?giflib是一款用C语言写的加载GIF库，在性能方面比Glide要好很多，首先来看一下性能对比。
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glide加载gif 
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giflib加载gif ?从上图中我们可以看出在CPU使用率上，giflib比glide好很多了，内存占用上giflib比glide也要好一些。那么如何使用giflib尼？
?首先需要下载framesequence及giflib（以上网站需要，请自备梯子）
?giflib文件目录如下：
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?framesequence文件目录如下：
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?下载完毕后，我们就将framesequence下的jni目录复制到as的main下，giflib复制到jni/giflib目录下。目录结构如下（删除了与webp相关的文件）：
【Android|giflib加载GIF】
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?这样就可以开始编译so文件了，但是由于giflib使用的是Android.bp进行编译的（不会呀o(╥﹏╥)o）。所有我就根据Android.bp来重新写了份Android.mk文件，然后ndk-build该文件即可。
#
# Copyright (C) 2014 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := gif
LOCAL_SRC_FILES := \
giflib/dgif_lib.c \
giflib/egif_lib.c \
giflib/gifalloc.c \
giflib/gif_err.c \
giflib/gif_hash.c \
giflib/openbsd-reallocarray.c \
giflib/quantize.cLOCAL_CFLAGS += \
-Werror \
-Wno-format \
-Wno-sign-compare \
-Wno-unused-parameter \
-DHAVE_CONFIG_H \LOCAL_SDK_VERSION := 8include $(BUILD_STATIC_LIBRARY)include $(CLEAR_VARS)
## Main libraryLOCAL_STATIC_LIBRARIES := gifLOCAL_LDFLAGS := -llog -ljnigraphicsLOCAL_C_INCLUDES := \
giflibLOCAL_MODULE := framesequence
LOCAL_SRC_FILES := \
BitmapDecoderJNI.cpp \
FrameSequence.cpp \
FrameSequenceJNI.cpp \
FrameSequence_gif.cpp \
JNIHelpers.cpp \
Registry.cpp \
Stream.cppifeq ($(FRAMESEQUENCE_INCLUDE_WEBP),true)
LOCAL_C_INCLUDES += external/webp/include
LOCAL_SRC_FILES += FrameSequence_webp.cpp
LOCAL_STATIC_LIBRARIES += libwebp-decode
endifLOCAL_CFLAGS += \
-Wall \
-Werror \
-Wno-unused-parameter \
-Wno-unused-variable \
-Wno-overloaded-virtual \
-fvisibility=hidden \LOCAL_SDK_VERSION := 8include $(BUILD_SHARED_LIBRARY)
?由于没有使用CMake，所以应该在build.gradle下进行如下配置
externalNativeBuild{?最后我们点击
ndkBuild{
path “src/main/jni/Android.mk”
}
}
rebuild即可生成so文件。那么如何使用尼？?在使用之前需要将
framesequence目录下的src里面的所有文件拷贝到as的Java目录下。然后就可以使用了。使用代码如下（也可以去阅读framesequence下的示例代码）：
FrameSequenceDrawable mDrawable;
int mResourceId;
// This provider is entirely unnecessary, just here to validate the acquire/release process
private class CheckingProvider implements FrameSequenceDrawable.BitmapProvider {
HashSet mBitmaps = new HashSet();
@Override
public Bitmap acquireBitmap(int minWidth, int minHeight) {
Bitmap bitmap =
Bitmap.createBitmap(minWidth + 1, minHeight + 4, Bitmap.Config.ARGB_8888);
mBitmaps.add(bitmap);
return bitmap;
}@Override
public void releaseBitmap(Bitmap bitmap) {
if (!mBitmaps.contains(bitmap)) throw new IllegalStateException();
mBitmaps.remove(bitmap);
bitmap.recycle();
}public boolean isEmpty() {
return mBitmaps.isEmpty();
}
}final CheckingProvider mProvider = new CheckingProvider();
//传入资源，设置相关参数
InputStream is = getResources().openRawResource(mResourceId);
FrameSequence fs = FrameSequence.decodeStream(is);
//传入的是InputStream
mDrawable = new FrameSequenceDrawable(fs, mProvider);
//mDrawable.setLoopBehavior(LOOP_FINITE);
//只播放一次
mDrawable.setOnFinishedListener(new FrameSequenceDrawable.OnFinishedListener() {
@Override
public void onFinished(FrameSequenceDrawable drawable) {
Toast.makeText(getApplicationContext(),
"The animation has finished", Toast.LENGTH_SHORT).show();
}
});
drawableView.setBackgroundDrawable(mDrawable);
//开始播放
mDrawable.start();
//暂停播放
mDrawable.stop();
//裁剪成圆形
mDrawable.setCircleMaskEnabled(!mDrawable.getCircleMaskEnabled());
?目前giflib加载的都是本地的，那么如何加载线上GIF尼？其实可以把giflib与glide结合起来，由glide负责下载、缓存等的实现，giflib来负责GIF的加载。具体实现可以参考我写的一个demo
