Android drop-down list option box and indicator arrow animation

The Android native spinner provides a drop-down list option box, but in some popular apps, the native spinner seems to be less popular, and usually has a drop-down list option box as shown in the following figure:

Initialization status:

Click to pop up the drop-down selection option box:

When selected:

Pay attention to the indicating arrow. If the control is written more finely, the arrow should have animation rotation effect in the process of pull-down, selection and reset.

There are many implementation schemes of this style of selection box, which are common and commonly used. I wrote one myself. The code running result of the example I wrote is shown in the figure above.

The first is mainactivity.java:

Layout file:

The background of LinearLayout needs a rounded background RES / drawable / round_ corner_ line_ radius_ 3dp.xml：

Arrow icon.png:

Attachment: Android third-party open source drop-down box nicepinner

The above is the whole content of this article. I hope it will be helpful to your study, and I hope you can support programming tips.