfiguration.INVALID_RSSI;
+            int rssi24 = WifiConfiguration.INVALID_RSSI;
+            int num5 = 0;
+            int num24 = 0;
+            int numBlackListed = 0;
+            int n24 = 0; // Number scan results we included in the string
+            int n5 = 0; // Number scan results we included in the string
+            Map<String, ScanResult> list = mScanResultCache.snapshot();
+            // TODO: sort list by RSSI or age
+            for (ScanResult result : list.values()) {
+                if (result.seen == 0)
+                    continue;
+
+                if (result.autoJoinStatus != ScanResult.ENABLED) numBlackListed++;
+
+                if (result.frequency >= LOWER_FREQ_5GHZ
+                        && result.frequency <= HIGHER_FREQ_5GHZ) {
+                    // Strictly speaking: [4915, 5825]
+                    // number of known BSSID on 5GHz band
+                    num5 = num5 + 1;
+                } else if (result.frequency >= LOWER_FREQ_24GHZ
+                        && result.frequency <= HIGHER_FREQ_24GHZ) {
+                    // Strictly speaking: [2412, 2482]
+                    // number of known BSSID on 2.4Ghz band
+                    num24 = num24 + 1;
+                }
+
+                // Ignore results seen, older than 20 seconds
+                if (now - result.seen > VISIBILITY_OUTDATED_AGE_IN_MILLI) continue;
+
+                if (result.frequency >= LOWER_FREQ_5GHZ
+                        && result.frequency <= HIGHER_FREQ_5GHZ) {
+                    if (result.level > rssi5) {
+                        rssi5 = result.level;
+                    }
+                    if (n5 < 4) {
+                        if (scans5GHz == null) scans5GHz = new StringBuilder();
+                        scans5GHz.append(" \n{").append(result.BSSID);
+                        if (bssid != null && result.BSSID.equals(bssid)) scans5GHz.append("*");
+                        scans5GHz.append("=").append(result.frequency);
+                        scans5GHz.append(",").append(result.level);
+                        if (result.autoJoinStatus != 0) {
+                            scans5GHz.append(",st=").append(result.autoJoinStatus);
+                        }
+                        if (result.numIpConfigFailures != 0) {
+                            scans5GHz.append(",ipf=").append(result.numIpConfigFailures);
+                        }
+                        scans5GHz.append("}");
+                        n5++;
+                    }
+                } else if (result.frequency >= LOWER_FREQ_24GHZ
+                        && result.frequency <= HIGHER_FREQ_24GHZ) {
+                    if (result.level > rssi24) {
+                        rssi24 = result.level;
+                    }
+                    if (n24 < 4) {
+                        if (scans24GHz == null) scans24GHz = new StringBuilder();
+                        scans24GHz.append(" \n{").append(result.BSSID);
+                        if (bssid != null && result.BSSID.equals(bssid)) scans24GHz.append("*");
+                        scans24GHz.append("=").append(result.frequency);
+                        scans24GHz.append(",").append(result.level);
+                        if (result.autoJoinStatus != 0) {
+                            scans24GHz.append(",st=").append(result.autoJoinStatus);
+                        }
+                        if (result.numIpConfigFailures != 0) {
+                            scans24GHz.append(",ipf=").append(result.numIpConfigFailures);
+                        }
+                        scans24GHz.append("}");
+                        n24++;
+                    }
+                }
+            }
+            visibility.append(" [");
+            if (num24 > 0) {
+                visibility.append("(").append(num24).append(")");
+                if (n24 <= 4) {
+                    if (scans24GHz != null) {
+                        visibility.append(scans24GHz.toString());
+                    }
+                } else {
+                    visibility.append("max=").append(rssi24);
+                    if (scans24GHz != null) {
+                        visibility.append(",").append(scans24GHz.toString());
+                    }
+                }
+            }
+            visibility.append(";");
+            if (num5 > 0) {
+                visibility.append("(").append(num5).append(")");
+                if (n5 <= 4) {
+                    if (scans5GHz != null) {
+                        visibility.append(scans5GHz.toString());
+                    }
+                } else {
+                    visibility.append("max=").append(rssi5);
+                    if (scans5GHz != null) {
+                        visibility.append(",").append(scans5GHz.toString());
+                    }
+                }
+            }
+            if (numBlackListed > 0)
+                visibility.append("!").append(numBlackListed);
+            visibility.append("]");
+        } else {
+            if (mRssi != Integer.MAX_VALUE) {
+                visibility.append(" rssi=");
+                visibility.append(mRssi);
+                if (mScanResult != null) {
+                    visibility.append(", f=");
+                    visibility.append(mScanResult.frequency);
+                }
+            }
+        }
+
+        return visibility.toString();
+    }
+
+    /**
+     * Return whether this is the active connection.
+     * For ephemeral connections (networkId is invalid), this returns false if the network is
+     * disconnected.
+     */
+    public boolean isActive() {
+        return mNetworkInfo != null &&
+                (networkId != WifiConfiguration.INVALID_NETWORK_ID ||
+                 mNetworkInfo.getState() != State.DISCONNECTED);
+    }
+
+    public boolean isConnectable() {
+        return getLevel() != -1 && getDetailedState() == null;
+    }
+
+    public boolean isEphemeral() {
+        return !isSaved() && mNetworkInfo != null && mNetworkInfo.getState() != State.DISCONNECTED;
+    }
+
+    /** Return whether the given {@link WifiInfo} is for this access point. */
+    private boolean isInfoForThisAccessPoint(WifiInfo info) {
+        if (networkId != WifiConfiguration.INVALID_NETWORK_ID) {
+            return networkId == info.getNetworkId();
+        } else {
+            // Might be an ephemeral connection with no WifiConfiguration. Try matching on SSID.
+            // (Note that we only do this if the WifiConfiguration explicitly equals INVALID).
+            // TODO: Handle hex string SSIDs.
+            return ssid.equals(removeDoubleQuotes(info.getSSID()));
+        }
+    }
+
+    public boolean isSaved() {
+        return networkId != WifiConfiguration.INVALID_NETWORK_ID;
+    }
+
+    public Object getTag() {
+        return mTag;
+    }
+
+    public void setTag(Object tag) {
+        mTag = tag;
+    }
+
+    /**
+     * Generate and save a default wifiConfiguration with common values.
+     * Can only be called for unsecured networks.
+     */
+    public void generateOpenNetworkConfig() {
+        if (security != SECURITY_NONE)
+            throw new IllegalStateException();
+        if (mConfig != null)
+            return;
+        mConfig = new WifiConfiguration();
+        mConfig.SSID = AccessPoint.convertToQuotedString(ssid);
+        mConfig.allowedKeyManagement.set(KeyMgmt.NONE);
+    }
+
+    void loadConfig(WifiConfiguration config) {
+        ssid = (config.SSID == null ? "" : removeDoubleQuotes(config.SSID));
+        security = getSecurity(config);
+        networkId = config.networkId;
+        mConfig = config;
+    }
+
+    private void loadResult(ScanResult result) {
+        ssid = result.SSID;
+        security = getSecurity(result);
+        if (security == SECURITY_PSK)
+            pskType = getPskType(result);
+        mRssi = result.level;
+        mScanResult = result;
+        if (result.seen > mSeen) {
+            mSeen = result.seen;
+        }
+    }
+
+    public void saveWifiState(Bundle savedState) {
+        savedState.putParcelable(KEY_CONFIG, mConfig);
+        savedState.putParcelable(KEY_SCANRESULT, mScanResult);
+        savedState.putParcelable(KEY_WIFIINFO, mInfo);
+        if (mNetworkInfo != null) {
+            savedState.putParcelable(KEY_NETWORKINFO, mNetworkInfo);
+        }
+    }
+
+    public void setListener(AccessPointListener listener) {
+        mAccessPointListener = listener;
+    }
+
+    boolean update(ScanResult result) {
+        if (result.seen > mSeen) {
+            mSeen = result.seen;
+        }
+        if (WifiTracker.sVerboseLogging > 0) {
+            if (mScanResultCache == null) {
+                mScanResultCache = new LruCache<String, ScanResult>(32);
+            }
+            mScanResultCache.put(result.BSSID, result);
+        }
+
+        if (ssid.equals(result.SSID) && security == getSecurity(result)) {
+            if (WifiManager.compareSignalLevel(result.level, mRssi) > 0) {
+                int oldLevel = getLevel();
+                mRssi = result.level;
+                if (getLevel() != oldLevel && mAccessPointListener != null) {
+                    mAccessPointListener.onLevelChanged(this);
+                }
+            }
+            // This flag only comes from scans, is not easily saved in config
+            if (security == SECURITY_PSK) {
+                pskType = getPskType(result);
+            }
+            mScanResult = result;
+            if (mAccessPointListener != null) {
+                mAccessPointListener.onAccessPointChanged(this);
+            }
+            return true;
+        }
+        return false;
+    }
+
+    boolean update(WifiInfo info, NetworkInfo networkInfo) {
+        boolean reorder = false;
+        if (info != null && isInfoForThisAccessPoint(info)) {
+            reorder = (mInfo == null);
+            mRssi = info.getRssi();
+            mInfo = info;
+            mNetworkInfo = networkInfo;
+            if (mAccessPointListener != null) {
+                mAccessPointListener.onAccessPointChanged(this);
+            }
+        } else if (mInfo != null) {
+            reorder = true;
+            mInfo = null;
+            mNetworkInfo = null;
+            if (mAccessPointListener != null) {
+                mAccessPointListener.onAccessPointChanged(this);
+            }
+        }
+        return reorder;
+    }
+
+    public static String getSummary(Context context, String ssid, DetailedState state,
+            boolean isEphemeral) {
+        if (state == DetailedState.CONNECTED && isEphemeral && ssid == null) {
+            // Special case for connected + ephemeral networks.
+            return context.getString(R.string.connected_via_wfa);
+        }
+
+        String[] formats = context.getResources().getStringArray((ssid == null)
+                ? R.array.wifi_status : R.array.wifi_status_with_ssid);
+        int index = state.ordinal();
+
+        if (index >= formats.length || formats[index].length() == 0) {
+            return null;
+        }
+        return String.format(formats[index], ssid);
+    }
+
+    public static String getSummary(Context context, DetailedState state, boolean isEphemeral) {
+        return getSummary(context, null, state, isEphemeral);
+    }
+
+    public static String convertToQuotedString(String string) {
+        return "\"" + string + "\"";
+    }
+
+    private static int getPskType(ScanResult result) {
+        boolean wpa = result.capabilities.contains("WPA-PSK");
+        boolean wpa2 = result.capabilities.contains("WPA2-PSK");
+        if (wpa2 && wpa) {
+            return PSK_WPA_WPA2;
+        } else if (wpa2) {
+            return PSK_WPA2;
+        } else if (wpa) {
+            return PSK_WPA;
+        } else {
+            Log.w(TAG, "Received abnormal flag string: " + result.capabilities);
+            return PSK_UNKNOWN;
+        }
+    }
+
+    private static int getSecurity(ScanResult result) {
+        if (result.capabilities.contains("WEP")) {
+            return SECURITY_WEP;
+        } else if (result.capabilities.contains("PSK")) {
+            return SECURITY_PSK;
+        } else if (result.capabilities.contains("EAP")) {
+            return SECURITY_EAP;
+        }
+        return SECURITY_NONE;
+    }
+
+    static int getSecurity(WifiConfiguration config) {
+        if (config.allowedKeyManagement.get(KeyMgmt.WPA_PSK)) {
+            return SECURITY_PSK;
+        }
+        if (config.allowedKeyManagement.get(KeyMgmt.WPA_EAP) ||
+                config.allowedKeyManagement.get(KeyMgmt.IEEE8021X)) {
+            return SECURITY_EAP;
+        }
+        return (config.wepKeys[0] != null) ? SECURITY_WEP : SECURITY_NONE;
+    }
+
+    public static String securityToString(int security, int pskType) {
+        if (security == SECURITY_WEP) {
+            return "WEP";
+        } else if (security == SECURITY_PSK) {
+            if (pskType == PSK_WPA) {
+                return "WPA";
+            } else if (pskType == PSK_WPA2) {
+                return "WPA2";
+            } else if (pskType == PSK_WPA_WPA2) {
+                return "WPA_WPA2";
+            }
+            return "PSK";
+        } else if (security == SECURITY_EAP) {
+            return "EAP";
+        }
+        return "NONE";
+    }
+
+    static String removeDoubleQuotes(String string) {
+        int length = string.length();
+        if ((length > 1) && (string.charAt(0) == '"')
+                && (string.charAt(length - 1) == '"')) {
+            return string.substring(1, length - 1);
+        }
+        return string;
+    }
+
+    public interface AccessPointListener {
+        void onAccessPointChanged(AccessPoint accessPoint);
+        void onLevelChanged(AccessPoint accessPoint);
+    }
+}
diff --git a/packages/SettingsLib/src/com/android/settingslib/wifi/WifiTracker.java b/packages/SettingsLib/src/com/android/settingslib/wifi/WifiTracker.java
new file mode 100644
index 0000000..c3e23d2
--- /dev/null
+++ b/packages/SettingsLib/src/com/android/settingslib/wifi/WifiTracker.java
@@ -0,0 +1,465 @@
+/*
+ * Copyright (C) 2015 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.settingslib.wifi;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.net.NetworkInfo;
+import android.net.NetworkInfo.DetailedState;
+import android.net.wifi.ScanResult;
+import android.net.wifi.WifiConfiguration;
+import android.net.wifi.WifiInfo;
+import android.net.wifi.WifiManager;
+import android.os.Handler;
+import android.os.Message;
+import android.widget.Toast;
+
+import com.android.internal.annotations.VisibleForTesting;
+import com.android.settingslib.R;
+
+import java.io.PrintWriter;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+/**
+ * Tracks saved or available wifi networks and their state.
+ */
+public class WifiTracker {
+    private static final String TAG = "WifiTracker";
+
+    /** verbose logging flag. this flag is set thru developer debugging options
+     * and used so as to assist with in-the-field WiFi connectivity debugging  */
+    public static int sVerboseLogging = 0;
+
+    // TODO: Allow control of this?
+    // Combo scans can take 5-6s to complete - set to 10s.
+    private static final int WIFI_RESCAN_INTERVAL_MS = 10 * 1000;
+
+    private final Context mContext;
+    private final WifiManager mWifiManager;
+    private final IntentFilter mFilter;
+
+    private final AtomicBoolean mConnected = new AtomicBoolean(false);
+    private final WifiListener mListener;
+    private final boolean mIncludeSaved;
+    private final boolean mIncludeScans;
+
+    private boolean mSavedNetworksExist;
+    private boolean mRegistered;
+    private ArrayList<AccessPoint> mAccessPoints = new ArrayList<>();
+    private ArrayList<AccessPoint> mCachedAccessPoints = new ArrayList<>();
+
+    private NetworkInfo mLastNetworkInfo;
+    private WifiInfo mLastInfo;
+
+    @VisibleForTesting
+    Scanner mScanner;
+
+    public WifiTracker(Context context, WifiListener wifiListener, boolean includeSaved,
+            boolean includeScans) {
+        this(context, wifiListener, includeSaved, includeScans,
+                (WifiManager) context.getSystemService(Context.WIFI_SERVICE));
+    }
+
+    @VisibleForTesting
+    WifiTracker(Context context, WifiListener wifiListener, boolean includeSaved,
+            boolean includeScans, WifiManager wifiManager) {
+        if (!includeSaved && !includeScans) {
+            throw new IllegalArgumentException("Must include either saved or scans");
+        }
+        mContext = context;
+        mWifiManager = wifiManager;
+        mIncludeSaved = includeSaved;
+        mIncludeScans = includeScans;
+        mListener = wifiListener;
+
+        // check if verbose logging has been turned on or off
+        sVerboseLogging = mWifiManager.getVerboseLoggingLevel();
+
+        mFilter = new IntentFilter();
+        mFilter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION);
+        mFilter.addAction(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION);
+        mFilter.addAction(WifiManager.NETWORK_IDS_CHANGED_ACTION);
+        mFilter.addAction(WifiManager.SUPPLICANT_STATE_CHANGED_ACTION);
+        mFilter.addAction(WifiManager.CONFIGURED_NETWORKS_CHANGED_ACTION);
+        mFilter.addAction(WifiManager.LINK_CONFIGURATION_CHANGED_ACTION);
+        mFilter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);
+        mFilter.addAction(WifiManager.RSSI_CHANGED_ACTION);
+    }
+
+    /**
+     * Forces an update of the wifi networks when not scanning.
+     */
+    public void forceUpdate() {
+        updateAccessPoints();
+    }
+
+    /**
+     * Force a scan for wifi networks to happen now.
+     */
+    public void forceScan() {
+        if (mWifiManager.isWifiEnabled() && mScanner != null) {
+            mScanner.forceScan();
+        }
+    }
+
+    /**
+     * Temporarily stop scanning for wifi networks.
+     */
+    public void pauseScanning() {
+        if (mScanner != null) {
+            mScanner.pause();
+        }
+    }
+
+    /**
+     * Resume scanning for wifi networks after it has been paused.
+     */
+    public void resumeScanning() {
+        if (mWifiManager.isWifiEnabled()) {
+            if (mScanner == null) {
+                mScanner = new Scanner();
+            }
+            mScanner.resume();
+        }
+        updateAccessPoints();
+    }
+
+    /**
+     * Start tracking wifi networks.
+     * Registers listeners and starts scanning for wifi networks. If this is not called
+     * then forceUpdate() must be called to populate getAccessPoints().
+     */
+    public void startTracking() {
+        resumeScanning();
+        if (!mRegistered) {
+            mContext.registerReceiver(mReceiver, mFilter);
+            mRegistered = true;
+        }
+    }
+
+    /**
+     * Stop tracking wifi networks.
+     * Unregisters all listeners and stops scanning for wifi networks. This should always
+     * be called when done with a WifiTracker (if startTracking was called) to ensure
+     * proper cleanup.
+     */
+    public void stopTracking() {
+        if (mRegistered) {
+            mContext.unregisterReceiver(mReceiver);
+            mRegistered = false;
+        }
+        pauseScanning();
+    }
+
+    /**
+     * Gets the current list of access points.
+     */
+    public List<AccessPoint> getAccessPoints() {
+        return mAccessPoints;
+    }
+
+    public WifiManager getManager() {
+        return mWifiManager;
+    }
+
+    public boolean isWifiEnabled() {
+        return mWifiManager.isWifiEnabled();
+    }
+
+    /**
+     * @return true when there are saved networks on the device, regardless
+     * of whether the WifiTracker is tracking saved networks.
+     */
+    public boolean doSavedNetworksExist() {
+        return mSavedNetworksExist;
+    }
+
+    public boolean isConnected() {
+        return mConnected.get();
+    }
+
+    public void dump(PrintWriter pw) {
+        pw.println("  - wifi tracker ------");
+        for (AccessPoint accessPoint : mAccessPoints) {
+            pw.println("  " + accessPoint);
+        }
+    }
+
+    private void updateAccessPoints() {
+        // Swap the current access points into a cached list.
+        ArrayList<AccessPoint> tmpSwp = mAccessPoints;
+        mAccessPoints = mCachedAccessPoints;
+        mCachedAccessPoints = tmpSwp;
+        // Clear out the configs so we don't think something is saved when it isn't.
+        for (AccessPoint accessPoint : mCachedAccessPoints) {
+            accessPoint.clearConfig();
+        }
+
+        mAccessPoints.clear();
+
+        /** Lookup table to more quickly update AccessPoints by only considering objects with the
+         * correct SSID.  Maps SSID -> List of AccessPoints with the given SSID.  */
+        Multimap<String, AccessPoint> apMap = new Multimap<String, AccessPoint>();
+
+        final List<WifiConfiguration> configs = mWifiManager.getConfiguredNetworks();
+        if (configs != null) {
+            mSavedNetworksExist = configs.size() != 0;
+            for (WifiConfiguration config : configs) {
+                if (config.selfAdded && config.numAssociation == 0) {
+                    continue;
+                }
+                AccessPoint accessPoint = getCachedOrCreate(config);
+                if (mLastInfo != null && mLastNetworkInfo != null) {
+                    accessPoint.update(mLastInfo, mLastNetworkInfo);
+                }
+                if (mIncludeSaved) {
+                    mAccessPoints.add(accessPoint);
+                    apMap.put(accessPoint.getSsid(), accessPoint);
+                } else {
+                    // If we aren't using saved networks, drop them into the cache so that
+                    // we have access to their saved info.
+                    mCachedAccessPoints.add(accessPoint);
+                }
+            }
+        }
+
+        final List<ScanResult> results = mWifiManager.getScanResults();
+        if (results != null) {
+            for (ScanResult result : results) {
+                // Ignore hidden and ad-hoc networks.
+                if (result.SSID == null || result.SSID.length() == 0 ||
+                        result.capabilities.contains("[IBSS]")) {
+                    continue;
+                }
+
+                boolean found = false;
+                for (AccessPoint accessPoint : apMap.getAll(result.SSID)) {
+                    if (accessPoint.update(result)) {
+                        found = true;
+                        break;
+                    }
+                }
+                if (!found && mIncludeScans) {
+                    AccessPoint accessPoint = getCachedOrCreate(result);
+                    if (mLastInfo != null && mLastNetworkInfo != null) {
+                        accessPoint.update(mLastInfo, mLastNetworkInfo);
+                    }
+                    mAccessPoints.add(accessPoint);
+                    apMap.put(accessPoint.getSsid(), accessPoint);
+                }
+            }
+        }
+
+        // Pre-sort accessPoints to speed preference insertion
+        Collections.sort(mAccessPoints);
+        if (mListener != null) {
+            mListener.onAccessPointsChanged();
+        }
+    }
+
+    private AccessPoint getCachedOrCreate(ScanResult result) {
+        final int N = mCachedAccessPoints.size();
+        for (int i = 0; i < N; i++) {
+            if (mCachedAccessPoints.get(i).matches(result)) {
+                AccessPoint ret = mCachedAccessPoints.remove(i);
+                ret.update(result);
+                return ret;
+            }
+        }
+        return new AccessPoint(mContext, result);
+    }
+
+    private AccessPoint getCachedOrCreate(WifiConfiguration config) {
+        final int N = mCachedAccessPoints.size();
+        for (int i = 0; i < N; i++) {
+            if (mCachedAccessPoints.get(i).matches(config)) {
+                AccessPoint ret = mCachedAccessPoints.remove(i);
+                ret.loadConfig(config);
+                return ret;
+            }
+        }
+        return new AccessPoint(mContext, config);
+    }
+
+    private void updateNetworkInfo(NetworkInfo networkInfo) {
+        /* sticky broadcasts can call this when wifi is disabled */
+        if (!mWifiManager.isWifiEnabled()) {
+            mScanner.pause();
+            return;
+        }
+
+        if (networkInfo != null &&
+                networkInfo.getDetailedState() == DetailedState.OBTAINING_IPADDR) {
+            mScanner.pause();
+        } else {
+            mScanner.resume();
+        }
+
+        mLastInfo = mWifiManager.getConnectionInfo();
+        if (networkInfo != null) {
+            mLastNetworkInfo = networkInfo;
+        }
+
+        boolean reorder = false;
+        for (int i = mAccessPoints.size() - 1; i >= 0; --i) {
+            if (mAccessPoints.get(i).update(mLastInfo, mLastNetworkInfo)) {
+                reorder = true;
+            }
+        }
+        if (reorder) {
+            Collections.sort(mAccessPoints);
+            if (mListener != null) {
+                mListener.onAccessPointsChanged();
+            }
+        }
+    }
+
+    private void updateWifiState(int state) {
+        if (state == WifiManager.WIFI_STATE_ENABLED) {
+            mScanner.resume();
+        } else {
+            mLastInfo = null;
+            mLastNetworkInfo = null;
+            mScanner.pause();
+        }
+        if (mListener != null) {
+            mListener.onWifiStateChanged(state);
+        }
+    }
+
+    public static List<AccessPoint> getCurrentAccessPoints(Context context, boolean includeSaved,
+            boolean includeScans) {
+        WifiTracker tracker = new WifiTracker(context, null, includeSaved, includeScans);
+        tracker.forceUpdate();
+        return tracker.getAccessPoints();
+    }
+
+    @VisibleForTesting
+    final BroadcastReceiver mReceiver = new BroadcastReceiver() {
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            String action = intent.getAction();
+            if (WifiManager.WIFI_STATE_CHANGED_ACTION.equals(action)) {
+                updateWifiState(intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE,
+                        WifiManager.WIFI_STATE_UNKNOWN));
+            } else if (WifiManager.SCAN_RESULTS_AVAILABLE_ACTION.equals(action) ||
+                    WifiManager.CONFIGURED_NETWORKS_CHANGED_ACTION.equals(action) ||
+                    WifiManager.LINK_CONFIGURATION_CHANGED_ACTION.equals(action)) {
+                updateAccessPoints();
+            } else if (WifiManager.NETWORK_STATE_CHANGED_ACTION.equals(action)) {
+                NetworkInfo info = (NetworkInfo) intent.getParcelableExtra(
+                        WifiManager.EXTRA_NETWORK_INFO);
+                mConnected.set(info.isConnected());
+                if (mListener != null) {
+                    mListener.onConnectedChanged();
+                }
+                updateAccessPoints();
+                updateNetworkInfo(info);
+            } else if (WifiManager.RSSI_CHANGED_ACTION.equals(action)) {
+                updateNetworkInfo(null);
+            }
+        }
+    };
+
+    @VisibleForTesting
+    class Scanner extends Handler {
+        private int mRetry = 0;
+
+        void resume() {
+            if (!hasMessages(0)) {
+                sendEmptyMessage(0);
+            }
+        }
+
+        void forceScan() {
+            removeMessages(0);
+            sendEmptyMessage(0);
+        }
+
+        void pause() {
+            mRetry = 0;
+            removeMessages(0);
+        }
+
+        @Override
+        public void handleMessage(Message message) {
+            if (mWifiManager.startScan()) {
+                mRetry = 0;
+            } else if (++mRetry >= 3) {
+                mRetry = 0;
+                if (mContext != null) {
+                    Toast.makeText(mContext, R.string.wifi_fail_to_scan, Toast.LENGTH_LONG).show();
+                }
+                return;
+            }
+            sendEmptyMessageDelayed(0, WIFI_RESCAN_INTERVAL_MS);
+        }
+    }
+
+    /** A restricted multimap for use in constructAccessPoints */
+    private static class Multimap<K,V> {
+        private final HashMap<K,List<V>> store = new HashMap<K,List<V>>();
+        /** retrieve a non-null list of values with key K */
+        List<V> getAll(K key) {
+            List<V> values = store.get(key);
+            return values != null ? values : Collections.<V>emptyList();
+        }
+
+        void put(K key, V val) {
+            List<V> curVals = store.get(key);
+            if (curVals == null) {
+                curVals = new ArrayList<V>(3);
+                store.put(key, curVals);
+            }
+            curVals.add(val);
+        }
+    }
+
+    public interface WifiListener {
+        /**
+         * Called when the state of Wifi has changed, the state will be one of
+         * the following.
+         *
+         * <li>{@link WifiManager#WIFI_STATE_DISABLED}</li>
+         * <li>{@link WifiManager#WIFI_STATE_ENABLED}</li>
+         * <li>{@link WifiManager#WIFI_STATE_DISABLING}</li>
+         * <li>{@link WifiManager#WIFI_STATE_ENABLING}</li>
+         * <li>{@link WifiManager#WIFI_STATE_UNKNOWN}</li>
+         * <p>
+         *
+         * @param state The new state of wifi.
+         */
+        void onWifiStateChanged(int state);
+
+        /**
+         * Called when the connection state of wifi has changed and isConnected
+         * should be called to get the updated state.
+         */
+        void onConnectedChanged();
+
+        /**
+         * Called to indicate the list of AccessPoints has been updated and
+         * getAccessPoints should be called to get the latest information.
+         */
+        void onAccessPointsChanged();
+    }
+}