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首先需要导入android-gif-drawable包，请参考：【android】实用教程：导入android-gif-drawable包，不用在github下载（android studio 3.1.2）
一、在layout中添加gifimageview控件，该控件既可以加载gif动态图，也可以加载jpg、png静态图。不需要设置src属性。
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二、在java文件中，给gifimageview设置src属性，加载gif动态图。
1、获取gifimageview控件。
gifimageview gifimageview = findviewbyid(r.id.image);
2、实例化gifdrawable对象，共有11种方法。
（1）resouces文件
：
/**
* creates drawable from resource.
*
* @param res resources to read from
* @param id resource id (raw or drawable)
* @throws notfoundexception if the given id does not exist.
* @throws ioexception when opening failed
* @throws nullpointerexception if res is null
*/
public gifdrawable(@nonnull resources res, @rawres @drawableres int id) throws notfoundexception, ioexception {
this(res.openrawresourcefd(id));
final float densityscale = gifviewutils.getdensityscale(res, id);
mscaledheight = (int) (mnativeinfohandle.getheight() * densityscale);
mscaledwidth = (int) (mnativeinfohandle.getwidth() * densityscale);
}
示例：
// resources file
gifdrawable giffromassets = new gifdrawable(getresources(), r.mipmap.timg);
（2）assets文件
源码：
/**
* creates drawable from asset.
*
* @param assets assetmanager to read from
* @param assetname name of the asset
* @throws ioexception when opening failed
* @throws nullpointerexception if assets or assetname is null
*/
public gifdrawable(@nonnull assetmanager assets, @nonnull string assetname) throws ioexception {
this(assets.openfd(assetname));
}
示例：
// assets file
gifdrawable giffromassets = new gifdrawable(getassets(), "timg.gif");
（3）文件路径
源码：
/**
* constructs drawable from given file path.
* only metadata is read, no graphic data is decoded here.
* in practice can be called from main thread. however it will violate
* {@link strictmode} policy if disk reads detection is enabled.
*
* @param filepath path to the gif file
* @throws ioexception when opening failed
* @throws nullpointerexception if filepath is null
*/
public gifdrawable(@nonnull string filepath) throws ioexception {
this(new gifinfohandle(filepath), null, null, true);
}
示例：
// path to the gif file
gifdrawable giffrompath = new gifdrawable("/path/timg.gif");
（4）file文件
源码：
/**
* equivalent to {@code} gifdrawable(file.getpath())}
*
* @param file the gif file
* @throws ioexception when opening failed
* @throws nullpointerexception if file is null
*/
public gifdrawable(@nonnull file file) throws ioexception {
this(file.getpath());
}
示例：
// the gif file
file giffile = new file(getfilesdir(), "timg.gif");
gifdrawable giffromfile = new gifdrawable(giffile);
（5）输入流stream to read from
源码：
/**
* creates drawable from inputstream.
* inputstream must support marking, illegalargumentexception will be thrown otherwise.
*
* @param stream stream to read from
* @throws ioexception when opening failed
* @throws illegalargumentexception if stream does not support marking
* @throws nullpointerexception if stream is null
*/
public gifdrawable(@nonnull inputstream stream) throws ioexception {
this(new gifinfohandle(stream), null, null, true);
}
（6）assetfiledescriptor
源码：
/**
* creates drawable from assetfiledescriptor.
* convenience wrapper for {@link gifdrawable#gifdrawable(filedescriptor)}
*
* @param afd source
* @throws nullpointerexception if afd is null
* @throws ioexception when opening failed
*/
public gifdrawable(@nonnull assetfiledescriptor afd) throws ioexception {
this(new gifinfohandle(afd), null, null, true);
}
示例：
// creates drawable from assetfiledescriptor
assetfiledescriptor assetfiledescriptor = getassets().openfd("timg.gif");
gifdrawable giffromafd = new gifdrawable(assetfiledescriptor);
（7）filedescriptor
源码：
/**
* creates drawable from filedescriptor
*
* @param fd source
* @throws ioexception when opening failed
* @throws nullpointerexception if fd is null
*/
public gifdrawable(@nonnull filedescriptor fd) throws ioexception {
this(new gifinfohandle(fd), null, null, true);
}
示例：
// creates drawable from filedescriptor
filedescriptor filedescriptor = new randomaccessfile("/path/timg.gif", "r").getfd();
gifdrawable giffromfd = new gifdrawable(filedescriptor);
（8）raw gif bytes
源码：
* creates drawable from byte array.
* it can be larger than size of the gif data. bytes beyond gif terminator are not accessed.
*
* @param bytes raw gif bytes
* @throws ioexception if bytes does not contain valid gif data
* @throws nullpointerexception if bytes are null
*/
public gifdrawable(@nonnull byte[] bytes) throws ioexception {
this(new gifinfohandle(bytes), null, null, true);
}
（9）bytebuffer
源码：
/**
* creates drawable from {@link bytebuffer}. only direct buffers are supported.
* buffer can be larger than size of the gif data. bytes beyond gif terminator are not accessed.
*
* @param buffer buffer containing gif data
* @throws ioexception if buffer does not contain valid gif data or is indirect
* @throws nullpointerexception if buffer is null
*/
public gifdrawable(@nonnull bytebuffer buffer) throws ioexception {
this(new gifinfohandle(buffer), null, null, true);
}
（10）contentresolver
源码：
/**
* creates drawable from {@link android.net.uri} which is resolved using {@code resolver}.
* {@link android.content.contentresolver#openassetfiledescriptor(android.net.uri, string)}
* is used to open an uri.
*
* @param uri gif uri, cannot be null.
* @param resolver resolver used to query {@code uri}, can be null for file:// scheme uris
* @throws ioexception if resolution fails or destination is not a gif.
*/
public gifdrawable(@nullable contentresolver resolver, @nonnull uri uri) throws ioexception {
this(gifinfohandle.openuri(resolver, uri), null, null, true);
}
（11）inputsource
源码：
/**
* creates drawable from {@link inputsource}.
*
* @param inputsource the {@link inputsource} concrete subclass used to construct {@link gifdrawable}.
* @param olddrawable the old drawable that will be reused to save the memory. can be null.
* @param executor the executor for rendering tasks. can be null.
* @param isrenderingtriggeredondraw true if rendering of the next frame is scheduled after drawing current one, false otherwise.
* @param options options controlling various gif parameters.
* @throws ioexception if input source is invalid.
*/
protected gifdrawable(@nonnull inputsource inputsource,
@nullable gifdrawable olddrawable,
@nullable scheduledthreadpoolexecutor executor,
boolean isrenderingtriggeredondraw,
@nonnull gifoptions options) throws ioexception {
this(inputsource.createhandlewith(options), olddrawable, executor, isrenderingtriggeredondraw);
}
3、设置gifimageview控件的src。
gifimageview.setimagedrawable(gifdrawable);
gifimageview控件可以加载静态图，步骤如下：
drawable drawable = getdrawable(r.mipmap.ic_launcher);
gifimageview.setimagedrawable(drawable);
gifdrawable类的对象读取静态图可能会报错。
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