Android 編寫簡單的動畫

UIImageView提供了實現簡單動畫的功能。比如要實現這樣的功能：

跳動的火焰。基本思路是，一個數組，包含火焰跳動所需的多張圖片。然後設置播放時間，並開始播放。UIImageView已經提供了這方面的機制，只需把圖片數組交給它，並設置播放間隔，是否循環播放，以及何時開始，就可以了。

代碼如下：

  UIImageView *contentView = [[MyUIImageView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]];

   contentView.animationImages=[NSArray arrayWithObjects:   
                                 [UIImage imageNamed:@"campFire01.gif"],
                                 [UIImage imageNamed:@"campFire02.gif"],
                                 [UIImage imageNamed:@"campFire03.gif"],
                                 [UIImage imageNamed:@"campFire04.gif"],
                                 [UIImage imageNamed:@"campFire05.gif"],
                                 [UIImage imageNamed:@"campFire06.gif"],
                                 [UIImage imageNamed:@"campFire07.gif"],
                                 [UIImage imageNamed:@"campFire08.gif"],
                                 [UIImage imageNamed:@"campFire09.gif"],
                                 [UIImage imageNamed:@"campFire10.gif"],
                                 [UIImage imageNamed:@"campFire11.gif"],
                                 [UIImage imageNamed:@"campFire12.gif"],
                                 [UIImage imageNamed:@"campFire13.gif"],
                                 [UIImage imageNamed:@"campFire14.gif"],
                                 [UIImage imageNamed:@"campFire15.gif"],
                                 [UIImage imageNamed:@"campFire16.gif"],
                                 [UIImage imageNamed:@"campFire17.gif"], nil];
   
    // all frames will execute in 1.75 seconds
    contentView.animationDuration = 1.75;
    // repeat the annimation forever
    contentView.animationRepeatCount = 0;
    // start animating
    [contentView startAnimating];

=====================================本文參考，可下載文章後面的zip包，並取出有關火焰的圖片，放置在resources目錄下即可。=================================================================

For day 2 I picked something that has been popular in the App Store?揂nimations?  The first App I did was iFlame which was a simple video of a flame I shot myself.  At the time I had not seen a flame or lighter in the App Store and thought it would be cool to have a flame to hold up at a concert.  My first challenge was getting my flame video to repeat without a pause.   Then, I soon saw Crazy Lighter and wondered how they got it working with an infinite loop.  I cannot say this is 搕he?way that Crazy Lighter works but this will do for us.  Instead of using a video you can use a UIImageView with a sequence of images and just loop them.  The key section of code is below.

       // create the view that will execute our animation
     UIImageView* campFireView = [[UIImageView alloc] initWithFrame:self.view.frame];
     
     // load all the frames of our animation
     campFireView.animationImages = [NSArray arrayWithObjects:   
                                 [UIImage imageNamed:@"campFire01.gif"],
                                 [UIImage imageNamed:@"campFire02.gif"],
                                 [UIImage imageNamed:@"campFire03.gif"],
                                 [UIImage imageNamed:@"campFire04.gif"],
                                 [UIImage imageNamed:@"campFire05.gif"],
                                 [UIImage imageNamed:@"campFire06.gif"],
                                 [UIImage imageNamed:@"campFire07.gif"],
                                 [UIImage imageNamed:@"campFire08.gif"],
                                 [UIImage imageNamed:@"campFire09.gif"],
                                 [UIImage imageNamed:@"campFire10.gif"],
                                 [UIImage imageNamed:@"campFire11.gif"],
                                 [UIImage imageNamed:@"campFire12.gif"],
                                 [UIImage imageNamed:@"campFire13.gif"],
                                 [UIImage imageNamed:@"campFire14.gif"],
                                 [UIImage imageNamed:@"campFire15.gif"],
                                 [UIImage imageNamed:@"campFire16.gif"],
                                 [UIImage imageNamed:@"campFire17.gif"], nil];
     
     // all frames will execute in 1.75 seconds
     campFireView.animationDuration = 1.75;
     // repeat the annimation forever
     campFireView.animationRepeatCount = 0;
     // start animating
     [campFireView startAnimating];
     // add the animation view to the main window
     [self.view addSubview:campFireView];

See ya?tomorow
Download Source Code:  Bonfire.zip