barcode generator visual basic 6 source code Programmatically creating an animation in Java

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Programmatically creating an animation
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In the previous section, we used Android s frame-by-frame animation capabilities to show a series of images in a loop that gives the impression of movement. In this next section, we re going to programmatically animate a globe so that it moves around the screen. To create this animation, we re going to animate a graphics file (a PNG file) with a ball that appears to be bouncing around inside our Android viewing window. We ll create a Thread in which our animation will run, and a Handler that ll help communicate messages back to our program that reflect the changes in the state of our animation. We ll use this same approach in section 9.3 when we talk about Open GL ES. You ll find this approach is useful for creating most complex graphics applications and animations.
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CREATING THE PROJECT
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In this section, we ll look at a simple animation technique that uses an image bound to a sprite. The image moves that sprite around the screen to give the appearance of a bouncing ball. To get started, create a new project called BouncingBall with a BounceActivity. You can copy and paste the code in the following listing for the BounceActivity.java file.
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Listing 9.13 BounceActivity.java
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public class BounceActivity extends Activity { protected static final int GUIUPDATEIDENTIFIER = 0x101; Thread myRefreshThread = null; BounceView myBounceView = null; Handler myGUIUpdateHandler = new Handler() { public void handleMessage(Message msg) { switch (msg.what) { case BounceActivity.GUIUPDATEIDENTIFIER: myBounceView.invalidate();
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Create a unique identifier
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Create a handler
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Creating animations with Android s Graphics API
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break; } super.handleMessage(msg);
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} }; @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); Create this.requestWindowFeature(Window.FEATURE_NO_TITLE); the view this.myBounceView = new BounceView(this); this.setContentView(this.myBounceView); new Thread(new RefreshRunner()).start(); } Run the class RefreshRunner implements Runnable { animation public void run() { while (!Thread.currentThread().isInterrupted()) { Message message = new Message(); message.what = BounceActivity.GUIUPDATEIDENTIFIER; BounceActivity.this.myGUIUpdateHandler .sendMessage(message); try { Thread.sleep(100); } catch (InterruptedException e) { Thread.currentThread().interrupt(); } } } } }
First, we import the Handler and Message classes, and then we create a unique identifier to allow us to send a message back to our program to update the view in the main thread. We need to send a message telling the main thread to update the view each time the child thread has finished drawing our ball. Because different messages can be thrown by the system, we need to guarantee the uniqueness of our message to our handler by creating a unique identifier called GUIUPDATEIDENTIFIER B. Next, we create the Handler that ll process our messages to update the main view C. A Handler allows us to send and process Message classes and Runnable objects associated with a thread s message queue. Handlers are associated with a single thread and its message queue. We ll use the Handler to allow our objects running a thread to communicate changes in state back to the program that spawned them, or vice versa.
NOTE
For more information about handling long-running requests in your applications, see http://developer.android.com/reference/android/app/ Activity.html.
We set up a View D and create the new thread. Finally, we create a RefreshRunner inner class implementing Runnable that ll run unless something interrupts the thread, at which point a message is sent to the Handler to call its invalidate() method E. The invalidate method invalidates the View and forces a refresh.
Graphics and animation
You ve got your new project. Now you need to create the code that ll do your animation and create a View.
MAKING ANIMATION HAPPEN
We re going to use an image of a globe, which you can obtain at http://www.manning. com/AndroidinActionSecondEdition. Alternatively, you can use any other PNG file you d like to use. We also want to have the Android logo as our background, which you can find with the source code downloads. Make sure to drop the images under res/drawable/. Next, create a Java file called BounceView, copy the code from the following listing, and paste it into your editor.
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