没有调用BroadcastReceiver的onReceive方法

Question

I know there are many SO posts related to this topic but none is working here.

I am doing sendBroadcast call from the class UserEntry.java: ---

final Intent intent = new Intent(DeviceScanActivity.ACTION_DISCONNECTED);
intent.putExtra(DeviceScanActivity.EXTRAS_DEVICE_NAME, bdDevice.getName());
intent.putExtra(DeviceScanActivity.EXTRAS_DEVICE_ADDRESS,  bdDevice.getAddress());
getActivity().sendBroadcast(intent);

I have defined my broadcast receiver in class DeviceScanActivity.java: as ---

private final BroadcastReceiver mUpdateReceiver = 
new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            final String action = intent.getAction();
            device_name = intent.getExtras().getString(DeviceScanActivity.
            EXTRAS_DEVICE_NAME);
            device_address = intent.getExtras().getString(DeviceScanActivity.
            EXTRAS_DEVICE_ADDRESS);
            if (ACTION_CONNECTED.equals(action)) {
                mConnected = "Connected";
                invalidateOptionsMenu();
            } else if (ACTION_DISCONNECTED.equals(action)) {
                mConnected = "Disconnected";
                invalidateOptionsMenu();
            } else if (ACTION_CONNECTING.equals(action)) {
                mConnected = "Connecting";
                invalidateOptionsMenu();
            }
            else
            {
                mConnected = "";
                invalidateOptionsMenu();
            }
        }
    };

@Override
    protected void onResume() {
        super.onResume();

        registerReceiver(mUpdateReceiver, makeUpdateIntentFilter());
}

 @Override
    protected void onPause() {
        super.onPause();
        unregisterReceiver(mUpdateReceiver);
}

So, user clicks connect button and sendBroadcast is called from class UserEntry then user switch to class DeviceScanActivity and still onReceive is never get called.

Answer 1

You are registering the BroadcastReceiver in DeviceScanActivity.java which means it won't be registered until DeviceScanActivity is active.

In other words the broadcast will simply get lost because there isn't a receiver available to receive the broadcast.