SwipeRefreshLayout基本用法

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布局文件引入控件（SwipeRefreshLayout是一个ViewGroup，内部一般放RecyclerView之类的控件）

```    <android.support.v4.widget.SwipeRefreshLayout            android:id="@+id/swipeRefreshLayout"            android:layout_width="match_parent"            android:layout_height="match_parent">            <android.support.v7.widget.RecyclerView                android:id="@+id/recyclerView"                android:layout_width="match_parent"                android:layout_height="match_parent" />        </android.support.v4.widget.SwipeRefreshLayout>```

代码中

        SwipeRefreshLayout swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipeRefreshLayout);         //★1.设置刷新时动画的颜色，可以设置4个        swipeRefreshLayout.setColorSchemeResources(android.R.color.holo_blue_light,                android.R.color.holo_red_light, android.R.color.holo_orange_light,                android.R.color.holo_green_light);        //★2.设置刷新监听事件        swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {            @Override            public void onRefresh() {                handler.sendEmptyMessageDelayed(REFRESH_COMPLETE, 2000);            }        });        private Handler handler = new Handler() {            @Override            public void handleMessage(Message msg) {                super.handleMessage(msg);                switch (msg.what) {                    case REFRESH_COMPLETE:                        urls.removeAll(urls);                        urls.add(url11);                        urls.add(url12);                        urls.add(url13);                        urls.add(url14);                        urls.add(url15);                        urls.add(url16);                        urls.add(url17);                        urls.add(url18);                        urls.add(url19);                        urls.add(url20);                        //★3.通知recycleView改变了数据                        myAdapter.notifyDataSetChanged();                        //★4.记得关闭刷新，否则刷新球一直在转                        swipeRefreshLayout.setRefreshing(false);                        break;                }            }        };

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