You can also add interactivity to your widgets using Remote Views, but reactions to user input are tightly restricted.
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Because they run within the home-screen process, the widgets themselves inherit its permissions. As a result of these security implications widget interactivity is carefully controlled.
Widget interaction is generally limited to two possibilities:
> Adding a click listener to one or more views within the layout
> Changing the UI based on selection changes
It's notable that there is no supported technique for entering text directly into an App Widget.
If you need text input from your widget, best practice is to add a click listener that displays an Activity to accept the user data when a portion of the widget is clicked.
One popular alternative is to use Image Views designed to look like Edit Text controls. By means of Selection State Drawables they can appear to gain focus. When the Image View is clicked, a partially transparent Activity is launched to accept the user input.
The most powerful technique for adding interactivity to your widget is through the use of the setOnClickPendingIntent method on a Remote Views object.
This lets you specify a Pending Intent that will be fired when the user clicks on the specified widget View. Pending Intents (described in more detail in Chapter 5) can contain Intents used to start Activities or Services or broadcast Intents.
Listing 10-10 demonstrates a broadcast Intent assigned to a Text View element within a widget layout:
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