Changes

4. Implementation of the onTouchEvent() callback method on the enclosing activity which, in turn, must call the onTouchEvent() method of the GestureDetectorCompat instance, passing through the current motion event object as an argument to the method.

Once implemented, the result is a set of methods within the application code that will be called when a gesture of a particular type is detected. The code within these methods can then be implemented to perform any tasks that need to be performed in response to the corresponding gesture.

}

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Declaring that the class implements the listener interfaces mandates that the corresponding methods also be implemented in the class:

Note that many of these methods return true. This indicates to the Android Framework that the event has been consumed by the method and does not need to be passed to the next event handler in the stack.

== Creating the GestureDetectorCompat Instance ==

}

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== Implementing the onTouchEvent() Method ==

Compile and run the application on either a physical Android device or an AVD emulator. Once launched, experiment with swipes, presses, scrolling motions and double and single taps. Note that the text view updates to reflect the events as illustrated in Figure 22-1:

[[Image:android_studio_common_gestures_1.4.png]]

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