Added key bindings in message view

import android.text.util.Regex;

import android.util.Config;

import android.util.Log;

import android.view.KeyEvent;

import android.view.LayoutInflater;

import android.view.Menu;

import android.view.MenuItem;

    private Listener mListener = new Listener();

    private MessageViewHandler mHandler = new MessageViewHandler();

       public boolean onKeyDown(int keyCode, KeyEvent event) {

        switch (keyCode) {

            case KeyEvent.KEYCODE_DEL: { onDelete(); break;}

            case KeyEvent.KEYCODE_F: { onForward(); break;}

            case KeyEvent.KEYCODE_A: { onReplyAll(); break; }

            case KeyEvent.KEYCODE_R: { onReply(); break; }

            case KeyEvent.KEYCODE_J: { onPrevious(); break; }

            case KeyEvent.KEYCODE_K: { onNext(); break; }

            }

        return true;

        }

    class MessageViewHandler extends Handler {

        private static final int MSG_PROGRESS = 2;

        private static final int MSG_ADD_ATTACHMENT = 3;

            msg.arg1 = show ? 1 : 0;

            sendMessage(msg);

        }

    }

    class Attachment {