Chapter 10: Move! Creating Animation

Objectives In this chapter, you learn to: Create an Android application with Frame and Tween animation Understand Frame animation Understand Tween animation Add an animation-list XML file Code the AnimationDrawable object Set the background Drawable resource Launch the start( ) and stop( ) methods Android Boot Camp for Developers using Java

Objectives (continued) Add Tween animation to the application Create a Tween XML file that rotates an image Determine the rotation pivot, duration, and repeat count of a Tween animation Load the startActivity Tween animation in a second Activity Change the orientation of the emulator Android Boot Camp for Developers using Java

Creating Animation Animation is everywhere Words with Friends Angry Birds Cut the Rope Roller Ball A motion tween is used to animate the object Specifies start state Transition type Number of times to animate Figure 10-2 Wave Animation Android app using Tween animation Android Boot Camp for Developers using Java

Creating Animation (continued) Steps to complete the App: Add the four images to the drawable folder. Add a Frame animation XML file to the project. Add the layout for the image and button objects in main.xml. Set the duration between frames in the frame-by-frame animation. Declare and instantiate the ImageView, Button, and AnimationDrawable controls. Code the OnClickListeners for the Button controls. Run the frame-by-frame Animation application. Add a layout for an ImageView control for the Tween animation. Add a Tween animation XML file to rotate the last surfing image. Create a second Activity named Tween.java to launch the rotation Tween animation. When the application executes, change the orientation of the emulator. Android Boot Camp for Developers using Java

Android Animation Two types of animation for Android: Frame animation A sequence of photos playing as a slide show Similar to cartoon animation Images rapidly replaced by new, similar images Tween animation Created by a series of transformations on a single image Transformations include position, size, shape rotation, color, and transparency Android Boot Camp for Developers using Java

Adding the Layout for the Frame Image and Button Controls This app requires nested layout – relative layout within a linear layout Linear layout ImageView control displays the animation images Relative layout Buttons arranged side by side (not allowed in linear layout) Android Boot Camp for Developers using Java

Adding the Layout for the Frame Image and Button Controls (continued) Figure 10-5 Two button controls in XML code Android Boot Camp for Developers using Java

Adding the Layout for the Frame Image and Button Controls (continued) Creating Frame-by-frame Animation Animation-list root element is needed to reference images stored in the drawable folders Set the android:oneshot property to false for the animation plays repeatedly <?xml version="1.0" encoding="utf-8"?> <animation-list xmlns:android="http://schemas.android.com/apk/res/android" android:oneshot="false" > <item android:drawable="@drawable/surf1" android:duration="100"/> <item android:drawable="@drawable/surf2" android:duration="100"/> <item android:drawable="@drawable/surf3" android:duration="100"/> <item android:drawable="@drawable/surf4" android:duration="100"/> </animation-list> Android Boot Camp for Developers using Java

Coding the AnimationDrawable Object The AnimationDrawable class Contains methods to sequence frame-by-frame images Figure 10-10 Instantiating AnimationDrawable Android Boot Camp for Developers using Java

Setting the Background Resource Image backgrounds can be set to: A 9-patch image Contains pre-defined stretching areas that maintain the same look on different screen sizes Named for the nine areas, called patches, that scale separately A solid color background Android Boot Camp for Developers using Java

Setting the Background Resource (continued) Figure 10-13 getBackground prepares the Animation drawable Android Boot Camp for Developers using Java

Adding Two Button Controls Figure 10-14 btFrame is the instance of the first button Figure 10-15 btTween is the instance of the second button Android Boot Camp for Developers using Java

Adding Two Button Controls (continued) Figure 10-16 First button OnClickListener Android Boot Camp for Developers using Java

Adding Two Button Controls (continued) Figure 10-17 Second button OnClickListener Android Boot Camp for Developers using Java

Using the Start and Stop Methods Figure 10-18 Entering the start() method Figure 10-19 Entering the stop() method Android Boot Camp for Developers using Java

Using the Start and Stop Methods (continued) Adding the Layout for the Tween Image Figure 10-21 ImageView control coded in tween.xml Android Boot Camp for Developers using Java

Using the Start and Stop Methods (continued) Creating Tween Animation Tween effects are transitions that change objects from one state to another Table10-1 Tween animation effects Android Boot Camp for Developers using Java

Using the Start and Stop Methods (continued) Coding a Tween Rotation XML File <?xml version="1.0" encoding="utf-8"?> <rotate xmlns:android="http://schemas.android.com/apk/res/android" android:fromDegrees="0" android:toDegrees="359" android:pivotX="50%" android:pivotY="50%" android:duration="2000" android:repeatCount="5" rotate /> Android Boot Camp for Developers using Java

Using the Start and Stop Methods (continued) Coding a Second Activity to Launch the Tween Animation Figure 10-25 Main.java launches the second Activity (complete code for Main.java) Android Boot Camp for Developers using Java

Using the Start and Stop Methods (continued) Coding a StartAnimation Figure 10-26 onCreate method in Tween.java Figure 10-27 tween.xml layout is set Android Boot Camp for Developers using Java

Using the Start and Stop Methods (continued) Figure 10-28 ImageView is instantiated Figure 10-29 Image rotates using Tween animation (complete code for Tween.java) Android Boot Camp for Developers using Java

Using the Start and Stop Methods (continued) Updating the Android Manifest File Figure 10-30 Adding the Tween Activity to the Android Manifest File Android Boot Camp for Developers using Java

Using the Start and Stop Methods (continued) Updating the Android Manifest File Figure 10-31 Adding the theme to the Android Manifest File Android Boot Camp for Developers using Java

Changing the Emulator to Landscape Orientation Most Android devices automatically rotate the display from portrait to landscape when the user turns the device The default screen orientation layout is vertical Ctrl + F12 rotates the phone emulator to landscape orientation You can also press the 7 key on the keypad when Num Lock is turned off Android Boot Camp for Developers using Java

Running and Testing the Application Click Run on the menu bar Select Android Application from the dialog box Save all the files when prompted Unlock the emulator (if necessary) Click the Start Frame Animation and begin the rotation The animation should rotate six times and then end Android Boot Camp for Developers using Java

Summary Frame animation and Tween animation are the two types of animation provided by Android Nest a relative layout within a linear layout to display two controls side by side To create frame animation, load images in a drawable folder and then create an animation list Set the oneshot property of the animation-list to false to repeatedly play the animation In the XML file, select drawable as the resource type and animation-list as the root element Android Boot Camp for Developers using Java

Summary (continued) Frame-based animations and image transitions are defined as drawables in Android Development The Background property can be set to any full drawable resource Main.java includes an instance of AnimationDrawable and assigns it as the background of the animation images. Android constructs an AnimationDrawable Java object before setting it as the background Android Boot Camp for Developers using Java

Summary (continued) Use the start( ) and stop( ) methods of the drawable objects to control a Frame animation A Tween animation manipulates a Drawable image by adding tween effects, which are predefined transitions that change an object from one state to another The XML file for a Tween animation defines rotate attributes such as the number of degrees to spin, the pivot location, the rotation duration, and the number of times to repeat the rotation Android Boot Camp for Developers using Java

Summary (continued) To launch a Tween animation, use the startAnimation method, which begins animating a View object by calling the AnimationUtils class utilities to access the resources it needs to play the animation To switch the emulator to use a landscape orientation on a PC, press the Ctrl+F12 keys. To rotate the emulator to the original portrait position, press the Ctrl+F12 keys again. Mac users can press the Fn+Ctrl+F12 keys to change the orientation Android Boot Camp for Developers using Java