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SuperSwipeRefreshLayout.java
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SuperSwipeRefreshLayout.java
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package net.mobctrl.views;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ValueAnimator;
import android.animation.ValueAnimator.AnimatorUpdateListener;
import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.os.Build;
import android.os.Handler;
import android.support.v4.view.MotionEventCompat;
import android.support.v4.view.ViewCompat;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.RecyclerView.LayoutManager;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.Display;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.view.animation.DecelerateInterpolator;
import android.view.animation.Transformation;
import android.widget.AbsListView;
import android.widget.RelativeLayout;
import android.widget.ScrollView;
/**
* @Author Zheng Haibo
* @PersonalWebsite http://www.mobctrl.net
* @Description 自定义CustomeSwipeRefreshLayout<br>
* 支持下拉刷新和上拉加载更多<br>
* 非侵入式，对原来的ListView、RecyclerView没有任何影响,用法和SwipeRefreshLayout类似。<br>
* 可自定义头部View的样式，调用setHeaderView方法即可 <br>
* 可自定义页尾View的样式，调用setFooterView方法即可 <br>
* 支持RecyclerView，ListView，ScrollView，GridView等等。<br>
* 被包含的View(RecyclerView,ListView etc.)可跟随手指的滑动而滑动<br>
* 默认是跟随手指的滑动而滑动，也可以设置为不跟随：setTargetScrollWithLayout(false) 回调方法更多<br>
* 比如：onRefresh() onPullDistance(int distance)和onPullEnable(boolean
* enable)<br>
* 开发人员可以根据下拉过程中distance的值做一系列动画。 <br>
*/
@SuppressLint("ClickableViewAccessibility")
public class SuperSwipeRefreshLayout extends ViewGroup {
private static final String LOG_TAG = "CustomeSwipeRefreshLayout";
private static final int HEADER_VIEW_HEIGHT = 50;// HeaderView height (dp)
private static final float DECELERATE_INTERPOLATION_FACTOR = 2f;
private static final int INVALID_POINTER = -1;
private static final float DRAG_RATE = .5f;
private static final int SCALE_DOWN_DURATION = 150;
private static final int ANIMATE_TO_TRIGGER_DURATION = 200;
private static final int ANIMATE_TO_START_DURATION = 200;
private static final int DEFAULT_CIRCLE_TARGET = 64;
// SuperSwipeRefreshLayout内的目标View，比如RecyclerView,ListView,ScrollView,GridView
// etc.
private View mTarget;
private OnPullRefreshListener mListener;// 下拉刷新listener
private OnPushLoadMoreListener mOnPushLoadMoreListener;// 上拉加载更多
private boolean mRefreshing = false;
private boolean mLoadMore = false;
private int mTouchSlop;
private float mTotalDragDistance = -1;
private int mMediumAnimationDuration;
private int mCurrentTargetOffsetTop;
private boolean mOriginalOffsetCalculated = false;
private float mInitialMotionY;
private boolean mIsBeingDragged;
private int mActivePointerId = INVALID_POINTER;
private boolean mScale;
private boolean mReturningToStart;
private final DecelerateInterpolator mDecelerateInterpolator;
private static final int[] LAYOUT_ATTRS = new int[]{android.R.attr.enabled};
private HeadViewContainer mHeadViewContainer;
private RelativeLayout mFooterViewContainer;
private int mHeaderViewIndex = -1;
private int mFooterViewIndex = -1;
protected int mFrom;
private float mStartingScale;
protected int mOriginalOffsetTop;
private Animation mScaleAnimation;
private Animation mScaleDownAnimation;
private Animation mScaleDownToStartAnimation;
// 最后停顿时的偏移量px，与DEFAULT_CIRCLE_TARGET正比
private float mSpinnerFinalOffset;
private boolean mNotify;
private int mHeaderViewWidth;// headerView的宽度
private int mFooterViewWidth;
private int mHeaderViewHeight;
private int mFooterViewHeight;
private boolean mUsingCustomStart;
private boolean targetScrollWithLayout = true;
private int pushDistance = 0;
private CircleProgressView defaultProgressView = null;
private boolean usingDefaultHeader = true;
private float density = 1.0f;
private boolean isProgressEnable = true;
/**
* 下拉时，超过距离之后，弹回来的动画监听器
*/
private Animation.AnimationListener mRefreshListener = new Animation.AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
isProgressEnable = false;
}
@Override
public void onAnimationRepeat(Animation animation) {
}
@Override
public void onAnimationEnd(Animation animation) {
isProgressEnable = true;
if (mRefreshing) {
if (mNotify) {
if (usingDefaultHeader) {
ViewCompat.setAlpha(defaultProgressView, 1.0f);
defaultProgressView.setOnDraw(true);
new Thread(defaultProgressView).start();
}
if (mListener != null) {
mListener.onRefresh();
}
}
} else {
mHeadViewContainer.setVisibility(View.GONE);
if (mScale) {
setAnimationProgress(0);
} else {
setTargetOffsetTopAndBottom(mOriginalOffsetTop
- mCurrentTargetOffsetTop, true);
}
}
mCurrentTargetOffsetTop = mHeadViewContainer.getTop();
updateListenerCallBack();
}
};
/**
* 更新回调
*/
private void updateListenerCallBack() {
int distance = mCurrentTargetOffsetTop + mHeadViewContainer.getHeight();
if (mListener != null) {
mListener.onPullDistance(distance);
}
if (usingDefaultHeader && isProgressEnable) {
defaultProgressView.setPullDistance(distance);
}
}
/**
* 添加头布局
*
* @param child
*/
public void setHeaderView(View child) {
if (child == null) {
return;
}
if (mHeadViewContainer == null) {
return;
}
usingDefaultHeader = false;
mHeadViewContainer.removeAllViews();
RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(
mHeaderViewWidth, mHeaderViewHeight);
layoutParams.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
mHeadViewContainer.addView(child, layoutParams);
}
public void setFooterView(View child) {
if (child == null) {
return;
}
if (mFooterViewContainer == null) {
return;
}
mFooterViewContainer.removeAllViews();
RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(
mFooterViewWidth, mFooterViewHeight);
mFooterViewContainer.addView(child, layoutParams);
}
public SuperSwipeRefreshLayout(Context context) {
this(context, null);
}
@SuppressWarnings("deprecation")
public SuperSwipeRefreshLayout(Context context, AttributeSet attrs) {
super(context, attrs);
/**
* getScaledTouchSlop是一个距离，表示滑动的时候，手的移动要大于这个距离才开始移动控件。如果小于这个距离就不触发移动控件
*/
mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
mMediumAnimationDuration = getResources().getInteger(
android.R.integer.config_mediumAnimTime);
setWillNotDraw(false);
mDecelerateInterpolator = new DecelerateInterpolator(
DECELERATE_INTERPOLATION_FACTOR);
final TypedArray a = context
.obtainStyledAttributes(attrs, LAYOUT_ATTRS);
setEnabled(a.getBoolean(0, true));
a.recycle();
WindowManager wm = (WindowManager) context
.getSystemService(Context.WINDOW_SERVICE);
Display display = wm.getDefaultDisplay();
final DisplayMetrics metrics = getResources().getDisplayMetrics();
mHeaderViewWidth = (int) display.getWidth();
mFooterViewWidth = (int) display.getWidth();
mHeaderViewHeight = (int) (HEADER_VIEW_HEIGHT * metrics.density);
mFooterViewHeight = (int) (HEADER_VIEW_HEIGHT * metrics.density);
defaultProgressView = new CircleProgressView(getContext());
createHeaderViewContainer();
createFooterViewContainer();
ViewCompat.setChildrenDrawingOrderEnabled(this, true);
mSpinnerFinalOffset = DEFAULT_CIRCLE_TARGET * metrics.density;
density = metrics.density;
mTotalDragDistance = mSpinnerFinalOffset;
}
/**
* 孩子节点绘制的顺序
*
* @param childCount
* @param i
* @return
*/
@Override
protected int getChildDrawingOrder(int childCount, int i) {
// 将新添加的View,放到最后绘制
if (mHeaderViewIndex < 0 && mFooterViewIndex < 0) {
return i;
}
if (i == childCount - 2) {
return mHeaderViewIndex;
}
if (i == childCount - 1) {
return mFooterViewIndex;
}
int bigIndex = mFooterViewIndex > mHeaderViewIndex ? mFooterViewIndex
: mHeaderViewIndex;
int smallIndex = mFooterViewIndex < mHeaderViewIndex ? mFooterViewIndex
: mHeaderViewIndex;
if (i >= smallIndex && i < bigIndex - 1) {
return i + 1;
}
if (i >= bigIndex || (i == bigIndex - 1)) {
return i + 2;
}
return i;
}
/**
* 创建头布局的容器
*/
private void createHeaderViewContainer() {
RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(
(int) (mHeaderViewHeight * 0.8),
(int) (mHeaderViewHeight * 0.8));
layoutParams.addRule(RelativeLayout.CENTER_HORIZONTAL);
layoutParams.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
mHeadViewContainer = new HeadViewContainer(getContext());
mHeadViewContainer.setVisibility(View.GONE);
defaultProgressView.setVisibility(View.VISIBLE);
defaultProgressView.setOnDraw(false);
mHeadViewContainer.addView(defaultProgressView, layoutParams);
addView(mHeadViewContainer);
}
/**
* 添加底部布局
*/
private void createFooterViewContainer() {
mFooterViewContainer = new RelativeLayout(getContext());
mFooterViewContainer.setVisibility(View.GONE);
addView(mFooterViewContainer);
}
/**
* 设置
*
* @param listener
*/
public void setOnPullRefreshListener(OnPullRefreshListener listener) {
mListener = listener;
}
public void setHeaderViewBackgroundColor(int color) {
mHeadViewContainer.setBackgroundColor(color);
}
/**
* 设置上拉加载更多的接口
*
* @param onPushLoadMoreListener
*/
public void setOnPushLoadMoreListener(
OnPushLoadMoreListener onPushLoadMoreListener) {
this.mOnPushLoadMoreListener = onPushLoadMoreListener;
}
/**
* Notify the widget that refresh state has changed. Do not call this when
* refresh is triggered by a swipe gesture.
*
* @param refreshing Whether or not the view should show refresh progress.
*/
public void setRefreshing(boolean refreshing) {
if (refreshing && mRefreshing != refreshing) {
// scale and show
mRefreshing = refreshing;
int endTarget = 0;
if (!mUsingCustomStart) {
endTarget = (int) (mSpinnerFinalOffset + mOriginalOffsetTop);
} else {
endTarget = (int) mSpinnerFinalOffset;
}
setTargetOffsetTopAndBottom(endTarget - mCurrentTargetOffsetTop,
true /* requires update */);
mNotify = false;
startScaleUpAnimation(mRefreshListener);
} else {
setRefreshing(refreshing, false /* notify */);
if (usingDefaultHeader) {
defaultProgressView.setOnDraw(false);
}
}
}
private void startScaleUpAnimation(AnimationListener listener) {
mHeadViewContainer.setVisibility(View.VISIBLE);
mScaleAnimation = new Animation() {
@Override
public void applyTransformation(float interpolatedTime,
Transformation t) {
setAnimationProgress(interpolatedTime);
}
};
mScaleAnimation.setDuration(mMediumAnimationDuration);
if (listener != null) {
mHeadViewContainer.setAnimationListener(listener);
}
mHeadViewContainer.clearAnimation();
mHeadViewContainer.startAnimation(mScaleAnimation);
}
private void setAnimationProgress(float progress) {
if (!usingDefaultHeader) {
progress = 1;
}
ViewCompat.setScaleX(mHeadViewContainer, progress);
ViewCompat.setScaleY(mHeadViewContainer, progress);
}
private void setRefreshing(boolean refreshing, final boolean notify) {
if (mRefreshing != refreshing) {
mNotify = notify;
ensureTarget();
mRefreshing = refreshing;
if (mRefreshing) {
animateOffsetToCorrectPosition(mCurrentTargetOffsetTop,
mRefreshListener);
} else {
startScaleDownAnimation(mRefreshListener);
}
}
}
private void startScaleDownAnimation(Animation.AnimationListener listener) {
mScaleDownAnimation = new Animation() {
@Override
public void applyTransformation(float interpolatedTime,
Transformation t) {
setAnimationProgress(1 - interpolatedTime);
}
};
mScaleDownAnimation.setDuration(SCALE_DOWN_DURATION);
mHeadViewContainer.setAnimationListener(listener);
mHeadViewContainer.clearAnimation();
mHeadViewContainer.startAnimation(mScaleDownAnimation);
}
public boolean isRefreshing() {
return mRefreshing;
}
/**
* 确保mTarget不为空<br>
* mTarget一般是可滑动的ScrollView,ListView,RecyclerView等
*/
private void ensureTarget() {
if (mTarget == null) {
for (int i = 0; i < getChildCount(); i++) {
View child = getChildAt(i);
if (!child.equals(mHeadViewContainer)
&& !child.equals(mFooterViewContainer)) {
mTarget = child;
break;
}
}
}
}
/**
* Set the distance to trigger a sync in dips
*
* @param distance
*/
public void setDistanceToTriggerSync(int distance) {
mTotalDragDistance = distance;
}
@Override
protected void onLayout(boolean changed, int left, int top, int right,
int bottom) {
final int width = getMeasuredWidth();
final int height = getMeasuredHeight();
if (getChildCount() == 0) {
return;
}
if (mTarget == null) {
ensureTarget();
}
if (mTarget == null) {
return;
}
int distance = mCurrentTargetOffsetTop + mHeadViewContainer.getHeight();
if (!targetScrollWithLayout) {
// 判断标志位，如果目标View不跟随手指的滑动而滑动，将下拉偏移量设置为0
distance = 0;
}
final View child = mTarget;
final int childLeft = getPaddingLeft();
final int childTop = getPaddingTop() + distance - pushDistance;// 根据偏移量distance更新
final int childWidth = width - getPaddingLeft() - getPaddingRight();
final int childHeight = height - getPaddingTop() - getPaddingBottom();
Log.d(LOG_TAG, "debug:onLayout childHeight = " + childHeight);
child.layout(childLeft, childTop, childLeft + childWidth, childTop
+ childHeight);// 更新目标View的位置
int headViewWidth = mHeadViewContainer.getMeasuredWidth();
int headViewHeight = mHeadViewContainer.getMeasuredHeight();
mHeadViewContainer.layout((width / 2 - headViewWidth / 2),
mCurrentTargetOffsetTop, (width / 2 + headViewWidth / 2),
mCurrentTargetOffsetTop + headViewHeight);// 更新头布局的位置
int footViewWidth = mFooterViewContainer.getMeasuredWidth();
int footViewHeight = mFooterViewContainer.getMeasuredHeight();
mFooterViewContainer.layout((width / 2 - footViewWidth / 2), height
- pushDistance, (width / 2 + footViewWidth / 2), height
+ footViewHeight - pushDistance);
}
@Override
public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
if (mTarget == null) {
ensureTarget();
}
if (mTarget == null) {
return;
}
mTarget.measure(MeasureSpec.makeMeasureSpec(getMeasuredWidth()
- getPaddingLeft() - getPaddingRight(), MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(getMeasuredHeight()
- getPaddingTop() - getPaddingBottom(),
MeasureSpec.EXACTLY));
mHeadViewContainer.measure(MeasureSpec.makeMeasureSpec(
mHeaderViewWidth, MeasureSpec.EXACTLY), MeasureSpec
.makeMeasureSpec(3 * mHeaderViewHeight, MeasureSpec.EXACTLY));
mFooterViewContainer.measure(MeasureSpec.makeMeasureSpec(
mFooterViewWidth, MeasureSpec.EXACTLY), MeasureSpec
.makeMeasureSpec(mFooterViewHeight, MeasureSpec.EXACTLY));
if (!mUsingCustomStart && !mOriginalOffsetCalculated) {
mOriginalOffsetCalculated = true;
mCurrentTargetOffsetTop = mOriginalOffsetTop = -mHeadViewContainer
.getMeasuredHeight();
updateListenerCallBack();
}
mHeaderViewIndex = -1;
for (int index = 0; index < getChildCount(); index++) {
if (getChildAt(index) == mHeadViewContainer) {
mHeaderViewIndex = index;
break;
}
}
mFooterViewIndex = -1;
for (int index = 0; index < getChildCount(); index++) {
if (getChildAt(index) == mFooterViewContainer) {
mFooterViewIndex = index;
break;
}
}
}
/**
* 判断目标View是否滑动到顶部-还能否继续滑动
*
* @return
*/
public boolean isChildScrollToTop() {
if (android.os.Build.VERSION.SDK_INT < 14) {
if (mTarget instanceof AbsListView) {
final AbsListView absListView = (AbsListView) mTarget;
return !(absListView.getChildCount() > 0 && (absListView
.getFirstVisiblePosition() > 0 || absListView
.getChildAt(0).getTop() < absListView.getPaddingTop()));
} else {
return !(mTarget.getScrollY() > 0);
}
} else {
return !ViewCompat.canScrollVertically(mTarget, -1);
}
}
/**
* 是否滑动到底部
*
* @return
*/
public boolean isChildScrollToBottom() {
if (isChildScrollToTop()) {
return false;
}
if (mTarget instanceof RecyclerView) {
RecyclerView recyclerView = (RecyclerView) mTarget;
LayoutManager layoutManager = recyclerView.getLayoutManager();
int count = recyclerView.getAdapter().getItemCount();
if (layoutManager instanceof LinearLayoutManager && count > 0) {
LinearLayoutManager linearLayoutManager = (LinearLayoutManager) layoutManager;
if (linearLayoutManager.findLastCompletelyVisibleItemPosition() == count - 1) {
return true;
}
} else if (layoutManager instanceof StaggeredGridLayoutManager) {
StaggeredGridLayoutManager staggeredGridLayoutManager = (StaggeredGridLayoutManager) layoutManager;
int[] lastItems = new int[2];
staggeredGridLayoutManager
.findLastCompletelyVisibleItemPositions(lastItems);
int lastItem = Math.max(lastItems[0], lastItems[1]);
if (lastItem == count - 1) {
return true;
}
}
return false;
} else if (mTarget instanceof AbsListView) {
final AbsListView absListView = (AbsListView) mTarget;
int count = absListView.getAdapter().getCount();
int fristPos = absListView.getFirstVisiblePosition();
if (fristPos == 0
&& absListView.getChildAt(0).getTop() >= absListView
.getPaddingTop()) {
return false;
}
int lastPos = absListView.getLastVisiblePosition();
if (lastPos > 0 && count > 0 && lastPos == count - 1) {
return true;
}
return false;
} else if (mTarget instanceof ScrollView) {
ScrollView scrollView = (ScrollView) mTarget;
View view = (View) scrollView
.getChildAt(scrollView.getChildCount() - 1);
if (view != null) {
int diff = (view.getBottom() - (scrollView.getHeight() + scrollView
.getScrollY()));
if (diff == 0) {
return true;
}
}
}
return false;
}
/**
* 主要判断是否应该拦截子View的事件<br>
* 如果拦截，则交给自己的OnTouchEvent处理<br>
* 否者，交给子View处理<br>
*/
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
ensureTarget();
final int action = MotionEventCompat.getActionMasked(ev);
if (mReturningToStart && action == MotionEvent.ACTION_DOWN) {
mReturningToStart = false;
}
if (!isEnabled() || mReturningToStart || mRefreshing || mLoadMore
|| (!isChildScrollToTop() && !isChildScrollToBottom())) {
// 如果子View可以滑动，不拦截事件，交给子View处理-下拉刷新
// 或者子View没有滑动到底部不拦截事件-上拉加载更多
return false;
}
// 下拉刷新判断
switch (action) {
case MotionEvent.ACTION_DOWN:
setTargetOffsetTopAndBottom(
mOriginalOffsetTop - mHeadViewContainer.getTop(), true);// 恢复HeaderView的初始位置
mActivePointerId = MotionEventCompat.getPointerId(ev, 0);
mIsBeingDragged = false;
final float initialMotionY = getMotionEventY(ev, mActivePointerId);
if (initialMotionY == -1) {
return false;
}
mInitialMotionY = initialMotionY;// 记录按下的位置
case MotionEvent.ACTION_MOVE:
if (mActivePointerId == INVALID_POINTER) {
Log.e(LOG_TAG,
"Got ACTION_MOVE event but don't have an active pointer id.");
return false;
}
final float y = getMotionEventY(ev, mActivePointerId);
if (y == -1) {
return false;
}
float yDiff = 0;
if (isChildScrollToBottom()) {
yDiff = mInitialMotionY - y;// 计算上拉距离
if (yDiff > mTouchSlop && !mIsBeingDragged) {// 判断是否下拉的距离足够
mIsBeingDragged = true;// 正在上拉
}
} else {
yDiff = y - mInitialMotionY;// 计算下拉距离
if (yDiff > mTouchSlop && !mIsBeingDragged) {// 判断是否下拉的距离足够
mIsBeingDragged = true;// 正在下拉
}
}
break;
case MotionEventCompat.ACTION_POINTER_UP:
onSecondaryPointerUp(ev);
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
mIsBeingDragged = false;
mActivePointerId = INVALID_POINTER;
break;
}
return mIsBeingDragged;// 如果正在拖动，则拦截子View的事件
}
private float getMotionEventY(MotionEvent ev, int activePointerId) {
final int index = MotionEventCompat.findPointerIndex(ev,
activePointerId);
if (index < 0) {
return -1;
}
return MotionEventCompat.getY(ev, index);
}
@Override
public void requestDisallowInterceptTouchEvent(boolean b) {
// Nope.
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
final int action = MotionEventCompat.getActionMasked(ev);
if (mReturningToStart && action == MotionEvent.ACTION_DOWN) {
mReturningToStart = false;
}
if (!isEnabled() || mReturningToStart
|| (!isChildScrollToTop() && !isChildScrollToBottom())) {
// 如果子View可以滑动，不拦截事件，交给子View处理
return false;
}
if (isChildScrollToBottom()) {// 上拉加载更多
return handlerPushTouchEvent(ev, action);
} else {// 下拉刷新
return handlerPullTouchEvent(ev, action);
}
}
private boolean handlerPullTouchEvent(MotionEvent ev, int action) {
switch (action) {
case MotionEvent.ACTION_DOWN:
mActivePointerId = MotionEventCompat.getPointerId(ev, 0);
mIsBeingDragged = false;
break;
case MotionEvent.ACTION_MOVE: {
final int pointerIndex = MotionEventCompat.findPointerIndex(ev,
mActivePointerId);
if (pointerIndex < 0) {
Log.e(LOG_TAG,
"Got ACTION_MOVE event but have an invalid active pointer id.");
return false;
}
final float y = MotionEventCompat.getY(ev, pointerIndex);
final float overscrollTop = (y - mInitialMotionY) * DRAG_RATE;
if (mIsBeingDragged) {
float originalDragPercent = overscrollTop / mTotalDragDistance;
if (originalDragPercent < 0) {
return false;
}
float dragPercent = Math.min(1f, Math.abs(originalDragPercent));
float extraOS = Math.abs(overscrollTop) - mTotalDragDistance;
float slingshotDist = mUsingCustomStart ? mSpinnerFinalOffset
- mOriginalOffsetTop : mSpinnerFinalOffset;
float tensionSlingshotPercent = Math.max(0,
Math.min(extraOS, slingshotDist * 2) / slingshotDist);
float tensionPercent = (float) ((tensionSlingshotPercent / 4) - Math
.pow((tensionSlingshotPercent / 4), 2)) * 2f;
float extraMove = (slingshotDist) * tensionPercent * 2;
int targetY = mOriginalOffsetTop
+ (int) ((slingshotDist * dragPercent) + extraMove);
if (mHeadViewContainer.getVisibility() != View.VISIBLE) {
mHeadViewContainer.setVisibility(View.VISIBLE);
}
if (!mScale) {
ViewCompat.setScaleX(mHeadViewContainer, 1f);
ViewCompat.setScaleY(mHeadViewContainer, 1f);
}
if (usingDefaultHeader) {
float alpha = overscrollTop / mTotalDragDistance;
if (alpha >= 1.0f) {
alpha = 1.0f;
}
ViewCompat.setScaleX(defaultProgressView, alpha);
ViewCompat.setScaleY(defaultProgressView, alpha);
ViewCompat.setAlpha(defaultProgressView, alpha);
}
if (overscrollTop < mTotalDragDistance) {
if (mScale) {
setAnimationProgress(overscrollTop / mTotalDragDistance);
}
if (mListener != null) {
mListener.onPullEnable(false);
}
} else {
if (mListener != null) {
mListener.onPullEnable(true);
}
}
setTargetOffsetTopAndBottom(targetY - mCurrentTargetOffsetTop,
true);
}
break;
}
case MotionEventCompat.ACTION_POINTER_DOWN: {
final int index = MotionEventCompat.getActionIndex(ev);
mActivePointerId = MotionEventCompat.getPointerId(ev, index);
break;
}
case MotionEventCompat.ACTION_POINTER_UP:
onSecondaryPointerUp(ev);
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL: {
if (mActivePointerId == INVALID_POINTER) {
if (action == MotionEvent.ACTION_UP) {
Log.e(LOG_TAG,
"Got ACTION_UP event but don't have an active pointer id.");
}
return false;
}
final int pointerIndex = MotionEventCompat.findPointerIndex(ev,
mActivePointerId);
final float y = MotionEventCompat.getY(ev, pointerIndex);
final float overscrollTop = (y - mInitialMotionY) * DRAG_RATE;
mIsBeingDragged = false;
if (overscrollTop > mTotalDragDistance) {
setRefreshing(true, true /* notify */);
} else {
mRefreshing = false;
Animation.AnimationListener listener = null;
if (!mScale) {
listener = new Animation.AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
}
@Override
public void onAnimationEnd(Animation animation) {
if (!mScale) {
startScaleDownAnimation(null);
}
}
@Override
public void onAnimationRepeat(Animation animation) {
}
};
}
animateOffsetToStartPosition(mCurrentTargetOffsetTop, listener);
}
mActivePointerId = INVALID_POINTER;
return false;
}
}
return true;
}
/**
* 处理上拉加载更多的Touch事件
*
* @param ev
* @param action
* @return
*/
private boolean handlerPushTouchEvent(MotionEvent ev, int action) {
switch (action) {
case MotionEvent.ACTION_DOWN:
mActivePointerId = MotionEventCompat.getPointerId(ev, 0);
mIsBeingDragged = false;
Log.d(LOG_TAG, "debug:onTouchEvent ACTION_DOWN");
break;
case MotionEvent.ACTION_MOVE: {
final int pointerIndex = MotionEventCompat.findPointerIndex(ev,
mActivePointerId);
if (pointerIndex < 0) {
Log.e(LOG_TAG,
"Got ACTION_MOVE event but have an invalid active pointer id.");
return false;
}
final float y = MotionEventCompat.getY(ev, pointerIndex);
final float overscrollBottom = (mInitialMotionY - y) * DRAG_RATE;
if (mIsBeingDragged) {
pushDistance = (int) overscrollBottom;
updateFooterViewPosition();
if (mOnPushLoadMoreListener != null) {
mOnPushLoadMoreListener
.onPushEnable(pushDistance >= mFooterViewHeight);
}
}
break;
}
case MotionEventCompat.ACTION_POINTER_DOWN: {
final int index = MotionEventCompat.getActionIndex(ev);
mActivePointerId = MotionEventCompat.getPointerId(ev, index);
break;
}
case MotionEventCompat.ACTION_POINTER_UP:
onSecondaryPointerUp(ev);
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL: {
if (mActivePointerId == INVALID_POINTER) {
if (action == MotionEvent.ACTION_UP) {
Log.e(LOG_TAG,
"Got ACTION_UP event but don't have an active pointer id.");
}
return false;
}
final int pointerIndex = MotionEventCompat.findPointerIndex(ev,
mActivePointerId);
final float y = MotionEventCompat.getY(ev, pointerIndex);
final float overscrollBottom = (mInitialMotionY - y) * DRAG_RATE;// 松手是下拉的距离
mIsBeingDragged = false;
mActivePointerId = INVALID_POINTER;
if (overscrollBottom < mFooterViewHeight
|| mOnPushLoadMoreListener == null) {// 直接取消
pushDistance = 0;
} else {// 下拉到mFooterViewHeight
pushDistance = mFooterViewHeight;
}
if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.HONEYCOMB) {
updateFooterViewPosition();
if (pushDistance == mFooterViewHeight
&& mOnPushLoadMoreListener != null) {
mLoadMore = true;
mOnPushLoadMoreListener.onLoadMore();
}
} else {
animatorFooterToBottom((int) overscrollBottom, pushDistance);
}
return false;
}
}
return true;
}
/**
* 松手之后，使用动画将Footer从距离start变化到end
*
* @param start
* @param end
*/
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
private void animatorFooterToBottom(int start, final int end) {
ValueAnimator valueAnimator = ValueAnimator.ofInt(start, end);
valueAnimator.setDuration(150);
valueAnimator.addUpdateListener(new AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
// update
pushDistance = (Integer) valueAnimator.getAnimatedValue();
updateFooterViewPosition();
}
});
valueAnimator.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
if (end > 0 && mOnPushLoadMoreListener != null) {
// start loading more
mLoadMore = true;
mOnPushLoadMoreListener.onLoadMore();
} else {
resetTargetLayout();
mLoadMore = false;
}
}
});
valueAnimator.setInterpolator(mDecelerateInterpolator);
valueAnimator.start();
}
/**
* 设置停止加载
*
* @param loadMore
*/
public void setLoadMore(boolean loadMore) {
if (!loadMore && mLoadMore) {// 停止加载
if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.HONEYCOMB) {
mLoadMore = false;
pushDistance = 0;
updateFooterViewPosition();
} else {
animatorFooterToBottom(mFooterViewHeight, 0);
}
}
}
private void animateOffsetToCorrectPosition(int from,
AnimationListener listener) {
mFrom = from;
mAnimateToCorrectPosition.reset();
mAnimateToCorrectPosition.setDuration(ANIMATE_TO_TRIGGER_DURATION);
mAnimateToCorrectPosition.setInterpolator(mDecelerateInterpolator);
if (listener != null) {
mHeadViewContainer.setAnimationListener(listener);
}
mHeadViewContainer.clearAnimation();
mHeadViewContainer.startAnimation(mAnimateToCorrectPosition);
}
private void animateOffsetToStartPosition(int from,
AnimationListener listener) {
if (mScale) {