Android spinner: drop down list control

Spinner provides a drop-down list input method, which can effectively save the display space on the mobile phone screen. Here is a simple example to explain how to use spinner. Add a button in the layout file main.xml of the project widgetdemo to start spinneractivity. Add the following code in main.xml:

Click button and start spinneractivity as follows

At the same time, declare the activity in the androidmanifest.xml file:

<activity android:name=".SpinnerActivity "></activity>

The running effect of spinneractivity is shown in Figure 1.

The layout file used by spinneractivity is spinner.xml, and its code is as follows:

The code of spinneractivity.java file is as follows:

Spinneractivity initializes spinner and handles events in five steps:

In this example, spinneractivity dynamically establishes the contents of each item in the drop-down list in the program code. In addition, you can also define the drop-down list item of spinner in the XML file. The steps are as follows. 1) Create a new cities.xml folder under RES / values folder:

2) Initialize spinner in spinneractivity.java:

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