Android系统插上USB线后，如何默认设置为MTP文件传输

Android系统插上USB线后，

如何默认设置为MTP文件传输

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按如下方式修改

 …/com/android/server/usb/UsbDeviceManager.java   | 26 +++++++++++++++++—–
 1 file changed, 21 insertions(+), 5 deletions(-)

diff –git a/frameworks/base/services/usb/java/com/android/server/usb/UsbDeviceManager.java b/frameworks/base/services/usb/java/com/android/server/usb/UsbDeviceManager.java
index 
— a/frameworks/base/services/usb/java/com/android/server/usb/UsbDeviceManager.java
+++ b/frameworks/base/services/usb/java/com/android/server/usb/UsbDeviceManager.java
@@  @@ public class UsbDeviceManager {

         private boolean mConnected;
         private boolean mHostConnected;
  &nb