How to detect a connected USB device using UsbManager?

Question

I am new to Android programming, my main goal is to exchange data via USB to the MCU using FT200XD USB for I2C bridge.

First, I try to detect a connected USB device through UsbManager. From what I understand, when creating a pop-up window, you should ask permission to connect from the user, but permission is not requested. When debugging it, it is clear that the control is not part of the broadcast receiver section.

I cited a few snippets of code and wrote the code below. I do not know what I am doing wrong.

I downloaded an application called "USB Host Controller" that detects the FT200XD. This means that my tablet has USB host features. It will be great if you can point me in the right direction or a common working code can be shared.

My code is as follows:

Java file:

     @Override
    protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);

       setContentView(R.layout.activity_fullscreen);


        mUsbManager = (UsbManager) getSystemService(Context.USB_SERVICE);

        mPermissionIntent= PendingIntent.getBroadcast(this, 0, new  Intent(ACTION_USB_PERMISSION), 0); 
        IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);
        filter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED);
        filter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);
        filter.addAction(UsbManager.EXTRA_PERMISSION_GRANTED);
        filter.addAction(ACTION_USB_PERMISSION);
        registerReceiver(mUsbReceiver, filter);

        }



 // Broadcast receiver

        public class  mUsbReceiver extends BroadcastReceiver { 

            public void onReceive(Context context, Intent intent) {


                Toast.makeText(getApplicationContext(), 
                  "Inside USB Broadcast", Toast.LENGTH_SHORT).show();

            }
        }

Part of the manifest file:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.usb"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="12"
        android:targetSdkVersion="19" />

     <uses-feature android:name="android.hardware.usb.host" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >

         <receiver android:name="mUsbReceiver">

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

            </intent-filter>
         </receiver>

        <activity
            android:name="com.example.usb.FullscreenActivity"
            android:configChanges="orientation|keyboardHidden|screenSize"
            android:label="@string/app_name"
            android:theme="@style/FullscreenTheme" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>

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


        </activity>
    </application>

</manifest>

Device_filter.xml file:

    <?xml version="1.0" encoding="utf-8"?>
     <resources>
    <!-- 0x0403 / 0x6001: FTDI FT232R UART -->
    <usb-device vendor-id="1027" product-id="24577" />

    <!-- 0x2341 / Arduino -->
    <usb-device vendor-id="9025" />

    <!-- 0x16C0 / 0x0483: Teensyduino  -->
    <usb-device vendor-id="5824" product-id="1155" />

    <!-- 0x617 / 0x000b: EFPL CC2531 -->
    <usb-device vendor-id="1559" product-id="11" />

    <!-- vendor-id="0x0403" product-id="0x6015" // converted to Int vendor ID and product ID of my FT200XD-->
     <usb-device vendor-id="1027" product-id="24597" />

</resources>

Answer 1

, registerReceiver - , , , , mUsbReceiver. , , , , , BroadcastReceiver, , , :

PendingIntent mPermissionIntent = null; 
UsbManager mUsbManager = null;

private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {

    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        UsbDevice usbDevice = (UsbDevice)intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
        if (ACTION_USB_PERMISSION.equals(action)) {
            // Permission requested
            synchronized (this) {
                if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false)) {
                    // User has granted permission
                    // ... Setup your UsbDeviceConnection via mUsbManager.openDevice(usbDevice) ...
                } else {
                    // User has denied permission
                }
            }
        }
        if (UsbManager.ACTION_USB_DEVICE_DETACHED.equals(action)) {
            // Device removed
            synchronized (this) {
                // ... Check to see if usbDevice is yours and cleanup ...
            }
        }
        if (UsbManager.ACTION_USB_DEVICE_ATTACHED.equals(action)) {
            // Device attached
            synchronized (this) {
                // Qualify the new device to suit your needs and request permission
                if ((usbDevice.getVendorId() == MY_VID) && (usbDevice.getProductId() == MY_PID)) {
                    mUsbManager.requestPermission(usbDevice, mPermissionIntent);
                }
            }
        }
    }
};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    if (savedInstanceState == null) {
        getSupportFragmentManager().beginTransaction()
                .add(R.id.container, new PlaceholderFragment()).commit();
    }

    // ... App Specific Setup Here ...

    mUsbManager = (UsbManager)getSystemService(Context.USB_SERVICE);

    // Register an intent filter so we can get permission to connect
    // to the device and get device attached/removed messages
    mPermissionIntent = PendingIntent.getBroadcast(this, 0, new Intent(ACTION_USB_PERMISSION), 0);
    IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);
    filter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED);
    filter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);
    registerReceiver(mUsbReceiver, filter);

    // ... More App Specific Setup ...
}

- , XML- USB.