The items come from the ExpandableListAdapter associated with this view. This differs from the ListView by allowing two levels: groups which can individually be expanded to show its children. Layout item_parent_list.xml for parent itemĪttribute encapsulation class Chapter.java for parent item package . Expandable listview that shows items in a vertically scrolling two-level list. Place an Expandable ListView and a Button
Expandable listview android studio code#
The following code is pasted directly: 1. Therefore, we usually use bean classes to store some specific attributes or behaviors instead of values, so that we can call the attributes in bean classes many times and assign them to use, so as to realize the function of reuse.
JavaBean is a reusable component written in JAVA language. Then I will provide a get/set method to get and set attributes. In general programs, we call it data layer, which is used to set the attributes and some behaviors of data. JavaBean is a model in MVC design model, also known as model layer. In fact, biz acts as a server service, communicating directly between the upper and lower levels, avoiding business processing at the model level (the code is too messy to maintain).ĭao layer: dao layer is called Data Access Layer All called data access object, it belongs to a kind of comparative bottom layer, which is generally used for the operation of database comparison foundation, specifically for the addition or deletion of a table or an entity. It can effectively avoid requests directly invoking database content, ignoring the part of logical processing. Interpretation: The main role of the control layer is to coordinate the direct invocation and transformation between the model layer and the view layer.
Expandable listview android studio how to#
Understand a few concepts first Biz:(Business Logic Layer) estoy creando una aplicación en la que cree un expandable listview, quiera saber como puedo desde las listas que se expandieron pasar a otra activity, y una de ellas volverla a expandir. And I want to make an expandable list view which is the senddate table values is the head of the expandable list view and the order table values in the body values of the expandable listview, but the problem is, I dont know how to compare the two senddate values. Implementation of Expandable ListView of SQLite and json Data Based on Network Realization of complex cases under Case 2: The last article described the basic use of Expandable ListView
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