Changes

Once imported, install and run the GestureBuilder utility on an Android device attached to the development system.

== Creating a Gestures File ==

On the form factors screen, enable the Phone and Tablet option and set the minimum SDK setting to API 8: Android 2.2 (Froyo). Continue to proceed through the screens, requesting the creation of an empty activity named CustomGesturesActivity with a corresponding layout file named activity_custom_gestures.

Click on the Finish button to initiate the project creation process.

}

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In addition to some necessary import directives, the above code changes to the onCreate() method also create a GestureLibrary instance named gLibrary and then loads into it the contents of the gestures file located in the raw resources folder. The activity class has also been modified to implement the OnGesturePerformedListener interface, which requires the implementation of the onGesturePerformed callback method (which will be created in a later section of this chapter).

}

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When a gesture on the gesture overlay view object is detected by the Android runtime, the onGesturePerformed method is called. Passed through as arguments are a reference to the GestureOverlayView object on which the gesture was detected together with an object of type Gesture. The Gesture class is designed to hold the information that defines a specific gesture (essentially a sequence of timed points on the screen depicting the path of the strokes that comprise a gesture).

Within the activity_pinch_example.xml file, locate the TextView object and double click on it to change the ID to myTextView.

Locate and load the PinchExampleActivity.java file into the Android Studio editor and modify the file as follows: