看到了Android版知乎实现了这种效果，就自己也实现了一下。

先来一张效果图

swipeRefrsh.gif

实现方式：

方法一、

①在onWindowFocusChanged()方法中，设置为刷新状态为true

@Override
    public void onWindowFocusChanged(boolean hasFocus) {
        super.onWindowFocusChanged(hasFocus);
        mSwipeRefreshLayout.setRefreshing(true);
    }

②在获取数据完成后设置刷新状态为false

if (mSwipeRefreshLayout.isRefreshing()) {
                            mSwipeRefreshLayout.setRefreshing(false);
                        }

方法二、

①调用mSwipeRefreshLayout.measure()方法后，设置刷新状态为true

//手动调用,通知系统去测量
        mSwipeRefreshLayout.measure(0,0);
        mSwipeRefreshLayout.setRefreshing(true);

②在获取数据完成后设置刷新状态为false

if (mSwipeRefreshLayout.isRefreshing()) {
                            mSwipeRefreshLayout.setRefreshing(false);
                        }

方法三、

①在view.post(new Runnable)方法中设置刷新状态为true

mSwipeRefreshLayout.post(new Runnable() {
            @Override
            public void run() {
                Log.i("getMeasuredHeight",mSwipeRefreshLayout.getMeasuredHeight()+"");
                mSwipeRefreshLayout.setRefreshing(true);
            }
        });

②在获取数据完成后设置刷新状态为false

if (mSwipeRefreshLayout.isRefreshing()) {
                            mSwipeRefreshLayout.setRefreshing(false);
                        }

<br />

方法四、

①使用ViewTreeObserver

        ViewTreeObserver obeser=mSwipeRefreshLayout.getViewTreeObserver();
        obeser.addOnWindowFocusChangeListener(new ViewTreeObserver.OnWindowFocusChangeListener() {
            @Override
            public void onWindowFocusChanged(boolean hasFocus) {
                mSwipeRefreshLayout.setRefreshing(true);
                Log.i("11getMeasuredHeight",mSwipeRefreshLayout.getMeasuredHeight()+"");
            }
        });

②在获取数据完成后设置刷新状态为false

if (mSwipeRefreshLayout.isRefreshing()) {
                            mSwipeRefreshLayout.setRefreshing(false);
                        }

说明：

每种方法的第一步，都是为了保证SwipeRefreshLayout绘制完成，再调用方法显示刷新球，否则界面比较的复杂的时候，刷新球会不显示。

源码：https://github.com/RaphetS/swiperefreshdemo