android wifi热点setting(一)

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android wifi热点setting(一)

#android wifi热点setting(一)| 来源: 网络整理| 查看: 265

一、wifi原生setting的入口在WifiTetherSettings.java

二、改热点Setting的时候可以直接只编译Settings.apk，并且替换，

三、wifi热点貌似官方支持黑名单和支持设置热点支持的最大client数

四、热点的双频合一

1、那设置频段为5G的时候，也就是2的时候，什么时候系统会被改成3（双频）的呢，

wifi模块的重要的类：

【安卓Framework学习】Wifi框架学习之核心类_leeeeesss的博客-CSDN博客_android wifi框架

热点开发的官方文档：

https://source.android.google.cn/docs/core/connect/wifi-softap

https://developer.android.google.cn/reference/android/net/ConnectivityManager

https://developer.android.google.cn/guide/topics/connectivity/wifi-permissions

重要：

Wi-Fi HAL | Android 开源项目 | Android Open Source Project

一、wifi原生setting的入口在WifiTetherSettings.java

packages/apps/Settings/src/com/android/settings/wifi/tether/WifiTetherSettings.java

WifiTetherSettings层

开启热点和关闭热点的最后是使用ConnectivityManager的 startTethering 和 stopTethering

packages/apps/Settings/src/com/android/settings/wifi/tether/WifiTetherSwitchBarController.java

void stopTether() { mSwitchBar.setEnabled(false); mConnectivityManager.stopTethering(TETHERING_WIFI); } void startTether() { mSwitchBar.setEnabled(false); mConnectivityManager.startTethering(TETHERING_WIFI, true /* showProvisioningUi */, mOnStartTetheringCallback, new Handler(Looper.getMainLooper())); }

ConnectivityManager层

frameworks/base/core/java/android/net/ConnectivityManager.java

//参数有4个 public void startTethering(int type, boolean showProvisioningUi, final OnStartTetheringCallback callback, Handler handler) { mTetheringManager.startTethering(request, executor, tetheringCallback); } public void stopTethering(int type) { mTetheringManager.stopTethering(type); }

TetheringManager层

frameworks/base/packages/Tethering/common/TetheringLib/src/android/net/TetheringManager.java

调用到Tethering

public void startTethering(@NonNull final TetheringRequest request, @NonNull final Executor executor, @NonNull final StartTetheringCallback callback) { getConnector(c -> c.startTethering(request.getParcel(), callerPkg, listener)); } public void stopTethering(@TetheringType final int type) { getConnector(c -> c.stopTethering(type, callerPkg, new IIntResultListener.Stub() { @Override public void onResult(int resultCode) { } })); }

Tethering层

frameworks/base/packages/Tethering/src/com/android/networkstack/tethering/Tethering.java

最后startTethering调用到最后是WifiManager.startTetheredHotspot,

stopTethering 调用到最后是WifiManager.stopSoftAp

void startTethering(final TetheringRequestParcel request, final IIntResultListener listener) { mHandler.post(() -> { enableTetheringInternal(request.tetheringType, true /* enabled */, listener); }); } private void enableTetheringInternal(int type, boolean enable, final IIntResultListener listener) { int result = TETHER_ERROR_NO_ERROR; switch (type) { case TETHERING_WIFI: result = setWifiTethering(enable); break; case TETHERING_USB: result = setUsbTethering(enable); break; case TETHERING_BLUETOOTH: setBluetoothTethering(enable, listener); break; default: Log.w(TAG, "Invalid tether type."); result = TETHER_ERROR_UNKNOWN_TYPE; } } private int setWifiTethering(final boolean enable) { final WifiManager mgr = getWifiManager(); if ((enable && mgr.startTetheredHotspot(null /* use existing softap config */)) || (!enable && mgr.stopSoftAp())) { mWifiTetherRequested = enable; return TETHER_ERROR_NO_ERROR; } } 二、改热点Setting的时候可以直接只编译Settings.apk，并且替换，

可以查看Android.bp文件

./system_ext/priv-app/Settings/Settings.apk

三、wifi热点貌似官方支持黑名单和支持设置热点支持的最大client数

通过 Wi-Fi 热点（软 AP）支持网络共享 | Android 开源项目 | Android Open Source Project

在android11热点Setting的WifiTetherSoftApManager.java，有注册SoftapCallback，可以重写一下onCapabilityChanged，这样就可以获取到系统支持的最大的client数量，最后日志显示，

支持的client数量为16

12-27 11:33:33.251 2884 2884 I wqy-WifiTetherPrfeCtl: onStart 12-27 11:33:33.251 2884 2884 I wqy-WifiTetherPrfeCtl: onStart, registerSoftApCallback 12-27 11:33:33.251 2884 2884 I wqy-WifiTethSoApMgr: registerSoftApCallback 12-27 11:33:33.333 2884 2884 I wqy-WifiTethSoApMgr: onStateChanged 12-27 11:33:33.333 2884 2884 I wqy-WifiTethSoApMgr: onConnectedClientsChanged 12-27 11:33:33.333 2884 2884 I wqy-WifiTethSoApMgr: onCapabilityChanged, softApCapability = SupportedFeatures=15MaximumSupportedClientNumber=16 12-27 11:33:33.334 2884 2884 I wqy-WifiTethSoApMgr: onCapabilityChanged, maxClient = 16

packages/apps/Settings/src/com/android/settings/wifi/tether/WifiTetherSoftApManager.java

public void registerSoftApCallback() { Log.i("wqy-WifiTethSoApMgr", "registerSoftApCallback"); mWifiManager.registerSoftApCallback(new HandlerExecutor(mHandler), mSoftApCallback); } private WifiManager.SoftApCallback mSoftApCallback = new WifiManager.SoftApCallback() { @Override public void onStateChanged(int state, int failureReason) { Log.i("wqy-WifiTethSoApMgr", "onStateChanged"); mWifiTetherSoftApCallback.onStateChanged(state, failureReason); } @Override public void onConnectedClientsChanged(List clients) { Log.i("wqy-WifiTethSoApMgr", "onConnectedClientsChanged"); mWifiTetherSoftApCallback.onConnectedClientsChanged(clients); } @Override public void onCapabilityChanged(@NonNull SoftApCapability softApCapability) { Log.i("wqy-WifiTethSoApMgr", "onCapabilityChanged, softApCapability = " + softApCapability); int maxClient = softApCapability.getMaxSupportedClients(); Log.i("wqy-WifiTethSoApMgr", "onCapabilityChanged, maxClient = " + maxClient); // Do nothing: can be updated to add SoftApCapability details (e.g. meximum supported // client number) to the UI. } };

设置最大client数的地方是：

frameworks/opt/net/wifi/service/java/com/android/server/wifi/WifiServiceImpl.java

public void updateSoftApCapability(int subId) { Log.i(TAG, "wqy updateSoftApCapability"); synchronized (mLock) { CarrierConfigManager carrierConfigManager = (CarrierConfigManager) mContext.getSystemService( Context.CARRIER_CONFIG_SERVICE); int carrierMaxClient = carrierConfig.getInt( CarrierConfigManager.Wifi.KEY_HOTSPOT_MAX_CLIENT_COUNT); int finalSupportedClientNumber = mContext.getResources().getInteger( R.integer.config_wifiHardwareSoftapMaxClientCount); Log.i(TAG, "wqy updateSoftApCapability, config_wifiHardwareSoftapMaxClientCount = " + finalSupportedClientNumber); if (carrierMaxClient > 0) { finalSupportedClientNumber = Math.min(finalSupportedClientNumber, carrierMaxClient); } Log.i(TAG, "wqy updateSoftApCapability, carrierMaxClient = " + carrierMaxClient); mTetheredSoftApCapability.setMaxSupportedClients( finalSupportedClientNumber); } onCapabilityChanged(mTetheredSoftApCapability); }

config_wifiHardwareSoftapMaxClientCount 找到的有两个地方：

frameworks/opt/net/wifi/service/res/values/config.xml （根据上面打印，应该这个，因为打印出来的是16）

vendor/qcom/proprietary/commonsys-intf/resource-overlay/common/Wifi/res/values/config.xml （这个暂时不知道有啥用）

四、热点的双频合一

工作中遇到别人提的一个bug，android里应用层设置5G Hz频段 2，设置成功后返回的频段是3，

一开始以为系统默认给开了6G，经过打日志，发现设置5G 频段的时候，它会默认检查config配置里有有没有2.4G，没有的话，会默认加上2.4G的频段，所有设置5G 为2的时候，会默认 2 | 1 = 3,

达标双频合一，这样可以用户连接网络较弱时会自动切换到另一个Wi-Fi频段，这就极大程度保证信号的持续稳定连接，避免了手动切换信号的麻烦。

public static final int BAND_2GHZ = 1; public static final int BAND_5GHZ = 2; public static final int BAND_6GHZ = 4; public static final int BAND_ANY = 7;

「技巧」关于Wi-Fi双频合一，你真的知道么？|频段|5G_新浪新闻

1、那设置频段为5G的时候，也就是2的时候，什么时候系统会被改成3（双频）的呢，

一种可能是设置的时候被修改，一种可能是重启热点的时候被修改

发现同样的链接：Android11 热点Band值为3_峥嵘life的博客-CSDN博客

经过验证：

是在设置热点配置的时候被修改的

在原生Settings里做验证：

我这儿默认是2.4G，所以先获取一下配置，发现band为1，然后设置2为5G，设置完成后，再读取Softapconfig, 发现是3，所以可以确定是设置的时候直接被底层做了修正

packages/apps/Settings/src/com/android/settings/wifi/tether/WifiTetherSwitchBarController.java void startTether() { mSwitchBar.setEnabled(false); //验证代码 final SoftApConfiguration config = mWifiManager.getSoftApConfiguration(); Log.i("wqy-tethring-barcontrol", "wqy get local config band = " + config.getBand()); mWifiManager.setSoftApConfiguration( new SoftApConfiguration.Builder(config).setBand(SoftApConfiguration.BAND_5GHZ) .build()); Log.i("wqy-tethring-barcontrol", "wqy after set 5G, local config band = " + mWifiManager.getSoftApConfiguration().getBand()); mConnectivityManager.startTethering(TETHERING_WIFI, true /* showProvisioningUi */, mOnStartTetheringCallback, new Handler(Looper.getMainLooper())); }

然后设置softapconfig 流程到了WifiServiceImpl.java

经过测试和追踪，在此处做的修改

mWifiApConfigStore.setApConfiguration(softApConfig) frameworks/opt/net/wifi/service/java/com/android/server/wifi/WifiServiceImpl.java public boolean setSoftApConfiguration( @NonNull SoftApConfiguration softApConfig, @NonNull String packageName) { if (WifiApConfigStore.validateApWifiConfiguration(softApConfig, privileged)) { mActiveModeWarden.updateSoftApConfiguration(softApConfig); mWifiThreadRunner.post(() -> mWifiApConfigStore.setApConfiguration(softApConfig)); return true; } else { Log.e(TAG, "Invalid SoftAp Configuration"); return false; } }

可以看出，WifiApConfigStore.java，在设置2为5G的时候，并且没有设置任何信道的时候，会将2.4G也加上

frameworks/opt/net/wifi/service/java/com/android/server/wifi/WifiApConfigStore.java public synchronized void setApConfiguration(SoftApConfiguration config) { Log.i(TAG, "wqy setApConfiguration"); if (config == null) { config = getDefaultApConfiguration(); } else { config = sanitizePersistentApConfig(config); } } private SoftApConfiguration sanitizePersistentApConfig(SoftApConfiguration config) { SoftApConfiguration.Builder convertedConfigBuilder = null; Log.i(TAG, "wqy sanitizePersistentApConfig, config band = " + config.getBand()); // some countries are unable to support 5GHz only operation, always allow for 2GHz when // config doesn't force channel if (config.getChannel() == 0 && (config.getBand() & SoftApConfiguration.BAND_2GHZ) == 0) { Log.w(TAG, "wqy Supplied ap config band without 2.4G, add allowing for 2.4GHz"); if (convertedConfigBuilder == null) { Log.i(TAG, "wqy sanitizePersistentApConfig 1, convertedConfigBuilder is null"); convertedConfigBuilder = new SoftApConfiguration.Builder(config); } Log.i(TAG, "wqy sanitizePersistentApConfig 2, config band = " + convertedConfigBuilder.build().getBand()); convertedConfigBuilder.setBand(config.getBand() | SoftApConfiguration.BAND_2GHZ); Log.i(TAG, "wqy sanitizePersistentApConfig 3, config band = " + convertedConfigBuilder.build().getBand()); } return convertedConfigBuilder == null ? config : convertedConfigBuilder.build(); }

最后回到Settings这边对频宽的处理

当settings界面显示的时候，设置为5G的时候，这边也会将2.4G带上

理由是：一些国家不支持5G，所以需要包括2.4G

packages/apps/Settings/src/com/android/settings/wifi/tether/WifiTetherApBandPreferenceController.java public void updateDisplay() { final SoftApConfiguration config = mWifiManager.getSoftApConfiguration(); boolean is5G = is5GhzBandSupported(); Log.i(TAG, "wqy updateDisplay is5G = " + is5G); if (config == null) { mBandIndex = SoftApConfiguration.BAND_2GHZ; Log.d(TAG, "Updating band index to BAND_2GHZ because no config"); } else if (is5GhzBandSupported()) { mBandIndex = validateSelection(config.getBand()); Log.d(TAG, "Updating band index to " + mBandIndex); } } private int validateSelection(int band) { // unsupported states: // 1: BAND_5GHZ only - include 2GHZ since some of countries doesn't support 5G hotspot // 2: no 5 GHZ support means we can't have BAND_5GHZ - default to 2GHZ if (SoftApConfiguration.BAND_5GHZ == band) { if (!is5GhzBandSupported()) { return SoftApConfiguration.BAND_2GHZ; } return SoftApConfiguration.BAND_5GHZ | SoftApConfiguration.BAND_2GHZ; } return band; }

最终解决问题的思路：

就是将WifiApConfigStore.java里的设置整改处，将设置5G时携带2.4G的逻辑删除

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