android viewgroup

layout of the parent viewgroup. Measurespec and heightmeasurespec. The sub-view calls the measure function to calculate the final size of the sub-view (this process is encapsulated in the measurechildren of the viewgroup. When customizing the subclass of viewgroup, you generally need to override the onmeasure method. In this onmeasure method, you can call the me

Another new chapter has been opened. Haha, what I learned last time was to inherit the View. The personal feeling of inheriting the View is not so perfect. What I do is always want to make everything perfect, but there is no perfect world. This is the ViewGroup study. To tell the truth, I personally feel that the functions of this class are still very powerful. Here we only provide the most basic things. Well, let's continue to study it. The road is l

Respect originality: Http://blog.csdn.net/yuanzeyao/article/details/40264433 I haven't written any articles for a long time. Now I can summarize some knowledge over the weekend to help me better understand it. Today I will learn how to implement custom viewgroup.Commonly used layout, framelayout, and relativelayout layout in Android... These la s are inherited from viewgroup. With these la S, we can almost

Reprint please indicate the original address: simple and flexible to solve the problem of gesture conflict caused by viewgroup nestingThis is followed by an Android drop-down refresh pull-up loading a variety of application scenarios Super Big Broadcast (on), here is how to easily and flexibly solve the viewgroup nested gesture conflict problem. Although this is

set using code or XML files. You can use these attributes to modify them during running.ID attribute. Android requires that the ID name of each UI element be unique, but not absolute. At the same time, the same element name can be used in different Layout. Specify an ID for a UI element. You can find the ID in the code. Tags, which is different from the ID, does not need to be searched for View. It is similar to saving some descriptive data of View.

In Android, the focus acquisition and event is similar, there is a distribution mechanism, generally view tree upper node viewgroup than the underlying node's view has a higher priority to get focus, which is reflected in the ViewGroup has a property Descendantfocusability can be used to control the priority of focus acquisition. There are three values for this p

In Android development, the android UI is composed of view and viewgroup and Their Derived classes. View is the base class of all UI components, and viewgroup is the container that holds these components, which is derived from view. A viewgroup as a container can contain a

Original title: Functional operations over views in ViewGroup using KotlinOriginal link: http://antonioleiva.com/functional-operations-viewgroup-kotlin/Original Antonio Leiva (http://antonioleiva.com/about/)Published in the original: 2015-07-29Collections, iterations, arrays, sequences ... All of these share a useful set of functions that help transform, sort, and manipulate their elements . However, due to

Inherit the ViewGroup learning onMeasure () and onLayout () methods, viewgrouponmeasure When inheriting the ViewGroup class, you must override two methods: onMeasure and onLayout. 1. Call the setMeasuredDimension method void android. view. View. setMeasuredDimension (int measuredWidth, int measuredHeight) in the onMeasure method)In onMeasure (int, int), you must

Basic basic knowledge of the entry level. Previously, the relationship between views, viewgroup, widgets, and layout was unclear. After learning, I made a summary as follows: 1. View, viewgroup > View:} 1. All advanced UI components are implemented by inheriting the View class.} 2. A view occupies a rectangular area on the screen.} 3. Rendering. 4. Processing events} 5. Set whether to be visible} 6. Set whe

Basic basic knowledge of the entry level. Previously, the relationship between views, viewgroup, widgets, and layout was unclear. After learning, I made a summary as follows: 1. View, viewgroup > View: } 1. All advanced UI components are implemented by inheriting the View class.} 2. A view occupies a rectangular area on the screen.} 3. Rendering. 4. Processing events} 5. Set whether to be visible} 6. Se

false. 4. If you have the idea, the solution is to determine whether the ListView needs to consume the event before intercepting the event, that is, whether the event can continue to scroll down, that is, whether it has reached the top. The optimized SlideUpLayout is as follows: Package com. dway. testwork. viewdrag; import android. content. context; import android. support. v4.widget. viewDragHelper; impo

Link: http://blog.csdn.net/xieqibao/article/details/6570080 I.Windows, WindowManager and Window management for Android In fact, windows and views are actually displayed to users in android. The role of activity in android is mainly to solve some logic problems, such as lifecycle management and window creation. In android