Action Bar Example

This simple example shows how to access an activity's action bar.

A screenshot of the application.

We import the classes and modules that will be needed by the application. The Window class is particularly relevant since we use a constant it defines to request access to the action bar feature.

from import Activity
import android.os
from android.view import Window
from android.widget import TextView

We define a class based on the standard Activity class. This represents the application, and will be used to present a graphical interface to the user.

class ActionBarActivity(Activity):

    def __init__(self):

The initialisation method simply calls the corresponding base class method to properly initialise the activity.

Similarly, the onCreate method calls the onCreate method of the base class to help set up the activity before creating a user interface.

    @args(void, [android.os.Bundle])
    def onCreate(self, bundle):
        Activity.onCreate(self, bundle)

We obtain the window shown by the activity and use its requestFeature method to request an action bar, and we create a TextView that we use to report the presence or absence of the action bar.

        window = self.getWindow()
        view = TextView(self)

Having requested an action bar feature, we attempt to obtain its corresponding object. If none exists, we set the TextView's text to indicate this. Otherwise we report its presence.

        bar = self.getActionBar()
        if bar == None:
            view.setText("No bar!")
            view.setText("Bar found!")

We make the TextView the main view of the activity, displaying its contents to the user.