Wifi 源码学习之wifi列表

wifi系列博客地址：

Wifi源码学习（Android5.1）之wifi开关
Wifi源码学习（Android5.1）之wifi optionItem
Wifi源码学习（Android5.1）之wifi列表

Wifi 列表：

Settings\src\com\android\settings\wifi\WifiSettings.java

首先看一下这个类。

public class WifiSettings extends RestrictedSettingsFragment        implements DialogInterface.OnClickListener, Indexable  {

继承了 Fragment，那就按照 Fragment 的生命周期思想来学习就好了。

@Overridepublic void onResume() {    final Activity activity = getActivity();    super.onResume();    if (mWifiEnabler != null) {        mWifiEnabler.resume(activity);    }    // 注册 广播接受者，接收什么广播呢？看下边    activity.registerReceiver(mReceiver, mFilter);    //更新界面    updateAccessPoints();}

// 注册的广播，源码中根据这些广播，来动态的修改界面中的显示

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);

根据当前 wifi 的状态来更新界面
// 单独抽离出来写成一个单纯根据 wifi 状态来更新界面的方法，便于复用。

/** * Shows the latest access points available with supplemental information like * the strength of network and the security for it. */private void updateAccessPoints() {    // Safeguard from some delayed event handling    if (getActivity() == null) return;    if (isUiRestricted()) {        addMessagePreference(R.string.wifi_empty_list_user_restricted);        return;    }    // 获取wifi状态    final int wifiState = mWifiManager.getWifiState();    //when we update the screen, check if verbose logging has been turned on or off    mVerboseLogging = mWifiManager.getVerboseLoggingLevel();    switch (wifiState) {        // wifi 为可用状态        case WifiManager.WIFI_STATE_ENABLED:            // AccessPoints are automatically sorted with TreeSet.            // 获取数据            final Collection<AccessPoint> accessPoints =                    constructAccessPoints(getActivity(), mWifiManager, mLastInfo,                            mLastNetworkInfo);            // 清空历史            getPreferenceScreen().removeAll();            if (accessPoints.size() == 0) {                // 没有数据就显示无可用 WiFi 界面                addMessagePreference(R.string.wifi_empty_list_wifi_on);            }            // 有数据就显示            for (AccessPoint accessPoint : accessPoints) {                // Ignore access points that are out of range.                if (accessPoint.getLevel() != -1) {                    getPreferenceScreen().addPreference(accessPoint);                }            }            break;        // wifi 正在打开...        case WifiManager.WIFI_STATE_ENABLING:            getPreferenceScreen().removeAll();            break;        // wifi 正在关闭...        case WifiManager.WIFI_STATE_DISABLING:            addMessagePreference(R.string.wifi_stopping);            break;        // wifi 不可用状态        case WifiManager.WIFI_STATE_DISABLED:            setOffMessage();            break;    }}

// 获取wifi信息的方法

/** Returns sorted list of access points */private static List<AccessPoint> constructAccessPoints(Context context,        WifiManager wifiManager, WifiInfo lastInfo, NetworkInfo lastNetworkInfo) {    ArrayList<AccessPoint> accessPoints = new ArrayList<AccessPoint>();    /** 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>();      // 获取已经 配置过的 wifi    final List<WifiConfiguration> configs = wifiManager.getConfiguredNetworks();    if (configs != null) {        // Update "Saved Networks" menu option.        if (savedNetworksExist != (configs.size() > 0)) {            savedNetworksExist = !savedNetworksExist;            if (context instanceof Activity) {                ((Activity) context).invalidateOptionsMenu();            }        }        for (WifiConfiguration config : configs) {            if (config.selfAdded && config.numAssociation == 0) {                continue;            }            AccessPoint accessPoint = new AccessPoint(context, config);            if (lastInfo != null && lastNetworkInfo != null) {                accessPoint.update(lastInfo, lastNetworkInfo);            }            accessPoints.add(accessPoint);            apMap.put(accessPoint.ssid, accessPoint);        }    }    // 获取搜索到的 wifi 信息    final List<ScanResult> results = wifiManager.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;            // 如果已经存在，则进行更新，为了快速更新界面，看上边 apMap 的英文注释            for (AccessPoint accessPoint : apMap.getAll(result.SSID)) {                if (accessPoint.update(result))                    found = true;            }            if (!found) {                // 如果没有，则重新创建新对象，进行添加                AccessPoint accessPoint = new AccessPoint(context, result);                if (lastInfo != null && lastNetworkInfo != null) {                    accessPoint.update(lastInfo, lastNetworkInfo);                }                accessPoints.add(accessPoint);                // 添加到 apMap 中                apMap.put(accessPoint.ssid, accessPoint);            }        }    }    // Pre-sort accessPoints to speed preference insertion    // 将wifi进行排序（按照是否已经连接，信号量等）    Collections.sort(accessPoints);    return accessPoints;}

wifi 列表的生成源码分析暂时就到这儿了。