Android USB Host. How do I get permission to use USB devices without displaying a dialog?

问题

There android device without a screen. When connecting the USB device automatically appears the system dialog to permit the use of USB. It is necessary to obtain a permit without using the device's screen. It is assumed that the device application will be installed in advance, and when the USB device is connected automatically.

How exactly this can be done?

回答1:

I made by analogy in the topic. Classes for the correct version of SDK took away. I create the necessary packages and copied to the specified and missing classes. The application should be copied into the folder system/priv-app and all earned.

回答2:

Add to activity in manifest file

<activity ...>
    ...
    <intent-filter>
        <action android:name="android.hardware.usb.action.USB_ACCESSORY_ATTACHED" />
    </intent-filter>

    <meta-data android:name="android.hardware.usb.action.USB_ACCESSORY_ATTACHED"
        android:resource="@xml/accessory_filter" />
</activity>

Create file with params of your usb device in res/xml

<?xml version="1.0" encoding="utf-8"?>

<resources>
    <usb-accessory manufacturer="Google, Inc." model="DemoKit" version="1.0" />
</resources>

Fore more information see https://developer.android.com/guide/topics/connectivity/usb/accessory.html

来源：https://stackoverflow.com/questions/31315355/android-usb-host-how-do-i-get-permission-to-use-usb-devices-without-displaying