我的学习步骤；

在网上下载demo；然后把必要的导入到项目中；

在此附上下载源码：

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具体下载目录在 /2015年资料/6月/12日/Android下拉刷新上拉加载简单的实现方法/

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所有的源代码如下；

XListViewFooter类

/**
?* @file XFooterView.java
?* @create Mar 31, 2012 9:33:43 PM
?* @author Maxwin
?* @description XListView's footer
?*/
package me.maxwin.view;

import me.maxwin.R;
import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TextView;

public class XListViewFooter extends LinearLayout {
?public final static int STATE_NORMAL = 0;
?public final static int STATE_READY = 1;
?public final static int STATE_LOADING = 2;

?private Context mContext;

?private View mContentView;
?private View mProgressBar;
?private TextView mHintView;
?
?public XListViewFooter(Context context) {
? super(context);
? initView(context);
?}
?
?public XListViewFooter(Context context, AttributeSet attrs) {
? super(context, attrs);
? initView(context);
?}

?
?public void setState(int state) {
? mHintView.setVisibility(View.INVISIBLE);
? mProgressBar.setVisibility(View.INVISIBLE);
? mHintView.setVisibility(View.INVISIBLE);
? if (state == STATE_READY) {
? ?mHintView.setVisibility(View.VISIBLE);
? ?mHintView.setText(R.string.xlistview_footer_hint_ready);
? } else if (state == STATE_LOADING) {
? ?mProgressBar.setVisibility(View.VISIBLE);
? } else {
? ?mHintView.setVisibility(View.VISIBLE);
? ?mHintView.setText(R.string.xlistview_footer_hint_normal);
? }
?}
?
?public void setBottomMargin(int height) {
? if (height < 0) return ;
? LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams)mContentView.getLayoutParams();
? lp.bottomMargin = height;
? mContentView.setLayoutParams(lp);
?}
?
?public int getBottomMargin() {
? LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams)mContentView.getLayoutParams();
? return lp.bottomMargin;
?}
?
?
?/**
? * normal status
? */
?public void normal() {
? mHintView.setVisibility(View.VISIBLE);
? mProgressBar.setVisibility(View.GONE);
?}
?
?
?/**
? * loading status
? */
?public void loading() {
? mHintView.setVisibility(View.GONE);
? mProgressBar.setVisibility(View.VISIBLE);
?}
?
?/**
? * hide footer when disable pull load more
? */
?public void hide() {
? LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams)mContentView.getLayoutParams();
? lp.height = 0;
? mContentView.setLayoutParams(lp);
?}
?
?/**
? * show footer
? */
?public void show() {
? LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams)mContentView.getLayoutParams();
? lp.height = LayoutParams.WRAP_CONTENT;
? mContentView.setLayoutParams(lp);
?}
?
?private void initView(Context context) {
? mContext = context;
? LinearLayout moreView = (LinearLayout)LayoutInflater.from(mContext).inflate(R.layout.xlistview_footer, null);
? addView(moreView);
? moreView.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
?
? mContentView = moreView.findViewById(R.id.xlistview_footer_content);
? mProgressBar = moreView.findViewById(R.id.xlistview_footer_progressbar);
? mHintView = (TextView)moreView.findViewById(R.id.xlistview_footer_hint_textview);
?}
?
?
}