Android带刷新时间显示的PullToRefresh上下拉刷新

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package jiexinkeji.com.shuaxin;

public interface OnRefreshListener {

 /**
 * 下拉刷新
 */
 void onDownPullRefresh();

 /**
 * 上拉加载更多
 */
 void onLoadingMore();
}

package jiexinkeji.com.shuaxin;

import android.content.Context;
import android.support.v4.widget.SwipeRefreshLayout;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.RotateAnimation;
import android.widget.AbsListView;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;

import java.text.SimpleDateFormat;

public class RefreshListView extends ListView implements AbsListView.OnScrollListener {

 private static final String TAG = "RefreshListView";
 private int firstVisibleItemPosition; // 屏幕显示在第一个的item的索引
 private int downY; // 按下时y轴的偏移量
 private int headerViewHeight; // 头布局的高度
 private View headerView; // 头布局的对象

 private final int DOWN_PULL_REFRESH = 0; // 下拉刷新状态
 private final int RELEASE_REFRESH = 1; // 松开刷新
 private final int REFRESHING = 2; // 正在刷新中
 private int currentState = DOWN_PULL_REFRESH; // 头布局的状态: 默认为下拉刷新状态

 private Animation upAnimation; // 向上旋转的动画
 private Animation downAnimation; // 向下旋转的动画

 private ImageView ivArrow; // 头布局的剪头
 private ProgressBar mProgressBar; // 头布局的进度条
 private TextView tvState; // 头布局的状态
 private TextView tvLastUpdateTime; // 头布局的最后更新时间

 private OnRefreshListener mOnRefershListener;
 private boolean isScrollToBottom; // 是否滑动到底部
 private View footerView; // 脚布局的对象
 private int footerViewHeight; // 脚布局的高度
 private boolean isLoadingMore = false; // 是否正在加载更多中

 public RefreshListView(Context context, AttributeSet attrs) {
 super(context, attrs);
 initHeaderView();
 initFooterView();
 this.setOnScrollListener(this);
 }

 /**
 * 初始化脚布局
 */
 private void initFooterView() {
 footerView = View.inflate(getContext(), R.layout.listview_footer, null);
 footerView.measure(0, 0);
 footerViewHeight = footerView.getMeasuredHeight();
 footerView.setPadding(0, -footerViewHeight, 0, 0);
 this.addFooterView(footerView);
 }

 /**
 * 初始化头布局
 */
 private void initHeaderView() {
 headerView = View.inflate(getContext(), R.layout.listview_header, null);
 ivArrow = (ImageView) headerView
  .findViewById(R.id.iv_listview_header_arrow);
 mProgressBar = (ProgressBar) headerView
  .findViewById(R.id.pb_listview_header);
 tvState = (TextView) headerView
  .findViewById(R.id.tv_listview_header_state);
 tvLastUpdateTime = (TextView) headerView
  .findViewById(R.id.tv_listview_header_last_update_time);

 // 设置最后刷新时间
 tvLastUpdateTime.setText("最后刷新时间: " + getLastUpdateTime());

 headerView.measure(0, 0); // 系统会帮我们测量出headerView的高度
 headerViewHeight = headerView.getMeasuredHeight();
 headerView.setPadding(0, -headerViewHeight, 0, 0);
 this.addHeaderView(headerView); // 向ListView的顶部添加一个view对象
 initAnimation();
 }

 /**
 * 获得系统的最新时间
 *
 * @return
 */
 private String getLastUpdateTime() {
 SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
 return sdf.format(System.currentTimeMillis());
 }

 /**
 * 初始化动画
 */
 private void initAnimation() {
 upAnimation = new RotateAnimation(0f, -180f,
  Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,
  0.5f);
 upAnimation.setDuration(500);
 upAnimation.setFillAfter(true); // 动画结束后, 停留在结束的位置上

 downAnimation = new RotateAnimation(-180f, -360f,
  Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,
  0.5f);
 downAnimation.setDuration(500);
 downAnimation.setFillAfter(true); // 动画结束后, 停留在结束的位置上
 }

 @Override
 public boolean onTouchEvent(MotionEvent ev) {
 switch (ev.getAction()) {
  case MotionEvent.ACTION_DOWN :
  downY = (int) ev.getY();
  break;
  case MotionEvent.ACTION_MOVE :
  int moveY = (int) ev.getY();
  // 移动中的y - 按下的y = 间距.
  int diff = (moveY - downY) / 2;
  // -头布局的高度 + 间距 = paddingTop
  int paddingTop = -headerViewHeight + diff;
  // 如果: -头布局的高度 > paddingTop的值 执行super.onTouchEvent(ev);
  if (firstVisibleItemPosition == 0
   && -headerViewHeight < paddingTop) {
   if (paddingTop > 0 && currentState == DOWN_PULL_REFRESH) { // 完全显示了.
   Log.i(TAG, "松开刷新");
   currentState = RELEASE_REFRESH;
   refreshHeaderView();
   } else if (paddingTop < 0
    && currentState == RELEASE_REFRESH) { // 没有显示完全
   Log.i(TAG, "下拉刷新");
   currentState = DOWN_PULL_REFRESH;
   refreshHeaderView();
   }
   // 下拉头布局
   headerView.setPadding(0, paddingTop, 0, 0);
   return true;
  }
  break;
  case MotionEvent.ACTION_UP :
  // 判断当前的状态是松开刷新还是下拉刷新
  if (currentState == RELEASE_REFRESH) {
   Log.i(TAG, "刷新数据.");
   // 把头布局设置为完全显示状态
   headerView.setPadding(0, 0, 0, 0);
   // 进入到正在刷新中状态
   currentState = REFRESHING;
   refreshHeaderView();

   if (mOnRefershListener != null) {
   mOnRefershListener.onDownPullRefresh(); // 调用使用者的监听方法
   }
  } else if (currentState == DOWN_PULL_REFRESH) {
   // 隐藏头布局
   headerView.setPadding(0, -headerViewHeight, 0, 0);
  }
  break;
  default :
  break;
 }
 return super.onTouchEvent(ev);
 }

 /**
 * 根据currentState刷新头布局的状态
 */
 private void refreshHeaderView() {
 switch (currentState) {
  case DOWN_PULL_REFRESH : // 下拉刷新状态
  tvState.setText("下拉刷新");
  ivArrow.startAnimation(downAnimation); // 执行向下旋转
  break;
  case RELEASE_REFRESH : // 松开刷新状态
  tvState.setText("松开刷新");
  ivArrow.startAnimation(upAnimation); // 执行向上旋转
  break;
  case REFRESHING : // 正在刷新中状态
  ivArrow.clearAnimation();
  ivArrow.setVisibility(View.GONE);
  mProgressBar.setVisibility(View.VISIBLE);
  tvState.setText("正在刷新中...");
  break;
  default :
  break;
 }
 }

 /**
 * 当滚动状态改变时回调
 */
 @Override
 public void onScrollStateChanged(AbsListView view, int scrollState) {

 if (scrollState == SCROLL_STATE_IDLE
  || scrollState == SCROLL_STATE_FLING) {
  // 判断当前是否已经到了底部
  if (isScrollToBottom && !isLoadingMore) {
  isLoadingMore = true;
  // 当前到底部
  Log.i(TAG, "加载更多数据");
  footerView.setPadding(0, 0, 0, 0);
  this.setSelection(this.getCount());

  if (mOnRefershListener != null) {
   mOnRefershListener.onLoadingMore();
  }
  }
 }
 }

 /**
 * 当滚动时调用
 *
 * @param firstVisibleItem
 *  当前屏幕显示在顶部的item的position
 * @param visibleItemCount
 *  当前屏幕显示了多少个条目的总数
 * @param totalItemCount
 *  ListView的总条目的总数
 */
 @Override
 public void onScroll(AbsListView view, int firstVisibleItem,
    int visibleItemCount, int totalItemCount) {
 firstVisibleItemPosition = firstVisibleItem;

 if (getLastVisiblePosition() == (totalItemCount - 1)) {
  isScrollToBottom = true;
 } else {
  isScrollToBottom = false;
 }
 }

 /**
 * 设置刷新监听事件
 *
 * @param listener
 */
 public void setOnRefreshListener(OnRefreshListener listener) {
 mOnRefershListener = listener;
 }

 /**
 * 隐藏头布局
 */
 public void hideHeaderView() {
 headerView.setPadding(0, -headerViewHeight, 0, 0);
 ivArrow.setVisibility(View.VISIBLE);
 mProgressBar.setVisibility(View.GONE);
 tvState.setText("下拉刷新");
 tvLastUpdateTime.setText("最后刷新时间: " + getLastUpdateTime());
 currentState = DOWN_PULL_REFRESH;
 }

 /**
 * 隐藏脚布局
 */
 public void hideFooterView() {
 footerView.setPadding(0, -footerViewHeight, 0, 0);
 isLoadingMore = false;
 }
}

package jiexinkeji.com.shuaxin;

import android.app.Activity;
import android.graphics.Color;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.SystemClock;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends Activity implements OnRefreshListener {

 private List textList;
 private MyAdapter adapter;
 private RefreshListView rListView;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);

 rListView = (RefreshListView) findViewById(R.id.refreshlistview);
 textList = new ArrayList();
 for (int i = 0; i < 25; i++) {
  textList.add("这是一条ListView的数据" + i);
 }
 adapter = new MyAdapter();
 rListView.setAdapter(adapter);
 rListView.setOnRefreshListener(this);
 }

 private class MyAdapter extends BaseAdapter {

 @Override
 public int getCount() {
  // TODO Auto-generated method stub
  return textList.size();
 }

 @Override
 public Object getItem(int position) {
  // TODO Auto-generated method stub
  return textList.get(position);
 }

 @Override
 public long getItemId(int position) {
  // TODO Auto-generated method stub
  return position;
 }

 @Override
 public View getView(int position, View convertView, ViewGroup parent) {
  // TODO Auto-generated method stub
  TextView textView = new TextView(MainActivity.this);
  textView.setText(textList.get(position));
  textView.setTextSize(18.0f);
  return textView;
 }

 }

 @Override
 public void onDownPullRefresh() {
 new AsyncTask() {

  @Override
  protected Void doInBackground(Void... params) {
  SystemClock.sleep(2000);
  for (int i = 0; i < 2; i++) {
   textList.add(0, "这是下拉刷新出来的数据" + i);
  }
  return null;
  }

  @Override
  protected void onPostExecute(Void result) {
  adapter.notifyDataSetChanged();
  rListView.hideHeaderView();
  }
 }.execute(new Void[]{});
 }

 @Override
 public void onLoadingMore() {
 new AsyncTask() {

  @Override
  protected Void doInBackground(Void... params) {
  SystemClock.sleep(5000);

  textList.add("这是加载更多出来的数据1");
  textList.add("这是加载更多出来的数据2");
  textList.add("这是加载更多出来的数据3");
  return null;
  }

  @Override
  protected void onPostExecute(Void result) {
  adapter.notifyDataSetChanged();

  // 控制脚布局隐藏
  rListView.hideFooterView();
  }
 }.execute(new Void[]{});
 }

}