Android usb网络共享开关
16lz
2021-01-23
Android7.0 usb网络共享开关
涉及的文件：
packages\apps\Settings\src\com\android\settings\TetherSettings.java
packages\apps\Settings\src\com\android\settings\TetherService.java
frameworks\base\services\core\java\com\android\server\connectivity\Tethering.java
TetherSettings.java中重点函数
- 状态变化
private void updateState() { String[] available = mCm.getTetherableIfaces(); String[] tethered = mCm.getTetheredIfaces(); String[] errored = mCm.getTetheringErroredIfaces(); updateState(available, tethered, errored);}private void updateState(String[] available, String[] tethered, String[] errored) { updateUsbState(available, tethered, errored); updateBluetoothState(available, tethered, errored);}private void updateUsbState(String[] available, String[] tethered, String[] errored) { boolean usbAvailable = mUsbConnected && !mMassStorageActive; int usbError = ConnectivityManager.TETHER_ERROR_NO_ERROR; for (String s : available) { for (String regex : mUsbRegexs) { if (s.matches(regex)) { if (usbError == ConnectivityManager.TETHER_ERROR_NO_ERROR) { usbError = mCm.getLastTetherError(s); } } } } boolean usbTethered = false; for (String s : tethered) { for (String regex : mUsbRegexs) { if (s.matches(regex)) usbTethered = true; } } boolean usbErrored = false; for (String s: errored) { for (String regex : mUsbRegexs) { if (s.matches(regex)) usbErrored = true; } } if (usbTethered) { // 已共享网络 mUsbTether.setSummary(R.string.usb_tethering_active_subtext); mUsbTether.setEnabled(!mDataSaverEnabled); mUsbTether.setChecked(true); } else if (usbAvailable) { if (usbError == ConnectivityManager.TETHER_ERROR_NO_ERROR) { // usb已连接，usb共享选项打开选项从灰色变为可操作 mUsbTether.setSummary(R.string.usb_tethering_available_subtext); } else { mUsbTether.setSummary(R.string.usb_tethering_errored_subtext); } mUsbTether.setEnabled(!mDataSaverEnabled); mUsbTether.setChecked(false); } else if (usbErrored) { mUsbTether.setSummary(R.string.usb_tethering_errored_subtext); mUsbTether.setEnabled(false); mUsbTether.setChecked(false); } else if (mMassStorageActive) { // usb共享和adb、访问Android存储公用一个usb，当选择浏览Android设备文件时，usb共享不可以使用 // 提示此时状态为文件浏览模式，usb共享不可操作 mUsbTether.setSummary(R.string.usb_tethering_storage_active_subtext); mUsbTether.setEnabled(false); mUsbTether.setChecked(false); } else { // usb断开连接 mUsbTether.setSummary(R.string.usb_tethering_unavailable_subtext); mUsbTether.setEnabled(false); mUsbTether.setChecked(false); }}12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970- 打开usb网络共享
private void startTethering(int choice) { if (choice == TETHERING_BLUETOOTH) { // Turn on Bluetooth first. BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter(); if (adapter.getState() == BluetoothAdapter.STATE_OFF) { mBluetoothEnableForTether = true; adapter.enable(); mBluetoothTether.setSummary(R.string.bluetooth_turning_on); mBluetoothTether.setEnabled(false); return; } } mCm.startTethering(choice, true, mStartTetheringCallback, mHandler);}@Overridepublic boolean onPreferenceTreeClick(Preference preference) {if (preference == mUsbTether) { if (mUsbTether.isChecked()) { // 打开usb网络共享 startTethering(TETHERING_USB); } else { // 关闭USB网络共享 mCm.stopTethering(TETHERING_USB); }} else if (preference == mBluetoothTether) { if (mBluetoothTether.isChecked()) { startTethering(TETHERING_BLUETOOTH); } else { mCm.stopTethering(TETHERING_BLUETOOTH); // No ACTION_TETHER_STATE_CHANGED is fired or bluetooth unless a device is // connected. Need to update state manually. updateState(); }} else if (preference == mCreateNetwork) { showDialog(DIALOG_AP_SETTINGS);} return super.onPreferenceTreeClick(preference);}1234567891011121314151617181920212223242526272829303132333435363738394041framework中的重点函数
- 追踪代码，实际会调用到Tethering.java的
public int setUsbTethering(boolean enable) { if (VDBG) Log.d(TAG, "setUsbTethering(" + enable + ")"); UsbManager usbManager = (UsbManager)mContext.getSystemService(Context.USB_SERVICE); synchronized (mPublicSync) { if (enable) { if (mRndisEnabled) { final long ident = Binder.clearCallingIdentity(); try { // 如果对/sys/class/android_usb/android0已经设置为rndis // 对usb interface设置ip tetherMatchingInterfaces(true, ConnectivityManager.TETHERING_USB); } finally { Binder.restoreCallingIdentity(ident); } } else { mUsbTetherRequested = true; // 对/sys/class/android_usb/android0设置为rndis模式 usbManager.setCurrentFunction(UsbManager.USB_FUNCTION_RNDIS); } } else { final long ident = Binder.clearCallingIdentity(); try { tetherMatchingInterfaces(false, ConnectivityManager.TETHERING_USB); } finally { Binder.restoreCallingIdentity(ident); } if (mRndisEnabled) { usbManager.setCurrentFunction(null); } mUsbTetherRequested = false; } } return ConnectivityManager.TETHER_ERROR_NO_ERROR;}1234567891011121314151617181920212223242526272829303132333435- rndis、adb、mtp等功能都是复用/sys/class/android_usb/android0设备，可以通过对设备写不同的值进行切换或者几个功能共存。在UsbService中对sys.usb.config设置不同的值，在rc文件中处理，如下
...on property:sys.usb.config=ptp write /sys/class/android_usb/android0/enable 0 write /sys/class/android_usb/android0/idVendor 1f3a write /sys/class/android_usb/android0/idProduct 1008 write /sys/class/android_usb/android0/functions ${sys.usb.config} write /sys/class/android_usb/android0/enable 1 setprop sys.usb.state ${sys.usb.config}on property:sys.usb.config=ptp,adb write /sys/class/android_usb/android0/enable 0 write /sys/class/android_usb/android0/idVendor 1f3a write /sys/class/android_usb/android0/idProduct 1009 write /sys/class/android_usb/android0/functions ${sys.usb.config} write /sys/class/android_usb/android0/enable 1 start adbd setprop sys.usb.state ${sys.usb.config}on property:sys.usb.config=rndis write /sys/class/android_usb/android0/enable 0 write /sys/class/android_usb/android0/idVendor 1f3a write /sys/class/android_usb/android0/idProduct 100a write /sys/class/android_usb/android0/functions ${sys.usb.config} write /sys/class/android_usb/android0/bDeviceClass 224 write /sys/class/android_usb/android0/enable 1 setprop sys.usb.state ${sys.usb.config}on property:sys.usb.config=rndis,adb write /sys/class/android_usb/android0/enable 0 write /sys/class/android_usb/android0/idVendor 1f3a write /sys/class/android_usb/android0/idProduct 100b write /sys/class/android_usb/android0/functions ${sys.usb.config} write /sys/class/android_usb/android0/bDeviceClass 224 write /sys/class/android_usb/android0/enable 1 start adbd setprop sys.usb.state ${sys.usb.config}...更多相关文章
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