A (175)

xiv Contents

Creating Multi-State Imagery: Using GIMP  328

Using GIMP for Compositing: Importing a Layer  330

Creating an Alpha Channel: Fuzzy Select Tool  332

Creating a Composite Layer Using the Clipboard  335

Creating Five Resolution Density Button Versions  338

Creating Your Other Three ImageButton States  340

Creating Your ImageButton’s XML Structure  345

Referencing Multi-State XML via activity_main  347

Adding a NinePatch to a SlidingPaneLayout  348

Summary  350

■ Chapter 10: Android Animation: Making Your UI Designs Move ������������������������������������ 353

Frame Animation Concepts and Techniques  354

Frame Animation: Cels, Frames, and Terminology  354

Frame Animation Formats: PNG, GIF, JPEG & WebP  354

Optimizing Frames: Color Depth and Frame Count  355

Animation Resolution: Pixels Add to File Size!  356

The Android AnimationDrawable Class 357

Creating Frame Animation Using XML Markup  358

The <animation-list> Tag: Your Frame Container  359

The <item> Tag: How to Add in Animation Frames  359

Creating Frame Animation in MainActivity  360

Creating an anim_milkywayxml File and Markup  360

Wiring-Up Your Animation: Referencing Your XML  362

Resizing Source Imagery: Using Padding Values  364

Testing Your SlidingPane in a Galaxy Nexus AVD  365

Tween Animation Concepts and Techniques  367

Procedural Concepts: Rotate, Scale, Translate  367

Procedural Data Values: Ranges and Pivot Point  368

Procedural Compositing: Alpha Blending  369

Procedural Timing: Using Duration and Offsets  370