1.SmartRefreshLayout介绍
SmartRefreshLayout的目标是打造一个强大，稳定，成熟的下拉刷新框架，并集成各种的炫酷、多样、实用、美观的Header和Footer。 正如名字所说，SmartRefreshLayout是一个“聪明”或者“智能”的下拉刷新布局，由于它的“智能”，它不只是支持所有的View，还支持多层嵌套的视图结构。 它继承自ViewGroup 而不是FrameLayout或LinearLayout，提高了性能。 也吸取了现在流行的各种刷新布局的优点，包括谷歌官方的 SwipeRefreshLayout， 其他第三方的 Ultra-Pull-To-Refresh、TwinklingRefreshLayout 。 还集成了各种炫酷的 Header 和 Footer。
2.使用步骤
(1)在 build.gradle (app)中添加依赖
implementation 'com.scwang.smartrefresh:SmartRefreshLayout:1.1.0-alpha-26'
implementation 'com.scwang.smartrefresh:SmartRefreshHeader:1.1.0-alpha-26'//没有使用特殊Header，可以不加这行
implementation 'com.android.support:design:28.0.0'
(2)布局文件(使用SmartRefreshLayout和RecyclerView)
<?xml version="1.0" encoding="utf-8"?>
<com.scwang.smartrefresh.layout.SmartRefreshLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/refreshLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="@+id/my_recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:overScrollMode="never"
android:scrollbars="vertical"
android:background="#fff" /> </com.scwang.smartrefresh.layout.SmartRefreshLayout>
(3)RecyclerView的item布局
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content" > <TextView
android:id="@+id/text"
android:layout_width="wrap_content"
android:layout_height="60dp"
android:layout_centerHorizontal="true"
android:layout_marginTop="28dp"
android:textSize="16sp"
android:textStyle="bold"
android:text="hehe"/> </RelativeLayout>
(4)java后台
package com.example.administrator.test65smartrefreshlayout; import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.DividerItemDecoration;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView; import com.scwang.smartrefresh.header.MaterialHeader;
import com.scwang.smartrefresh.layout.api.RefreshLayout;
import com.scwang.smartrefresh.layout.constant.SpinnerStyle;
import com.scwang.smartrefresh.layout.footer.BallPulseFooter;
import com.scwang.smartrefresh.layout.listener.SimpleMultiPurposeListener; import java.util.ArrayList; public class MainActivity extends AppCompatActivity { RecyclerView mRecyclerView;
MyAdapter mAdapter;
LinearLayoutManager mLayoutManager;
RefreshLayout refreshLayout; @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView(); mRecyclerView = findViewById(R.id.my_recycler_view);
mLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLayoutManager);
mRecyclerView.addItemDecoration(new DividerItemDecoration(this, LinearLayoutManager.VERTICAL));
mRecyclerView.setHasFixedSize(true);
mAdapter = new MyAdapter(getDatas());
mRecyclerView.setAdapter(mAdapter);
} private void initView() {
refreshLayout = findViewById(R.id.refreshLayout);
/**
* 设置不同的头部、底部样式
*/
// refreshLayout.setRefreshFooter(new ClassicsFooter(this).setSpinnerStyle(SpinnerStyle.Scale));
// refreshLayout.setRefreshHeader(new BezierRadarHeader(this));
// refreshLayout.setRefreshHeader(new TwoLevelHeader(this));
refreshLayout.setRefreshFooter(new BallPulseFooter(this).setSpinnerStyle(SpinnerStyle.Scale)); refreshLayout.setRefreshHeader(new MaterialHeader(this).setShowBezierWave(true)); //设置样式后面的背景颜色
refreshLayout.setPrimaryColorsId(R.color.colorPrimary, android.R.color.white); //设置监听器，包括顶部下拉刷新、底部上滑刷新
refreshLayout.setOnMultiPurposeListener(new SimpleMultiPurposeListener(){ @Override
public void onRefresh(@NonNull RefreshLayout refreshLayout) {
mAdapter.refreshData(MoreDatas()); //下拉刷新，数据从上往下添加到界面上
refreshLayout.finishRefresh(1000); //这个记得设置，否则一直转圈
} @Override
public void onLoadMore(@NonNull RefreshLayout refreshLayout) {
mAdapter.loadMore(MoreDatas()); //上滑刷新，数据从下往上添加到界面上
refreshLayout.finishLoadMore(1000); //这个记得设置，否则一直转圈
}
}); } //原始的recyclerView数据
private ArrayList<String> getDatas() {
ArrayList<String> data = new ArrayList<>();
String temp = " item";
for(int i = 0; i < 15; i++) {
data.add(i + temp);
}
return data;
} //刷新得到的数据
private ArrayList<String> MoreDatas() {
ArrayList<String> data = new ArrayList<>();
String temp = "新加数据 ";
for(int i = 0; i < 6; i++) {
data.add(temp + i);
}
return data;
} public static class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> { public ArrayList<String> datas = null; public MyAdapter(ArrayList<String> datas) {
this.datas = datas;
} //创建新View，被LayoutManager所调用
@Override
public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.recyclerview_smartrefreshlayout_item,viewGroup,false);
ViewHolder vh = new ViewHolder(view);
return vh;
} //将数据与界面进行绑定的操作
@Override
public void onBindViewHolder(ViewHolder viewHolder, int position) {
viewHolder.mTextView.setText(datas.get(position));
} //获取数据的数量
@Override
public int getItemCount() {
return datas.size();
} //底部上拉刷新，数据直接在底部显示
public void loadMore(ArrayList<String> strings) {
datas.addAll(strings);
notifyDataSetChanged();
} //底部下拉刷新，数据直接从上往下添加数据，显示在顶部
public void refreshData(ArrayList<String> strings) {
datas.addAll(0, strings);
notifyDataSetChanged();
// notifyItemInserted(0); 一次只能加一项数据
} //自定义的ViewHolder，持有每个Item的的所有界面元素
public static class ViewHolder extends RecyclerView.ViewHolder {
public TextView mTextView;
public ViewHolder(View view){
super(view);
mTextView = view.findViewById(R.id.text);
}
}
}
}
3.效果图
