{"id":96947,"date":"2026-08-28T20:08:50","date_gmt":"2026-08-28T12:08:50","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/96947.html"},"modified":"2026-08-28T20:08:50","modified_gmt":"2026-08-28T12:08:50","slug":"%e7%ac%ac-39-%e7%ab%a0%ef%bc%9ausb%e3%80%81adb-%e4%b8%8e-mtp","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/96947.html","title":{"rendered":"\u7b2c 39 \u7ae0\uff1aUSB\u3001ADB \u4e0e MTP"},"content":{"rendered":"

Android \u7684 USB \u8fde\u63a5\u53ef\u540c\u65f6\u670d\u52a1\u4e09\u7c7b\u5b8c\u5168\u4e0d\u540c\u7684\u4f7f\u7528\u573a\u666f\uff1a\u5f00\u53d1\u8005\u901a\u8fc7 ADB \u8c03\u8bd5\u5e94\u7528\u3001\u666e\u901a\u7528\u6237\u901a\u8fc7 MTP \u4f20\u8f93\u7167\u7247\u3001\u914d\u4ef6\u5382\u5546\u901a\u8fc7 USB \u4e3b\u673a\u6a21\u5f0f\u63a5\u5165\u6e38\u620f\u624b\u67c4\u3002\u6bcf\u4e00\u7c7b\u573a\u666f\u90fd\u4f7f\u7528\u8f6f\u4ef6\u6808\u4e2d\u72ec\u7acb\u7684\u6a21\u5757\uff0c\u8be5\u8f6f\u4ef6\u6808\u8986\u76d6\u4ece\u7528\u6237\u7a7a\u95f4 Java \u670d\u52a1\uff0c\u4e00\u76f4\u5230 Linux \u5185\u6838\u7684 USB \u5c0f\u5de5\u5177\uff08gadget\uff09\u4e0e\u4e3b\u673a\u63a7\u5236\u5668\u9a71\u52a8\u3002\u672c\u7ae0\u8ffd\u8e2a USB \u7ebf\u8def\u4e0a\u6bcf\u4e00\u5b57\u8282\u6570\u636e\u7684\u6d41\u5411\uff0c\u4f9d\u6b21\u7ecf\u8fc7 HAL \u5c42\u3001\u6846\u67b6\u5c42\u670d\u52a1\uff0c\u6700\u7ec8\u62b5\u8fbe\u5e94\u7528\u5c42\uff0c\u5168\u6587\u4f1a\u5f15\u7528\u771f\u5b9e\u7684 AOSP \u6e90\u7801\u8def\u5f84\u3002<\/p>\n

39.1 USB \u6846\u67b6\u6982\u8ff0 <\/h3>\n

39.1.1 \u6574\u4f53\u67b6\u6784\u6982\u89c8 <\/h4>\n

Android USB \u5b50\u7cfb\u7edf\u5212\u5206\u4e3a 4 \u4e2a\u5782\u76f4\u5c42\u7ea7\uff1a\u516c\u5f00 SDK API\uff08UsbManager\uff09\u3001\u7cfb\u7edf\u670d\u52a1\uff08UsbService \u53ca\u5176\u5b50\u7ba1\u7406\u5668\uff09\u3001\u786c\u4ef6\u62bd\u8c61\u5c42\uff08AIDL HAL \u63a5\u53e3 IUsb\u3001IUsbGadget\uff09\u3001Linux \u5185\u6838 USB \u5b50\u7cfb\u7edf\uff08gadget \u9a71\u52a8\u3001\u4e3b\u673a\u63a7\u5236\u5668\u9a71\u52a8\u3001configfs\u3001functionfs\uff09\u3002<\/p>\n

<\/p>\n

39.1.2 \u6838\u5fc3\u7ec4\u4ef6 <\/h4>\n\n\n \u7ec4\u4ef6
\n \u7c7b\u578b
\n \u6e90\u7801\u8def\u5f84
\n \u4f5c\u7528
\n  
\n  
\n  
\n  
\n <\/tr>\n\n\n\n\n\n\n\n\n\n\n\n
UsbManager<\/td>\nSDK API<\/td>\nframeworks\/base\/core\/java\/android\/hardware\/usb\/UsbManager.java<\/td>\n\u5e94\u7528\u4f7f\u7528\u7684\u516c\u5f00 API<\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n<\/tr>\n
UsbService<\/td>\n\u7cfb\u7edf\u670d\u52a1<\/td>\nframeworks\/base\/services\/usb\/…\/UsbService.java<\/td>\n\u6838\u5fc3\u534f\u8c03\u5668<\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n<\/tr>\n
UsbDeviceManager<\/td>\n\u5185\u90e8\u7ba1\u7406\u5668<\/td>\nframeworks\/base\/services\/usb\/…\/UsbDeviceManager.java<\/td>\nGadget \u6a21\u5f0f\u72b6\u6001\u673a<\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n<\/tr>\n
UsbHostManager<\/td>\n\u5185\u90e8\u7ba1\u7406\u5668<\/td>\nframeworks\/base\/services\/usb\/…\/UsbHostManager.java<\/td>\n\u4e3b\u673a\u6a21\u5f0f\u8bbe\u5907\u679a\u4e3e<\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n<\/tr>\n
UsbPortManager<\/td>\n\u5185\u90e8\u7ba1\u7406\u5668<\/td>\nframeworks\/base\/services\/usb\/…\/UsbPortManager.java<\/td>\nType\u2011C \u7aef\u53e3\u7ba1\u7406<\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n<\/tr>\n
UsbPermissionManager<\/td>\n\u5185\u90e8\u7ba1\u7406\u5668<\/td>\nframeworks\/base\/services\/usb\/…\/UsbPermissionManager.java<\/td>\n\u6309\u7528\u6237\u8ddf\u8e2a\u6743\u9650<\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n<\/tr>\n
IUsb<\/td>\nAIDL HAL<\/td>\nhardware\/interfaces\/usb\/aidl\/…\/IUsb.aidl<\/td>\n\u7aef\u53e3\u72b6\u6001\u3001\u89d2\u8272\u5207\u6362<\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n<\/tr>\n
IUsbGadget<\/td>\nAIDL HAL<\/td>\nhardware\/interfaces\/usb\/gadget\/aidl\/…\/IUsbGadget.aidl<\/td>\nGadget \u529f\u80fd\u914d\u7f6e<\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n<\/tr>\n
adbd<\/td>\n\u539f\u751f\u5b88\u62a4\u8fdb\u7a0b<\/td>\npackages\/modules\/adb\/daemon\/main.cpp<\/td>\nADB \u5b88\u62a4\u8fdb\u7a0b<\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n<\/tr>\n
MTP Native<\/td>\n\u539f\u751f\u5e93<\/td>\nframeworks\/av\/media\/mtp\/<\/td>\nMTP \u534f\u8bae\u5b9e\u73b0<\/td>\nMTP Service<\/td>\nJava \u670d\u52a1<\/td>\npackages\/services\/Mtp\/<\/td>\nMTP \u6587\u6863\u63d0\u4f9b\u8005<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

39.1.3 \u53cc\u6a21\u5f0f\u67b6\u6784\uff1aGadget \u6a21\u5f0f\u4e0e\u4e3b\u673a\u6a21\u5f0f <\/h4>\n

\u540c\u4e00\u4e2a USB Type\u2011C \u7aef\u53e3\u53ef\u5de5\u4f5c\u5728\u4e24\u79cd\u5b8c\u5168\u4e0d\u540c\u7684\u6a21\u5f0f\uff0c\u6a21\u5f0f\u7531 USB \u4f9b\u7535\u534f\u8bae\u534f\u5546\u5f97\u5230\u7684\u6570\u636e\u89d2\u8272\u51b3\u5b9a\uff1a<\/p>\n

\u8bbe\u5907 \/ Gadget \u6a21\u5f0f\uff08UFP\uff09\uff1aAndroid \u8bbe\u5907\u4f5c\u4e3a\u5916\u8bbe\u63a5\u5165\u4e3b\u673a\uff08\u901a\u5e38\u662f PC\uff09\u3002\u652f\u6301 MTP \u6587\u4ef6\u4f20\u8f93\u3001ADB \u8c03\u8bd5\u3001PTP \u7167\u7247\u4f20\u8f93\u3001RNDIS \u7f51\u7edc\u5171\u4eab\u3001MIDI\u3001USB \u914d\u4ef6 AOA\u3002\u5185\u6838 USB gadget \u6846\u67b6\uff08configfs\uff09\u5bf9\u5916\u63d0\u4f9b\u590d\u5408 USB \u529f\u80fd\u3002<\/p>\n

\u4e3b\u673a\u6a21\u5f0f\uff08DFP\uff09\uff1aAndroid \u8bbe\u5907\u5145\u5f53 USB \u4e3b\u673a\u3002\u4f1a\u679a\u4e3e\u63a5\u5165\u7684 USB \u5916\u8bbe\uff08\u952e\u76d8\u3001\u9f20\u6807\u3001\u5b58\u50a8\u3001\u97f3\u9891\u8bbe\u5907\uff09\uff0c\u5e76\u901a\u8fc7 UsbManager API \u5411\u5e94\u7528\u63d0\u4f9b\u8bbf\u95ee\u3002<\/p>\n

UsbPortManager \u901a\u8fc7 IUsb HAL \u76d1\u542c\u7aef\u53e3\u72b6\u6001\u53d8\u66f4\uff0c\u534f\u8c03\u4e24\u79cd\u6a21\u5f0f\u4e4b\u95f4\u7684\u5207\u6362\u3002<\/p>\n

39.1.4 UsbManager \u2014\u2014 \u516c\u5f00 API<\/h4>\n

UsbManager\uff08\u6e90\u7801\uff1aframeworks\/base\/core\/java\/android\/hardware\/usb\/UsbManager.java\uff09\u5e26\u6709@SystemService\u6ce8\u89e3\uff0c\u662f\u5e94\u7528\u4e0e USB \u4ea4\u4e92\u7684\u5165\u53e3\u3002\u5b83\u63d0\u4f9b\uff1a<\/p>\n

\u8bbe\u5907 (gadget) \u6a21\u5f0f\u64cd\u4f5c\uff1a<\/p>\n

    \n
  • \u67e5\u8be2\u4e0e\u8bbe\u7f6e\u5f53\u524d USB \u529f\u80fd\uff08MTP\u3001PTP \u7b49\uff09<\/li>\n
  • \u83b7\u53d6 USB \u914d\u4ef6\u4fe1\u606f<\/li>\n
  • \u6253\u5f00 USB \u914d\u4ef6\u8fde\u63a5<\/li>\n<\/ul>\n

    \u4e3b\u673a\u6a21\u5f0f\u64cd\u4f5c\uff1a<\/p>\n

      \n
    • \u679a\u4e3e\u5df2\u8fde\u63a5 USB \u8bbe\u5907\uff08getDeviceList()\uff09<\/li>\n
    • \u8bf7\u6c42\u8bbe\u5907\u901a\u4fe1\u6743\u9650<\/li>\n
    • \u6253\u5f00\u8bbe\u5907\u8fde\u63a5\uff08openDevice()\uff09<\/li>\n<\/ul>\n

      \u529f\u80fd\u5e38\u91cf\u5b9a\u4e49\u53ef\u7528\u7684 gadget \u914d\u7f6e\uff1a<\/p>\n

      \/\/ \u6458\u81eaUsbManager.java \u2014\u2014 \u529f\u80fd\u4f4d\u63a9\u7801
      \npublic static final long FUNCTION_NONE = 0;
      \npublic static final long FUNCTION_MTP = GadgetFunction.MTP; \/\/ 1 << 2
      \npublic static final long FUNCTION_PTP = GadgetFunction.PTP; \/\/ 1 << 4
      \npublic static final long FUNCTION_RNDIS = GadgetFunction.RNDIS; \/\/ 1 << 5
      \npublic static final long FUNCTION_MIDI = GadgetFunction.MIDI; \/\/ 1 << 3
      \npublic static final long FUNCTION_ACCESSORY = GadgetFunction.ACCESSORY; \/\/ 1 << 1
      \npublic static final long FUNCTION_AUDIO_SOURCE = GadgetFunction.AUDIO_SOURCE; \/\/ 1 << 6
      \npublic static final long FUNCTION_ADB = GadgetFunction.ADB; \/\/ 1
      \npublic static final long FUNCTION_NCM = GadgetFunction.NCM; \/\/ 1 << 10
      \npublic static final long FUNCTION_UVC = GadgetFunction.UVC; \/\/ 1 << 7<\/p>\n

      \u8fd9\u4e9b\u5e38\u91cf\u76f4\u63a5\u6620\u5c04 AIDL \u53ef\u5e8f\u5217\u5316\u5bf9\u8c61 GadgetFunction\uff0c\u5b9a\u4e49\u4f4d\u7f6e\uff1ahardware\/interfaces\/usb\/gadget\/aidl\/android\/hardware\/usb\/gadget\/GadgetFunction.aidl\u3002<\/p>\n

      39.1.5 UsbService \u2014\u2014 \u6838\u5fc3\u534f\u8c03\u5668 <\/h4>\n

      UsbService\uff08\u6e90\u7801\uff1aframeworks\/base\/services\/usb\/java\/com\/android\/server\/usb\/UsbService.java\uff09\u5b9e\u73b0 IUsbManager\uff0c\u8fd0\u884c\u5728 system_server \u8fdb\u7a0b\u3002\u5b83\u662f\u6240\u6709 USB \u64cd\u4f5c\u7684 Binder \u670d\u52a1\u7aef\u70b9\uff0c\u5c06\u5de5\u4f5c\u59d4\u6d3e\u7ed9\u5404\u4e2a\u4e13\u7528\u5b50\u7ba1\u7406\u5668\uff1a<\/p>\n

      <\/p>\n

      UsbAuthManager \u4ec5\u5728enableUsbHostAuthorization\u6807\u8bb0\u5f00\u542f\u65f6\u624d\u4f1a\u5b9e\u4f8b\u5316\uff08\u53c2\u8003 UsbService.java \u4e2dmAuthManager = new UsbAuthManager(…)\u9644\u8fd1\u4ee3\u7801\uff09\uff1b\u5b83\u5bf9\u63a5\u72ec\u7acb\u8fdb\u7a0b Rust \u5b88\u62a4\u8fdb\u7a0b\uff0c\u8be6\u89c1 39.10 \u8282\u3002<\/p>\n

      \u670d\u52a1\u751f\u547d\u5468\u671f\u9075\u5faa\u6807\u51c6 SystemService \u6a21\u5f0f\uff1a<\/p>\n

    • \u6784\u9020\u9636\u6bb5\uff1asystem_server \u542f\u52a8\u65f6\u5b9e\u4f8b\u5316 UsbService\u3002<\/li>\n
    • systemReady()\uff1a\u89e6\u53d1\u6240\u6709\u5b50\u7ba1\u7406\u5668\u521d\u59cb\u5316\u3002UsbHostManager \u542f\u52a8\u539f\u751f\u7ebf\u7a0b\u76d1\u542c\/dev\/bus\/usb\u8bbe\u5907\u63d2\u62d4\u4e8b\u4ef6\u3002UsbPortManager \u5411 HAL \u67e5\u8be2\u5f53\u524d\u7aef\u53e3\u72b6\u6001\u3002<\/li>\n
    • \u8fd0\u884c\u9636\u6bb5\uff1a\u5904\u7406\u6765\u81ea\u5e94\u7528\u7684 Binder \u8c03\u7528\uff0c\u5e7f\u64ad USB \u72b6\u6001\u53d8\u66f4\uff0c\u6309\u7528\u6237\u914d\u7f6e\u7ba1\u7406\u6743\u9650\u4e0e\u8bbe\u7f6e\u3002<\/li>\n

      39.1.6 \u7cfb\u7edf\u5c5e\u6027\u4e0e Sysfs \u8def\u5f84 <\/h4>\n

      UsbDeviceManager \u901a\u8fc7\u591a\u4e2a\u5185\u6838\u63a5\u53e3\u4e0e\u7cfb\u7edf\u5c5e\u6027\u76d1\u63a7\u3001\u63a7\u5236 USB \u72b6\u6001\uff1a<\/p>\n\n\n \u63a5\u53e3
      \n \u8def\u5f84
      \n \u7528\u9014
      \n  
      \n  
      \n  
      \n  
      \n  
      \n  
      \n <\/tr>\n\n\n\n\n\n\n\n\n
      USB \u72b6\u6001 sysfs<\/td>\n\/sys\/class\/android_usb\/android0\/state<\/td>\n\u65e7\u7248 gadget \u72b6\u6001<\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n<\/tr>\n
      USB \u529f\u80fd sysfs<\/td>\n\/sys\/class\/android_usb\/android0\/functions<\/td>\n\u65e7\u7248\u529f\u80fd\u914d\u7f6e<\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n<\/tr>\n
      UDC \u63a7\u5236\u5668<\/td>\nsys.usb.controller\uff08\u7cfb\u7edf\u5c5e\u6027\uff09<\/td>\nConfigFS UDC \u540d\u79f0<\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n<\/tr>\n
      USB \u914d\u7f6e<\/td>\npersist.sys.usb.config\uff08\u7cfb\u7edf\u5c5e\u6027\uff09<\/td>\n\u6301\u4e45\u5316 USB \u914d\u7f6e<\/td>\nRNDIS \u5730\u5740<\/td>\n\/sys\/class\/android_usb\/android0\/f_rndis\/ethaddr<\/td>\n\u7f51\u7edc\u5171\u4eab MAC \u5730\u5740<\/td>\nMIDI ALSA<\/td>\n\/sys\/class\/android_usb\/android0\/f_midi\/alsa<\/td>\nMIDI \u8bbe\u5907\u4fe1\u606f<\/td>\n<\/tr>\n
      UEvent \u5339\u914d<\/td>\nDEVPATH=\/devices\/virtual\/android_usb\/android0<\/td>\n\u65e7\u7248\u72b6\u6001\u53d8\u66f4<\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n<\/tr>\n
      UEvent \u5339\u914d<\/td>\nSUBSYSTEM=udc<\/td>\n\u73b0\u4ee3 UDC \u72b6\u6001\u53d8\u66f4<\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n<\/tr>\n
      FunctionFS<\/td>\n\/dev\/usb\u2011ffs\/adb\/<\/td>\nADB FunctionFS \u7aef\u70b9<\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      39.2 UsbDeviceManager\uff1aGadget \u6a21\u5f0f\u72b6\u6001\u673a <\/h3>\n

      39.2.1 \u6982\u8ff0 <\/h4>\n

      UsbDeviceManager\uff08\u6e90\u7801\uff1aframeworks\/base\/services\/usb\/java\/com\/android\/server\/usb\/UsbDeviceManager.java\uff09\u662f USB \u6846\u67b6\u4e2d\u6700\u590d\u6742\u7684\u7ec4\u4ef6\u3002\u5b83\u7ba1\u7406 Android \u8bbe\u5907\u4f5c\u4e3a USB \u5916\u8bbe\u7684\u884c\u4e3a\uff0c\u5904\u7406\u529f\u80fd\u5207\u6362\uff08MTP\u3001PTP\u3001RNDIS\u3001\u914d\u4ef6\u3001MIDI\u3001ADB\uff09\u3001\u7ebf\u7f06\u4e8b\u4ef6\u89e6\u53d1\u7684\u72b6\u6001\u8fc1\u79fb\uff0c\u540c\u65f6\u534f\u8c03\u9501\u5c4f\u72b6\u6001\u3001\u7528\u6237\u504f\u597d\u3001\u5185\u6838\u5c42 USB \u914d\u7f6e\u3002<\/p>\n

      \u8be5\u7c7b\u5b9e\u73b0ActivityTaskManagerInternal.ScreenObserver\uff0c\u7528\u4e8e\u54cd\u5e94\u9501\u5c4f\u72b6\u6001\u53d8\u66f4\u3002\u5173\u952e\u70b9\uff1aMTP \u8bbf\u95ee\u7528\u6237\u5b58\u50a8\u6570\u636e\u8981\u6c42\u8bbe\u5907\u5c4f\u5e55\u5904\u4e8e\u89e3\u9501\u72b6\u6001\u3002<\/p>\n

      39.2.2 \u67b6\u6784 <\/h4>\n

      <\/p>\n

      39.2.3 \u53cc Handler \u7b56\u7565 <\/h4>\n

      UsbDeviceManager \u5728\u6784\u9020\u65f6\u9009\u62e9\u4e24\u79cd\u5177\u4f53 Handler \u5b9e\u73b0\u4e4b\u4e00\uff1a<\/p>\n

      \/\/ \u6458\u81eaUsbDeviceManager\u6784\u9020\u51fd\u6570
      \nif (mUsbGadgetHal == null) {
      \n \/\/ \u521d\u59cb\u5316\u4f20\u7edfUsbHandler
      \n mHandler = new UsbHandlerLegacy(FgThread.get().getLooper(),
      \n mContext, this, alsaManager, permissionManager);
      \n} else {
      \n \/\/ \u521d\u59cb\u5316\u57fa\u4e8eHAL\u7684UsbHandler
      \n mHandler = new UsbHandlerHal(FgThread.get().getLooper(),
      \n mContext, this, alsaManager, permissionManager);
      \n}<\/p>\n

        \n
      • UsbHandlerHal\uff1a\u73b0\u4ee3\u8bbe\u5907\u4f7f\u7528\uff0c\u8bbe\u5907\u5177\u5907 IUsbGadget AIDL HAL\u3002\u8c03\u7528 HAL \u7684setCurrentUsbFunctions()\u8bf7\u6c42\u914d\u7f6e\u53d8\u66f4\uff0cHAL \u5185\u90e8\u5b8c\u6210\u5185\u6838 ConfigFS \u64cd\u4f5c\u3002<\/li>\n
      • UsbHandlerLegacy\uff1a\u65e7\u8bbe\u5907\u65e0 gadget HAL \u65f6\u7684\u56de\u9000\u65b9\u6848\u3002\u76f4\u63a5\u5199 sysfs \u6587\u4ef6\u4e0e\u7cfb\u7edf\u5c5e\u6027\u5207\u6362 USB \u529f\u80fd\u3002<\/li>\n<\/ul>\n

        39.2.4 \u57fa\u4e8e\u6d88\u606f\u7684\u72b6\u6001\u673a <\/h4>\n

        UsbHandler \u901a\u8fc7 Android Handler \u6d88\u606f\u961f\u5217\u5904\u7406 USB \u72b6\u6001\u8fc1\u79fb\u3002\u6240\u6709\u72b6\u6001\u53d8\u66f4\u4e32\u884c\u5728\u524d\u53f0\u7ebf\u7a0b\u6267\u884c\uff0c\u907f\u514d\u7ade\u6001\u6761\u4ef6\u3002<\/p>\n\n\n \u6d88\u606f ID
        \n \u5e38\u91cf
        \n \u89e6\u53d1\u6765\u6e90
        \n <\/tr>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
        0<\/td>\nMSG_UPDATE_STATE<\/td>\n\u5185\u6838\u4e0a\u62a5\u8fde\u63a5 \/ \u65ad\u5f00 \/ \u914d\u7f6e\u5b8c\u6210<\/td>\n<\/tr>\n
        1<\/td>\nMSG_ENABLE_ADB<\/td>\n\u5f00\u53d1\u8005\u9009\u9879\u5f00\u5173 ADB<\/td>\n<\/tr>\n
        2<\/td>\nMSG_SET_CURRENT_FUNCTIONS<\/td>\n\u5e94\u7528\u8bf7\u6c42\u5207\u6362\u529f\u80fd<\/td>\n<\/tr>\n
        3<\/td>\nMSG_SYSTEM_READY<\/td>\nsystem server \u5c31\u7eea<\/td>\n<\/tr>\n
        4<\/td>\nMSG_BOOT_COMPLETED<\/td>\n\u5f00\u673a\u5b8c\u6210\u5e7f\u64ad<\/td>\n<\/tr>\n
        5<\/td>\nMSG_USER_SWITCHED<\/td>\n\u5207\u6362\u5f53\u524d\u7528\u6237<\/td>\n<\/tr>\n
        6<\/td>\nMSG_UPDATE_USER_RESTRICTIONS<\/td>\n\u7528\u6237\u7b56\u7565\u53d8\u66f4<\/td>\n<\/tr>\n
        7<\/td>\nMSG_UPDATE_PORT_STATE<\/td>\nType\u2011C \u7aef\u53e3\u72b6\u6001\u53d8\u66f4<\/td>\n<\/tr>\n
        8<\/td>\nMSG_ACCESSORY_MODE_ENTER_TIMEOUT<\/td>\n\u914d\u4ef6\u534f\u5546 10 \u79d2\u8d85\u65f6<\/td>\n<\/tr>\n
        9<\/td>\nMSG_UPDATE_CHARGING_STATE<\/td>\n\u7535\u6c60\u5145\u7535\u72b6\u6001\u53d8\u66f4<\/td>\n<\/tr>\n
        10<\/td>\nMSG_UPDATE_HOST_STATE<\/td>\n\u4e3b\u673a\u6a21\u5f0f\u8bbe\u5907\u63d2\u62d4<\/td>\n<\/tr>\n
        11<\/td>\nMSG_LOCALE_CHANGED<\/td>\n\u8bed\u8a00\u53d8\u66f4\uff08\u66f4\u65b0\u901a\u77e5\uff09<\/td>\n<\/tr>\n
        12<\/td>\nMSG_SET_SCREEN_UNLOCKED_FUNCTIONS<\/td>\n\u5c4f\u5e55\u89e3\u9501\u65f6\u529f\u80fd\u504f\u597d<\/td>\n<\/tr>\n
        13<\/td>\nMSG_UPDATE_SCREEN_LOCK<\/td>\n\u9501\u5c4f\u663e\u793a \/ \u9690\u85cf<\/td>\n<\/tr>\n
        14<\/td>\nMSG_SET_CHARGING_FUNCTIONS<\/td>\n\u5207\u6362\u81f3\u4ec5\u5145\u7535\u6a21\u5f0f<\/td>\n<\/tr>\n
        15<\/td>\nMSG_SET_FUNCTIONS_TIMEOUT<\/td>\n\u529f\u80fd\u5207\u6362\u8d85\u65f6<\/td>\n<\/tr>\n
        16<\/td>\nMSG_GET_CURRENT_USB_FUNCTIONS<\/td>\n\u67e5\u8be2\u5f53\u524d gadget \u529f\u80fd<\/td>\n<\/tr>\n
        17<\/td>\nMSG_FUNCTION_SWITCH_TIMEOUT<\/td>\ngadget \u91cd\u65b0\u679a\u4e3e\u8d85\u65f6<\/td>\n<\/tr>\n
        18<\/td>\nMSG_GADGET_HAL_REGISTERED<\/td>\nHAL \u670d\u52a1\u5c31\u7eea<\/td>\n<\/tr>\n
        19<\/td>\nMSG_RESET_USB_GADGET<\/td>\n\u91cd\u7f6e gadget \u786c\u4ef6<\/td>\n<\/tr>\n
        20<\/td>\nMSG_ACCESSORY_HANDSHAKE_TIMEOUT<\/td>\nAOA \u63e1\u624b\u8d85\u65f6<\/td>\n<\/tr>\n
        21<\/td>\nMSG_INCREASE_SENDSTRING_COUNT<\/td>\n\u6536\u5230 AOA \u5b57\u7b26\u4e32\u63cf\u8ff0\u7b26<\/td>\n<\/tr>\n
        22<\/td>\nMSG_UPDATE_USB_SPEED<\/td>\nUSB \u901f\u7387\u534f\u5546\u5b8c\u6210<\/td>\n<\/tr>\n
        23<\/td>\nMSG_UPDATE_HAL_VERSION<\/td>\nHAL \u7248\u672c\u4fe1\u606f\u66f4\u65b0<\/td>\n<\/tr>\n
        24<\/td>\nMSG_USER_UNLOCKED_AFTER_BOOT<\/td>\n\u5f00\u673a\u540e\u9996\u6b21\u89e3\u9501<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

        39.2.5 USB \u72b6\u6001\u8fc1\u79fb <\/h4>\n

        \u5185\u6838\u901a\u8fc7 UEvent \u6d88\u606f\u4e0a\u62a5 USB \u72b6\u6001\u53d8\u66f4\u3002UsbUEventObserver \u63a5\u6536\u6d88\u606f\u5e76\u8f6c\u6362\u4e3a Handler \u6d88\u606f\u3002<\/p>\n

        <\/p>\n

        UsbHandler \u7684updateState()\u5c06\u5185\u6838\u72b6\u6001\u5b57\u7b26\u4e32\u6620\u5c04\u4e3a\u5185\u90e8\u72b6\u6001\uff1a<\/p>\n

        \/\/ \u6458\u81eaUsbHandler.updateState()
        \nif (\\”DISCONNECTED\\”.equals(state)) {
        \n connected = 0; configured = 0;
        \n} else if (\\”CONNECTED\\”.equals(state)) {
        \n connected = 1; configured = 0;
        \n} else if (\\”CONFIGURED\\”.equals(state)) {
        \n connected = 1; configured = 1;
        \n}<\/p>\n

        39.2.6 \u529f\u80fd\u5207\u6362 <\/h4>\n

        \u7528\u6237\u6216\u7cfb\u7edf\u8bf7\u6c42\u5207\u6362 USB \u529f\u80fd\u65f6\uff0c\u72b6\u6001\u673a\u6267\u884c\u591a\u6b65\u6d41\u7a0b\uff1a<\/p>\n

        <\/p>\n

        39.2.7 \u9632\u6296\u4e0e\u8d85\u65f6 <\/h4>\n

        \u529f\u80fd\u5207\u6362\u4f1a\u5e26\u6765\u77ed\u6682 USB \u65ad\u5f00\u3002\u72b6\u6001\u673a\u4f1a\u505a\u9632\u6296\u5904\u7406\uff0c\u907f\u514d\u865a\u5047\u65ad\u5f00\u4e8b\u4ef6\u5e72\u6270\u5207\u6362\u6d41\u7a0b\u3002<\/p>\n

        \/\/ UsbDeviceManager\u4e2d\u9632\u6296\u5ef6\u65f6
        \nprivate static final int DEVICE_STATE_UPDATE_DELAY_EXT = 3000; \/\/ 3\u79d2
        \nprivate static final int DEVICE_STATE_UPDATE_DELAY = 1000; \/\/ 1\u79d2
        \nprivate static final int HOST_STATE_UPDATE_DELAY = 1000; \/\/ 1\u79d2
        \nprivate static final int ACCESSORY_REQUEST_TIMEOUT = 10 * 1000; \/\/ 10\u79d2
        \nprivate static final int ACCESSORY_HANDSHAKE_TIMEOUT = 10 * 1000; \/\/ 10\u79d2<\/p>\n

        \u8c03\u7528resetUsbGadget()\u4e4b\u540e\uff0c\u901a\u8fc7mResetUsbGadgetDisableDebounce\u4e34\u65f6\u5173\u95ed\u9632\u6296\uff0c\u4fdd\u8bc1 gadget \u91cd\u7f6e\u540e\u7684\u7b2c\u4e00\u6b21\u65ad\u5f00\u4e8b\u4ef6\u7acb\u5373\u5904\u7406\u3002<\/p>\n

        39.2.8 \u4e0e\u9501\u5c4f\u4ea4\u4e92 <\/h4>\n

        MTP \u9700\u8981\u8bbf\u95ee\u7528\u6237\u5b58\u50a8\uff0c\u9501\u5c4f\u65f6\u5fc5\u987b\u505a\u4fdd\u62a4\u3002UsbDeviceManager \u4e0e\u9501\u5c4f\u6a21\u5757\u534f\u540c\u5de5\u4f5c\uff1a<\/p>\n

      • \u5c4f\u5e55\u9501\u5b9a\uff08onKeyguardStateChanged(true)\uff09\uff0cHandler \u6536\u5230 MSG_UPDATE_SCREEN_LOCK\u3002<\/li>\n
      • \u5982\u679c MTP \u6216 PTP \u5904\u4e8e\u6fc0\u6d3b\u72b6\u6001\uff0cHandler \u5207\u6362\u4e3a\u4ec5\u5145\u7535\u529f\u80fd\u3002<\/li>\n
      • \u7528\u6237\u504f\u597d\u529f\u80fd\u4fdd\u5b58\u5728 SharedPreferences\uff0ckey \u4e3ausb\u2011screen\u2011unlocked\u2011config\u2011<userId>\u3002<\/li>\n
      • \u5c4f\u5e55\u89e3\u9501\u540e\uff0c\u6062\u590d\u4e4b\u524d\u4fdd\u5b58\u7684 USB \u529f\u80fd\u3002<\/li>\n

        39.2.9 \u63a5\u53e3\u9ed1\u540d\u5355 <\/h4>\n

        \u51fa\u4e8e\u5b89\u5168\u8003\u8651\uff0c\u5f53\u8bbe\u5907\u4f5c\u4e3a USB \u4e3b\u673a\u65f6\uff0c\u90e8\u5206 USB \u63a5\u53e3\u7c7b\u7981\u6b62\u5e94\u7528\u8bbf\u95ee\uff1a<\/p>\n

        \/\/ \u6458\u81eaUsbDeviceManager\u9759\u6001\u4ee3\u7801\u5757
        \nsDenyInterfaces.add(UsbConstants.USB_CLASS_AUDIO);
        \nsDenyInterfaces.add(UsbConstants.USB_CLASS_COMM);
        \nsDenyInterfaces.add(UsbConstants.USB_CLASS_HID);
        \nsDenyInterfaces.add(UsbConstants.USB_CLASS_PRINTER);
        \nsDenyInterfaces.add(UsbConstants.USB_CLASS_MASS_STORAGE);
        \nsDenyInterfaces.add(UsbConstants.USB_CLASS_HUB);
        \nsDenyInterfaces.add(UsbConstants.USB_CLASS_CDC_DATA);
        \nsDenyInterfaces.add(UsbConstants.USB_CLASS_CSCID);
        \nsDenyInterfaces.add(UsbConstants.USB_CLASS_CONTENT_SEC);
        \nsDenyInterfaces.add(UsbConstants.USB_CLASS_VIDEO);
        \nsDenyInterfaces.add(UsbConstants.USB_CLASS_WIRELESS_CONTROLLER);<\/p>\n

        39.2.10 MTP \u670d\u52a1\u7ed1\u5b9a <\/h4>\n

        MTP\/PTP \u529f\u80fd\u6fc0\u6d3b\u65f6\uff0cHandler \u7ed1\u5b9a MTP \u670d\u52a1\uff1a<\/p>\n

        \/\/ UsbHandler\u5e38\u91cf
        \nprotected static final String MTP_PACKAGE_NAME = \\”com.android.mtp\\”;
        \nprotected static final String MTP_SERVICE_CLASS_NAME = \\”com.android.mtp.MtpService\\”;<\/p>\n

        ServiceConnection \u5728 MTP \u4f1a\u8bdd\u6574\u4e2a\u751f\u547d\u5468\u671f\u4fdd\u6301\u7ed1\u5b9a\uff1b\u5207\u6362\u79bb\u5f00 MTP\/PTP \u65f6\u89e3\u9664\u7ed1\u5b9a\u3002\u8be5\u7ed1\u5b9a\u9664\u4e86\u542f\u52a8\u670d\u52a1\u5916\u8fd8\u6709\u5173\u952e\u4f5c\u7528\uff1a\u963b\u6b62 ActivityManager \u51bb\u7ed3 MTP \u8fdb\u7a0b\u3002\u5982\u679c\u6ca1\u6709\u7ed1\u5b9a\uff0c\u7cfb\u7edf\u53ef\u80fd\u4e3a\u56de\u6536\u8d44\u6e90\u51bb\u7ed3 MTP \u670d\u52a1\u8fdb\u7a0b\uff0c\u6253\u65ad\u6b63\u5728\u8fdb\u884c\u7684 USB \u4f20\u8f93\u3002<\/p>\n

        <\/p>\n

        39.2.11 MIDI \u529f\u80fd\u63a2\u6d4b <\/h4>\n

        MIDI gadget \u529f\u80fd\u542f\u7528\u540e\uff0cUsbDeviceManager \u9700\u8981\u63a2\u6d4b\u5408\u6210 MIDI \u8bbe\u5907\u5bf9\u5e94\u7684 ALSA \u5361\u53f7\u4e0e\u8bbe\u5907\u53f7\uff0c\u6709\u4e24\u79cd\u5b9e\u73b0\u65b9\u5f0f\u3002<\/p>\n

        \u73b0\u4ee3\u65b9\u6848\uff08\u57fa\u4e8e sysfs \u89e3\u6790\uff09\uff1a<\/p>\n

        \/\/ \u904d\u5386UDC\u63a7\u5236\u5668\u4e0bsysfs\u76ee\u5f55
        \nFile soundDir = new File(\\”\/sys\/class\/udc\/\\” + controllerName + \\”\/gadget\/sound\\”);
        \nFile[] cardDirs = FileUtils.listFilesOrEmpty(soundDir,
        \n (dir, file) -> file.startsWith(\\”card\\”));
        \nFile[] midis = FileUtils.listFilesOrEmpty(cardDirs[0],
        \n (dir, file) -> file.startsWith(\\”midi\\”));<\/p>\n

        \/\/ \u4ece\\”midiC<card>D<device>\\”\u89e3\u6790\u5361\u53f7\u8bbe\u5907\u53f7
        \nPattern pattern = Pattern.compile(\\”midiC(\\\\\\\\d+)D(\\\\\\\\d+)\\”);
        \nMatcher matcher = pattern.matcher(midis[0].getName());
        \nif (matcher.matches()) {
        \n mMidiCard = Integer.parseInt(matcher.group(1));
        \n mMidiDevice = Integer.parseInt(matcher.group(2));
        \n}<\/p>\n

        \u4f20\u7edf\u65b9\u6848\uff08\u8bfb\u53d6 ALSA \u6587\u4ef6\uff09\uff1a<\/p>\n

        \/\/ \u8bfb\u53d6\u65e7\u7248sysfs\u8def\u5f84
        \nScanner scanner = new Scanner(new File(MIDI_ALSA_PATH));
        \nmMidiCard = scanner.nextInt();
        \nmMidiDevice = scanner.nextInt();<\/p>\n

        \u63a2\u6d4b\u5f97\u5230\u7684\u5361\u53f7\u3001\u8bbe\u5907\u53f7\u4f20\u7ed9 UsbAlsaManager\uff0c\u5411 Android MIDI \u670d\u52a1\u6ce8\u518c\u5916\u8bbe MIDI \u8bbe\u5907\u3002<\/p>\n

        39.2.12 USB \u72b6\u6001\u5e7f\u64ad <\/h4>\n

        Handler \u5411\u6240\u6709\u63a5\u6536\u8005\u5e7f\u64ad USB \u72b6\u6001\u53d8\u66f4\uff1a<\/p>\n

        protected void updateUsbStateBroadcastIfNeeded(long functions) {
        \n Intent intent = new Intent(UsbManager.ACTION_USB_STATE);
        \n intent.addFlags(Intent.FLAG_RECEIVER_REPLACE_PENDING
        \n | Intent.FLAG_RECEIVER_INCLUDE_BACKGROUND
        \n | Intent.FLAG_RECEIVER_FOREGROUND);
        \n intent.putExtra(UsbManager.USB_CONNECTED, mConnected);
        \n intent.putExtra(UsbManager.USB_HOST_CONNECTED, mHostConnected);
        \n intent.putExtra(UsbManager.USB_CONFIGURED, mConfigured);
        \n intent.putExtra(UsbManager.USB_DATA_UNLOCKED,
        \n isUsbTransferAllowed() && isUsbDataTransferActive(mCurrentFunctions));<\/p>\n

        \/\/ \u6dfb\u52a0\u6fc0\u6d3b\u529f\u80fd\u6807\u8bb0
        \n long remainingFunctions = functions;
        \n while (remainingFunctions != 0) {
        \n intent.putExtra(UsbManager.usbFunctionsToString(
        \n Long.highestOneBit(remainingFunctions)), true);
        \n remainingFunctions -= Long.highestOneBit(remainingFunctions);
        \n }<\/p>\n

        \/\/ \u4ec5\u72b6\u6001\u771f\u6b63\u53d8\u5316\u624d\u5e7f\u64ad
        \n if (!isUsbStateChanged(intent)) return;
        \n sendStickyBroadcast(intent);
        \n}<\/p>\n

        ACTION_USB_STATE\u662f\u7c98\u6027\u5e7f\u64ad\uff1a\u665a\u6ce8\u518c\u7684\u63a5\u6536\u8005\u4f1a\u7acb\u523b\u6536\u5230\u4e0a\u4e00\u6b21\u5e7f\u64ad\u72b6\u6001\u3002Intent \u643a\u5e26\u5404\u4e2a\u6fc0\u6d3b\u529f\u80fd\u7684\u5e03\u5c14\u503c\uff0c\u63a5\u6536\u65b9\u53ef\u4ee5\u5355\u72ec\u68c0\u67e5\u67d0\u4e00\u4e2a\u529f\u80fd\u72b6\u6001\u3002<\/p>\n

        39.2.13 \u7528\u6237\u9650\u5236\u6267\u884c <\/h4>\n

        \u4f01\u4e1a\u7ba1\u63a7\u8bbe\u5907\u53ef\u901a\u8fc7UserManager.DISALLOW_USB_FILE_TRANSFER\u9650\u5236 USB \u6587\u4ef6\u4f20\u8f93\uff1a<\/p>\n

        protected boolean isUsbTransferAllowed() {
        \n UserManager userManager = (UserManager) mContext.getSystemService(
        \n Context.USER_SERVICE);
        \n return !userManager.hasUserRestriction(
        \n UserManager.DISALLOW_USB_FILE_TRANSFER);
        \n}<\/p>\n

        \u8be5\u9650\u5236\u751f\u6548\u65f6\uff1a<\/p>\n

          \n
        • MTP\u3001PTP \u529f\u80fd\u88ab\u5c4f\u853d<\/li>\n
        • USB \u901a\u77e5\u663e\u793a \u201c\u4ec5\u5145\u7535\u201d<\/li>\n
        • \u5e94\u7528\u65e0\u6cd5\u5207\u6362\u81f3\u6570\u636e\u4f20\u8f93\u529f\u80fd<\/li>\n<\/ul>\n

          39.2.14 AOA \u914d\u4ef6\u63e1\u624b\u8ddf\u8e2a <\/h4>\n

          Handler \u8bb0\u5f55 AOA \u63e1\u624b\u8fc7\u7a0b\u8be6\u7ec6\u65f6\u5e8f\u4fe1\u606f\uff0c\u7528\u4e8e\u8c03\u8bd5\u4e0e\u7edf\u8ba1\uff1a<\/p>\n

          private long mAccessoryConnectionStartTime = 0L; \/\/ \u6536\u5230GET_PROTOCOL\u65f6\u523b
          \nprivate int mSendStringCount = 0; \/\/ SEND_STRING uevent\u8ba1\u6570
          \nprivate boolean mStartAccessory = false; \/\/ \u662f\u5426\u6536\u5230START<\/p>\n

          \/\/ \u5e7f\u64ad\u63e1\u624b\u8be6\u60c5\u7528\u4e8e\u8c03\u8bd5
          \nprivate void broadcastUsbAccessoryHandshake() {
          \n Intent intent = new Intent(UsbManager.ACTION_USB_ACCESSORY_HANDSHAKE)
          \n .putExtra(UsbManager.EXTRA_ACCESSORY_UEVENT_TIME,
          \n mAccessoryConnectionStartTime)
          \n .putExtra(UsbManager.EXTRA_ACCESSORY_STRING_COUNT,
          \n mSendStringCount)
          \n .putExtra(UsbManager.EXTRA_ACCESSORY_START,
          \n mStartAccessory)
          \n .putExtra(UsbManager.EXTRA_ACCESSORY_HANDSHAKE_END,
          \n SystemClock.elapsedRealtime());
          \n sendStickyBroadcast(intent);
          \n}<\/p>\n

          39.2.15 RNDIS \u7f51\u7edc\u5171\u4eab\u96c6\u6210 <\/h4>\n

          RNDIS\uff08USB \u7f51\u7edc\u5171\u4eab\uff09\u6fc0\u6d3b\u65f6\uff1a<\/p>\n

        • Handler \u914d\u7f6e RNDIS gadget \u529f\u80fd\u3002<\/li>\n
        • \u57fa\u4e8ero.serialno\u751f\u6210\u672c\u5730\u7ba1\u7406 MAC \u5730\u5740\uff1a<\/li>\n

          \/\/ \u9996\u5b57\u8282\u8bbe0x02\uff0c\u8868\u793a\u672c\u5730\u7ba1\u7406\u5730\u5740
          \naddress[0] = 0x02;
          \nString serial = SystemProperties.get(\\”ro.serialno\\”, \\”1234567890ABCDEF\\”);
          \n\/\/ USB\u5e8f\u5217\u53f7\u5f02\u6216\u586b\u5145\u5269\u4f595\u5b57\u8282
          \nfor (int i = 0; i < serialLength; i++) {
          \n address[i % (ETH_ALEN – 1) + 1] ^= (int) serial.charAt(i);
          \n}<\/p>\n","protected":false},"excerpt":{"rendered":"

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