package com.yuyh.sprintnba.widget;
import android.content.Context;
import android.content.res.TypedArray;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.widget.RecyclerView;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.VelocityTracker;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.OverScroller;
import android.widget.ScrollView;
import com.yuyh.sprintnba.R;
import com.yuyh.sprintnba.base.BaseFragment;
import com.yuyh.library.view.viewpager.indicator.FragmentListPageAdapter;
public class StickyNavLayout extends LinearLayout {
private static final String TAG = "StickyNavLayout";
private View mTop;
private View mNav;
private ViewPager mViewPager;
private int mTopViewHeight;
private ViewGroup mInnerScrollView;
private boolean isTopHidden = false;
private OverScroller mScroller;
private VelocityTracker mVelocityTracker;
private int mTouchSlop;
private int mMaximumVelocity, mMinimumVelocity;
private float mLastY;
private boolean mDragging;
private boolean isStickNav;
private boolean isInControl = false;
private int stickOffset;
private int mViewPagerMaxHeight;
private int mTopViewMaxHeight;
public StickyNavLayout(Context context) {
this(context, null);
}
public StickyNavLayout(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public StickyNavLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
setOrientation(LinearLayout.VERTICAL);
TypedArray a = context.obtainStyledAttributes(attrs,
R.styleable.StickNavLayout);
isStickNav = a.getBoolean(R.styleable.StickNavLayout_isStickNav, false);
stickOffset = a.getDimensionPixelSize(R.styleable.StickNavLayout_stickOffset, 0);
a.recycle();
mScroller = new OverScroller(context);
mVelocityTracker = VelocityTracker.obtain();
mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
mMaximumVelocity = ViewConfiguration.get(context)
.getScaledMaximumFlingVelocity();
mMinimumVelocity = ViewConfiguration.get(context)
.getScaledMinimumFlingVelocity();
}
public void setIsStickNav(boolean isStickNav) {
this.isStickNav = isStickNav;
}
/**
* 设置悬浮,并自动滚动到悬浮位置(即把top区域滚动上去)
*/
public void setStickNavAndScrollToNav() {
this.isStickNav = true;
scrollTo(0, mTopViewHeight);
}
/****
* 设置顶部区域的高度
*
* @param height height
*/
public void setTopViewHeight(int height) {
mTopViewHeight = height;
if (isStickNav)
scrollTo(0, mTopViewHeight);
}
/****
* 设置顶部区域的高度
*
* @param height height
* @param offset offset
*/
public void setTopViewHeight(int height, int offset) {
mTopViewHeight = height;
if (isStickNav)
scrollTo(0, mTopViewHeight - offset);
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
mTop = findViewById(R.id.snlTopview);
mNav = findViewById(R.id.snlIindicator);
View view = findViewById(R.id.snlViewPager);
if (!(view instanceof ViewPager)) {
throw new RuntimeException(
"id_stickynavlayout_viewpager show used by ViewPager !");
} else if (mTop instanceof ViewGroup) {
ViewGroup viewGroup = (ViewGroup) mTop;
if (viewGroup.getChildCount() >= 2) {
throw new RuntimeException(
"if the TopView(android:id=\"R.id.id_stickynavlayout_topview\") is a ViewGroup(ScrollView,LinearLayout,FrameLayout, ....) ,the children count should be one !");
}
}
mViewPager = (ViewPager) view;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
ViewGroup.LayoutParams params = mViewPager.getLayoutParams();
//修复键盘弹出后键盘关闭布局高度不对问题
int height = getMeasuredHeight() - mNav.getMeasuredHeight();
mViewPagerMaxHeight = (height >= mViewPagerMaxHeight ? height : mViewPagerMaxHeight);
params.height = /*mViewPagerMaxHeight - stickOffset*/height;
mViewPager.setLayoutParams(params);
//修复键盘弹出后Top高度不对问题
int topHeight = mTop.getMeasuredHeight();
ViewGroup.LayoutParams topParams = mTop.getLayoutParams();
mTopViewMaxHeight = (topHeight >= mTopViewMaxHeight ? topHeight : mTopViewMaxHeight);
topParams.height = /*mTopViewMaxHeight*/topHeight;
mTop.setLayoutParams(topParams);
//设置mTopViewHeight
mTopViewHeight = topParams.height;
}
/**
* 更新top区域的视图,如果是处于悬浮状态,隐藏top区域的控件是不起作用的!!
*/
public void updateTopViews() {
if (isTopHidden) {
return;
}
final ViewGroup.LayoutParams params = mTop.getLayoutParams();
mTop.post(new Runnable() {
@Override
public void run() {
if (mTop instanceof ViewGroup) {
ViewGroup viewGroup = (ViewGroup) mTop;
int height = viewGroup.getChildAt(0).getHeight();
mTopViewHeight = height - stickOffset;
params.height = height;
mTop.setLayoutParams(params);
params.height = ViewGroup.LayoutParams.WRAP_CONTENT;
} else {
mTopViewHeight = mTop.getMeasuredHeight() - stickOffset;
}
}
});
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
final ViewGroup.LayoutParams params = mTop.getLayoutParams();
Log.d(TAG, "onSizeChanged-mTopViewHeight:" + mTopViewHeight);
mTop.post(new Runnable() {
@Override
public void run() {
if (mTop instanceof ViewGroup) {
ViewGroup viewGroup = (ViewGroup) mTop;
int height = viewGroup.getChildAt(0).getHeight();
mTopViewHeight = height - stickOffset;
params.height = height;
mTop.setLayoutParams(params);
mTop.requestLayout();
} else {
mTopViewHeight = mTop.getMeasuredHeight() - stickOffset;
}
Log.d(TAG, "mTopViewHeight:" + mTopViewHeight);
if (null != mInnerScrollView) {
Log.d(TAG, "mInnerScrollViewHeight:" + mInnerScrollView.getMeasuredHeight());
}
if (isStickNav) {
scrollTo(0, mTopViewHeight);
}
}
});
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
int action = ev.getAction();
float y = ev.getY();
switch (action) {
case MotionEvent.ACTION_DOWN:
mLastY = y;
break;
case MotionEvent.ACTION_MOVE:
float dy = y - mLastY;
getCurrentScrollView();
if (mInnerScrollView instanceof ScrollView) {
if (mInnerScrollView.getScrollY() == 0 && isTopHidden && dy > 0
&& !isInControl) {
isInControl = true;
ev.setAction(MotionEvent.ACTION_CANCEL);
MotionEvent ev2 = MotionEvent.obtain(ev);
dispatchTouchEvent(ev);
ev2.setAction(MotionEvent.ACTION_DOWN);
isSticky = true;
return dispatchTouchEvent(ev2);
}
} else if (mInnerScrollView instanceof ListView) {
ListView lv = (ListView) mInnerScrollView;
View c = lv.getChildAt(lv.getFirstVisiblePosition());
if (!isInControl && c != null && c.getTop() == 0 && isTopHidden
&& dy > 0) {
isInControl = true;
ev.setAction(MotionEvent.ACTION_CANCEL);
MotionEvent ev2 = MotionEvent.obtain(ev);
dispatchTouchEvent(ev);
ev2.setAction(MotionEvent.ACTION_DOWN);
isSticky = true;
return dispatchTouchEvent(ev2);
}
} else if (mInnerScrollView instanceof RecyclerView) {
RecyclerView rv = (RecyclerView) mInnerScrollView;
if (!isInControl && android.support.v4.view.ViewCompat.canScrollVertically(rv, -1) && isTopHidden
&& dy > 0) {
isInControl = true;
ev.setAction(MotionEvent.ACTION_CANCEL);
MotionEvent ev2 = MotionEvent.obtain(ev);
dispatchTouchEvent(ev);
ev2.setAction(MotionEvent.ACTION_DOWN);
isSticky = true;
return dispatchTouchEvent(ev2);
}
}
break;
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP://处理悬停后立刻抬起的处理
float distance = y - mLastY;
if (isSticky && /*distance==0.0f*/Math.abs(distance) <= mTouchSlop) {
isSticky = false;
return true;
} else {
isSticky = false;
return super.dispatchTouchEvent(ev);
}
}
return super.dispatchTouchEvent(ev);
}
private boolean isSticky;//mNav-view 是否悬停的标志
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
int action = ev.getAction();
float y = ev.getY();
switch (action) {
case MotionEvent.ACTION_DOWN:
mLastY = y;
break;
case MotionEvent.ACTION_MOVE:
float dy = y - mLastY;
getCurrentScrollView();
if (Math.abs(dy) > mTouchSlop) {
mDragging = true;
if (mInnerScrollView instanceof ScrollView) {
// 如果topView没有隐藏
// 或sc的scrollY = 0 && topView隐藏 && 下拉，则拦截
if (!isTopHidden
|| (mInnerScrollView.getScrollY() == 0 && isTopHidden && dy > 0)) {
initVelocityTrackerIfNotExists();
mVelocityTracker.addMovement(ev);
mLastY = y;
return true;
}
} else if (mInnerScrollView instanceof ListView) {
ListView lv = (ListView) mInnerScrollView;
View c = lv.getChildAt(lv.getFirstVisiblePosition());
if (!isTopHidden
|| (c != null && c.getTop() == 0 && isTopHidden && dy > 0)) {
initVelocityTrackerIfNotExists();
mVelocityTracker.addMovement(ev);
mLastY = y;
return true;
} else {
if (lv.getAdapter() != null && lv.getAdapter().getCount() == 0) {//当ListView或ScrollView 没有数据为空时
initVelocityTrackerIfNotExists();
mVelocityTracker.addMovement(ev);
mLastY = y;
return true;
}
}
} else if (mInnerScrollView instanceof RecyclerView) {
RecyclerView rv = (RecyclerView) mInnerScrollView;
if (!isTopHidden || (!android.support.v4.view.ViewCompat.canScrollVertically(rv, -1) && isTopHidden && dy > 0)) {
initVelocityTrackerIfNotExists();
mVelocityTracker.addMovement(ev);
mLastY = y;
return true;
}
}
}
break;
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
mDragging = false;
recycleVelocityTracker();
break;
}
return super.onInterceptTouchEvent(ev);
}
private void getCurrentScrollView() {
int currentItem = mViewPager.getCurrentItem();
PagerAdapter a = mViewPager.getAdapter();
if (a instanceof FragmentPagerAdapter) {
FragmentPagerAdapter fadapter = (FragmentPagerAdapter) a;
Fragment item = fadapter.getItem(currentItem);
View v = item.getView();
if (v != null) {
mInnerScrollView = (ViewGroup) (v.findViewById(R.id.snlScrollView));
}
} else if (a instanceof FragmentStatePagerAdapter) {
FragmentStatePagerAdapter fsAdapter = (FragmentStatePagerAdapter) a;
Fragment item = fsAdapter.getItem(currentItem);
View v = item.getView();
if (v != null) {
mInnerScrollView = (ViewGroup) (v.findViewById(R.id.snlScrollView));
}
} else if(a instanceof PagerAdapter){
FragmentListPageAdapter adapter = (FragmentListPageAdapter)a;
BaseFragment item = (BaseFragment) adapter.getExitFragment(currentItem);
View v = item.getContentView();
if (v != null) {
mInnerScrollView = (ViewGroup) (v.findViewById(R.id.snlScrollView));
}
} else {
//throw new RuntimeException("mViewPager should be used FragmentPagerAdapter or FragmentStatePagerAdapter !");
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
initVelocityTrackerIfNotExists();
mVelocityTracker.addMovement(event);
int action = event.getAction();
float y = event.getY();
switch (action) {
case MotionEvent.ACTION_DOWN:
if (!mScroller.isFinished())
mScroller.abortAnimation();
mLastY = y;
return true;
case MotionEvent.ACTION_MOVE:
float dy = y - mLastY;
if (!mDragging && Math.abs(dy) > mTouchSlop) {
mDragging = true;
}
if (mDragging) {
scrollBy(0, (int) -dy);
// 如果topView隐藏，且上滑动时，则改变当前事件为ACTION_DOWN
if (getScrollY() == mTopViewHeight && dy < 0) {
event.setAction(MotionEvent.ACTION_DOWN);
dispatchTouchEvent(event);
isInControl = false;
isSticky = true;
} else {
isSticky = false;
}
}
mLastY = y;
break;
case MotionEvent.ACTION_CANCEL:
mDragging = false;
recycleVelocityTracker();
if (!mScroller.isFinished()) {
mScroller.abortAnimation();
}
break;
case MotionEvent.ACTION_UP:
mDragging = false;
mVelocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
int velocityY = (int) mVelocityTracker.getYVelocity();
if (Math.abs(velocityY) > mMinimumVelocity) {
fling(-velocityY);
}
recycleVelocityTracker();
break;
}
return super.onTouchEvent(event);
}
public void fling(int velocityY) {
mScroller.fling(0, getScrollY(), 0, velocityY, 0, 0, 0, mTopViewHeight);
invalidate();
}
@Override
public void scrollTo(int x, int y) {
if (y < 0) {
y = 0;
}
if (y > mTopViewHeight) {
y = mTopViewHeight;
}
if (y != getScrollY()) {
super.scrollTo(x, y);
}
isTopHidden = getScrollY() == mTopViewHeight;
//set listener 设置悬浮监听回调
if (listener != null) {
// if(lastIsTopHidden!=isTopHidden){
// lastIsTopHidden=isTopHidden;
listener.isStick(isTopHidden);
// }
listener.scrollPercent((float) getScrollY() / (float) mTopViewHeight);
}
}
// private boolean lastIsTopHidden;//记录上次是否悬浮
@Override
public void computeScroll() {
if (mScroller.computeScrollOffset()) {
scrollTo(0, mScroller.getCurrY());
postInvalidate();
}
}
private void initVelocityTrackerIfNotExists() {
if (mVelocityTracker == null) {
mVelocityTracker = VelocityTracker.obtain();
}
}
private void recycleVelocityTracker() {
if (mVelocityTracker != null) {
mVelocityTracker.recycle();
mVelocityTracker = null;
}
}
private OnStickStateChangeListener listener;
/**
* 悬浮状态回调
*/
public interface OnStickStateChangeListener {
/**
* 是否悬浮的回调
*
* @param isStick true 悬浮 ,false 没有悬浮
*/
void isStick(boolean isStick);
/**
* 距离悬浮的距离的百分比
*
* @param percent 0~1(向上) or 1~0(向下) 的浮点数
*/
void scrollPercent(float percent);
}
public void setOnStickStateChangeListener(OnStickStateChangeListener listener) {
this.listener = listener;
}
}