神奇的listView实现自动显示隐藏布局Android代码

View header=new View(this);
 header.setLayoutParams(new AbsListView.LayoutParams(
  AbsListView.LayoutParams.MATCH_PARENT,
  (int)getResources().getDimension(R.dimen.abc_action_bar_default_height_material)));
 mListView.addHeaderView(header);

bbsListView.setOnTouchListener(new OnTouchListener() {
   
   @Override
   public boolean onTouch(View v, MotionEvent event) {
     switch (event.getAction()) 
    {
    case MotionEvent.ACTION_DOWN:
     mFirstY=event.getY();
     break;
    case MotionEvent.ACTION_MOVE:
     mCurrentY=event.getY();
     if(mCurrentY-mFirstY>mTouchSlop)
      direction=0; //listView向下滑动
     else if(mFirstY-mCurrentY>mTouchSlop)
      direction=1; //listView向上滑动
     if(direction==1)
     {
      if(mShow)
      {
       toolbarAnim(1); //隐藏上方的view
       mShow=!mShow;
      }
     }
     else if(direction==0)
     {
      if(!mShow)
      {
       toolbarAnim(0); //展示上方的view
       mShow=!mShow;
      }
     }
    case MotionEvent.ACTION_UP:
     break;
    }
    return false;
   }
  });
 }

protected void toolbarAnim(int flag) 
 {
  
  
  if(set!=null && set.isRunning())
  {
   set.cancel();
  }
  if(flag==0)
  {
  

   mAnimator1=ObjectAnimator.ofFloat(mToolbar, 
     "translationY", linearView.getTranslationY(),0);
   mAnimator2=ObjectAnimator.ofFloat(mToolbar, "alpha", 0f,1f);
  }
  else if(flag==1)
  {
   
  
   mAnimator1=ObjectAnimator.ofFloat(mToolbar, 
     "translationY", linearView.getTranslationY(),-linearView.getHeight());
   mAnimator2=ObjectAnimator.ofFloat(mToolbar, "alpha", 1f,0f);
   
  }
  set=new AnimatorSet();
  set.playTogether(mAnimator1,mAnimator2);
  set.start();
  
}

dependencies{
   compile fileTree(include:['*.jar'],dir:'libs')
   compile 'com.android.support:appcompat-v7:21.0.3'
 } 

final View header=new View(this); //给listView增加一个headView，避免第一个item被遮挡 header.post(new Runnable() {
 public void run() {
     header.setLayoutParams(new AbsListView.LayoutParams(            AbsListView.LayoutParams.MATCH_PARENT, myView.getHeight()));
   }
  });