Motorola T720 Developer's Manual page 51

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Coding Example

} // end constructor

As the code shows, using an LWT button is straightforward. You use the new constructor

and then the add() method to add the button to a LWT ComponentScreen. (The

instance of a ComponentScreen is made in the class DemoScreen.) Making a

RoundButton is no different: you use its new constructor and add it to the

ComponentScreen. Finally, you assign each button a listener, even if it is disabled.

For the second button, note how the button's right edge field can be set to reach to the

right edge of the screen. (Component.SCREEN_RIGHT).

For the third button, observe that by using the method setEnabled() with an

argument of false, it disables the button.

Now, let's change things and see what happens.

Step 1: Modify a button's visibility.

For the second button, b2, uncomment the statement:

This makes the second button invisible.

Step 2: Disable a button.

For the fourth button, b4, uncomment the statement

This disables the fourth button.

Step 3: Run the program and observe the results.

Build the project (Project | Make) and run it under debugger control (Project | Debug).

Start the debugger, (Project | Run) and notice that changes. The phone simulator's screen

should resemble Figure 21.

b2.setVisible(false);

b4.setEnabled(false);

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