android 拦截按键 改变按键

@Override
public boolean dispatchKeyEvent(KeyEvent event) {
   if (event.getAction() == KeyEvent.ACTION_DOWN) {
      if (event.getKeyCode() == KeyEvent.KEYCODE_DPAD_LEFT) {
         KeyEvent keyEvent = new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_DPAD_UP);
         simulateKey(keyEvent);

         return true;
      } else if (event.getKeyCode() == KeyEvent.KEYCODE_DPAD_RIGHT) {
         KeyEvent keyEvent = new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_DPAD_DOWN);
         simulateKey(keyEvent);
         return true;
      }
   }

   return super.dispatchKeyEvent(event);
}

public void simulateKey(final KeyEvent keyCode) {

   new Thread() {
      @Override
      public void run() {
         try {
            InputMethodManager systemService = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
            systemService.dispatchKeyEventFromInputMethod(getRootView(), keyCode);
         } catch (Exception e) {

         }
      }

   }.start();

}