Android Tutorial

Android Tutorial 181

A ToggleButton is similar to a CheckBox, but you use it to visually

show the state. The default behavior of a toggle is like that of a

power on/off button.

A RadioButton provides selection of an item. Grouping RadioButton

controls together in a container called a RadioGroup enables the

developer to enforce that only one RadioButton is selected at a

time.

Using Basic Buttons

The android.widget.Button class provides a basic button

implementation in the Android SDK. Within the XML layout

resources, buttons are specified using the Button element. The

primary attribute for a basic button is the text field. This is the label

that appears on the middle of the

button’s face. You often use basic Button

controls for buttons with text such as

“Ok,”“Cancel,” or “Submit.”

Various types of button controls.

The following XML layout resource file

shows a typical Button control definition:

<Button
android:id=”@+id/basic_button”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”
android:text=”Basic Button” />

A button won’t do anything, other than

animate, without some code to handle