Usb setting 中tethering 设置流程

一 资源位置及入口文件

USB tethering, usb_tethering_button_text

Xml/tether_prefs.xml------usb_tether_settings,布局文件

packages/apps/Settings/AndroidManifest.xml

<!-- Keep compatibility with old shortcuts. -->

<activity-alias android:name=".TetherSettings"

android:label="@string/tether_settings_title_all"

android:clearTaskOnLaunch="true"

android:exported="true"

android:targetActivity="Settings$TetherSettingsActivity">

<meta-data android:name="com.android.settings.FRAGMENT_CLASS"

android:value="com.android.settings.TetherSettings" />

<meta-data android:name="com.android.settings.TOP_LEVEL_HEADER_ID"

android:resource="@id/wireless_settings" />

<meta-data android:name="com.android.settings.PARENT_FRAGMENT_TITLE"

android:resource="@string/wireless_networks_settings_title" />

<meta-data android:name="com.android.settings.PARENT_FRAGMENT_CLASS"

android:value="com.android.settings.Settings$WirelessSettingsActivity" />

</activity-alias>

TetherSettings.java

二 触发流程

2.1 TetherSettings.java

packages/apps/Settings/src/com/android/settings/TetherSettings.java

onPreferenceTreeClick

SXlog.d(TAG, "onPreferenceTreeClick - setusbTethering(" + newState + ") mUsbTethering: " + mUsbTethering);

setUsbTethering(true);

下面是设置时抓取的log日志

D/TetherSettings( 543): onPreferenceTreeClick - setusbTethering(true) mUsbTethering: true

D/Tethering( 271): setUsbTethering(true)

D/UsbDeviceManager( 271): setCurrentFunction(rndis) default: false

W/UsbDeviceManager( 271): handleMessage: 2

W/UsbDeviceManager( 271): setEnabledFunctions: functions = rndis

W/UsbDeviceManager( 271): setEnabledFunctions, mDefaultFunctions: mtp,adb

W/UsbDeviceManager( 271): setEnabledFunctions, mCurrentFunctions: mtp,adb

D/UsbDeviceManager( 271): setEnabledFunctions, mSettingFunction: mtp,adb

W/UsbDeviceManager( 271): containsFunction, functions: rndis

W/UsbDeviceManager( 271): containsFunction, function: adb

W/UsbDeviceManager( 271): containsFunction index: -1

W/UsbDeviceManager( 271): addFunction, functions: rndis

W/UsbDeviceManager( 271): addFunction, function: adb

W/UsbDeviceManager( 271): containsFunction, functions: rndis

W/UsbDeviceManager( 271): containsFunction, function: acm

W/UsbDeviceManager( 271): containsFunction index: -1

W/UsbDeviceManager( 271): containsFunction, functions: rndis,adb

W/UsbDeviceManager( 271): containsFunction, function: acm

W/UsbDeviceManager( 271): containsFunction index: -1

D/UsbDeviceManager( 271): setUsbConfig(none)

W/UsbDeviceManager( 271): setUsbConfig, config: none

public boolean onPreferenceTreeClick(PreferenceScreen screen, Preference preference) {

ConnectivityManager cm =

(ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);

if (preference == mUsbTether) {

if (!mUsbTethering) {

boolean newState = mUsbTether.isChecked();

mUsbTethering = true;

mUsbTetherCheckEnable = false;

mUsbTether.setEnabled(false);

SXlog.d(TAG, "onPreferenceTreeClick - setusbTethering(" + newState + ") mUsbTethering: " + mUsbTethering);

if (newState) {

startProvisioningIfNecessary(USB_TETHERING);

} else {

setUsbTethering(newState);

}

} else {

return true;

}

} else if (preference == mBluetoothTether) {

private void setUsbTethering(boolean enabled) {

ConnectivityManager cm =

(ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);

if (cm.setUsbTethering(enabled) != ConnectivityManager.TETHER_ERROR_NO_ERROR) {

mUsbTether.setChecked(false);

mUsbTether.setSummary(R.string.usb_tethering_errored_subtext);

return;

}

mUsbTether.setSummary("");

}

2.2 ConnectivityManager.java

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

private final IConnectivityManager mService;

public int setUsbTethering(boolean enable) {

try {

return mService.setUsbTethering(enable);

} catch (RemoteException e) {

return TETHER_ERROR_SERVICE_UNAVAIL;

}

}

manager 和service有一个对应关系，固定的规则。 manager是为了sdk诞生的，方便app开发者调用。其实可以直接调用service，如mountservice是没有mountmanager的。

service是在系统起来是就被android系统启动的，而manager是后期有需要时实例化起来的。

Service的目录在：/frameworks/base/services/java/com/android/server/

manager的目录在：frameworks/base/core/java/android

2.3 ConnectivityService.java

frameworks/base/services/java/com/android/server

private Tethering mTethering;

public int setUsbTethering(boolean enable) {

enforceTetherAccessPermission();

if (isTetheringSupported()) {

return mTethering.setUsbTethering(enable);

} else {

return ConnectivityManager.TETHER_ERROR_UNSUPPORTED;

}

}

 

2.4 Tethering.java

frameworks/base/services/java/com/android/server/connectivity/Tethering.java

public int setUsbTethering(boolean enable) {

UsbManager usbManager = (UsbManager)mContext.getSystemService(Context.USB_SERVICE);

………………

else {

mUsbTetherRequested = true;

usbManager.setCurrentFunction(UsbManager.USB_FUNCTION_RNDIS, false);

}

通过service，来获取manager，进行操作。这个tethering.java的构造函数

public Tethering(Context context, INetworkManagementService nmService,

INetworkStatsService statsService, IConnectivityManager connService, Looper looper) {

Context是获取全局信息的接口，

2.5 UsbManager.java

/frameworks/base/core/java/android/hardware/usb/UsbManager.java

public void setCurrentFunction(String function, boolean makeDefault) {

try {

mService.setCurrentFunction(function, makeDefault);

} catch (RemoteException e) {

Log.e(TAG, "RemoteException in setCurrentFunction", e);

}

}

2.6 frameworks/base/services/java/com/android/server/usb$

mengfd1@tablet-C:~/work/A2107/frameworks/base/services/java/com/android/server$ cd usb

mengfd1@tablet-C:~/work/A2107/frameworks/base/services/java/com/android/server/usb$ ls

UsbDeviceManager.java UsbHostManager.java UsbService.java UsbSettingsManager.java

/frameworks/base/services/java/com/android/server/usb/UsbService.java

public void setCurrentFunction(String function, boolean makeDefault) {

mContext.enforceCallingOrSelfPermission(android.Manifest.permission.MANAGE_USB, null);

if (mDeviceManager != null) {

mDeviceManager.setCurrentFunction(function, makeDefault);

} else {

throw new IllegalStateException("USB device mode not supported");

}

}

/frameworks/base/services/java/com/android/server/usb/UsbDeviceManager.java

public void setCurrentFunction(String function, boolean makeDefault) {

if (DEBUG) Slog.d(TAG, "setCurrentFunction(" + function + ") default: " + makeDefault);

mHandler.sendMessage(MSG_SET_CURRENT_FUNCTION, function, makeDefault);

}

public void handleMessage(Message msg) {

case MSG_SET_CURRENT_FUNCTION:

String function = (String)msg.obj;

boolean makeDefault = (msg.arg1 == 1);

if (function != null && function.equals(UsbManager.USB_FUNCTION_CHARGING_ONLY)) {

mSettingUsbCharging = true;

SXlog.d(TAG, "handleMessage - MSG_SET_CURRENT_FUNCTION - USB_FUNCTION_CHARGING_ONLY - makeDefault: " + makeDefault);

} else {

mSettingUsbCharging = false;

}

setEnabledFunctions(function, makeDefault);

SXlog.d(TAG, "handleMessage - MSG_SET_CURRENT_FUNCTION - function: " + function);

break;

 

private void setEnabledFunctions(String functions, boolean makeDefault) {

private boolean setUsbConfig(String config) {

SystemProperties.set("sys.usb.config", config);