Android播放GIF动画

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1. <ImageViewandroid:id="@+id/gifpicture"  
2. android:layout_width="fill_parent"  
3. android:layout_height="wrap_content"  
4. android:src="@drawable/animation"   />

程序只能加载GIF动画的第一帧。效果如下： 

如果想要正常播放GIF动画，需要借助Movie实现。写了一个简单示例，程序目录结构如下： 

animation.gif是需要播放的GIF动画。 

MainActivity实现了加载GIF动画的功能。 

1. publicclassMainActivity extendsActivity {   
2.      
3.    privateMovie mMovie;   
4.    privatelongmMovieStart;  
5.      
6.    @Override  
7.    publicvoidonCreate(Bundle savedInstanceState) {   
8.        super.onCreate(savedInstanceState);   
9.       setContentView(newCustomGifView(this));   
10.          }  
11.    classCustomGifView extendsView {  
12.        publicCustomGifView(Context context) {   
13.            super(context);   
14.            mMovie = Movie.decodeStream(getResources().openRawResource(   
15.                    R.drawable.animation));  
16.        }   
17.          
18.        publicvoidonDraw(Canvas canvas) {  
19.            longnow = android.os.SystemClock.uptimeMillis();   
20.              
21.            if(mMovieStart == 0) { // first time  
22.                mMovieStart = now;   
23.            }   
24.            if(mMovie != null) {   
25.                  
26.                intdur = mMovie.duration();   
27.                if(dur == 0) {   
28.                    dur = 1000;   
29.                }   
30.                intrelTime = (int) ((now – mMovieStart) % dur);                  
31.                mMovie.setTime(relTime);   
32.                mMovie.draw(canvas, 0, 0);   
33.                invalidate();   
34.            }   
35.        }  
36.    }  
37. }

内部类CustomGifView 利用Movie播放GIF动画。解释一下： 

1. mMovie = Movie.decodeStream(getResources().openRawResource(R.drawable.animation));

将GIF动画以文件流的形式转换成Movie。 

1. publicvoidonDraw(Canvas canvas) {  
2.        longnow = android.os.SystemClock.uptimeMillis();   
3.          
4.        if(mMovieStart == 0) { // first time  
5.            mMovieStart = now;   
6.        }   
7.        if(mMovie != null) {   
8.              
9.            intdur = mMovie.duration();   
10.            if(dur == 0) {   
11.                dur = 1000;   
12.            }   
13.            intrelTime = (int) ((now – mMovieStart) % dur);                  
14.            mMovie.setTime(relTime);   
15.            mMovie.draw(canvas, 0, 0);   
16.            invalidate();   
17.        }   
18.    }

  invalidate();作用是刷新当前View，这样onDraw方法重复执行，Movie就能画出GIF动画的每一帧。到此，GIF动画就能正常播放了。 

源代码见：

http://bigcateasymorse.googlecode.com/svn/trunk/android_gif_demo/