1、 设置mHeaderView.setPadding TOPPADING为负值，隐藏刷新提示头布局
在onTouchEvent事件中进行头布局显示隐藏切换
import java.text.SimpleDateFormat; import java.util.Date; import android.content.Context; import android.util.AttributeSet; import android.view.MotionEvent; import android.view.View; import android.view.animation.Animation; import android.view.animation.RotateAnimation; import android.widget.ImageView; import android.widget.ListView; import android.widget.ProgressBar; import android.widget.TextView; import com.itheima.zhsh66.R; /** * 下拉刷新的listview * */ public class RefreshListView extends ListView { private static final int STATE_PULL_TO_REFRESH = 1;// 下拉刷新 private static final int STATE_RELEASE_TO_REFRESH = 2;// 松开刷新 private static final int STATE_REFRESHING = 3;// 正在刷新 // 下拉刷新头布局 private View mHeaderView; // 头布局高度 private int mHeaderViewHeight; private int startY = -1; // 当前下拉刷新的状态 private int mCurrentState = STATE_PULL_TO_REFRESH;// 默认是下拉刷新 private TextView tvTitle; private ImageView ivArrow; private ProgressBar pbLoading; private TextView tvTime; private RotateAnimation animUp;// 箭头向上动画 private RotateAnimation animDown;// 箭头向下动画 public RefreshListView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); initView(); } public RefreshListView(Context context, AttributeSet attrs) { super(context, attrs); initView(); } public RefreshListView(Context context) { super(context); initView(); } private void initView() { mHeaderView = View.inflate(getContext(), R.layout.list_refresh_header, null); this.addHeaderView(mHeaderView);// 添加头布局 // 隐藏头布局(1, 获取头布局高度, 2.设置负paddingTop,布局就会往上走) // int height = mHeaderView.getHeight();//此处无法获取高度,因为布局还没有绘制完成 // 绘制之前就要获取布局高度 mHeaderView.measure(0, 0);// 手动测量布局 mHeaderViewHeight = mHeaderView.getMeasuredHeight();// 测量之后的高度 // 隐藏头布局 mHeaderView.setPadding(0, -mHeaderViewHeight, 0, 0); tvTitle = (TextView) mHeaderView.findViewById(R.id.tv_title); ivArrow = (ImageView) mHeaderView.findViewById(R.id.iv_arrow); pbLoading = (ProgressBar) mHeaderView.findViewById(R.id.pb_loading); tvTime = (TextView) mHeaderView.findViewById(R.id.tv_time); initAnim(); setCurrentTime();// 设置初始时间 } @Override public boolean onTouchEvent(MotionEvent ev) { switch (ev.getAction()) { case MotionEvent.ACTION_DOWN: startY = (int) ev.getY(); break; case MotionEvent.ACTION_MOVE: if (startY == -1) {// 如果用户按住头条新闻向下滑动, 会导致listview无法拿到ACTION_DOWN, //因为此时事件会被交给父控件处理 // 此时要重新获取startY startY = (int) ev.getY(); } // 如果当前正在刷新, 什么都不做了 if (mCurrentState == STATE_REFRESHING) { break; } int endY = (int) ev.getY(); int dy = endY - startY; if (dy > 0 && getFirstVisiblePosition() == 0) {// 向下滑动&当前显示的是第一个item,才允许下拉刷新 int paddingTop = dy - mHeaderViewHeight;// 计算当前的paddingtop值 // 根据padding切换状态 if (paddingTop >= 0 && mCurrentState != STATE_RELEASE_TO_REFRESH) { // 切换到松开刷新 mCurrentState = STATE_RELEASE_TO_REFRESH; refreshState(); } else if (paddingTop < 0 && mCurrentState != STATE_PULL_TO_REFRESH) { // 切换到下拉刷新 mCurrentState = STATE_PULL_TO_REFRESH; refreshState(); } mHeaderView.setPadding(0, paddingTop, 0, 0);// 重新设置头布局padding return true; } break; case MotionEvent.ACTION_UP: startY = -1;// 起始坐标归零 if (mCurrentState == STATE_RELEASE_TO_REFRESH) { // 如果当前是松开刷新, 就要切换为正在刷新 mCurrentState = STATE_REFRESHING; // 显示头布局 mHeaderView.setPadding(0, 0, 0, 0); refreshState(); // 下拉刷新回调 if (mListener != null) { mListener.onRefresh(); } } else if (mCurrentState == STATE_PULL_TO_REFRESH) { // 隐藏头布局 mHeaderView.setPadding(0, -mHeaderViewHeight, 0, 0); } break; default: break; } return super.onTouchEvent(ev); } /** * 初始化箭头动画 */ private void initAnim() { animUp = new RotateAnimation(0, -180, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); animUp.setDuration(500); animUp.setFillAfter(true);// 保持状态 animDown = new RotateAnimation(-180, 0, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); animDown.setDuration(500); animDown.setFillAfter(true);// 保持状态 } /** * 根据当前状态刷新界面 */ private void refreshState() { switch (mCurrentState) { case STATE_PULL_TO_REFRESH: tvTitle.setText("下拉刷新"); // 箭头向下移动 ivArrow.startAnimation(animDown); // 隐藏进度条 pbLoading.setVisibility(View.INVISIBLE); ivArrow.setVisibility(View.VISIBLE); break; case STATE_RELEASE_TO_REFRESH: tvTitle.setText("松开刷新"); // 箭头向上移动 ivArrow.startAnimation(animUp); // 隐藏进度条 pbLoading.setVisibility(View.INVISIBLE); ivArrow.setVisibility(View.VISIBLE); break; case STATE_REFRESHING: tvTitle.setText("正在刷新..."); pbLoading.setVisibility(View.VISIBLE); ivArrow.clearAnimation();// 必须清除动画,才能隐藏控件 ivArrow.setVisibility(View.INVISIBLE); break; default: break; } } private OnRefreshListener mListener; public void setOnRefreshListener(OnRefreshListener listener) { mListener = listener; } /** * 设置上次刷新时间 */ private void setCurrentTime() { // 08:10 8:10 1 SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");// HH表示24小时制 String time = format.format(new Date()); tvTime.setText(time); } // 刷新完成 public void onRefreshComplete(boolean success) { // 隐藏头布局 mHeaderView.setPadding(0, -mHeaderViewHeight, 0, 0); mCurrentState = STATE_PULL_TO_REFRESH; // 隐藏进度条 pbLoading.setVisibility(View.INVISIBLE); ivArrow.setVisibility(View.VISIBLE); tvTitle.setText("下拉刷新"); // 刷新失败,不需要更新时间 if (success) { setCurrentTime(); } } public interface OnRefreshListener { // 下拉刷新的回调 public void onRefresh(); } }