这篇文章给大家介绍如何在Android项目中使用RecyclerView实现上拉或下拉刷新功能，内容非常详细，感兴趣的小伙伴们可以参考借鉴，希望对大家能有所帮助。
首页布局：activity_notice
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/white"
android:orientation="vertical"
>
<include layout="@layout/toolbar" />
<android.support.v4.widget.SwipeRefreshLayout
android:id="@+id/SwipeRefreshLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical"></android.support.v7.widget.RecyclerView>
</android.support.v4.widget.SwipeRefreshLayout>
</android.support.design.widget.CoordinatorLayout>
子item布局：item_base
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="@dimen/margin_10"
android:layout_marginRight="@dimen/margin_10"
android:layout_marginTop="6dp"
android:orientation="vertical"
app:cardBackgroundColor="@color/line"
app:cardPreventCornerOverlap="true"
app:cardUseCompatPadding="true"
app:contentPadding="6dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="@+id/tv_date"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2016-10-9 10:00" />
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
app:cardBackgroundColor="@color/white"
app:cardPreventCornerOverlap="true"
app:cardUseCompatPadding="true"
app:contentPadding="10dp">
<TextView
android:id="@+id/tv_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ellipsize="end"
android:maxLines="2"
android:text="。。。，看到这个场景。我看着她她看着我，说道：“怎么样，我当年的手工还不错吧。。。。。。。。。”" />
</android.support.v7.widget.CardView>
</LinearLayout>
</android.support.v7.widget.CardView>脚布局 item_foot
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="40dp"
android:gravity="center"
android:orientation="horizontal"
android:id="@+id/ll"
>
<ProgressBar
android:layout_marginRight="6dp"
android:id="@+id/progressBar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center" />
<TextView
android:id="@+id/tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="@string/loading" />
</LinearLayout>toolbar
<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/blueStatus"
android:minHeight="?attr/actionBarSize"
app:layout_scrollFlags="scroll|enterAlways"
app:navigationIcon="?attr/homeAsUpIndicator"
app:theme="@style/Theme.AppCompat.NoActionBar">
</android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>首页 MainActivity
package com.lxl.refresh;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.View;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import butterknife.ButterKnife;
import butterknife.InjectView;
/**
* Description：
* Author：lxl
* Date： 2016/10/9 10:15
*/
public class MainActivity extends AppCompatActivity {
@InjectView(R.id.toolbar)
Toolbar toolbar;
@InjectView(R.id.recyclerView)
RecyclerView recyclerView;
@InjectView(R.id.SwipeRefreshLayout)
SwipeRefreshLayout swipeRefreshLayout;
boolean isSlidingToLast = false; //判断滚动状态
boolean isLoading;
private List<Map<String, Object>> data = new ArrayList<>();
private RecyclerViewAdapter adapter = new RecyclerViewAdapter(this, data);
private Handler handler = new Handler();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_notice);
ButterKnife.inject(this);
initView();
Map<String, Object> map = new HashMap<>();
initData();
}
public void initView() {
setSupportActionBar(toolbar);
toolbar.setTitle(R.string.notice);
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
finish();
}
});
swipeRefreshLayout.setColorSchemeResources(R.color.blueStatus);
swipeRefreshLayout.post(new Runnable() {
@Override
public void run() {
swipeRefreshLayout.setRefreshing(true);
}
});
swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
handler.postDelayed(new Runnable() {
@Override
public void run() {
data.clear();
getData();
}
}, 2000);
}
});
final LinearLayoutManager layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setAdapter(adapter);
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
Log.d("test", "StateChanged = " + newState); //滑动状态改变时触发有0,1,2三种状态
}
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
if (dy > 0) {
//大于0表示正在向下滚动
isSlidingToLast = true;
} else {
//小于等于0表示停止或向上滚动
isSlidingToLast = false;
}
Log.d("test", "onScrolled"); //当RecyclerView滑动时触发类似点击事件的MotionEvent.ACTION_MOVE
int lastVisibleItemPosition = layoutManager.findLastVisibleItemPosition();
if (lastVisibleItemPosition + 1 == adapter.getItemCount()&& isSlidingToLast) {
Log.d("test", "loading executed");//当且仅当滑动到最后一项并且手指上拉抛出时才执行
boolean isRefreshing = swipeRefreshLayout.isRefreshing();
Log.d("test", "hahh"+isRefreshing);
if (isRefreshing) { //如何在下拉刷新则隐藏脚布局并且返回
adapter.notifyItemRemoved(adapter.getItemCount());
return;
}
if (!isLoading) {
isLoading = true;
handler.postDelayed(new Runnable() {
@Override
public void run() {
getData(); //延时执行加载
Log.d("test", "load more completed");
isLoading = false;
}
}, 1000);
}
}
}
});
//添加点击事件
adapter.setOnItemClickListener(new RecyclerViewAdapter.OnItemClickListener() {
@Override
public void onItemClick(View view, int position) {
Log.d("test", "item position = " + position);
}
@Override
public void onItemLongClick(View view, int position) {
}
});
}
public void initData() { //第一次进来的时候加载数据
handler.postDelayed(new Runnable() {
@Override
public void run() {
getData();
}
}, 1500);
}
/**
* 获取测试数据
*/
private void getData() {
for (int i = 0; i < 6; i++) { //每次加载六条数据
Map<String, Object> map = new HashMap<>();
data.add(map);
}
adapter.notifyDataSetChanged();
swipeRefreshLayout.setRefreshing(false); //加载数据后收起下拉刷新
Log.d("test", adapter.getItemCount()+"");
// adapter.notifyItemRemoved(adapter.getItemCount()); //加载数据后上拉刷新的脚布局移除掉
// adapter.footerHolder.ll.setVisibility(View.GONE);
//加载数据后上拉刷新的脚布局隐藏掉
adapter.setmCreateViewHolder(new RecyclerViewAdapter.onHolderCreate() {
@Override
public void created() {
if (isSlidingToLast==false){
adapter.footerHolder.ll.setVisibility(View.GONE);
}else{
adapter.footerHolder.ll.setVisibility(View.VISIBLE);
}
}
});
}
}在第106行中通过这三个条件判断就可以下拉刷新的执行。
RecyclerView的适配器：RecyclerViewAdapter
package com.lxl.refresh;
import android.content.Context;
import android.support.v7.widget.RecyclerView.Adapter;
import android.support.v7.widget.RecyclerView.ViewHolder;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.TextView;
import java.util.List;
public class RecyclerViewAdapter extends Adapter<ViewHolder> {
private static final int TYPE_ITEM = 0;
private static final int TYPE_FOOTER = 1;
private Context context;
private List data;
protected FootViewHolder footerHolder;
public RecyclerViewAdapter(Context context, List data) {
this.context = context;
this.data = data;
}
//-------------------------------------
public interface onHolderCreate{ //定义一个viewholder回调接口
void created();
}
public onHolderCreate getmCreateViewHolder() {
return mCreateViewHolder;
}
public void setmCreateViewHolder(onHolderCreate mCreateViewHolder) {
this.mCreateViewHolder = mCreateViewHolder;
}
private onHolderCreate mCreateViewHolder;
//-------------------------------------
public interface OnItemClickListener {
void onItemClick(View view, int position);
void onItemLongClick(View view, int position);
}
private OnItemClickListener onItemClickListener;
public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
this.onItemClickListener = onItemClickListener;
}
@Override
public int getItemCount() {
return data.size() == 0 ? 0 : data.size() + 1; //添加脚布局
}
@Override
public int getItemViewType(int position) {
if (position + 1 == getItemCount()) {
return TYPE_FOOTER; //脚布局
} else {
return TYPE_ITEM; //普通item
}
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
if (viewType == TYPE_ITEM) { //创建普通类型的item布局
View view = LayoutInflater.from(context).inflate(R.layout.item_base, parent,
false);
Log.d("test", "创建普通类型的item布局");
return new ItemViewHolder(view);
} else if (viewType == TYPE_FOOTER) { //创建脚布局类型的item布局
View view = LayoutInflater.from(context).inflate(R.layout.item_foot, parent,
false);
footerHolder=new FootViewHolder(view);
Log.d("test", "创建脚布局类型的item布局");
return footerHolder;
}
return null;
}
@Override
public void onBindViewHolder(final ViewHolder holder, int position) {
//在onCreateViewHolder执行完成后回调
if (holder instanceof FootViewHolder){
if (mCreateViewHolder!=null){
mCreateViewHolder.created();
}
}
if (holder instanceof ItemViewHolder) {
//holder.tv.setText(data.get(position));
if (onItemClickListener != null) {
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int position = holder.getLayoutPosition();
onItemClickListener.onItemClick(holder.itemView, position);
}
});
holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
int position = holder.getLayoutPosition();
onItemClickListener.onItemLongClick(holder.itemView, position);
return false;
}
});
}
}
}
static class ItemViewHolder extends ViewHolder {
TextView tv;
public ItemViewHolder(View view) {
super(view);
tv = (TextView) view.findViewById(R.id.tv_date);
}
}
class FootViewHolder extends ViewHolder {
LinearLayout ll;
ProgressBar pb;
TextView tv;
public FootViewHolder(View view) {
super(view);
ll=(LinearLayout) view.findViewById(R.id.ll);
pb=(ProgressBar) view.findViewById(R.id.progressBar);
tv=(TextView) view.findViewById(R.id.tv);
}
}
}在第30行定义一个借口用来通知下拉刷新后隐藏脚布局，主要在onCreateViewHolder执行完成后回调。
关于如何在Android项目中使用RecyclerView实现上拉或下拉刷新功能就分享到这里了，希望以上内容可以对大家有一定的帮助，可以学到更多知识。如果觉得文章不错，可以把它分享出去让更多的人看到。
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