/**     * Indicate that the connection was lost and notify the UI Activity.     */    private void connectionLost() {        // Send a failure message back to the Activity        Message msg = mHandler.obtainMessage(BluetoothChat.MESSAGE_TOAST);        Bundle bundle = new Bundle();        bundle.putString(BluetoothChat.TOAST, "Device connection was lost");        msg.setData(bundle);        mHandler.sendMessage(msg);        // Start the service over to restart listening mode        BluetoothChatService.this.start();    }

　　// The Handler that gets information back from the BluetoothChatService    private final Handler mHandler = new Handler() {        @Override        public void handleMessage(Message msg) {            switch (msg.what) {            case MESSAGE_STATE_CHANGE:                if(D) Log.i(TAG, "MESSAGE_STATE_CHANGE: " + msg.arg1);                switch (msg.arg1) {                case BluetoothChatService.STATE_CONNECTED:                    setStatus(getString(R.string.title_connected_to, mConnectedDeviceName));                    mConversationArrayAdapter.clear();                    break;                case BluetoothChatService.STATE_CONNECTING:                    setStatus(R.string.title_connecting);                    break;                case BluetoothChatService.STATE_LISTEN:                case BluetoothChatService.STATE_NONE:                    setStatus(R.string.title_not_connected);                    break;                }                break;            case MESSAGE_WRITE:                byte[] writeBuf = (byte[]) msg.obj;                // construct a string from the buffer                String writeMessage = new String(writeBuf);                mConversationArrayAdapter.add("Me:  " + writeMessage);                break;            case MESSAGE_READ:                byte[] readBuf = (byte[]) msg.obj;                // construct a string from the valid bytes in the buffer                String readMessage = new String(readBuf, 0, msg.arg1);                mConversationArrayAdapter.add(mConnectedDeviceName+":  " + readMessage);                break;            case MESSAGE_DEVICE_NAME:                // save the connected device‘s name                mConnectedDeviceName = msg.getData().getString(DEVICE_NAME);                Toast.makeText(getApplicationContext(), "Connected to "                               + mConnectedDeviceName, Toast.LENGTH_SHORT).show();                break;            case MESSAGE_TOAST:                Toast.makeText(getApplicationContext(), msg.getData().getString(TOAST),                               Toast.LENGTH_SHORT).show();                break;            }        }    };