基本信息
源码名称：Android ListView 下拉刷新 上拉更多
源码大小：0.20M
文件格式：.zip
开发语言：Java
更新时间：2013-08-07
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源码介绍
Android ListView 下拉刷新 上拉更多
Android ListView 下拉刷新 上拉更多
public class ScrollOverListView extends ListView implements OnScrollListener {
private int mLastY;
private int mBottomPosition;
private static final String TAG = "listview";
/**松开更新**/
private final static int RELEASE_To_REFRESH = 0;
/**下拉更新**/
private final static int PULL_To_REFRESH = 1;
/**更新中**/
private final static int REFRESHING = 2;
/**无**/
private final static int DONE = 3;
/**加载中**/
private final static int LOADING = 4;
/**实际的padding的距离与界面上偏移距离的比例**/
private final static int RATIO = 3;
private LayoutInflater inflater;
/**头部刷新的布局**/
private LinearLayout headView;
/**头部显示下拉刷新等的控件**/
private TextView tipsTextview;
/**刷新控件**/
private TextView lastUpdatedTextView;
/**箭头图标**/
private ImageView arrowImageView;
/**头部滚动条**/
private ProgressBar progressBar;
/**显示动画**/
private RotateAnimation animation;
/**头部回退显示动画**/
private RotateAnimation reverseAnimation;
/** 用于保证startY的值在一个完整的touch事件中只被记录一次**/
private boolean isRecored;
/**头部高度**/
private int headContentHeight;
/**开始的Y坐标**/
private int startY;
/**第一个item**/
private int firstItemIndex;
/**状态**/
private int state;
private boolean isBack;
/**是否要使用下拉刷新功能**/
public boolean showRefresh = true;
public static boolean canRefleash = true;
public ScrollOverListView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init(context);
}
public ScrollOverListView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
public ScrollOverListView(Context context) {
super(context);
init(context);
}
/**出事化控件**/
private void init(Context context) {
mBottomPosition = 0;
setCacheColorHint(0);
inflater = LayoutInflater.from(context);
headView = (LinearLayout) inflater.inflate(R.layout.pull_down_head,
null);
arrowImageView = (ImageView) headView
.findViewById(R.id.head_arrowImageView);
arrowImageView.setMinimumWidth(70);
arrowImageView.setMinimumHeight(50);
progressBar = (ProgressBar) headView
.findViewById(R.id.head_progressBar);
tipsTextview = (TextView) headView.findViewById(R.id.head_tipsTextView);
lastUpdatedTextView = (TextView) headView
.findViewById(R.id.head_lastUpdatedTextView);
measureView(headView);
headContentHeight = headView.getMeasuredHeight();
headView.setPadding(0, -1 * headContentHeight, 0, 0);
headView.invalidate();
/**列表添加头部**/
addHeaderView(headView, null, false);
setOnScrollListener(this);
animation = new RotateAnimation(0, -180,
RotateAnimation.RELATIVE_TO_SELF, 0.5f,
RotateAnimation.RELATIVE_TO_SELF, 0.5f);
animation.setInterpolator(new LinearInterpolator());
animation.setDuration(250);
animation.setFillAfter(true);
reverseAnimation = new RotateAnimation(-180, 0,
RotateAnimation.RELATIVE_TO_SELF, 0.5f,
RotateAnimation.RELATIVE_TO_SELF, 0.5f);
reverseAnimation.setInterpolator(new LinearInterpolator());
reverseAnimation.setDuration(200);
reverseAnimation.setFillAfter(true);
state = DONE;
}
/**触摸事件的处理**/
@Override
public boolean onTouchEvent(MotionEvent ev) {
final int action = ev.getAction();
final int y = (int) ev.getRawY();
cancelLongPress();
switch (action) {
case MotionEvent.ACTION_DOWN: { //按下的时候
if (firstItemIndex == 0 && !isRecored) {
isRecored = true;
startY = (int) ev.getY();
Log.v(TAG, "在down时候记录当前位置‘");
}
// ===========================
mLastY = y;
final boolean isHandled = mOnScrollOverListener.onMotionDown(ev);
if (isHandled) {
mLastY = y;
return isHandled;
}
break;
}
case MotionEvent.ACTION_MOVE: { //手指正在移动的时候
int tempY = (int) ev.getY();
if (showRefresh) {
if (!isRecored && firstItemIndex == 0) {
Log.v(TAG, "在move时候记录下位置");
isRecored = true;
startY = tempY;
}
if (state != REFRESHING && isRecored && state != LOADING) {
// 保证在设置padding的过程中，当前的位置一直是在head，否则如果当列表超出屏幕的话，当在上推的时候，列表会同时进行滚动
// 可以松手去刷新了
if (state == RELEASE_To_REFRESH) {
setSelection(0);
// 往上推了，推到了屏幕足够掩盖head的程度，但是还没有推到全部掩盖的地步
if (((tempY - startY) / RATIO < headContentHeight)
&& (tempY - startY) > 0) {
state = PULL_To_REFRESH;
changeHeaderViewByState();
}
// 一下子推到顶了
else if (tempY - startY <= 0) {
state = DONE;
changeHeaderViewByState();
Log.v(TAG, "由松开刷新状态转变到done状态");
}
// 往下拉了，或者还没有上推到屏幕顶部掩盖head的地步
else {
// 不用进行特别的操作，只用更新paddingTop的值就行了
}
}
// 还没有到达显示松开刷新的时候,DONE或者是PULL_To_REFRESH状态
if (state == PULL_To_REFRESH) {
setSelection(0);
// 下拉到可以进入RELEASE_TO_REFRESH的状态
if ((tempY - startY) / RATIO >= headContentHeight) {
state = RELEASE_To_REFRESH;
isBack = true;
changeHeaderViewByState();
Log.v(TAG, "由done或者下拉刷新状态转变到松开刷新");
}
// 上推到顶了
else if (tempY - startY <= 0) {
state = DONE;
changeHeaderViewByState();
Log.v(TAG, "由DOne或者下拉刷新状态转变到done状态");
}
}
// done状态下
if (state == DONE) {
if (tempY - startY > 0) {
state = PULL_To_REFRESH;
changeHeaderViewByState();
}
}
// 更新headView的size
if (state == PULL_To_REFRESH) {
headView.setPadding(0, -1 * headContentHeight
(tempY - startY) / RATIO, 0, 0);
}
// 更新headView的paddingTop
if (state == RELEASE_To_REFRESH) {
headView.setPadding(0, (tempY - startY) / RATIO
- headContentHeight, 0, 0);
}
}
}
// ==============================================
final int childCount = getChildCount();
if (childCount == 0)
return super.onTouchEvent(ev);
final int itemCount = getAdapter().getCount() - mBottomPosition;
final int deltaY = y - mLastY;
final int lastBottom = getChildAt(childCount - 1).getBottom();
final int end = getHeight() - getPaddingBottom();
final int firstVisiblePosition = getFirstVisiblePosition();
final boolean isHandleMotionMove = mOnScrollOverListener
.onMotionMove(ev, deltaY);
if (isHandleMotionMove) {
mLastY = y;
return true;
}
/** 到达底部 * 到达底部的事件在另外一个类执行**/
if (firstVisiblePosition childCount >= itemCount
&& lastBottom <= end && deltaY < 0) {
final boolean isHandleOnListViewBottomAndPullDown;
isHandleOnListViewBottomAndPullDown = mOnScrollOverListener
.onListViewBottomAndPullUp(deltaY);
if (isHandleOnListViewBottomAndPullDown) {
mLastY = y;
return true;
}
}
break;
}
case MotionEvent.ACTION_UP: { //手指抬起来的时候
if (state != REFRESHING && state != LOADING) {
if (state == DONE) {
// 什么都不做
}
if (state == PULL_To_REFRESH) {
state = DONE;
changeHeaderViewByState();
Log.v(TAG, "由下拉刷新状态，到done状态");
}
if (state == RELEASE_To_REFRESH) {
state = REFRESHING;
changeHeaderViewByState();
canRefleash = true;
Log.v(TAG, "由松开刷新状态，到done状态");
}
}
isRecored = false;
isBack = false;
// /======================
final boolean isHandlerMotionUp = mOnScrollOverListener
.onMotionUp(ev);
if (isHandlerMotionUp) {
mLastY = y;
return true;
}
break;
}
}
mLastY = y;
return super.onTouchEvent(ev);
}
/** 空的 */
private OnScrollOverListener mOnScrollOverListener = new OnScrollOverListener() {
@Override
public boolean onListViewTopAndPullDown(int delta) {
return false;
}
@Override
public boolean onListViewBottomAndPullUp(int delta) {
return false;
}
@Override
public boolean onMotionDown(MotionEvent ev) {
return false;
}
@Override
public boolean onMotionMove(MotionEvent ev, int delta) {
return false;
}
@Override
public boolean onMotionUp(MotionEvent ev) {
return false;
}
};
// =============================== public method
/**
* 可以自定义其中一个条目为头部，头部触发的事件将以这个为准，默认为第一个
*
* @param index 正数第几个，必须在条目数范围之内
*/
public void setTopPosition(int index) {
if (getAdapter() == null)
throw new NullPointerException(
"You must set adapter before setTopPosition!");
if (index < 0)
throw new IllegalArgumentException("Top position must > 0");
}
/**
* 可以自定义其中一个条目为尾部，尾部触发的事件将以这个为准，默认为最后一个
*
* @param index 倒数第几个，必须在条目数范围之内
*/
public void setBottomPosition(int index) {
if (getAdapter() == null)
throw new NullPointerException(
"You must set adapter before setBottonPosition!");
if (index < 0)
throw new IllegalArgumentException("Bottom position must > 0");
mBottomPosition = index;
}
/**
* 设置这个Listener可以监听是否到达顶端，或者是否到达低端等事件</br>
*
* @see OnScrollOverListener
*/
public void setOnScrollOverListener(
OnScrollOverListener onScrollOverListener) {
mOnScrollOverListener = onScrollOverListener;
}
/**
* 滚动监听接口
*
* @see ScrollOverListView#setOnScrollOverListener(OnScrollOverListener)
*
*/
public interface OnScrollOverListener {
/**
* 到达最顶部触发
*
* @param delta
* 手指点击移动产生的偏移量
* @return
*/
boolean onListViewTopAndPullDown(int delta);
/**
* 到达最底部触发
*
* @param delta
* 手指点击移动产生的偏移量
* @return
*/
boolean onListViewBottomAndPullUp(int delta);
/**
* 手指触摸按下触发，相当于{@link MotionEvent#ACTION_DOWN}
*
* @return 返回true表示自己处理
* @see View#onTouchEvent(MotionEvent)
*/
boolean onMotionDown(MotionEvent ev);
/**
* 手指触摸移动触发，相当于{@link MotionEvent#ACTION_MOVE}
*
* @return 返回true表示自己处理
* @see View#onTouchEvent(MotionEvent)
*/
boolean onMotionMove(MotionEvent ev, int delta);
/**
* 手指触摸后提起触发，相当于{@link MotionEvent#ACTION_UP}
*
* @return 返回true表示自己处理
* @see View#onTouchEvent(MotionEvent)
*/
boolean onMotionUp(MotionEvent ev);
}
@Override
public void onScroll(AbsListView arg0, int firstVisiableItem, int arg2,
int arg3) {
firstItemIndex = firstVisiableItem;
}
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
}
// 此方法直接照搬自网络上的一个下拉刷新的demo，此处是“估计”headView的width以及height
private void measureView(View child) {
ViewGroup.LayoutParams p = child.getLayoutParams();
if (p == null) {
p = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
}
int childWidthSpec = ViewGroup.getChildMeasureSpec(0, 0 0, p.width);
int lpHeight = p.height;
int childHeightSpec;
if (lpHeight > 0) {
childHeightSpec = MeasureSpec.makeMeasureSpec(lpHeight,
MeasureSpec.EXACTLY);
} else {
childHeightSpec = MeasureSpec.makeMeasureSpec(0,
MeasureSpec.UNSPECIFIED);
}
child.measure(childWidthSpec, childHeightSpec);
}
public void onRefreshComplete() {
state = DONE;
lastUpdatedTextView.setText("最近更新:" new Date().toLocaleString());
changeHeaderViewByState();
}
// 当状态改变时候，调用该方法，以更新界面
private void changeHeaderViewByState() {
switch (state) {
case RELEASE_To_REFRESH:
arrowImageView.setVisibility(View.VISIBLE);
progressBar.setVisibility(View.GONE);
tipsTextview.setVisibility(View.VISIBLE);
lastUpdatedTextView.setVisibility(View.VISIBLE);
arrowImageView.clearAnimation();
arrowImageView.startAnimation(animation);
tipsTextview.setText("松开刷新");
Log.v(TAG, "当前状态，松开刷新");
break;
case PULL_To_REFRESH:
progressBar.setVisibility(View.GONE);
tipsTextview.setVisibility(View.VISIBLE);
lastUpdatedTextView.setVisibility(View.VISIBLE);
arrowImageView.clearAnimation();
arrowImageView.setVisibility(View.VISIBLE);
// 是由RELEASE_To_REFRESH状态转变来的
if (isBack) {
isBack = false;
arrowImageView.clearAnimation();
arrowImageView.startAnimation(reverseAnimation);
tipsTextview.setText("下拉刷新");
} else {
tipsTextview.setText("下拉刷新");
}
Log.v(TAG, "当前状态，下拉刷新");
break;
case REFRESHING:
headView.setPadding(0, 0, 0, 0);
progressBar.setVisibility(View.VISIBLE);
arrowImageView.clearAnimation();
arrowImageView.setVisibility(View.GONE);
tipsTextview.setText("正在刷新...");
lastUpdatedTextView.setVisibility(View.VISIBLE);
Log.v(TAG, "当前状态,正在刷新...");
break;
case DONE:
headView.setPadding(0, -1 * headContentHeight, 0, 0);
progressBar.setVisibility(View.GONE);
arrowImageView.clearAnimation();
arrowImageView.setImageResource(R.drawable.pull_down_arrow);
tipsTextview.setText("下拉刷新");
lastUpdatedTextView.setVisibility(View.VISIBLE);
Log.v(TAG, "当前状态，done");
break;
}
}
}