使用SwipeRefreshLayout和RecyclerView实现仿“简书”下拉刷新和上拉加载更多
2016-12-05 13:46
666 查看
本篇博客介绍的是如何使用SwipeRefreshLayout和RecyclerView实现高仿简书Android端的下拉刷新和上拉加载更多的效果。
根据效果图可以发现,本案例实现了如下效果:
第一次进入页面显示SwipeRefreshLayout的下拉刷新效果
当内容铺满屏幕时,向下滑动显示“加载中…”效果并加载更多数据
当SwipeRefreshLayout正在下拉刷新时,将屏蔽加载更多操作
当加载更多数据时,屏蔽有可能的重复的上拉操作
当向上滑动RecyclerView时,隐藏Toolbar以获得更好的用户体验
MainActivity
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[/code]
RecyclerViewAdapter
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[/code]
item_base.xml
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[/code]
item_foot.xml
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上拉加载更多数据通过监听RecyclerView的滚动事件RecyclerView.OnScrollListener()实现的,它提供了两个方法:
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RecyclerView的滑动状态有如下三种:
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由于简书APP的上拉加载更多的是在滑动到最后一个item时自动触发的,与手指是否在屏幕上无关,即与滑动状态无关。因此,实现这种效果只需要在public void onScrolled(RecyclerView recyclerView, int dx, int dy) 方法中操作,无需关注当时的滑动状态:
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[/code]
如果要实现当且仅当滑动到最后一项并且手指上拉抛出时才执行上拉加载更多效果的话,需要配合onScrollStateChanged(RecyclerView recyclerView, int newState的使用,可以将代码改为:
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[/code]
加载更多的效果可以通过item_foot.xml自定义,滑动到最后一项时显示该item并执行加载更多,当加载数据完毕时需要将该item移除掉
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下面的代码就是RecyclerView的多个item布局的实现方法:
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[/code]
该案例源码:https://github.com/leoleohan/RefreshDemo,欢迎Star、Fork。
根据效果图可以发现,本案例实现了如下效果:
第一次进入页面显示SwipeRefreshLayout的下拉刷新效果
当内容铺满屏幕时,向下滑动显示“加载中…”效果并加载更多数据
当SwipeRefreshLayout正在下拉刷新时,将屏蔽加载更多操作
当加载更多数据时,屏蔽有可能的重复的上拉操作
当向上滑动RecyclerView时,隐藏Toolbar以获得更好的用户体验
二、代码实现
MainActivitypackage com.leohan.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; /** * @author Leo */ public class MainActivity extends AppCompatActivity { @InjectView(R.id.toolbar) Toolbar toolbar; @InjectView(R.id.recyclerView) RecyclerView recyclerView; @InjectView(R.id.SwipeRefreshLayout) SwipeRefreshLayout swipeRefreshLayout; boolean isLoading; private List<Map<String, Object>> data = new ArrayList<>(); private MyAdapter adapter = new MyAdapter(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(); 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); } @Override public void onScrolled(RecyclerView recyclerView, int dx, int dy) { super.onScrolled(recyclerView, dx, dy); Log.d("test", "onScrolled"); int lastVisibleItemPosition = layoutManager.findLastVisibleItemPosition(); if (lastVisibleItemPosition + 1 == adapter.getItemCount()) { Log.d("test", "loading executed"); boolean isRefreshing = swipeRefreshLayout.isRefreshing(); if (isRefreshing) { adapter.notifyItemRemoved(adapter.getItemCount()); return; } if (!isLoading) { isLoading = true; handler.postDelayed(new Runnable() { @Override public void run() { getData(); Log.d("test", "load more completed"); isLoading = false; } }, 1000); } } } }); //添加点击事件 adapter.setOnItemClickListener(new MyAdapter.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() { 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++) { Map<String, Object> map = new HashMap<>(); data.add(map); } adapter.notifyDataSetChanged(); swipeRefreshLayout.setRefreshing(false); adapter.notifyItemRemoved(adapter.getItemCount()); } }1
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[/code]
RecyclerViewAdapter
package com.leohan.refresh; import android.content.Context; import android.support.v7.widget.RecyclerView.Adapter; import android.support.v7.widget.RecyclerView.ViewHolder; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; 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; 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; } @Override public int getItemViewType(int position) { if (position + 1 == getItemCount()) { return TYPE_FOOTER; } else { return TYPE_ITEM; } } public RecyclerViewAdapter(Context context, List data) { this.context = context; this.data = data; } @Override public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { if (viewType == TYPE_ITEM) { View view = LayoutInflater.from(context).inflate(R.layout.item_notice, parent, false); return new ItemViewHolder(view); } else if (viewType == TYPE_FOOTER) { View view = LayoutInflater.from(context).inflate(R.layout.item_foot, parent, false); return new FootViewHolder(view); } return null; } @Override public void onBindViewHolder(final ViewHolder holder, int position) { 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); } } static class FootViewHolder extends ViewHolder { public FootViewHolder(View view) { super(view); } } }1
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[/code]
item_base.xml
<?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:foreground="?android:attr/selectableItemBackgroundBorderless" 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" style="@style/NormalTextView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="2015-12-11 12:00" /> <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" style="@style/SmallGreyTextView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:ellipsize="end" android:maxLines="2" android:text="视线好转,0729出口开通,0621进口开通。视线好转,0729出口开通,0621进口开通。" /> </android.support.v7.widget.CardView> </LinearLayout> </android.support.v7.widget.CardView>1
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[/code]
item_foot.xml
<?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" > <ProgressBar android:layout_marginRight="6dp" android:id="@+id/progressBar" style="?android:attr/progressBarStyleSmall" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" /> <TextView style="@style/SmallGreyTextView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:text="@string/loading" /> </LinearLayout>1
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[/code]
三、代码分析
上拉加载更多数据通过监听RecyclerView的滚动事件RecyclerView.OnScrollListener()实现的,它提供了两个方法:/** * 当RecyclerView的滑动状态改变时触发 */ public void onScrollStateChanged(RecyclerView recyclerView, int newState){} /** * 当RecyclerView滑动时触发 * 类似点击事件的MotionEvent.ACTION_MOVE */ public void onScrolled(RecyclerView recyclerView, int dx, int dy){}1
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[/code]
RecyclerView的滑动状态有如下三种:
/** * The RecyclerView is not currently scrolling. * 手指离开屏幕 */ public static final int SCROLL_STATE_IDLE = 0; /** * The RecyclerView is currently being dragged by outside input such as user touch input. * 手指触摸屏幕 */ public static final int SCROLL_STATE_DRAGGING = 1; /** * The RecyclerView is currently animating to a final position while not under * outside control. * 手指加速滑动并放开,此时滑动状态伴随SCROLL_STATE_IDLE */ public static final int SCROLL_STATE_SETTLING = 2;1
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[/code]
由于简书APP的上拉加载更多的是在滑动到最后一个item时自动触发的,与手指是否在屏幕上无关,即与滑动状态无关。因此,实现这种效果只需要在public void onScrolled(RecyclerView recyclerView, int dx, int dy) 方法中操作,无需关注当时的滑动状态:
@Override public void onScrolled(RecyclerView recyclerView, int dx, int dy) { super.onScrolled(recyclerView, dx, dy); Log.d("test", "onScrolled"); int lastVisibleItemPosition = layoutManager.findLastVisibleItemPosition(); if (lastVisibleItemPosition + 1 == adapter.getItemCount()) { Log.d("test", "loading executed"); boolean isRefreshing = swipeRefreshLayout.isRefreshing(); if (isRefreshing) { adapter.notifyItemRemoved(adapter.getItemCount()); return; } if (!isLoading) { isLoading = true; handler.postDelayed(new Runnable() { @Override public void run() { getData(); Log.d("test", "load more completed"); isLoading = false; } }, 1000); } } }1
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[/code]
如果要实现当且仅当滑动到最后一项并且手指上拉抛出时才执行上拉加载更多效果的话,需要配合onScrollStateChanged(RecyclerView recyclerView, int newState的使用,可以将代码改为:
@Override public void onScrollStateChanged(RecyclerView recyclerView, int newState) { super.onScrollStateChanged(recyclerView, newState); Log.d("test", "StateChanged = " + newState); if (newState == RecyclerView.SCROLL_STATE_IDLE && lastVisibleItemPosition + 1 == adapter.getItemCount()) { Log.d("test", "loading executed"); boolean isRefreshing = swipeRefreshLayout.isRefreshing(); if (isRefreshing) { adapter.notifyItemRemoved(adapter.getItemCount()); return; } if (!isLoading) { isLoading = true; handler.postDelayed(new Runnable() { @Override public void run() { getData(); Log.d("test", "load more completed"); isLoading = false; } }, 1000); } } } @Override public void onScrolled(RecyclerView recyclerView, int dx, int dy) { super.onScrolled(recyclerView, dx, dy); Log.d("test", "onScrolled"); lastVisibleItemPosition = layoutManager.findLastVisibleItemPosition(); }1
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[/code]
加载更多的效果可以通过item_foot.xml自定义,滑动到最后一项时显示该item并执行加载更多,当加载数据完毕时需要将该item移除掉
adapter.notifyItemRemoved(adapter.getItemCount());1
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[/code]
下面的代码就是RecyclerView的多个item布局的实现方法:
@Override public int getItemCount() { return data.size() == 0 ? 0 : data.size() + 1; } @Override public int getItemViewType(int position) { if (position + 1 == getItemCount()) { return TYPE_FOOTER; } else { return TYPE_ITEM; } } @Override public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { if (viewType == TYPE_ITEM) { View view = LayoutInflater.from(context).inflate(R.layout.item_base, parent, false); return new ItemViewHolder(view); } else if (viewType == TYPE_FOOTER) { View view = LayoutInflater.from(context).inflate(R.layout.item_foot, parent, false); return new FootViewHolder(view); } return null; }1
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[/code]
该案例源码:https://github.com/leoleohan/RefreshDemo,欢迎Star、Fork。
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