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POBroadcastReceiver fires after the activity is already created
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  1. POBroadcastReceiver fires after the activity is already created
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    copied!<p>I want to use a BroadcastReceiver to get permission to communicate with a USB device. I am trying to implement it the same way it is done on android website <a href="http://developer.android.com/guide/topics/usb/host.html" rel="nofollow">http://developer.android.com/guide/topics/usb/host.html</a> It all works, kind of. But the broadcastReceiver is fireing only after the main activity is created. Which means I am able to communicate with the device only after close the app and open it again (when I don't unregister the broadcastReceiver, when I do I can't communicate at all). What can be the reason? My code is like this:</p> <p>private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {</p> <pre><code> public void onReceive(Context context, Intent intent) { String action = intent.getAction(); if (ACTION_USB_PERMISSION.equals(action)) { synchronized (this) { device = (UsbDevice) intent.getParcelableExtra(UsbManager.EXTRA_DEVICE); if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false)) { if(device != null) { //things I do when the permission is granted } } else { devMessage = "permission denied for device "; } } } } }; </code></pre> <p>The part of the code where I register it:</p> <p>public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); </p> <pre><code> mUsbManager = (UsbManager) getSystemService(Context.USB_SERVICE); mPermissionIntent = PendingIntent.getBroadcast(this, 0, new Intent(ACTION_USB_PERMISSION), 0); filter = new IntentFilter(ACTION_USB_PERMISSION); registerReceiver(mUsbReceiver, filter); HashMap&lt;String, UsbDevice&gt; deviceList = mUsbManager.getDeviceList(); Iterator&lt;UsbDevice&gt; deviceIterator = deviceList.values().iterator(); while(deviceIterator.hasNext()) { device = deviceIterator.next(); mUsbManager.requestPermission(device, mPermissionIntent); } // ... if(device!=null) { // ... } else { // ... } tv.setText(devMessage); } </code></pre> <p>Does anyone know why is this happening, what I might be doing wrong?</p>
 

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