Android apps can't read and write USB device solutions

Suppose the API or APK in the Android system cannot read and write to the USB device. may not be added to read and write USB permissions, you need to follow such as the following methods to set up:

1. Include the following in the android.hardware.usb.host.xml file, for example

<permissions>

<featurename="android.hardware.usb.host"/>

</permissions>

2. In tablet_core_hardware. XML file, such as the following :

<feature name="Android.hardware.usb.host" >

3. Compile system.img again. and burn the firmware and restart the machine.

Android apps can't read and write USB device solutions