Questions and answers

How to update data in spinner?

How to update data in spinner?

3 Answers. Use adapter. add() to add data and then call adapter. notifyDataSetChanged() to apply changes.

How do you refresh a spinner adapter?

If the Spinner has already the adapter, you don’t have to re-assign it. More over, the only think you have to do is update the adapter and call notifyDataSetChanged method. Using add/remove on your adapter and using notifyDataSetChanged() enables you not having to create new adapters over and over again.

How to refresh spinner value in android?

getAdapter(); adapter. notifyDataSetChanged(); The notifyDataSetChanged() will force refresh the spinner so that the list change can be applied to the view.

How do you clear a spinner?

3 Answers. You have called spinner2List. clear(); but haven’t notified the adapter by using notifyDataSetChanged(); method. when you select one of your first spinner Items you can use code below in first spinner onItemSelected() method to clear your second spinner.

How do you fill a spinner?

Here is an example to fully programmatically:

  1. init a Spinner.
  2. fill it with data via a String List.
  3. resize the Spinner and add it to my View.
  4. format the Spinner font (font size, colour, padding).
  5. clear the Spinner.
  6. add new values to the Spinner.
  7. redraw the Spinner.

How do you use the spinner in Kotlin?

Android Spinner is a view similar to dropdown list which is used to select one option from the list of options. It provides an easy way to select one item from the list of items and it shows a dropdown list of all values when we click on it.

How can we convert data from database to spinner in Android?

  1. Read the Spinner class documentation.
  2. Query your Database.
  3. Fetch the results.
  4. Encode the data into JSON format.
  5. Request and parse results in your app.
  6. Populate a list array for the spinner.
  7. Set the adapter on your spinner.

How do I get a spinner value?

This example demonstrates how do I get spinner value in android. Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project. Step 2 − Add the following code to res/layout/activity_main. xml.

In which directory XML layout files are stored?

Specifically, Android considers XML-based layouts to be resources, and as such, layout files are stored in the reslayout directory inside your Android project. Each XML file contains a tree of elements specifying a layout of widgets and containers that make up one View.

How retrieve data from SQLite database to spinner in Android?

Android SQLite Spinner tutorial. Today we explore how to insert/save data into sqlite database,then retrieve that data and show it in a spinner….

  1. Open Database Connection.
  2. Retrieve data saved in SQLite database.
  3. Close Connection.
  4. Return an arraylist containing retrieved data.

What is room database?

Room is an ORM, Object Relational Mapping library. In other words, Room will map our database objects to Java objects. Room provides an abstraction layer over SQLite to allow fluent database access while harnessing the full power of SQLite.

How do you get a spinner item?