Service和IntentService中显示Toast的区别

    private void showToastByRunnable(final IntentService context, final CharSequence text, final int duration)     {
        Handler handler = new Handler(Looper.getMainLooper());
        handler.post(new Runnable() {
            @Override
            public void run() {
                Toast.makeText(context, text, duration).show();
            }
        });
    }

    Handler msgHandler = new Handler(Looper.getMainLooper()) {
        @Override
        public void handleMessage(Message msg) {
            Toast.makeText(ToastIntentService.this, msg.getData().getString("Text"), Toast.LENGTH_SHORT).show();
            super.handleMessage(msg);
        }
    };
    private void showToastByMsg(final IntentService context, final CharSequence text, final int duration) {
        Bundle data = new Bundle();
        data.putString("Text", text.toString());
        Message msg = new Message();
        msg.setData(data);
        msgHandler.sendMessage(msg);
    }