ParallaxHeaderViewPager改进

ParallaxHeaderViewPager项目头部控件如果设置了事件，HeaderFameLayout.dispatchTouchEvent方法就会返回true，OuterFameLayout.dispatchTouchEvent方法就不会继续分配事件，导致viewpager接收不到事件，listview就不能滚动。

如果想在设置了点击事件的控件上滑动时，viewpager也能接收事件，需从下面几个点出发：

1、HeaderFameLayout.dispatchTouchEvent返回true时，OuterFameLayout.dispatchTouchEvent方法中手动调用viewpager.dispatchTouchEvent方法。

2、滚动的时候不触发HeaderFameLayout中的click事件，HeaderFameLayout.dispatchTouchEvent中需要判断，如果是滚动就直接返回，并取消之前的down，move事件。

3、HeaderViewPager.dispatchTouchEvent中需要对异常进行捕捉

具体代码：

布局文件

<?xml version="1.0" encoding="utf-8"?><com.astuetz.OuterFameLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/outer"android:layout_width="match_parent"android:layout_height="match_parent" ><com.astuetz.HeaderViewPagerandroid:id="@+id/pager"android:layout_width="match_parent"android:layout_height="match_parent" /><com.astuetz.HeaderFameLayoutandroid:id="@+id/header"android:layout_width="match_parent"android:layout_height="@dimen/header_height" ><com.flavienlaurent.notboringactionbar.KenBurnsSupportViewandroid:id="@+id/header_picture"android:layout_width="match_parent"android:layout_height="match_parent" /><ImageViewandroid:id="@+id/header_logo"android:layout_width="@dimen/header_logo_size"android:layout_height="@dimen/header_logo_size"android:layout_gravity="center"android:src="@drawable/ic_header_logo" /><com.astuetz.PagerSlidingTabStripandroid:id="@+id/tabs"android:layout_width="match_parent"android:layout_height="48dip"android:layout_gravity="bottom"android:background="@android:color/transparent" /></com.astuetz.HeaderFameLayout></com.astuetz.OuterFameLayout>

HeaderFameLayout.java

public class HeaderFameLayout extends FrameLayout{public static boolean consume = false;    public HeaderFameLayout(Context context, AttributeSet attrs)    {        super(context, attrs);    }    @Override    public boolean dispatchTouchEvent(MotionEvent ev)    {    if(OuterFameLayout.isScrolled)    {    MotionEvent event = MotionEvent.obtain(ev);    event.setAction(MotionEvent.ACTION_CANCEL);    super.dispatchTouchEvent(event);    event.recycle();    return false;    }        boolean result = super.dispatchTouchEvent(ev);        consume = result;        return result;    }    }

OuterFameLayout.java

public class OuterFameLayout extends FrameLayout{private ViewPager mViewPager;    private float startX, startY, curX, curY;    public static boolean isScrolled = false;    public void setViewPager(ViewPager viewPager)    {    mViewPager = viewPager;    }        public OuterFameLayout(Context context, AttributeSet attrs)    {        super(context, attrs);    }    private boolean _isFirstTime = false;    private MotionEvent _downEvent = null;    @Override    public boolean dispatchTouchEvent(MotionEvent ev)    {    switch (ev.getAction())        {            case MotionEvent.ACTION_DOWN:                startX = ev.getX();                startY = ev.getY();                curX = startX;                curY = startY;                _downEvent = MotionEvent.obtain(ev);                _isFirstTime = true;                isScrolled = false;                break;            case MotionEvent.ACTION_MOVE:            curX = ev.getX();                curY = ev.getY();                break;            case MotionEvent.ACTION_UP:            case MotionEvent.ACTION_CANCEL:            isScrolled = false;            break;        }        float dx = Math.abs(curX - startX);        float dy = Math.abs(curY - startY);            isScrolled = dx > 10 || dy > 10;    boolean result = super.dispatchTouchEvent(ev);        if(HeaderFameLayout.consume && isScrolled && mViewPager != null)    {    //HeaderFameLayout.dispatchTouchEvent返回true并且是滚动的前提下才给viewpager分配事件    if (_isFirstTime)            {                _isFirstTime = false;                mViewPager.dispatchTouchEvent(_downEvent);//只有分配了down事件，move事件才能生效                _downEvent.recycle();                _downEvent = null;            }    else    {    MotionEvent event = MotionEvent.obtain(ev);        mViewPager.dispatchTouchEvent(event);        event.recycle();    }    }        return result;    }}

HeaderViewPager.java

public class HeaderViewPager extends ViewPager{public HeaderViewPager(Context context, AttributeSet attrs){super(context, attrs);}@Overridepublic boolean dispatchTouchEvent(MotionEvent ev){try{return super.dispatchTouchEvent(ev);}catch (IllegalArgumentException ex){ex.printStackTrace();}return false;}}