android recyclerview adapter

Booleanareallitemsenabled () {Throw NewRuntimeException ("stub!"); } Public BooleanIsEnabled (intposition) { Throw NewRuntimeException ("stub!"); } PublicView Getdropdownview (intposition, View Convertview, ViewGroup parent) { Throw NewRuntimeException ("stub!"); } Public intGetitemviewtype (intposition) { Throw NewRuntimeException ("stub!"); } Public intGetviewtypecount () {Throw NewRuntimeException ("stub!"); } Public BooleanIsEmpty () {Throw NewRuntim

, the actual effect on the phone also has a discrepancy.For example, Meizu MX3 resolution is 1080*1800, the standard case density is 480, but his density is about 524 , and 480 Close, that is, it will look for files under this drawable-xxhdpi resource. In other words, you cut the image in 480*800 resolution and then press twice magnification icon on this phone to show the effect is still smaller than the actual. The other problem is 540*960 or 640*960, whose density is likely to be either near o

Android adapters Simpleadapter and baseadapter When designing a network program or data processing display program, you often usesimpleadapter and baseadapter to achieve. adapter is the adapter mode, which is the bridge between the data and the interface. baseadapter is an abstract class that must be used to define subclasses and implement related methods. simple

android-Optimizing UI Performance (2)-Improving the efficiency of adapteran increase in the efficiency of adapterAdapter is the bridge between the data and the ListView, and whenever you need to display the item, the GetView () will be called.If we have a large amount of data and adapter is inefficient (each time we call inflate to create a new view,inflate (an IO operation), the interface will beFor exampl

Android Multi-screen adapter for DP and PX relationshipsPeople have always asked me, Android multi-screen adaptation in the end is how to do, I do not know how to explain clearly, perhaps I am also quite confused.The following conclusions are mainly based on the analysis of the official documents Https://developer.android.com/guide/practices/screens_support.htmlA

the data is dynamic Note: Another question: at first, I New arrayadapter Here, the constructor is passed in an array, so we can find a problem: When I click the button, the array data is added, but the data in the list is not changed, Why is this? Is it a set of input and The set in arrayadapter is not the same reference. The ADD and insert methods are available in the arrayadapter. Java. Lang. unsupportedoperationexception: Android hasn'

Android:shadowradius= "2" One Android:id= "@+id/textview" />1 XML version= "1.0" encoding= "Utf-8"?>2 Relativelayoutxmlns:android= "Http://schemas.android.com/apk/res/android"3 Xmlns:tools= "Http://schemas.android.com/tools"4 Android:layout_width= "Match_parent"5 Android:layout_height= "Match_parent"6 Android:paddingbottom= "@dimen/activity_vertical_margin"7 Android:paddingleft= "@dimen/activity_horizontal_margin"8 Android:paddingright= "@dimen/activ

This article is mainly for you to talk about adapter ListView optimization and send Weibo, we all know that Android in some of the more memory-intensive classes, in order to avoid wasting insideWe need to optimize our components and so on, so that they save unnecessary waste of resourcesCustom adapters:Package com.neweriweibo.adapter;/** * Adapter * @author engin

More commonly used are Base adapter,impleader,adapter,counteradaptation and so on. Baseadapter is an abstract class, inheriting it needs to implement more methods, so it also has a high degree of flexibility; Arrayadapter supports generic operations, the simplest of which is to display only one line of words. Simpleadapter has the best extensibility and can customize various effects. Simplecu

1, in learning to use the ListView when the adapter adapter, the definition of myadapter need to inherit the ListAdapter interface, the interface many methods are not implemented, in order to facilitate the Google engineers to achieve a Baseadapter class, We can inherit this abstract class when we use it, so we just need to complete a few abstract methods.public class Db_adapter extends Baseadapter {private

The Adapter in Android is very useful for customizing the display list, such as SimpleAdapter. Its constructor is: Public SimpleAdapter (Context context, List> data, int resource, String [] from, int []) The meanings of its parameters: 1. context, context, SimpleAdapter associated view, which is generally the current Activity, this 2. data: generic List, such as ArrayList, Map, or HashMap 3. resource,

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

ImportAndroid.content.Context;ImportAndroid.widget.BaseAdapter;Importjava.util.List;/*** Base class Adapter * Created by Administrator on 2015/10/22 0022.*/ Public Abstract classMybaseadapterextendsBaseadapter {protectedContext Mcontext; PublicListdatas; PublicMybaseadapter (baseactivity context,listlist) { Super(); Mcontext=context; Datas=list; } PublicMybaseadapter (baseactivity context) {Super(); Mcontext=context; } @Override Public in

Solution SolutionsWritten values-port-hdpi-1824x1200Problems found in recent projectsI write resolution VALUES-1920X1200, but flatbed Huawei X1 not go this resolution, write 1800x1000 will go in, but still wrong ah, this will affect the adaptation of other devicesLater found that you have to remove the virtual key portion of the resolution of my printing screen is//------1824 Huawei Glory X1 7.0Finally, I put the adaptation of value inside the values-port-hdpi-1824x1200, which can be adapted. In

/. Android-how-to-adjust-layout-in-full-screen-mode-when-softkeyboard-is-visibleThe solution with the highest scoreIt can be solved perfectly on Samsung, but the bottom menu bar and keyboard on the 5.0 system and Meizu phone have a height of about 50px, not perfect fit ... NimaContinue Google to find this http://stackoverflow.com/questions/21092888/ Windowsoftinputmode-adjustresize-not-working-with-translucent-action-navbar customizes a layout to inhe

navBarOverride = (String) m.invoke(systemPropertiesClass, "qemu.hw.mainkeys"); if ("1".equals(navBarOverride)) { hasNavigationBar = false; } else if ("0".equals(navBarOverride)) { hasNavigationBar = true; } } catch (Exception e) { } return hasNavigationBar;}}Invocation method: Called after the Setcontentview () method in the extracted activity base class //适配华为部分机型虚拟键 if (NavigationBarUtil.getInstance().hasNavigationBar(this)) { N