Android™ How to Program, Second Edition

Method onCreateDialog

Method onCreateDialog (lines 25–61) inflates the custom View (lines 30–31) defined by fragment_line_width.xml that displays the GUI for selecting the line width, then attaches that View to the AlertDialog by calling AlertDialog.Builder’s setView method (line 32). Lines 39–40 get a reference to the ImageView in which the sample line will be drawn. Next, lines 43–47 get a reference to the widthSeekBar, register lineWidthChanged (lines 93–127) as the SeekBar’s listener and set the SeekBar’s current value to the current line width. Lines 50–58 define the dialog’s positive button to call the DoodleView’s setLineWidth method when the user touches the Set Line Width button. Line 60 returns the AlertDialog for display.