ToggleButton
In this section, you'll create a button used specifically for toggling
between two states, using the
ToggleButton widget. This
widget is an excellent alternative to radio buttons if you have two
simple states that are mutually exclusive ("on" and "off", for
example). Android 4.0 (API level 14) introduced an alternative to the
toggle button known as a
Switch.
An example of a ToggleButton can be seen in the left hand pair of images, while the right hand pair of images presents an example of a Switch:
Which control an application uses is a matter of style. Both widgets are functionally equivalent.
Open the Resources/layout/Main.axml file and add the
ToggleButton element
(inside the
LinearLayout):
To do something when the state is changed, add the following code
to the end of the
OnCreate()
method:
ToggleButton togglebutton = FindViewById<ToggleButton>(Resource.Id.togglebutton);
togglebutton.Click += (o, e) => {
// Perform action on clicks
if (togglebutton.Checked)
Toast.MakeText(this, "Checked", ToastLength.Short).Show ();
else
Toast.MakeText(this, "Not checked", ToastLength.Short).Show ();
};
This captures the
ToggleButton element
from the layout, and handles the Click event, which defines the
action to perform when the button is clicked. In this example, the
method checks the new state of the button, then shows a
Toast message that indicates
the current state.
Notice that the
ToggleButton handles
its own state change between checked and unchecked, so you just ask
which it is.
Run the application.
Tip
If you need to change the state yourself (such as
when loading a saved
CheckBoxPreference),
use the
Checked
property setter or
Toggle()
method.