MaterialRefreshLayout实现下拉刷新上拉加载更多
来源:互联网 发布:网络犯罪特搜班土豆 编辑:程序博客网 时间:2024/05/22 17:05
通过本文可以了解以下几方面:
- 1、MaterialRefreshLayout是什么
- 2、MaterialRefreshLayout怎么使用
- 3、一个简单的小小demo带你实现下拉刷新上拉加载更多
首先看下效果图:
MaterialRefreshLayout是什么
项目地址: https://github.com/android-cjj/Android-MaterialRefreshLayout
简介:这是一个下拉刷新控件,它比SwipeRefreshLayout更漂亮和强大,使用也比较简单。支持android 3.0 以上。希望你喜欢,呵呵。
用法介绍(摘自官方文档)
AS添加依赖库,这样就不用导入整个library库,Eclipse的用户导入library库,慢慢折腾吧!(因为我觉得如果不是环境不允许你用as的话,还是放弃eclipse吧,毕竟github上很多优秀的项目都是用as的,好吧我多嘴了…)
dependencies { compile 'com.cjj.materialrefeshlayout:library:1.3.0'}
在你的layout xml.添加下面的代码:
<com.cjj.MaterialRefreshLayout android:id="@+id/refresh" android:layout_width="match_parent" android:layout_height="match_parent" > <!--在这里我们可以添加ListView OR GridView OR RecycleView OR ScrollView OR 更多--> <...ListView or GridView or RecyclerView or ScrollView and more...></com.cjj.MaterialRefreshLayout>
在java中实现以下代码:
materialRefreshLayout = (MaterialRefreshLayout) findViewById(R.id...);materialRefreshLayout.setMaterialRefreshListener(new MaterialRefreshListener() { @Override public void onRefresh(final MaterialRefreshLayout materialRefreshLayout) { //下拉刷新... } @Override public void onRefreshLoadMore(MaterialRefreshLayout materialRefreshLayout) { //上拉加载更多... } }// 结束下拉刷新...materialRefreshLayout.finishRefresh();// 结束上拉刷新... materialRefreshLayout.finishRefreshLoadMore();
下拉效果配置(官方提供了6中下拉效果,这里提供本例子中使用的,如果想要了解更多,请去官方查看)
<com.cjj.MaterialRefreshLayout android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/refresh" app:overlay="false" app:wave_show="true" app:wave_color="@color/material_green" app:wave_height_type="higher" >
好了,不多说,看代码吧。(一切还是以代码为主啊,只有代码实现了功能,才是王道)
MainActivity.java:
package com.example.materialrefreshlayoutdemo;import android.os.Bundle;import android.os.Handler;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.widget.Toast;import com.cjj.MaterialRefreshLayout;import com.cjj.MaterialRefreshListener;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity { private MaterialRefreshLayout mRefreshLayout; private RecyclerView mRecyclerView; /** * 刚初始化的数据 */ private List<String> datas = new ArrayList<>(); /** * 一个承接数据的数组 */ private List<String> mList = new ArrayList<>(); private MyAdapter mAdapter; /** * 在上拉刷新的时候,判断,是否处于上拉刷新,如果是的话,就禁止在一次刷新,保障在数据加载完成之前 * 避免重复和多次加载 */ private boolean isLoadMore = true; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); initDatas(); } /** * 初始化布局控件 */ private void initView() { mRefreshLayout = (MaterialRefreshLayout) findViewById(R.id.refresh); mRecyclerView = (RecyclerView) findViewById(R.id.recycleview); initRefresh(); } /** * 初始化加载 */ private void initRefresh() { mAdapter = new MyAdapter(datas); mRecyclerView.setAdapter(mAdapter); //下面可以自己设置默认动画 mRecyclerView.setItemAnimator(new DefaultItemAnimator()); //下面可以自己设置排版方式 mRecyclerView.setLayoutManager(new LinearLayoutManager(this)); /** * 设置是否上拉加载更多,默认是false,要手动改为true,要不然不会出现上拉加载 */ mRefreshLayout.setLoadMore(isLoadMore); //设置分割线 mRecyclerView.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.VERTICAL_LIST)); mRefreshLayout.setMaterialRefreshListener(new MaterialRefreshListener() { /** * 刷新的方法,我这里演示的是下拉刷新,因为没有数据,我这里也就只是toast一下 * 如果想要实现你们自己要的结果,就会在定义一个方法,获取最新数据,或者是在次 * 在这里调用之前获取数据的方法,以达到刷新数据的功能 * @param materialRefreshLayout */ @Override public void onRefresh(MaterialRefreshLayout materialRefreshLayout) { //一般加载数据都是在子线程中,这里我用到了handler new Handler().postDelayed(new Runnable() { @Override public void run() { Toast.makeText(MainActivity.this, "已经没有更多数据了", Toast.LENGTH_SHORT).show(); /** * 刷新完成后调用此方法,要不然刷新效果不消失 */ mRefreshLayout.finishRefresh(); } }, 3000); } /** * 上拉加载更多的方法,在这里我只是简单的模拟了加载四条数据 * 真正用的时候,就会去定义方法,获取数据,一般都是分页,在数据端获取的时候 * 把页数去增加一,然后在去服务端去获取数据 * @param materialRefreshLayout */ @Override public void onRefreshLoadMore(MaterialRefreshLayout materialRefreshLayout) { new Handler().postDelayed(new Runnable() { @Override public void run() { isLoadMore = false; for (int i = 0; i <= 3; i++) { mList.add(i, "new City " + i); } //通知刷新 mAdapter.addLists(mAdapter.getLists().size(), mList); //mRecyclerView.scrollToPosition(mAdapter.getLists().size()); /** * 完成加载数据后,调用此方法,要不然刷新的效果不会消失 */ mRefreshLayout.finishRefreshLoadMore(); } }, 3000); } }); } /** * 初始化数据 */ private void initDatas() { datas.add("New York"); datas.add("Bei Jing"); datas.add("Boston"); datas.add("London"); datas.add("San Francisco"); datas.add("Chicago"); datas.add("Shang Hai"); datas.add("Tian Jin"); datas.add("Zheng Zhou"); datas.add("Hang Zhou"); datas.add("Guang Zhou"); datas.add("Fu Gou"); datas.add("Zhou Kou"); }}
MyAdapter.java:
package com.example.materialrefreshlayoutdemo;import android.support.v7.widget.RecyclerView;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;import java.util.List;/** * Created by 若兰 on 2016/1/26. * 一个懂得了编程乐趣的小白,希望自己 * 能够在这个道路上走的很远,也希望自己学习到的 * 知识可以帮助更多的人,分享就是学习的一种乐趣 * QQ:1069584784 * csdn:http://blog.csdn.net/wuyinlei */public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> { /** * 加载布局的 */ private LayoutInflater mInflater; /** * 用来存放数据的集合 */ private List<String> mLists; /** * 自定义的item点击(在这里没有用到) */ private OnItemClickListener mListener; /** * mListener get方法 * @return */ public OnItemClickListener getListener() { return mListener; } /** * mListener set方法 * @param listener */ public void setListener(OnItemClickListener listener) { mListener = listener; } /** * mLists集合的get方法 通过他可以取得数据的size(); * @return */ public List<String> getLists() { return mLists; } /** * 对以下方法的复用 * @param lists */ public void addLists(List<String> lists) { addLists(0, lists); } /** * 添加数据 * @param position 添加的位置 * @param lists 添加的数据 */ public void addLists(int position, List<String> lists) { //mLists = lists; if (lists != null && lists.size() > 0) { mLists.addAll(lists); /** * Notify any registered observers that the <code>itemCount</code> items starting at * position <code>positionStart</code> have changed. * * 通知item是从哪个地方到哪个地方已经改变了 */ notifyItemRangeChanged(position, mLists.size()); } } /** * 构造方法,通过new对象的时候传入数据 * @param items */ public MyAdapter(List<String> items) { mLists = items; } // 创建ViewHolder ,相当于ListVie Adapter 的getView 方法 @Override public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { mInflater = LayoutInflater.from(parent.getContext()); View view = mInflater.inflate(R.layout.list_item, null); return new MyViewHolder(view); } /** * 绑定数据 * @param holder * @param position */ @Override public void onBindViewHolder(MyViewHolder holder, int position) { holder.tv_text.setText(mLists.get(position)); } @Override public int getItemCount() { return mLists.size(); } class MyViewHolder extends RecyclerView.ViewHolder { private TextView tv_text; public MyViewHolder(View itemView) { super(itemView); tv_text = (TextView) itemView.findViewById(R.id.tv_item); /** * 如果我们想要实现item的点击事件,就要在这处理,因为recycleview * 并没有给我们提供直接的点击触摸事件,这个也是他的好处(也可以理解为不好的地方) */ tv_text.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (mListener != null) { mListener.onClick(v, getLayoutPosition(), mLists.get(getLayoutPosition())); } } }); } } //RecycleView的事件监听,这个要自己去写,里面的参数也是根据自己的需要去定义 //不像listview中,已经有了item的点击监听事件 interface OnItemClickListener { //自己定义 void onClick(View v, int position, String item); }}
activity_main.xml:
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" xmlns:app="http://schemas.android.com/apk/res-auto" android:orientation="vertical"> <com.cjj.MaterialRefreshLayout android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/refresh" app:overlay="false" app:wave_show="true" app:wave_color="@color/material_green" app:wave_height_type="higher" > <android.support.v7.widget.RecyclerView android:layout_width="match_parent" android:id="@+id/recycleview" android:layout_height="match_parent"> </android.support.v7.widget.RecyclerView> </com.cjj.MaterialRefreshLayout></LinearLayout>
item_list.xml:
<?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="match_parent" android:orientation="vertical" > <TextView android:id="@+id/tv_item" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_gravity="center" android:padding="10dp" android:text="1" android:gravity="center" android:textColor="#000" android:textSize="20dp"/></RelativeLayout>
DividerItemDecoration.java(这个网上找的):
package com.example.materialrefreshlayoutdemo;/** * Created by ruolan on 2015/11/11. *//* * Copyright (C) 2014 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */import android.content.Context;import android.content.res.TypedArray;import android.graphics.Canvas;import android.graphics.Rect;import android.graphics.drawable.Drawable;import android.support.v7.widget.LinearLayoutManager;import android.support.v7.widget.RecyclerView;import android.view.View;/** * This class is from the v7 samples of the Android SDK. It's not by me! * <p/> * See the license above for details. */public class DividerItemDecoration extends RecyclerView.ItemDecoration{ private static final int[] ATTRS = new int[] { android.R.attr.listDivider }; public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL; public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL; private Drawable mDivider; private int mOrientation; public DividerItemDecoration(Context context, int orientation) { final TypedArray a = context.obtainStyledAttributes(ATTRS); mDivider = a.getDrawable(0); a.recycle(); setOrientation(orientation); } public void setOrientation(int orientation) { if (orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST) { throw new IllegalArgumentException("invalid orientation"); } mOrientation = orientation; } @Override public void onDraw(Canvas c, RecyclerView parent) { if (mOrientation == VERTICAL_LIST) { drawVertical(c, parent); } else { drawHorizontal(c, parent); } } public void drawVertical(Canvas c, RecyclerView parent) { final int left = parent.getPaddingLeft(); final int right = parent.getWidth() - parent.getPaddingRight(); final int childCount = parent.getChildCount(); for (int i = 0; i < childCount; i++) { final View child = parent.getChildAt(i); RecyclerView v = new RecyclerView( parent.getContext()); final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child .getLayoutParams(); final int top = child.getBottom() + params.bottomMargin; final int bottom = top + mDivider.getIntrinsicHeight(); mDivider.setBounds(left, top, right, bottom); mDivider.draw(c); } } public void drawHorizontal(Canvas c, RecyclerView parent) { final int top = parent.getPaddingTop(); final int bottom = parent.getHeight() - parent.getPaddingBottom(); final int childCount = parent.getChildCount(); for (int i = 0; i < childCount; i++) { final View child = parent.getChildAt(i); final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child .getLayoutParams(); final int left = child.getRight() + params.rightMargin; final int right = left + mDivider.getIntrinsicHeight(); mDivider.setBounds(left, top, right, bottom); mDivider.draw(c); } } @Override public void getItemOffsets(Rect outRect, int itemPosition, RecyclerView parent) { if (mOrientation == VERTICAL_LIST) { outRect.set(0, 0, 0, mDivider.getIntrinsicHeight()); } else { outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0); } }}
好了,一个简单的上拉加载更多和下拉刷新就完成了,如果有兴趣,可以参考一下这个文章
RecycleView+SwipeRefreshLayout 实现下拉刷新地址:
- http://blog.csdn.net/wuyinlei/article/details/49805567
MaterialRefreshLayout实现下拉刷新上拉加载更多项目的github地址:
- https://github.com/wuyinlei/MaterialRefreshLayoutDemo
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