android scroll lag

Android custom implement loop scroll wheel control WheelView First, submit Now the wheel layout is used in many places. For example, when choosing a birthday, the style is similar to the DatePickerDialog provided by the system, and there are many open-source controls, however, most of the interfaces are drawn based on the current project requirements, so I wrote a WheelView that suits my project. First, th

For the touchscreen, its native message simply presses, lifts, and moves these kinds of things, we just need to simply overload Ontouch or set the touch listener Setontouchlistener can be processed. However, in order to improve the user experience of our app, sometimes we need to identify the user's gestures, and Android gives us the gesture recognition tool gesturedetector can be a big help. Basis Gesturedetector works by giv

) { Switch (scrollstate) {Before scrolling, the hand also records the subscript before scrolling on the screen.Case Onscrolllistener.scroll_state_touch_scroll:View.getlastvisibleposition () Gets the index of the first item visible on the current screen in the entire ListViewLvindext=view.getlastvisibleposition ();BreakScrolling stopCase Onscrolllistener.scroll_state_idle:Record the position of the current item after a scrolling stopint scrolled=view.getlastvisibleposition ();

. Scrollview.scrollto (0,mlistviewlist.getheight ());Third, ListView internal height calculation functionwhen ListView when used with a vertical scroll bar, if only the external ScrollView , rather than using ListView scrolling. The following function is required to calculate the current height of the ListView . public static void Recallistviewheightbasedonchildren (ListView listview) {if (ListView = = null) return;ListAdapter listadapter = Listview.

Android achieves the non-scroll Effect of ListView. androidlistview The expected result is that the ListView cannot be rolled, but the biggest problem is that there must be a click event with the ListView Item. If you do not need to click the event, it is easy to set the ListView directly. setEnable (false ); If you still need to click events, the scrolling and clicking operations are all managed in the Li

Upgrade the system to 4.1, and the scroll bar in the notification bar in the lower right corner is missing. If there are few columns in it, it is acceptable, but now there are more columns, adding Bluetooth, GPS, etc., so that the title above is directly directed to the top of the interface. This is unacceptable. In the past, 4.0 had a scroll bar. I'm not sure if it was removed from 4.1, or a problem occurr

In the new Android support Library, added Coordinatorlayout, appbarlayout and so on.Effect: Scroll down recylerview,tab will be hidden, scroll up recylerview,tab recovery appears. The advantage of this is that users have more space to look at the contents of the list.Implementation steps:1) First need to use Coordinatorlayout to wrap the appbarlayout;2) The view

In development, we often need to update the list, and put the list down to the bottom, such as the publication of Weibo, chat interface and so on,Here are two approaches, the first of which is to use Scrollto ():public static void Scrolltobottom (final view scroll, final view inner) {Handler Mhandler = new Handler (); Mhandler.post (new Runnable () {public void run () {if (scroll = = NULL | | inner = = NULL

Detailed View: http://uisource.com/project/auto-scroll-view-pager/ The sample code can be seen: Https://github.com/Trinea/android-demo/blob/master/src/cn/trinea/android/demo/AutoScrollViewPagerDemo.java Use: 1. Introduction of Library 2. Call: ① Layout definition cn . Trinea.android.view.autoscrollviewpager.AutoScrollViewPager android:id= "@+id/view_pager"

In the layout, the textview text is too long and you want to add a scroll bar for it so that the text can be displayed in a scroll manner. The method retrieved through the network is actually very simple. It is to add the Android: scrollbars attribute to the textview in the layout file. The parameter can be either horizontal or vertical scrolling.

In development, we often need to update the list, and put the list down to the bottom, such as the publication of Weibo, chat interface and so on,Here are two approaches, the first of which is to use Scrollto (): Public Static voidScrolltobottom (FinalView Scroll,FinalView Inner) { //how to ask Hovertree.comHandler Mhandler =NewHandler (); Mhandler.post (NewRunnable () { Public voidrun () {if(Scroll = =N

Listviewandroidexceptionlayoutscrolobject The default slider and custom slider image are as follows: It is easy to set the quick rolling attribute. You only need to set the attribute in the XML file of the layout: Android: layout_width = "fill_parent"Android: layout_height = "fill_parent" Android: fastscrollenabled = "true"