Android开发之ListView的head消失页面导航栏的渐变出现和隐藏
1.Fragment页面xml布局:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" xmlns:ptr="http://schemas.android.com/apk/res-auto" tools:context=".fragment.home.HomeStoreFragment" > <com.handmark.pulltorefresh.library.PullToRefreshListView android:id="@+id/lv_home_store_list" android:layout_width="match_parent" android:layout_height="match_parent" ptr:ptrDrawable="@drawable/default_ptr_flip" ptr:ptrAnimationStyle="flip" /> <!--top搜索栏--> <LinearLayout android:id="@+id/ll_top_search" android:layout_width="match_parent" android:layout_height="60dp" android:background="@color/zuti" android:visibility="invisible" > <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:layout_marginLeft="15dp" android:layout_marginRight="15dp" android:layout_marginTop="8dp" android:layout_marginBottom="8dp" android:background="@drawable/shape_edit_cornor" android:gravity="center" > <ImageView android:id="@+id/iv_search_icon" android:layout_width="30dp" android:layout_height="30dp" android:src="@drawable/icon_navbar_search" android:layout_marginRight="5dp" /> <EditText android:id="@+id/et_store_search" android:layout_width="wrap_content" android:layout_height="wrap_content" android:hint="输入商家或商品名" android:textColorHint="@color/shenhui" android:background="@null" /> </LinearLayout> </LinearLayout> </RelativeLayout>
2.主要代码:
privatebooleanisFlingScroll; privateViewheadView; privatePullToRefreshListViewlvHomeStore; initView(){ lvHomeStore=(PullToRefreshListView)view.findViewById(R.id.lv_home_store_list); lvHomeStore.setMode(PullToRefreshBase.Mode.BOTH); ListViewlistView=lvHomeStore.getRefreshableView(); headView=initHeadView(); AbsListView.LayoutParamslayoutParams=newAbsListView.LayoutParams(AbsListView.LayoutParams.MATCH_PARENT,AbsListView.LayoutParams.WRAP_CONTENT);//这句要加上去 headView.setLayoutParams(layoutParams); listView.addHeaderView(headView); lvHomeStore.setAdapter(adapter); lvHomeStore.setOnScrollListener(this); } @Override publicvoidonScrollStateChanged(AbsListViewview,intscrollState){ if(scrollState==SCROLL_STATE_FLING){//手指离开手机界面,Listview还在滑动 isFlingScroll=true; }elseif(scrollState==SCROLL_STATE_TOUCH_SCROLL){//手指在界面上滚动的情况 isFlingScroll=false; } } @Override publicvoidonScroll(AbsListViewview,intfirstVisibleItem,intvisibleItemCount,inttotalItemCount){ showSearchBarShow(); } privatevoidshowSearchBarShow(){ intheadBottomToParentTop=headView.getHeight()+headView.getTop(); Log.d("homeStore","headView.getHeight():"+headView.getHeight()); Log.d("homeStore","headView.getTop():"+headView.getTop()); Log.d("homeStore","headBottomToParentTop:"+headBottomToParentTop); if(!isFlingScroll){//手指在界面滑动的情况 intheight=layoutSearch.getHeight(); Log.d("homeStore","height:"+height); if(headBottomToParentTop>height){ layoutSearch.setVisibility(View.INVISIBLE); }elseif(headBottomToParentTop<=height){//缓慢滑动,这部分代码工作正常,快速滑动,里面的数据就跟不上节奏了。 floatalpha=(height-headBottomToParentTop)*1f/height; Log.d("homeStore","alpha:"+alpha); layoutSearch.setAlpha(alpha); layoutSearch.setVisibility(View.VISIBLE); } if(!headView.isShown()){//解决快速滑动,上部分代码不能正常工作的问题。 layoutSearch.setAlpha(1); layoutSearch.setVisibility(View.VISIBLE); } }else{//手指离开,listview还在滑动,一般情况是列表快速滑动,这种情况直接设置导航栏的可见性 if(!headView.isShown()){ if(!layoutSearch.isShown()){ layoutSearch.setVisibility(View.VISIBLE); layoutSearch.setAlpha(1); } }else{ if(layoutSearch.isShown()){ layoutSearch.setVisibility(View.INVISIBLE); } } } }
以上所述是小编给大家介绍的Android开发之ListView的head消失页面导航栏的渐变出现和隐藏,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对毛票票网站的支持!