title: How to pass message to Bluetooth Activity from another activity
body: <p><br/><br/>
  I build an Android app that control RC car. This app have two activities, Bluetooth Activity and Direction Activity.<br/></p>
  
  <p>In Bluetooth activity I used list view to list all the devices and connect with one. I used the two class provided by Android <a href="http://developer.android.com/guide/topics/connectivity/bluetooth.html" rel="nofollow">"ConnectThread" and "ConnectedThread"</a>. My main job is to only send character to the RC car to move. This character is generated by the Direction Activity which use Acceleration sensor to generate a character.</p>
  
  <p><strong>Problems:</strong><br/><br/>
  1. how to send character from the Direction Activity to the Bluetooth activity?<br/>
  2. After the Bluetooth Activity received the character how to send it over the Bluetooth connection?<br/>
  3. Do I need the two classes "ConnectThread" and "ConnectedThread" to connect and send or just one of them?<br/><br/></p>
  
  <p>PS. I am beginner and I have tried many things like intent, shared Preference, and Bundle. But every time I try an error occur.</p>