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PullToRefresh

开源地址：https://github.com/open-android/PullToRefresh

PS：如果觉得文章太长，你也可观看该课程的视频，亲，里面还有高清，无码的福利喔

运行效果

pulltorefresh.gif

黑马助手.png

使用步骤

1. 添加依赖

//在项目下的build.gradle
allprojects {
	repositories {
		...
		maven { url 'https://jitpack.io' }
	}
}

//在app模块下的build.gradle
dependencies {
        compile 'com.github.open-android:PullToRefresh:v1.0'
}

2. 在布局中添加PullToRefreshListView

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <com.itheima.pulltorefreshlib.PullToRefreshListView
        android:id="@+id/pull_to_refresh_list_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
</RelativeLayout>

3. 设置Adapter

private ArrayAdapter mArrayAdapter;
private PullToRefreshListView mPullToRefreshListView;

mPullToRefreshListView = (PullToRefreshListView) findViewById(R.id.pull_to_refresh_list_view);
mArrayAdapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, mockList(0, 30));
mPullToRefreshListView.setAdapter(mArrayAdapter);

4. 添加模拟数据

private ArrayList<String> mItems = new ArrayList<String>();
/**
 * 创建或动态添加测试用的数据列表
 * @param start 数据的起始位置
 * @param count 数据的个数
 * @return 当前的数据列表
 */
private List<String> mockList(int start, int count) {
    for (int i = start; i < start + count; i++) {
        mItems.add("黑马程序员:" + i);
    }
    return mItems;
}

5. 设置模式

//设置模式BOTH: 既能上拉也能下拉，
 mPullToRefreshListView.setMode(PullToRefreshBase.Mode.BOTH);

6. 设置监听

//设置刷新监听
mPullToRefreshListView.setOnRefreshListener(mListViewOnRefreshListener2);

private PullToRefreshBase.OnRefreshListener2<ListView> mListViewOnRefreshListener2 = new PullToRefreshBase.OnRefreshListener2<ListView>() {

        /**
         * 下拉刷新回调
         * @param refreshView
         */
        @Override
        public void onPullDownToRefresh(PullToRefreshBase<ListView> refreshView) {
            //模拟延时三秒刷新
            mPullToRefreshListView.postDelayed(new Runnable() {
                @Override
                public void run() {
                    mItems.clear();
                    mockList(0, 20);
                    mArrayAdapter.notifyDataSetChanged();
                    mPullToRefreshListView.onRefreshComplete();//下拉刷新结束，下拉刷新头复位

                }
            }, 3000);
        }

        /**
         * 上拉加载更多回调
         * @param refreshView
         */
        @Override
        public void onPullUpToRefresh(PullToRefreshBase<ListView> refreshView) {
            //模拟延时三秒加载更多数据
            mPullToRefreshListView.postDelayed(new Runnable() {
                @Override
                public void run() {
                    mockList(mItems.size(), 20);
                    mArrayAdapter.notifyDataSetChanged();
                    mPullToRefreshListView.onRefreshComplete();//上拉加载更多结束，上拉加载头复位
                }
            }, 3000);
        }
    };