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This tells Android that the event does not need to be passed to any other views If the View object is not interested in this event nor any future events related to this touch sequence, it returns false The onTouchEvent() method of the base class View doesn t do anything and returns false Subclasses of View may or may not do the same For example, a Button object will consume a touch event since a touch is equivalent to a click, and therefore returns true from the onTouchEvent() method Upon receiving an ACTION_DOWN event, the Button will change its color to indicate that it is in the process of being clicked, and the Button also wants to receive the ACTION_UP event to know when the user has let go so it can initiate the logic of clicking the button.

If a Button object returned false from onTouchEvent(), it would not receive any more MotionEvent objects to tell it when the user lifted their finger from the touchscreen..

This exception is most often raised by too-deep recursion This exception is often the result of programmer error and wrongly implemented functions instead of a more typical runtime error exception Sys_error of string This exception is raised by functions doing system-level actions The string argument often contains further information and sometimes operating system (OS) error messages exception End_of_file This exception is raised by functions doing input/output (I/O) when they have reached the end of a file or the end of input This exception is commonly caught when doing I/O operations exception Division_by_zero.

protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);

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When we want touch events to do something new with a particular View object, we can extend the class, override the onTouchEvent() method, and put our logic there. We can also implement the View.OnTouchListener interface and set up a callback handler on the View object. By setting up a callback handler with onTouch(), MotionEvents will be delivered there first before they go to the View s onTouchEvent() method. Only if the onTouch() method returned false would our View s onTouchEvent() method get called. Let s get to our example application where this should be easier to see. Listing 16 1 shows the XML of a layout file. Create a new Android project in Eclipse starting with this layout.

Listing 16 1. XML Layout File for TouchDemo1 < xml version="1.0" encoding="utf-8" > <!-- This file is res/layout/main.xml --> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <RelativeLayout android:id="@+id/layout1" android:tag="trueLayoutTop" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_weight="1" > <com.androidbook.touch.demo1.TrueButton android:text="returns true" android:id="@+id/trueBtn1" android:tag="trueBtnTop" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <com.androidbook.touch.demo1.FalseButton android:text="returns false" android:id="@+id/falseBtn1" android:tag="falseBtnTop" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/trueBtn1" /> </RelativeLayout> <RelativeLayout android:id="@+id/layout2" android:tag="falseLayoutBottom" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_weight="1" android:background="#FF00FF" > <com.androidbook.touch.demo1.TrueButton android:text="returns true" android:id="@+id/trueBtn2" android:tag="trueBtnBottom"

This exception is raised when you are trying to divide integers and integer-like numbers by zero or something zero-like. Floating-point numbers (floats) are divisible by zero because it yields infinity. Integers are not divisible by zero. exception Sys_blocked_io This is a special case of the Sys_error exception. It is raised only when operations are attempted on blocking I/O when the channel is blocked. This exception should be caught if you are using blocking I/O. If you are using blocking I/O, you probably already know this. exception Undefined_recursive_module of (string * int * int) This exception is raised when a recursive module definition is undefined. The arguments are the location of the module definition and include the filename, line number, and column number. Recursive module definitions are an experimental feature in OCaml. This means that the definition might change in the future (if you are using this, you probably already know that, too).

setContentView(R.layout.gridview); GridView gv = (GridView)this.findViewById(R.id.dataGrid); Cursor c = getContentResolver().query(People.CONTENT_URI, null, null, null, null); startManagingCursor(c); String[] cols = new String[]{People.NAME}; int[] names = new int[]{R.id.grid_entry}; SimpleCursorAdapter adapter = new SimpleCursorAdapter( this,R.layout.grid_item,c,cols,names); gv.setAdapter(adapter); } Listing 4-20 defines a simple GridView in an XML layout. The grid is then loaded into the activity s content view. The generated UI is shown in Figure 4-8.

android:layout_width="wrap_content" android:layout_height="wrap_content" /> <com.androidbook.touch.demo1.FalseButton android:text="returns false" android:id="@+id/falseBtn2" android:tag="falseBtnBottom" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/trueBtn2" /> </RelativeLayout> </LinearLayout>

A couple of things to point out about this layout. We ve incorporated tags on our UI objects. We ll be able to refer to these tags in our code as events occur on them. We ve also used RelativeLayouts to position our objects. Also notice how we ve used custom objects (TrueButton and FalseButton). You ll see in the Java code that these are classes extended from the Button class. Figure 16 1 shows what this layout looks like and Listing 16 2 shows our button Java code.

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