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效果圖：

最近要在公司的項目中實現(xiàn)這種效果，就自己動手實現(xiàn)了一下。

使用

GraphicDetailsLayout gdLayout = (GraphicDetailsLayout) findViewById(R.id.gdlayout);gdLayout.addFragment(new Fragment[] {new SpFragment(), new DeFragment()}, getSupportFragmentManager());

還是很簡單的，把上下兩個fragment添加到GraphicDetailsLayout 中就可以了

思路

從效果中可以看到上下兩個控件都是可以滾動的，初始化狀態(tài)下，下面的控件是隱藏在屏幕下面的；那我們設計最外面的布局是LinearLayout，然后LinearLayout里面放兩個ScrollView，ScrollView滾動到頂部或頂部的時候，告訴LinearLayout攔截事件，來實現(xiàn)兩個ScrollView的上下拖動效果。

實現(xiàn)

首先自定義一個ScrollView

public class GDScrollView extends ScrollView {    
   private LinearLayout mLl;       private int mLlHeight;       public static final String TAG_ONE = "up";       public static final String TAG_TWO = "down";       public static final int ID_ONE = 11111;       public static final int ID_TWO = 22222;       private GraphicDetailsLayout.ScrollListener mScrollListener;   
   public GDScrollView(Context context) {               super(context);    }    
   public GDScrollView(Context context, AttributeSet attrs) {          super(context, attrs);       }    
   public GDScrollView(Context context, AttributeSet attrs, int defStyleAttr) {               super(context, attrs, defStyleAttr);       }    
   @TargetApi(Build.VERSION_CODES.LOLLIPOP)       public GDScrollView(Context context, AttributeSet attrs, int defStyleAttr,     int defStyleRes) {               super(context, attrs, defStyleAttr, defStyleRes);       }    
   public void setScrollListener(GraphicDetailsLayout.ScrollListener scrollListener) {                mScrollListener = scrollListener;       }    
   public void addFragment(Fragment fragment, FragmentManager fragmentManager) {                FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();                if(mLl == null) mLl = (LinearLayout) getChildAt(0);                fragmentTransaction.replace(mLl.getId(), fragment);          fragmentTransaction.commit();    }    
   @Override       protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {                super.onMeasure(widthMeasureSpec, heightMeasureSpec);          mLlHeight = mLl.getMeasuredHeight();       }    
   @Override       protected void onFinishInflate() {                super.onFinishInflate();                mLl = (LinearLayout) getChildAt(0);       }    
   @Override       protected void onOverScrolled(int scrollX, int scrollY, boolean clampedX, boolean clampedY) {                super.onOverScrolled(scrollX, scrollY, clampedX, clampedY);           if(getTag().equals(TAG_ONE)) {                      //上面的界面滾動到底部的時候                       if(isScrollBottom()) {                               criticalPointOperation(false, true, TAG_ONE);                      }                 }       
        if(getTag().equals(TAG_TWO)) {              //下面的界面滾動到頂部的時候                  if(getScrollY() <= 0) {                              criticalPointOperation(false, true, TAG_TWO);                      }                 }        }    
   private void criticalPointOperation(boolean allow, boolean intercept, String tag) {             getParent().requestDisallowInterceptTouchEvent(allow);         if(mScrollListener != null) mScrollListener.scrollBottom(intercept, tag);    }    
   public boolean isScrollBottom() {               return getScrollY() >= (mLlHeight - getMeasuredHeight());       }}

重寫onOverScrolled方法監(jiān)控滾動的狀態(tài)，判斷不同的ScrollView滾動到頂部或者頂部觸發(fā)回調(diào)事件，把觸摸事件交給上層LinarLayout控件，來看看LinearLayout的onTouchEvent方法

@Overridepublic boolean onTouchEvent(MotionEvent event) {       switch (event.getAction()) {             case MotionEvent.ACTION_MOVE:                   if(mInitY == 0) {                          mInitY = event.getY();                   } else {                          int offset = (int) Math.abs(event.getY() - mInitY);                       if(offset > mTouchSlop) {                                int delayOffset = offset * 7 / 10;                if(mCurrentTag.equals(GDScrollView.TAG_ONE)) {                     mUpSVMarginTop = mInitMarginTop - delayOffset;                    } else {                                          mUpSVMarginTop = - halfHeight + delayOffset;                    }                              if(mUpSVMarginTop > 0) mUpSVMarginTop = 0;                  requestLayout();                         }                  }                  break;            case MotionEvent.ACTION_UP:                   mIntercept = false;                   mInitY = 0;          if(mCurrentTag.equals(GDScrollView.TAG_ONE)) {                     if(Math.abs(mUpSVMarginTop) > halfHeight / 3) {                 startAnimation(mUpSVMarginTop, halfHeight - Math.abs(mUpSVMarginTop), false);                           } else {                                  startAnimation(mUpSVMarginTop, Math.abs(mUpSVMarginTop), true);                           }                    } else {                           if(Math.abs(mUpSVMarginTop) < halfHeight * 2 / 3) {                        startAnimation(mUpSVMarginTop, Math.abs(mUpSVMarginTop), true);                            } else {                                    startAnimation(mUpSVMarginTop, halfHeight - Math.abs(mUpSVMarginTop), false);                            }                    }                     requestLayout();                     break;          }          return true;  }

LinearLayout攔截到事件以后重寫onTouchEvent方法，通過手勢拖動來不斷的計算ScrooView距離頂部的高度mUpSVMarginTop，調(diào)用requestLayout方法發(fā)起重新布局，重寫onLayout方法

@Overrideprotected void onLayout(boolean changed, int l, int t, int r, int b) {        super.onLayout(changed, l, t, r, b);        halfHeight = getMeasuredHeight() / 2;        mUpScrollView.layout(0, mUpSVMarginTop, getMeasuredWidth(), mUpSVMarginTop + halfHeight);        mBottomScrollView.layout(0, mUpSVMarginTop + halfHeight , getMeasuredWidth(), mUpSVMarginTop + getMeasuredHeight());}

大致的思路和實現(xiàn)已經(jīng)講解完成了，想看具體實現(xiàn)代碼

源碼地址：

https://github.com/chenpengfei88/GraphicDetailsLayout

到這里接結(jié)束啦。

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使用

思路

實現(xiàn)