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[Android development experience] What is the modification of ViewHolder? Static? Final? Static final ?, Androidviewholder Reprinted please indicate the source: http://blog.csdn.net/zhaokaiqiang1992 Now we all know that ViewHolder is used to optimize the listview. But what does ViewHolder use to modify it? What is the s
ensure that the object is basically stable in a value.Performance boost: Here we find that using Sparsearray this set instead of HASHMAP, we know that Sparsearray is a tool class for Android and is officially recommended to replace the HashMap class, Its internal use of the two-point search to improve the efficiency of the search, and not a little bit two oh, who use who know, the specific content want to understand, can degree Niang brother or left
In Android development, for the Adapterview type of control, we need to set the data through the adapter, if the display is relatively simple, we usually use Simpleadapter or arrayadapter, and for complex and changeable data, We generally deal with customizing a adapter that inherits from Baseadapter. For Itemview reuse, we usually use a viewholder to wrap the controls inside the Itemview.In my
Android Application series: ViewHolder tool class implementation worth collecting Preface In the process of APP development, the siege lion has to look at the components ListView and GridView, and send a few waves of autumn waves. Naturally, the original ecological beauty BaseAdapter is a programmer's favorite. With it, we can do what we want. Hey, you know, haha ~ However, every time we write a BaseAdapte
: ease of use? Memory leaks? Performance improvement? Robustness? And so on ...Ease of Use: the greatest feature of the tool class is ease of use, this viewholder is a typical use of the doctrine, we do not have to worry about writing some of the appropriate code, directly into the view and ID, cohesion loose coupling. and using the Generic template method, automatically with the external View sub-class adaptation, do not need us to manually force th
Android Development notes -- ViewHolder and listviewviewholder for ListView loading Performance Optimization Not long ago, when I was working on an android project, one of the functions was to crawl news from a website and use ListView to display the news. Although the pages were paginated, I still felt that it could not achieve the ideal smooth effect. I checked
From blog: http://www.cnblogs.com/tiantianbyconan/p/3642849.htmlIn Android projects, the ListView control is often used, while the corresponding adapter GetView () method is written in a standard form, as follows: 1 @Override 2 public View getView (int position, view Convertview, ViewGroup parent) {3 Viewholder holder; 4 if (null = = Convertview) {5 holder = new Viewhol
, parent, false); } ImageView Bananaview = Viewholder.get (Convertview, R.id.banana); TextView Phoneview = Viewholder.get (Convertview, r.id.phone); Bananaphone Bananaphone = GetItem (position); Phoneview.settext (Bananaphone.getphone ()); Bananaview.setimageresource (Bananaphone.getbanana ()); return Convertview;}The second type:Import Android.util.sparsearray;import android.view.view;/** * Viewholder Elegant notation * from: ht
); TextView Phoneview = Viewholder.get (Convertview, r.id.phone); Bananaphone Bananaphone = GetItem (position); Phoneview.settext (Bananaphone.getphone ()); Bananaview.setimageresource (Bananaphone.getbanana ()); return Convertview;}Another type of:Import Android.util.sparsearray;import android.view.view;/** * Viewholder Elegant notation * from: http://stackvoid.com/ using-adapter-in-efficiency-way/* * @author Liujinpeng * */public clas
Detailed explanation of ViewHolder mode development in Android Detailed explanation of ViewHolder mode development in Android development:1. Explanation of ViewHolder:(1 ).It is just a static class, not an Android API method.(2 ).
For increasing the load efficiency of the ListView child Item view that is frequently used in Android, based on two points basic considerations:The creation of the 1,android view is more resource consuming;2,findviewbyid () is not the quickest.So the GetView () method in the adapter that is often used in real-world development:Public View GetView (int position, view Convertview, viewgroup parent);If each ti
Viewholder is not the development API of Android, but a design method, is to design a static class, cache, save the ListView update, but also to re-operation.Public View getView (int pos, View Convertview, ViewGroup parent) {Viewholder Holder;if (Convertview = = null) {Convertview = minflater.inflate (R.layout.list_item, NULL);Holder.text = (TextView) Convertview
Listview (ViewHolder reuse mechanism) for Android Performance Optimization) I believe that most people will use the ListView control in many cases, because it is actually a lot of use, but sometimes it gets stuck when there is a lot of data, and when the ListView goes down, this requires us to optimize it. ListView optimization mainly includes the following aspects: 1. convertView Reuse 2. subview reuse of
) { - returnNewsinfos.Get(position); - } - - /** in * Returns the location of item, counting starting from 0 - * to * @param position + * @return - */ the @Override * Public LongGetitemid (intposition) { $ returnposition;Panax Notoginseng } - the /** + * Define a Viewholder object A */ the Viewholder Holder; + -
Viewholder usually appears in the adapter so that the ListView can quickly set values when scrolling, rather than having to recreate many objects each time to improve performance.In Android development, the ListView is a very important component, it is in the form of a list of data based on the long adaptive presentation of the content, the user can freely define the layout of each column of the ListView, b
First of all, praise the great God of HymanPreviously it was simply rewriting a baseadapter to keep the GetView method abstract. and Viewholder not abstract ...Viewholder (with a collection + generic management access view)/** * author:stone * Email: [emailprotected] * time:15/7/24 */public class Stoneviewholder {privat e int mposition; Private View Mconvertview; Private sparsearrayAdapter/** * autho
Our usual way of using adapterpublic class Busbasesearchapadter extends Simplebaseapadter {private listCan see that the practical code only have GetView and Viewholder but other code and have to write, too painful to have to repeatedly write countless adapter and Viewhoder.We can write a generic viewholder.public class Viewholder {private final sparsearrayUse aSparsearray Save the view.Now adapter writes li
checkbox. ImageView's pictures appear repeatedly) can become chaotic.General treatment. There needs to be a mechanism to manage a corresponding relationship: What is the state of the current positionLet's say the checkbox checks for state confusion:Class Myadapter extends StonelistadapterAbout SparsearraySparsearray internal implementations are array arrays. When the length is insufficient, the system.arraycopy is calledThere are two arrays of keys and values inside.Put (key, value); Binary fi
Public classViewholder {//I added a generic return type to reduce the casting noise in client code@SuppressWarnings ("Unchecked") Public StaticextendsView> T Get (view view,intID) {Sparsearray) View.gettag (); if(Viewholder = =NULL) {Viewholder=NewSparsearray(); View.settag (Viewholder); } View Childview=viewholder.get (ID); if(Childview = =NULL) {Childview=View
Simple ViewHolder and viewholder This method is written by a foreign company. Provides a static method: public class ViewHolder { @SuppressWarnings("unchecked") public static Use the following in getView: public View getView(int position, View convertView, ViewGroup parent) { if (convertView == null) { convertView = LayoutInflater.from(context) .infl
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