Android Question Capturing USB_ATTACHED event

yo3ggx · Dec 14, 2018

I have an application using USB/Serial and USB audio devices. In the manifest.xml file I have the following section, used to make the app start when a specific USB serial device is connected:

B4X:

AddActivityText(main, <intent-filter>
        <action android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" />
    </intent-filter>
    <meta-data android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED"
        android:resource="@xml/device_filter" />)

Then the resource file is created from manifest.xml too:

B4X:

CreateResource(xml, device_filter.xml,
<resources>
    <!-- 0x0403 / 0x6015: FTDI FT230XS UART -->
    <usb-device vendor-id="1027" product-id="24597" />
    
</resources>
)

In the main code, I'm using BroadcastReceiver library to capture the following events:

B4X:

        Broadcast.addAction("android.hardware.usb.action.USB_DEVICE_DETACHED")
        Broadcast.addAction("android.hardware.usb.action.USB_DEVICE_ATTACHED")

I need this to handle the situations when USB devices are connected/disconnected when the application is running. UNfortunately because USB_DEVICE_ATTACHED event is captured through the manifest file, the BroadcastReceiver even is no more triggered inside the app for the same event, only for USB_DEVICE_DETACHED

What can I do to capture this event from the app code?

Thank you.
Dan

Erel · Dec 16, 2018

Don't add the dynamic filter.

Try this:

Add this code:

B4X:

#if Java
public void _OnNewIntent(Object intent) {
   BA.Log("" + intent);
}
#end if

Do you see the message in the logs when you connect or disconnect a USB device?

yo3ggx · Dec 16, 2018

If I don't add the filter in the manifest file, the event is triggered in BroadcastReceiver even without the java code.
If I keep the USB_DEVICE_ATTACHED filter in manifest file, this event is no more captured in BroadcastReceiver, only the
USB_DEVICE_DETACHED is.
If I remove the event from manifest, then I'm asked to approve USB device each time I connect it, even if I choose to accept it always by default.

yo3ggx · Dec 16, 2018

There is any other way to capture the event when audio goes from local speaker to the USB audio? This can solve my problem too, as I don't need to capture in my app when USB Serial device is connected, only when USB audio device is.

Erel · Dec 16, 2018

I understand. Have you tried my suggestion?

yo3ggx · Dec 16, 2018

I've commented the following lines in manifest:

B4X:

'AddActivityText(main, <intent-filter>
'        <action android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" />
'    </intent-filter>
'    <meta-data android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED"
'        android:resource="@xml/device_filter" />)

Then I've added the java code you provided, but nothing is logged when connecting or disconnecting USB device. I'm not yet familiar with inline java code. I have to put it in a specific place? I have to comment BroadcastReceiver too?

Erel · Dec 16, 2018

Dynamic filter = BroadcastReciever (in the code).

1. Keep the filter you added with the manifest editor.
2. Add the code I posted to the main activity at the bottom.

yo3ggx · Dec 16, 2018

Done. Nothing logged when I attach the USB device.

Erel · Dec 16, 2018

You can use another activity to handle the intent. Start the main activity when the second activity is resumed.

B4X:

AddActivityText(SecondActivity, <intent-filter>...

This way the second activity will be resumed whenever the intent is intercepted.

Android Question Capturing USB_ATTACHED event

yo3ggx

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Erel

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Android Question Capturing USB_ATTACHED event

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