Neardi PI3 RK3576 Android14 如何支持 MTP 功能

neardi

MTP（Media Transfer Protocol）是常用的文件传输协议，接上 Typec 到PC就可以直接访问设备存储。

源码中USB模式由 UsbDeviceManager 控制，修改补丁如下：

rk3576_neardi_Android14/frameworks/base$

diff --git a/services/usb/java/com/android/server/usb/UsbDeviceManager.java b/services/usb/java/com/android/server/usb/UsbDeviceManager.java
index 3d012f6eacc0..36b36527fdb7 100644
--- a/services/usb/java/com/android/server/usb/UsbDeviceManager.java
+++ b/services/usb/java/com/android/server/usb/UsbDeviceManager.java
@@ -1010,7 +1010,7 @@ public class UsbDeviceManager implements ActivityTaskManagerInternal.ScreenObser
                                     && mScreenUnlockedFunctions != UsbManager.FUNCTION_NONE) {
                                 setScreenUnlockedFunctions(operationId);
                             } else {
-                                setEnabledFunctions(UsbManager.FUNCTION_NONE, false, operationId);
+                                setEnabledFunctions(UsbManager.FUNCTION_MTP, false, operationId);
                             }
                         }
                         updateUsbFunctions();
@@ -1263,7 +1263,7 @@ public class UsbDeviceManager implements ActivityTaskManagerInternal.ScreenObser
                         && mScreenUnlockedFunctions != UsbManager.FUNCTION_NONE) {
                     setScreenUnlockedFunctions(operationId);
                 } else {
-                    setEnabledFunctions(UsbManager.FUNCTION_NONE, false, operationId);
+                    setEnabledFunctions(UsbManager.FUNCTION_MTP, false, operationId);
                 }
                 if (mCurrentAccessory != null) {
                     mUsbDeviceManager.getCurrentSettings().accessoryAttached(mCurrentAccessory);

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