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Android, including Layouts, Buttons, Lists, Surfaces, Clocks and more This means we can interact with all of these different types of View objects using touch events When the method is called, it can inspect the MotionEvent object to decide what to do For example, a MapView could use touch events to move the map sideways to allow the user to pan the map to other points of interest Or a virtual keyboard object could receive touch events to activate the virtual keys to provide text input to some other part of the user interface (UI) A MotionEvent object is one of a sequence of events related to a touch by the user The sequence starts when the user first touches the touchscreen, continues through any movements of the finger across the surface of the touchscreen, and ends when the finger is lifted from the touchscreen.

The initial touch (an ACTION_DOWN action), the movements sideways (ACTION_MOVE actions) and the up event (an ACTION_UP action) of the finger all create MotionEvent objects For ACTION_MOVE events, you could receive quite a few as the finger moves across the surface before you receive the final ACTION_UP event Each MotionEvent object contains information about what action is being performed, where the touch is taking place, how much pressure was applied, how big the touch was, when the action occurred, and when the initial ACTION_DOWN occurred There is a fourth possible action, which is ACTION_CANCEL This action is used to indicate that a touch sequence is ending without actually doing anything Finally, there is ACTION_OUTSIDE, which is set in a special case where a touch occurs outside of our window but we still get to find out about it.

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exception Invalid_argument of string This exception is raised by many libraries The argument is a string that often includes more detail about the specifics of the failure This exception is often used by library writers exception Failure of string This exception is also often used in libraries It is a general exception, and the string argument often includes more detail about the specifics of the failure exception Not_found This exception is raised by many libraries and searching functions when the search criteria are not found exception Out_of_memory This exception is raised by the garbage collector and is not catchable It indicates that the garbage collector could not allocate memory This exception is quite rare, and generally you would not try to catch this exception in common code exception Stack_overflow This exception is raised by the byte-code interpreter and is not fully implemented by the native code compiler.

There is another way to receive touch events, and that is to register a callback handler for touch events on a View object The class to receive the events must implement the ViewOnTouchListener interface, and the View object s setOnTouchListener() method must be called to setup the handler for that View The implementing class of the ViewOnTouchListener must implement the onTouch() method Whereas the onTouchEvent() method takes just a MotionEvent object as a parameter, onTouch() takes both a View and a MotionEvent object as parameters This is because the OnTouchListener could receive MotionEvent objects for multiple views This will become clearer with our next example application If a MotionEvent handler (either through the onTouchEvent() or onTouch() method) consumes the event and no one else needs to know about it, the method should return true.

Most widget toolkits offer one or more grid-based controls. Android has a GridView control that can display data in the form of a grid. Note that although we use the term data here, the contents of the grid can be text, images, and so on. The GridView control displays information in a grid. The usage pattern for the GridView is to define the grid in the XML layout (see Listing 4-20), and then bind the data to the grid using an android.widget.ListAdapter. Listing 4-20. Definition of a GridView in an XML Layout and Associated Java Code <GridView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/dataGrid" android:layout_width="fill_parent" android:layout_height="fill_parent" android:padding="10px" android:verticalSpacing="10px" android:horizontalSpacing="10px" android:numColumns="auto_fit" android:columnWidth="100px" android:stretchMode="columnWidth"

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