GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. This is boiler plate cockapoo coat change to implement 3-level exapandable list view in Android.
This code will work with dynamic data, an extension of its gist which works only on static string text values. Define a secondLevel ArrayList, this will be used as key data to fetch arrays accross levels.
Define LinkedHasMap for each subcategory where key is subcategory name, and value is a string array. Anyone is allowed to fork and create a pull request provided that the code is improved in anyway.
See also the list of contributors who participated in this project. Licensed under the Apache License, Version 2. You may obtain a copy of the License at. See the License for the specific language governing permissions and limitations under the License.
Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up. Java Branch: master. Find file. Sign in Sign up. Go back. Launching Xcode If nothing happens, download Xcode and try again. Latest commit Fetching latest commit….
Code is not using ViewHolder pattern hence it is not recycled. Code is not memory efficient.
Getting Started Download or clone project Define parent array for main category, parent is top level list. You will need to possibly edit code if you change min sdks etc.
Contributing Anyone is allowed to fork and create a pull request provided that the code is improved in anyway. Authors Talha Hasan Zia - Created sample working project with dynamic data. Based on gist code provided by Stephane Schittly See also the list of contributors who participated in this project.
You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window.It is different from simple ListView because here in this feature it shows the two levels of a list, which is easily expanded and collapsed. ExpandableListView is a form of group and the child items. When I click on any group it is expanded and show the child items again click on the group it will collapse, we can also do different actions on child items to make it custom.
It uses the same feature of simple ListView i. Methods : getGroupView : This method is used to show the view of a group.
ExpandableListData : It shows your list data and by using HashMap we can map the child item data with their respective groups. ExpandableListAdapter : It gives us the Main activity with the data i.
To create the ExpandableListView we have to implement some interfaces also i. In this example, we will learn how to implement ExpandableListView in Android. STEPS: 1. And name it ExpandableListViewAndroid. XML Layout files:. It contains ExpandableListView. It contains a TextView to display the title of group header. It also contains a TextView to display the content of child items. Initialize ExpandableListView. Conclusion: This is the simple example of ExpandableListView.
It is just used to show the list in a different format, we can perform many operations on a child item and we can customize it also according to the need of a application. This is the basic idea about the android widgets, which is very popular in Android development.Android Studio Tutorial - Recycler View Dynamic Load Data edmt dev
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In this article we are creating an application in which user inputs items to a ListView via an EditText widget. Add Items Dynamically to ListView I am George Mathew, working as software architect and Android app developer at wptrafficanalyzer. For hiring me, please mail your requirements to info wptrafficanalyzer.
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My other blogs store4js. Ready to test your knowledge in Android? Take this quiz :. Hi, I am new to this dynamic list view, I want to do long press action in this dynamic list view, How can i achieve this?. Thanks in advace. Is it possible if i add an item here and be able to save it even if i restart the app?
The type new DialogInterface.Are you ready for the Galaxy S20? Here is everything we know so far! Deleted User Guest. Then iterate over the cursor, extracting all the required fields. If you don't understand the above, then you need to look at an Android database tutorial. It's too much to go through in a forum thread.
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Your name or email address: Do you already have an account?The display of elements in a list is a very common pattern in mobile applications. The user sees a list of items and can scroll through them. Such an activity is depicted in the following picture. Typically the user interacts with the list via the toolbar, for example, via a button which refreshes the list. Individual list items can be selected. This selection can update the toolbar or can trigger a detailed screen for the selection.
The following graphic sketches that. On the selection of a list item another activity is started. Android provides the ListView and the ExpandableListView classes which are capable of displaying a scrollable list of items. The ExpandableListView class supports a grouping of items. The input of a list items in the list can be arbitrary Java objects. The adapter extracts the correct data from the data object and assigns this data to the views in the row of the ListView.
These items are typically called the data model of the list. An adapter can receive data as input. An adapter manages the data model and adapts it to the individual entries in the widget. An adapter extends the BaseAdapter class. Every line in the widget displaying the data consists of a layout which can be as complex as you want.
A typical line in a list has an image on the left side and two text lines in the middle as depicted in the following graphic. The adapter would inflate the layout for each row in its getView method and assign the data to the individual views in the row.
The filtering and sorting of the data is handled by the adapter. You need to implement the logic in your custom adapter implementation. The notifyDataSetChanged method on the adapter is called if the data has changed or if new data is available. The notifyDataSetInvalidated method is called if the data is not available anymore. Android provides default adapter implementations; the most important are ArrayAdapter and CursorAdapter. ArrayAdapter can handle data based on Arrays or java.
SimpleCursorAdapter can handle database related data. The ArrayAdapter class can handle a list or arrays of Java objects as input. Every Java object is mapped to one row. By default, it maps the toString method of the object to a view in the row layout. You can define the ID of the view in the constructor of the ArrayAdapter otherwise the android. The ArrayAdapter class allows to remove all elements in its underlying data structure with the clear method call.
You can then add new elements via the add method or a Collection via the addAll method.I created a non-animated expandable listview repo, also mentioned you as co-author. It works with dynamic data, as an extension to your simple gist.
You can contribute this animation extension there if you want to. Skip to content. Instantly share code, notes, and snippets. Code Revisions 7 Stars 1. Embed What would you like to do?
Embed Embed this gist in your website. Share Copy sharable link for this gist. Learn more about clone URLs. Download ZIP. Animated 3 levels expandable listview only level 1 and 2 are animated, see code for comments. SuppressLint ; import android. Context ; import android. Canvas ; import android. Drawable ; import android. Build ; import android. AttributeSet ; import android. SparseArray ; import android. View ; import android.
ViewGroup ; import android. Animation ; import android. Transformation ; import android. BaseExpandableListAdapter ; import android. ExpandableListAdapter ; import android. ExpandableListView ; import java. ArrayList ; import java. The ExpandableListView tells the adapter to animate a certain group. The ExpandableListView calls expandGroup. ExpandGroup calls notifyDataSetChanged.
As an result, getChildView is called for expanding group. Since the adapter is in "animating mode", it will return a dummy view. This dummy view draws the actual children of the expanding group.
This dummy view's height is animated from 0 to it's expanded height. This forces the ExpandableListView to refresh all of it's views again.
This dummy view's height is animated from it's current height to 0.If your app needs to display a scrolling list of elements based on large data sets or data that frequently changesyou should use RecyclerView as described on this page.
Then simply add the fragment to your activity layout. Figure 1. A list using RecyclerView.
Figure 2. A list also using CardView. If you'd like to create a list with cards, as shown in figure 2, also use the CardView widget as described in Create a Card-based Layout. The RecyclerView widget is a more advanced and flexible version of ListView. In the RecyclerView model, several different components work together to display your data. The overall container for your user interface is a RecyclerView object that you add to your layout.
The RecyclerView fills itself with views provided by a layout manager that you provide. You can use one of our standard layout managers such as LinearLayoutManager or GridLayoutManageror implement your own. The views in the list are represented by view holder objects. These objects are instances of a class you define by extending RecyclerView. Each view holder is in charge of displaying a single item with a view. For example, if your list shows music collection, each view holder might represent a single album.
The RecyclerView creates only as many view holders as are needed to display the on-screen portion of the dynamic content, plus a few extra. As the user scrolls through the list, the RecyclerView takes the off-screen views and rebinds them to the data which is scrolling onto the screen.
The view holder objects are managed by an adapterwhich you create by extending RecyclerView. The adapter creates view holders as needed. The adapter also binds the view holders to their data. It does this by assigning the view holder to a position, and calling the adapter's onBindViewHolder method. That method uses the view holder's position to determine what the contents should be, based on its list position. This RecyclerView model does a lot of optimization work so you don't have to:.
To access the RecyclerView widget, you need to add the v7 Support Libraries to your project as follows:. Now you can add the RecyclerView to your layout file. For example, the following layout uses RecyclerView as the only view for the whole layout:. Once you have added a RecyclerView widget to your layout, obtain a handle to the object, connect it to a layout manager, and attach an adapter for the data to be displayed:. Note: With Android Studio 3.
Consider using view binding instead of findViewById.
To feed all your data to the list, you must extend the RecyclerView. Adapter class. This object creates views for items, and replaces the content of some of the views with new data items when the original item is no longer visible.