title: android home key Response Process
body: <p>There are some question about android HOME key on android4.2 !</p>
  
  <ul>
  <li>add Log at KeyEvent.java$getKeyCode()</li>
  <li>adb logcat &amp; press the home key</li>
  </ul>
  
  <p>output keyCode = <code>122</code> !
  but the HOME keyCode is 3
  and the MOVE_HOME keycode is <code>122</code>
  so,I can't use the home key !</p>
  
  <p>compareed the files under /frameworks/base/data/keyboards/ with a normal,it is the same!</p>
  
  <ul>
  <li>How the home key working?</li>
  <li>How many times about the key mappings?(from Linux kernel -- driver -- frameworks)</li>
  <li>How the maps relation(Linux kernel -- driver -- frameworks)</li>
  </ul>