Hi, I'm studying Android Browser and wanna know how request messages
are sent.
  Please help me to find out the mechanism of sending and receiving
messages.

  For instance, let's say I tapped a 'Refresh' item in menu.
  I'd found the flow of request message like as below.

   BrowserActivity.onOptionsItemSelected ()
   -> WebView.reload ()
   -> WebViewCore.sendMessage ()
   -> EventHub.sendMessage ()
   -> Handler.sendMessage ()
   -> Handler.sendMessageDelayed ()
   -> Handler.sendMessageAtTime ()
   -> MessageQueue.enqueueMessage ()
   -> notify ().

  This was all. I still can't find where and who gets the message
  and requests the telephony layer to make and send data packets.

  Please, if anybody knows, let me know where to study as in detail as
possible.

  Thanks.

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