RecyclerView+SwipeRefreshLayout+ViewPager实现上拉加载更多下拉刷新和添加Banner（附源码）
1.概述
在本文中，我们实现RecyclerView+SwipeRefreshLayout+ViewPager实现上拉加载更多下拉刷新,并添加Banner（首页轮播图）。具体步骤如下：
（1）RecyclerView添加SwipeRefreshLayout；
（2）RecyclerView添加ViewPager（轮播图）；
（3）解决RecyclerView添加头部不显示问题；
（4）解决ViewPager和SwipeRefreshLayout滑动冲突问题；
2.实战
（1）RecyclerView添加SwipeRefreshLayout
布局
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/rl_viewPager"
android:layout_width="match_parent"
android:layout_height="180dp"
android:background="#FFFFFF">
<com.chunsoft.csdn_example.DecoratorViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="180dp" />
<LinearLayout
android:id="@+id/ll_dot"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginBottom="8dp"
android:gravity="center"
android:orientation="horizontal" />
RelativeLayout>DecoratorViewPager是重写了ViewPager拦截父Viewgroup动作，具体看我这篇文章（http://blog.csdn.net/ztchun/article/details/52988826）。
监听RecyclerView滑动，实现上拉加载更多
//监听RecyclerView滑动，实现上拉加载更多
private RecyclerView.OnScrollListener mOnScrollListener = new RecyclerView.OnScrollListener() {
private int lastVisibleItem;
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
if (newState == RecyclerView.SCROLL_STATE_IDLE
&& lastVisibleItem == adapter.getItemCount()){
//延迟发送，模拟
showProgress();
myHandler.sendEmptyMessageDelayed(REFRESH_COMPLETE,2000);
}
}
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
lastVisibleItem = mLayoutManager.findLastVisibleItemPosition();
}
};实现SwipeRefreshLayout.OnRefreshListener接口，实现下拉刷新
@Override
public void onRefresh() {
showProgress();
myHandler.sendEmptyMessageDelayed(REFRESH_LRARN,2000);
}（2）RecyclerView添加ViewPager（轮播图）
需要重写RecyclerView这个View增加在其中添加HeaderView和FooterView的功能。
package com.chunsoft.csdn_example;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.view.ViewPager;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.Toast;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
public class MainActivity extends AppCompatActivity implements SwipeRefreshLayout.OnRefreshListener{
private static final int REFRESH_COMPLETE = 0X110;
private static final int REFRESH_LRARN = 0X111;
private SwipeRefreshLayout mSwipeRefreshLayout;
private XRecycleView mRecyclerView;
//Add Header
private View mHeadViewer;
private DecoratorViewPager mPager;
private LinearLayoutManager mLayoutManager;
private LinearLayout mLlDot;
private ArrayList mImgList;
private int curIndex = 0;
private ViewPagerAdapter myPagerAdapter;
private HomeAdapter adapter;
private List mDatas;
public void showProgress() {
mSwipeRefreshLayout.setRefreshing(true);
}
public void hideProgress() {
mSwipeRefreshLayout.setRefreshing(false);
adapter.isShowFooter(false);
}
private MyHandler myHandler = new MyHandler(this);
private static class MyHandler extends Handler {
private WeakReference weakReference; //用弱引用防止造成OOM
public MyHandler(Context context){
weakReference = new WeakReference<>(context);
}
public void handleMessage(android.os.Message msg) {
MainActivity activity = (MainActivity)weakReference.get();
switch (msg.what)
{
case REFRESH_COMPLETE:
if(activity!=null){
activity.mDatas.addAll(Arrays.asList("上拉数据1", "上拉数据2", "上拉数据3"));
activity.adapter.notifyDataSetChanged();
}
activity.hideProgress();
break;
case REFRESH_LRARN:
if(activity!=null){
activity.mDatas.addAll(Arrays.asList("下拉数据1", "下拉数据2", "下拉数据3"));
activity.adapter.notifyDataSetChanged();
activity.mSwipeRefreshLayout.setRefreshing(false);
}
activity.hideProgress();
break;
}
}
}
private RecyclerView.OnScrollListener mOnScrollListener = new RecyclerView.OnScrollListener() {
private int lastVisibleItem;
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
if (newState == RecyclerView.SCROLL_STATE_IDLE
&& lastVisibleItem == adapter.getItemCount()){
//延迟发送，模拟
showProgress();
myHandler.sendEmptyMessageDelayed(REFRESH_COMPLETE,2000);
}
}
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
lastVisibleItem = mLayoutManager.findLastVisibleItemPosition();
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mSwipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.refresh);
//设置swipe加载样式
mSwipeRefreshLayout.setColorSchemeColors(
getResources().getColor(android.R.color.holo_blue_bright),
getResources().getColor(android.R.color.holo_green_light),
getResources().getColor(android.R.color.holo_orange_light),
getResources().getColor(android.R.color.holo_red_light));
mRecyclerView = (XRecycleView) findViewById(R.id.recycle_view);
initData();
initView();
initEvent();
}
private void initEvent() {
mSwipeRefreshLayout.setOnRefreshListener(this);
mRecyclerView.addOnScrollListener(mOnScrollListener);
mRecyclerView.setAdapter(adapter);
mPager.setAdapter(myPagerAdapter);
adapter.setOnItemClickListtener(mOnItemClickListtener);
}
private void initView()
{
mHeadViewer = LayoutInflater.from(this).inflate(R.layout.home_header,null);
//顶部ViewPager
mPager = (DecoratorViewPager) mHeadViewer.findViewById(R.id.viewpager);
mPager.setNestedpParent((ViewGroup)mPager.getParent());
//屏蔽ViewPager事件和SwipeRefreshLayout事件冲突
mPager.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_MOVE:
mSwipeRefreshLayout.setEnabled(false);
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
mSwipeRefreshLayout.setEnabled(true);
break;
}
return false;
}
});
mLlDot = (LinearLayout) mHeadViewer.findViewById(R.id.ll_dot);
setOvalLayout();
//mRecyclerView.setHasFixedSize(true);
mLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLayoutManager);
mRecyclerView.setItemAnimator(new DefaultItemAnimator());
mRecyclerView.addHeaderView(mHeadViewer);
adapter = new HomeAdapter(this,mDatas);
myPagerAdapter = new ViewPagerAdapter(this,mImgList);
}
private void initData()
{
mDatas = new ArrayList<>(Arrays.asList("C", "C++", "HTML", "JAVA", "Objective-C",
"javascript", "JSP/servelet", "ASP.net", "数据结构", "Oracle"));
mImgList = new ArrayList();
mImgList.add(R.drawable.gao0);
mImgList.add(R.drawable.gao1);
mImgList.add(R.drawable.gao2);
mImgList.add(R.drawable.gao3);
mImgList.add(R.drawable.gao4);
}
/**
* 设置圆点
*/
private void setOvalLayout(){
for(int i = 0;i < 5;i++){
mLlDot.addView(LayoutInflater.from(this).inflate(R.layout.dot,null));
}
// 默认显示第一页
mLlDot.getChildAt(0).findViewById(R.id.v_dot)
.setBackgroundResource(R.drawable.dot_selected);
mPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener(){
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
//取消圆点选中
mLlDot.getChildAt(curIndex)
.findViewById(R.id.v_dot)
.setBackgroundResource(R.drawable.dot_normal);
mLlDot.getChildAt(position)
.findViewById(R.id.v_dot)
.setBackgroundResource(R.drawable.dot_selected);
curIndex = position;
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
}
@Override
public void onRefresh() {
showProgress();
myHandler.sendEmptyMessageDelayed(REFRESH_LRARN,2000);
}
@Override
protected void onDestroy() {
super.onDestroy();
myHandler.removeCallbacksAndMessages(null);
}
private HomeAdapter.OnItemClickListener mOnItemClickListtener = new HomeAdapter.OnItemClickListener() {
@Override
public void onItemClick(View view, int position) {
Toast.makeText(view.getContext(),"点击："+position,Toast.LENGTH_LONG).show();
Log.e("---------->","点击："+position);
}
};
}
这个模块参考我这篇文章。（http://blog.csdn.net/ztchun/article/details/52988969）
（3）解决RecyclerView添加头部不显示问题
经常我们写好添加头部的代码后发现头部不显示，主要原因在显示界面前，头部内容为空。我的解决思路是：
设置头部为固定长度，当然为了适配可以根据设备实际大小在activity中动态设置。
（4）解决ViewPager和SwipeRefreshLayout滑动冲突问题
ViewPager左右滑动和SwipeRefreshLayout上下滑动会有冲突，使界面滑动不流畅，具体解决方案如下：
//顶部ViewPager
mPager = (DecoratorViewPager) mHeadViewer.findViewById(R.id.viewpager);
mPager.setNestedpParent((ViewGroup)mPager.getParent());
//屏蔽ViewPager事件和SwipeRefreshLayout事件冲突
mPager.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_MOVE:
mSwipeRefreshLayout.setEnabled(false);
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
mSwipeRefreshLayout.setEnabled(true);
break;
}
return false;
}
});这部分详情参考：http://blog.csdn.net/ztchun/article/details/52988826
源码链接：http://download.csdn.net/detail/zhoutaochun/9674763