如何在android上 使用gif图片（android开源库android-gif-drawabl）
android开源库android-gif-drawable的使用
android的开源库是用来在android上显示gif图片的。我在网上查了一下，大家说这个框架写的不错，加载大的gif图片 不会内存溢出，于是我就想试试这个开源库，我下了作者的源代码和例子，但是我却跑不起来。不知道为什么，我又到网上去找使用这个开源库的例子发现有一个，我也下载了下来，发现还是跑不起来。我决定自己好好试试这个源代码，终于在我的努力下现在可以用了。废话完了 现在教大家怎么用这个库。大家不想看怎么做的 可以到后面下载DEMO代码。
1.android-gif-drawable的源代码下载地址：https://github.com/koral--/android-gif-drawable
2.点开它，如下图所示
3.点击下载后，我们可以看到下面这个界面PS:是下载.aar文件我写错了
4.下载好这个文件后，我们右键选择打开方式为
5.然后解压这个文件到一个空的文件夹，复制也可以
6.然后得到如下
7.点开jni文件夹得到如下
8.复制这4个文件夹和开源库的JAR包（classes.jar）到你android代码中位置如下图所示
9.下面是作者教大家的使用方法
PS:想看原版的请到这里来看：https://github.com/koral--/android-gif-drawable
From XML
The simplest way is to useGifImageView(orGifImageButton) like a normalImageView:
<pl.droidsonroids.gif.GifImageViewandroid:layout_width="match_parent"android:layout_height="match_parent"android:src="@drawable/src_anim"android:background="@drawable/bg_anim"/>
If drawables declared byandroid:srcand/orandroid:backgroundare GIF files then they will be automatically recognized asGifDrawables and animated. If given drawable is not a GIF then mentioned Views work like plainImageViewandImageButton.
GifTextViewallows you to use GIFs as compound drawables and background.
<pl.droidsonroids.gif.GifTextViewandroid:layout_width="match_parent"android:layout_height="match_parent"android:drawableTop="@drawable/left_anim"android:drawableStart="@drawable/left_anim"android:background="@drawable/bg_anim"/>
From Java code
GifImageView,GifImageButtonandGifTextViewhave also hooks for setters implemented. So animated GIFs can be set by callingsetImageResource(int resId)andsetBackgroundResource(int resId)
GifDrawablecan be constructed directly from various sources:
//assetfileGifDrawablegifFromAssets=newGifDrawable(getAssets(),"anim.gif");//resource(drawableorraw)GifDrawablegifFromResource=newGifDrawable(getResources(),R.drawable.anim);//bytearraybyte[]rawGifBytes=...GifDrawablegifFromBytes=newGifDrawable(rawGifBytes);//FileDescriptorFileDescriptorfd=newRandomAccessFile("/path/anim.gif","r").getFD();GifDrawablegifFromFd=newGifDrawable(fd);//filepathGifDrawablegifFromPath=newGifDrawable("/path/anim.gif");//fileFilegifFile=newFile(getFilesDir(),"anim.gif");GifDrawablegifFromFile=newGifDrawable(gifFile);//AssetFileDescriptorAssetFileDescriptorafd=getAssets().openFd("anim.gif");GifDrawablegifFromAfd=newGifDrawable(afd);//InputStream(itmustsupportmarking)InputStreamsourceIs=...BufferedInputStreambis=newBufferedInputStream(sourceIs,GIF_LENGTH);GifDrawablegifFromStream=newGifDrawable(bis);//directByteBufferByteBufferrawGifBytes=...GifDrawablegifFromBytes=newGifDrawable(rawGifBytes);
InputStreams are closed automatically in finalizer if GifDrawable is no longer needed so you don't need to explicitly close them. Callingrecycle()will also close underlaying input source.
Note that all input sources need to have ability to rewind to the begining. It is required to correctly play animated GIFs (where animation is repeatable) since subsequent frames are decoded on demand from source.
Animation control
GifDrawableimplements anAnimatableandMediaPlayerControlso you can use its methods and more:
-
stop()- stops the animation, can be called from any thread -
start()- starts the animation, can be called from any thread -
isRunning()- returns whether animation is currently running or not -
reset()- rewinds the animation, does not restart stopped one -
setSpeed(float factor)- sets new animation speed factor, eg. passing 2.0f will double the animation speed -
seekTo(int position)- seeks animation (within current loop) to givenposition(in milliseconds)Only seeking forward is supported -
getDuration()- returns duration of one loop of the animation -
getCurrentPosition()- returns elapsed time from the beginning of a current loop of animation
UsingMediaPlayerControl
Standard controls for a MediaPlayer (like inVideoView) can be used to control GIF animation and show its current progress.
Just setGifDrawableas MediaPlayer on yourMediaControllerlike this:
@OverrideprotectedvoidonCreate(BundlesavedInstanceState){super.onCreate(savedInstanceState);GifImageButtongib=newGifImageButton(this);setContentView(gib);gib.setImageResource(R.drawable.sample);finalMediaControllermc=newMediaController(this);mc.setMediaPlayer((GifDrawable)gib.getDrawable());mc.setAnchorView(gib);gib.setOnClickListener(newOnClickListener(){@OverridepublicvoidonClick(Viewv){mc.show();}});}
Retrieving GIF metadata
-
getLoopCount()- returns a loop count as defined inNETSCAPE 2.0extension -
getNumberOfFrames()- returns number of frames (at least 1) -
getComment()- returns comment text (nullif GIF has no comment) -
getFrameByteCount()- returns minimum number of bytes that can be used to store pixels of the single frame -
getAllocationByteCount()- returns size (in bytes) of the allocated memory used to store pixels of given GifDrawable -
getInputSourceByteCount()- returns length (in bytes) of the backing input data -
toString()- returns human readable information about image size and number of frames (intended for debugging purpose)
10.DEMO下载地址：http://pan.baidu.com/s/1gdd27v1
更多相关文章
- 用git的windows客户端msysgit下载android代码
- android校园二手市场客户端+服务端源代码
- AndroidUnity项目嵌入有米广告注意
- git下载Android源代码（含kernel）
- 关于同步加载和异步加载
- Android(安卓)Resource介绍和使用(一）
- Android数据存储总结 之二
- Android文件系统破坏，导致系统无法启动解决办法
- android studio调用JNI