上拉加载下拉刷新

老方法，先上效果图：

1.加入下拉刷新 上拉加载的依赖

//下拉刷新 上拉加载
implementation 'com.scwang.smartrefresh:SmartRefreshLayout:1.0.4-7'
implementation 'com.scwang.smartrefresh:SmartRefreshHeader:1.0.4-7'

2.控件的布局文件代码，以下的LinearLayout是内容部分，直接替换即可。

<com.scwang.smartrefresh.layout.SmartRefreshLayout
        android:id="@+id/srl_control"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:srlAccentColor="@color/colorTransparent"
        app:srlPrimaryColor="@color/colorTransparent"
        app:srlEnablePreviewInEditMode="true">

        <com.scwang.smartrefresh.layout.header.ClassicsHeader
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>


        <LinearLayout
            android:background="@color/colorTheme"
            android:layout_width="match_parent"
            android:layout_height="610dp"/>

        <com.scwang.smartrefresh.layout.footer.ClassicsFooter
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>

    </com.scwang.smartrefresh.layout.SmartRefreshLayout>

3.下拉和上拉的事件我封装在私有类中，直接在onCreate调用该类

private void initSmartRefresh(){
        //下拉刷新
        refreshLayout.setOnRefreshListener(new OnRefreshListener() {
            @Override
            public void onRefresh(RefreshLayout refreshlayout) {
                refreshlayout.setEnableRefresh(true); //启用刷新
                //刷新的事件逻辑
                try {
                    Thread.sleep(3000);
                    refreshlayout.finishRefresh();//结束刷新
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        });

        //上拉加载
        refreshLayout.setOnLoadmoreListener(new OnLoadmoreListener() {
            @Override
            public void onLoadmore(RefreshLayout refreshlayout) {
                refreshlayout.setEnableLoadmore(true);//启用加载
                //加载的事件逻辑
                try {
                    Thread.sleep(3000);
                    refreshlayout.finishLoadmore(); //结束加载
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        });
    }