Java 如何在Android中检测给定图像文件是否为动画GIF

我正在写一个图像编辑器

我不支持编辑动画gif，因此当用户选择图像时，如果该图像是动画gif，我需要显示错误消息

那么给定一个文件路径，我如何区分静态gif和动画gif呢

我检查了这个问题，但它不适用于Android，因为ImageIO类不可用

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注意：我只需要知道是否设置了动画，所以我希望使用最快的方法。下面的代码对我有效：

使用图像http url进行检查

URL url = new URL(path);
URLConnection conn = url.openConnection();
InputStream inputStream = conn.getInputStream();
ByteArrayOutputStream outStream = new ByteArrayOutputStream();

byte[] buffer = new byte[1024];
int len = 0;

while ((len = inputStream.read(buffer)) != -1) {
    outStream.write(buffer, 0, len);
}

inputStream.close();
byte[] bytes = outStream.toByteArray();

Movie gif = Movie.decodeByteArray(bytes, 0, bytes.length);
//If the result is true, its a animated GIF
if (gif != null) {
    return true;
} else {
    return false;
}

或通过从库中选择文件进行检查：

try {
    //filePath is a String converted from a selected image's URI
    File file = new File(filePath);
    FileInputStream fileInputStream = new FileInputStream(file);
    ByteArrayOutputStream outStream = new ByteArrayOutputStream();

    byte[] buffer = new byte[1024];
    int len = 0;

    while ((len = fileInputStream.read(buffer)) != -1) {
        outStream.write(buffer, 0, len);
    }

    fileInputStream.close();
    byte[] bytes = outStream.toByteArray();

    Movie gif = Movie.decodeByteArray(bytes, 0, bytes.length);
    //If the result is true, its a animated GIF
    if (gif != null) {
        type = "Animated";
        Log.d("Test", "Animated: " + type);
    } else {
        type = "notAnimated";
        Log.d("Test", "Animated: " + type);
   }
} catch (IOException ie) {
   ie.printStackTrace();
}

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Movie

类来自何处？它是一个android默认类，请查看：[link]该类在API级别28中被弃用。喜欢动画图像绘制。