Android Development ListView Head disappears the page navigation bar's gradient appears and hides _android

1.Fragment page XML layout:

<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 search bar--> <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= "enter merchant or commodity name" android:textcolorhint= "@color/shenhui" android:background= "@ Null "/> </LinearLayout> </LinearLayout> </RelativeLayout>

2. Main code:

Private Boolean Isflingscroll;
Private View Headview;
Private Pulltorefreshlistview Lvhomestore; Initview () {Lvhomestore = (Pulltorefreshlistview) View.findviewbyid (r.id.lv_home_store_list); LvHomeStore.setMode (
PullToRefreshBase.Mode.BOTH);
ListView ListView = Lvhomestore.getrefreshableview ();
Headview = Initheadview (); Abslistview.layoutparams layoutparams = new Abslistview.layoutparams (AbsListView.LayoutParams.MATCH_PARENT,
AbsListView.LayoutParams.WRAP_CONTENT);//This sentence should be added to Headview.setlayoutparams (Layoutparams);
Listview.addheaderview (Headview);
Lvhomestore.setadapter (adapter);
Lvhomestore.setonscrolllistener (this); @Override public void onscrollstatechanged (Abslistview view, int scrollstate) {if (scrollstate = = scroll_state_fling) {
The finger leaves the handset interface, the ListView still is sliding isflingscroll = true;
Or else if (scrollstate = = Scroll_state_touch_scroll) {//the situation where the finger scrolls on the interface isflingscroll = FALSE;}} @Override public void Onscroll (Abslistview view, int firstvisibleitem, int visibleitemcount, int totalitemcount) {showsearchbarshow ();} private void Showsearchbarshow () {int headbottomtoparenttop = Headview.getheight () + HEADVIEW.G
Ettop ();
LOG.D ("Homestore", "Headview.getheight ():" + headview.getheight ());
LOG.D ("Homestore", "Headview.gettop ():" + headview.gettop ());
LOG.D ("Homestore", "Headbottomtoparenttop:" + headbottomtoparenttop);
if (!isflingscroll) {///the position of the finger sliding in the interface int height = layoutsearch.getheight ();
LOG.D ("Homestore", "Height:" + height); if (Headbottomtoparenttop > height) {layoutsearch.setvisibility (view.invisible);} else if (Headbottomtoparenttop &
lt;= height) {//Slow sliding, this part of the code works fine, fast sliding, the data inside can not keep pace.
float alpha = (height-headbottomtoparenttop) * 1f/height;
LOG.D ("Homestore", "Alpha:" + alpha);
Layoutsearch.setalpha (Alpha);
Layoutsearch.setvisibility (view.visible);
if (!headview.isshown ()) {//solve the problem of fast sliding, the upper part of the code does not work properly.
Layoutsearch.setalpha (1);
Layoutsearch.setvisibility (view.visible); } else {//fingers left, ListView is still sliding, the general situation is the list of fast sliding, this situation directly set the navigation bar visibility if (!headview.isshown ()) {if (!)Layoutsearch.isshown ()) {layoutsearch.setvisibility (view.visible); Layoutsearch.setalpha (1);}}
else {if (Layoutsearch.isshown ()) {layoutsearch.setvisibility (view.invisible);}}} }

The above is a small set to introduce the Android development of the head of the ListView disappeared page navigation bar gradient appears and hidden, I hope to help you, if you have any questions please give me a message, small series will promptly reply to everyone. Here also thank you very much for the cloud Habitat Community website support!