Contents xiiiGridLayout Parameters: Configuring Your Grid 272
GridLayout Alignment: The UseDefaultMargins Constant 274
Changing the Widget Order Inside of the GridLayout 276
Combining GridLayout Cells: Using a Span 282
Align GridLayout Cells: Using the layout_gravity Parameter 284
Using the Android SlidingPaneLayout Class 286
The Android SlidingPaneLayout: Class Specification 287
Using SlidingPaneLayout: Galaxy Selector 291
Creating a SlidingPaneLayout: Revising the XML 292
Set Pane Size: layout_width and layout_weight 298Summary 299
■ Chapter 9: Android Graphic Design: Making Your UI Designs Visual ����������������������������� 301
Imaging Concepts, Formats, and Techniques 302
The Foundation of Digital Images: The “Pixel” 302
The Shape of a Digital Image: The Aspect Ratio 303
Coloring Your Digital Images: RGB Color Theory 304
Image Compositing Transparency: Alpha Channels 306
Algorithmic Image Compositing: Blending Modes 307
Masking Digital Imagery: Using Alpha Channels 308
Smoothing Edges: The Concept of Anti-Aliasing 309
Optimizing Digital Images: Compress and Dither 310
Using Indexed Color Imagery: Dithering Pixels 311
Android Image Formats: Lossless Versus Lossy 313
Creating Android NinePatchDrawable Assets 314
Installing Your Android Draw 9-patch Software 314
Opening the Source Digital Image in Draw 9-patch 316
Exploring Your New Draw 9-patch Editing Software 317
Defining Your NinePatchDrawable Scalable Areas 318
Defining Your NinePatchDrawable Padding Areas 321
Saving Your NinePatchDrawable Asset in Android 325
The ImageButton Class: Multi-state Buttons 326
The States: Normal, Pressed, Focused, Hovered 327