在Android开发过程中经常需要实现上下拉刷新功能，Google推出的下拉刷新控件SwipeRefreshLayout（彩虹条），由于官方版本只有下拉刷新而没有上拉加载更多的功能，很多人也尝试在这个基础上进行改写。今天尝试一下使用SwipeRefreshLayout配合自定义ListView实现下拉刷新、滑到底部自动加载更多的功能。
效果图如下所示，在进入页面的时候加载自动刷新，滑到底部自动加载更多，当数据已经加载完成则显示已经加载完成，，否则上拉任可继续加载
先贴一下项目结构图吧，这样可能对于整个项目的了解会比较清晰一些
1.在效果图中我们可以看到在头部刷新时候的进度条ProgressBar的颜色本身是可以改变的，所以在color.xml中定义头部刷新时候的四种颜色，用于通过此颜色资源文件设置进度条动画的颜色
<?xml version="1.0" encoding="utf-8"?>
<resources>
<!-- 灰色 -->
<color name="grey">#FF999999</color>
<!--头部刷新时候的四种颜色-->
<color name="refresh_color_1">#ff00ddff</color>
<color name="refresh_color_2">#ff99cc00</color>
<color name="refresh_color_3">#ffffbb33</color>
<color name="refresh_color_4">#ffff4444</color>
</resources>
2.重写SwipeRefreshLayout下拉刷新控件
package com.xiaolijuan.swiperefreshlayoutdome.widget;
import android.content.Context;
import android.content.res.Resources;
import android.support.v4.widget.SwipeRefreshLayout;
import android.util.AttributeSet;
import android.view.MotionEvent;
import com.xiaolijuan.swiperefreshlayoutdome.R;
/**
* 项目名称：SwipeRefreshLayoutDome
* 类描述：配合LoadMoreListView 完成下拉刷新、滑到底部自动加载更多
* 创建人：xiaolijuan
* 创建时间：2015/12/12 9:00
*/
public class RefreshAndLoadMoreView extends SwipeRefreshLayout {
private LoadMoreListView mLoadMoreListView;
/**
* 构造方法，用于在布局文件中用到这个自定义SwipeRefreshLayout控件
* @param context
* @param attrs
*/
public RefreshAndLoadMoreView(Context context, AttributeSet attrs) {
super(context, attrs);
Resources res = getResources();
//通过颜色资源文件设置进度动画的颜色资源
setColorSchemeColors(res.getColor(R.color.refresh_color_1),
res.getColor(R.color.refresh_color_2),
res.getColor(R.color.refresh_color_3),
res.getColor(R.color.refresh_color_4));
}
public void setLoadMoreListView(LoadMoreListView mLoadMoreListView) {
this.mLoadMoreListView = mLoadMoreListView;
}
/**
* 触屏事件,如果ListView不为空且数据还在加载中，则继续加载直至完成加载才触摸此事件
* @param ev
* @return
*/
@Override
public boolean onTouchEvent(MotionEvent ev) {
if (mLoadMoreListView != null && mLoadMoreListView.isLoading()) {
return false;
}
return super.onTouchEvent(ev);
}
}
3.在update_loading_progressbar.xml定义进度条旋转的动画效果，用于设置绘制不显示进度的进度条的Drawable对象
<?xml version="1.0" encoding="utf-8"?>
<!--画面转移旋转动画效果：以组件的中点为中心顺时针从0度旋转到720度-->
<rotate xmlns:android="http://schemas.android.com/apk/res/android"
android:drawable="@mipmap/default_ptr_rotate_gray"
android:duration="700"
android:fromDegrees="0"
android:pivotX="50%"
android:pivotY="50%"
android:toDegrees="720" />
4.pull_to_load_footer.xml这是在ListView中载入的头部布局
<?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="wrap_content"
android:layout_gravity="center"
android:orientation="vertical">
<View style="@style/horizontalDivider" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="48dp"
android:gravity="center">
<ProgressBar
android:id="@+id/footer_progressbar"
android:layout_width="20dp"
android:layout_height="20dp"
android:layout_marginRight="8dp"
android:gravity="center"
android:indeterminateDrawable="@anim/update_loading_progressbar"
android:visibility="visible" />
<TextView
android:id="@+id/footer_hint_textview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="正在加载中"
android:textColor="#999999"
android:textSize="14dp" />
</LinearLayout>
</LinearLayout>
5.重写ListView，用于配合RefreshAndLoadMoreView 完成下拉刷新、滑到底部自动加载更多
package com.xiaolijuan.swiperefreshlayoutdome.widget;
import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.AbsListView;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;
import com.xiaolijuan.swiperefreshlayoutdome.R;
/**
* 项目名称：SwipeRefreshLayoutDome
* 类描述：配合RefreshAndLoadMoreView 完成下拉刷新、滑到底部自动加载更多
* 创建人：xiaolijuan
* 创建时间：2015/12/12 9:02
*/
public class LoadMoreListView extends ListView implements AbsListView.OnScrollListener {
private View rooterView;
private boolean isHaveMoreData = true;// 是否有更多数据(默认为有)
private ProgressBar progressBar;
private TextView tipContext;
private RefreshAndLoadMoreView mRefreshAndLoadMoreView;
private boolean isLoading = false;// 是否正在加载
private OnLoadMoreListener mOnLoadMoreListener;
public LoadMoreListView(Context context, AttributeSet attrs) {
super(context, attrs);
//动态载入底部布局
rooterView = LayoutInflater.from(context).inflate(
R.layout.pull_to_load_footer, null);
progressBar = (ProgressBar) rooterView.findViewById(R.id.footer_progressbar);
tipContext = (TextView) rooterView.findViewById(R.id.footer_hint_textview);
//向listView的底部添加布局(此时当给listView设置Item点击事件的时候，默认不触发这个添加的布局的点击事件)
addFooterView(rooterView, null, false);
setOnScrollListener(this);
}
public void setRefreshAndLoadMoreView(RefreshAndLoadMoreView mRefreshAndLoadMoreView) {
this.mRefreshAndLoadMoreView = mRefreshAndLoadMoreView;
}
/**
* 设置是否还有更多数据
*
* @param isHaveMoreData
*/
public void setHaveMoreData(boolean isHaveMoreData) {
this.isHaveMoreData = isHaveMoreData;
if (!isHaveMoreData) {
tipContext.setText("只有这么多啦");
progressBar.setVisibility(View.GONE);
} else {
tipContext.setText("正在加载");
progressBar.setVisibility(View.VISIBLE);
}
}
/**
* 加载完成
*/
public void onLoadComplete() {
isLoading = false;
}
public boolean isLoading() {
return isLoading;
}
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
if (scrollState == OnScrollListener.SCROLL_STATE_IDLE) {
if (view.getLastVisiblePosition() == view.getCount() - 1 && (mRefreshAndLoadMoreView != null &&
!mRefreshAndLoadMoreView.isRefreshing()) && !isLoading && mOnLoadMoreListener != null && isHaveMoreData) {
isLoading = true;
mOnLoadMoreListener.onLoadMore();
}
}
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
}
/**
* 加载更多的监听
*/
public static interface OnLoadMoreListener {
public void onLoadMore();
}
/**
* 设置加载监听
*
* @param mOnLoadMoreListener
*/
public void setOnLoadMoreListener(OnLoadMoreListener mOnLoadMoreListener) {
this.mOnLoadMoreListener = mOnLoadMoreListener;
}
}
6.MyAdapter
package com.xiaolijuan.swiperefreshlayoutdome.adapter;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import com.xiaolijuan.swiperefreshlayoutdome.R;
import java.util.List;
/**
* 项目名称：SwipeRefreshLayoutDome
* 类描述：适配器
* 创建人：xiaolijuan
* 创建时间：2015/12/12 22:09
*/
public class MyAdapter extends BaseAdapter {
private Context context;
private List<String> mTitleArray;// 标题数组
private int layoutId;
/**
* 构造方法
* @param context 上下文对象
* @param mTitleArray 标题数组
* @param layoutId 布局Id
*/
public MyAdapter(Context context, List<String> mTitleArray, int layoutId) {
this.context = context;
this.mTitleArray = mTitleArray;
this.layoutId = layoutId;
}
/**
* 获取Item总数
* @return
*/
@Override
public int getCount() {
return mTitleArray.size();
}
/**
* 获取一个Item对象
* @param position
* @return
*/
@Override
public Object getItem(int position) {
return mTitleArray.get(position);
}
/**
* 获取指定item的Id
* @param position
* @return
*/
@Override
public long getItemId(int position) {
return position;
}
/**
* 绘制的内容均在此实现
* @param position position就是位置从0开始
* @param convertView convertView是Spinner中每一项要显示的view
* @param parent parent就是父窗体了，也就是ListView
* @return
*/
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View item = convertView != null ? convertView : View.inflate(context, layoutId, null);
TextView txt_name = (TextView) item.findViewById(R.id.txt_title);
txt_name.setText(mTitleArray.get(position));
return item;
}
}
7.具体代码，代码写的很详细
package com.xiaolijuan.swiperefreshlayoutdome.activits;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.widget.SwipeRefreshLayout;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Toast;
import com.xiaolijuan.swiperefreshlayoutdome.R;
import com.xiaolijuan.swiperefreshlayoutdome.adapter.MyAdapter;
import com.xiaolijuan.swiperefreshlayoutdome.widget.LoadMoreListView;
import com.xiaolijuan.swiperefreshlayoutdome.widget.RefreshAndLoadMoreView;
import java.util.ArrayList;
import java.util.List;
/**
* 项目名称：SwipeRefreshLayoutDome
* 类描述：主界面
* 创建人：xiaolijuan
* 创建时间：2015/12/12 20:00
*/
public class MainActivity extends Activity {
private Context mContext;
private int pageIndex = 0;
private MyAdapter adapter;
private LoadMoreListView mLoadMoreListView;
private RefreshAndLoadMoreView mRefreshAndLoadMoreView;
private List<String> datas = new ArrayList<String>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mContext = this;
mLoadMoreListView = (LoadMoreListView) findViewById(R.id.load_more_list);
mRefreshAndLoadMoreView = (RefreshAndLoadMoreView) findViewById(R.id.refresh_and_load_more);
adapter = new MyAdapter(mContext, datas, R.layout.item_layout);
mLoadMoreListView.setAdapter(adapter);
initData();
}
private void initData() {
//程序开始就加载第一页数据
loadData(1);
mRefreshAndLoadMoreView.setLoadMoreListView(mLoadMoreListView);
mLoadMoreListView.setRefreshAndLoadMoreView(mRefreshAndLoadMoreView);
//设置下拉刷新监听
mRefreshAndLoadMoreView.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
loadData(1);
}
});
//设置加载监听
mLoadMoreListView.setOnLoadMoreListener(new LoadMoreListView.OnLoadMoreListener() {
@Override
public void onLoadMore() {
loadData(pageIndex + 1);
}
});
mLoadMoreListView.setOnItemClickListener(new ItemClickListener());
}
/**
* 加载数据
*/
private void loadData(final int tempPageIndex) {
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
if (tempPageIndex == 1) {
datas.clear();
}
getDatas(tempPageIndex);
//在这里我设置当加载到第三页时设置已经加载完成
if (tempPageIndex == 3) {
mLoadMoreListView.setHaveMoreData(false);
} else {
mLoadMoreListView.setHaveMoreData(true);
}
pageIndex = tempPageIndex;
adapter.notifyDataSetChanged();
//当加载完成之后设置此时不在刷新状态
mRefreshAndLoadMoreView.setRefreshing(false);
mLoadMoreListView.onLoadComplete();
}
}, 1000);
}
/**
* 模拟一些数据源
*
* @return
*/
private List<String> getDatas(final int tempPageIndex) {
switch (tempPageIndex) {
case 1:
for (int i = 0; i < 10; i++) {
datas.add("这是第" + (i + 1) + "个Item");
}
break;
case 2:
for (int i = 0; i < 10; i++) {
datas.add("这是第" + (i + 11) + "个Item");
}
break;
case 3:
for (int i = 0; i < 10; i++) {
datas.add("这是第" + (i + 21) + "个Item");
}
break;
default:
break;
}
return datas;
}
/**
* 为ListView每个Item添加点击事件
*/
public class ItemClickListener implements AdapterView.OnItemClickListener {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Toast.makeText(getApplicationContext(), datas.get(position), Toast.LENGTH_LONG).show();
}
}
}
8.结束啦，由于代码里边都有注释哒，我就不做解释咯，有不足的还望指导
Dome下载：探索SwipeRefreshLayout配合自定义ListView完成下拉刷新、滑到底部自动加载更多
