Android中Movie导入播放GIF图片文件异常IOException.reset

is=context.getResources().openRawResource(R.drawable.mygif);
movie = Movie.decodeStream(is);

java.io.IOException
at java.io.InputStream.reset(InputStream.java:218)
at android.graphics.Movie.decodeStream(Native Method)
at android.graphics.Movie.decodeTempStream(Movie.java:74)
at android.graphics.Movie.decodeFile(Movie.java:59)

InputStream is = null;
try {
is = new BufferedInputStream(new FileInputStream(new File(getCacheDir(), "mygif.gif")), 16 * 1024);
is.mark(16 * 1024);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
movie = Movie.decodeStream(is);