android開源庫android-gif-drawable的使用

   android的開源庫是用來在android上顯示gif圖片的。我在網上查了一下，大家說這個框架寫的不錯，加載大的gif圖片   不會內存溢出，于是我就想試試這個開源庫，我下了作者的源代碼和例子，但是我卻跑不起來。不知道為什么，我又到網上去找使用這個開源庫的例子發現有一個， 我也下載了下來，發現還是跑不起來。我決定自己好好試試這個源代碼，終于在我的努力下現在可以用了。廢話完了 現在教大家怎么用這個庫。大家不想看怎么做的 可以到后面下載DEMO代碼。

1.android-gif-drawable的源代碼下載地址：https://github.com/koral--/android-gif-drawable

2.點開它，如下圖所示

3.點擊下載后，我們可以看到下面這個界面  PS:是下載.aar文件 我寫錯了

4.下載好這個文件后，我們右鍵選擇打開方式為

5.然后解壓這個文件到一個空的文件夾，復制也可以

6.然后得到如下

7.點開jni文件夾得到如下

8.復制這4個文件夾和開源庫的JAR包（classes.jar）到你android代碼中位置如下圖所示

9.下面是作者教大家的使用方法

PS: 想看原版的   請到這里來看：https://github.com/koral--/android-gif-drawable

From XML

The simplest way is to use GifImageView (or GifImageButton) like a normal ImageView:

<pl.droidsonroids.gif.GifImageView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:src="@drawable/src_anim"
    android:background="@drawable/bg_anim"
    />

If drawables declared by android:src and/or android:background are GIF files then they will be automatically recognized as GifDrawables and animated. If given drawable is not a GIF then mentioned Views work like plainImageView and ImageButton.

GifTextView allows you to use GIFs as compound drawables and background.

<pl.droidsonroids.gif.GifTextView
    android: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, GifImageButton and GifTextView have also hooks for setters implemented. So animated GIFs can be set by calling setImageResource(int resId) and setBackgroundResource(int resId)

GifDrawable can be constructed directly from various sources:

        //asset file
        GifDrawable gifFromAssets = new GifDrawable( getAssets(), "anim.gif" );

        //resource (drawable or raw)
        GifDrawable gifFromResource = new GifDrawable( getResources(), R.drawable.anim );

        //byte array
        byte[] rawGifBytes = ...
        GifDrawable gifFromBytes = new GifDrawable( rawGifBytes );

        //FileDescriptor
        FileDescriptor fd = new RandomAccessFile( "/path/anim.gif", "r" ).getFD();
        GifDrawable gifFromFd = new GifDrawable( fd );

        //file path
        GifDrawable gifFromPath = new GifDrawable( "/path/anim.gif" );

        //file
        File gifFile = new File(getFilesDir(),"anim.gif");
        GifDrawable gifFromFile = new GifDrawable(gifFile);

        //AssetFileDescriptor
        AssetFileDescriptor afd = getAssets().openFd( "anim.gif" );
        GifDrawable gifFromAfd = new GifDrawable( afd );

        //InputStream (it must support marking)
        InputStream sourceIs = ...
        BufferedInputStream bis = new BufferedInputStream( sourceIs, GIF_LENGTH );
        GifDrawable gifFromStream = new GifDrawable( bis );

        //direct ByteBuffer
        ByteBuffer rawGifBytes = ...
        GifDrawable gifFromBytes = new GifDrawable( rawGifBytes );

InputStreams are closed automatically in finalizer if GifDrawable is no longer needed so you don't need to explicitly close them. Calling recycle() 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

GifDrawable implements an Animatable and MediaPlayerControl so 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 given position (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

Using MediaPlayerControl

Standard controls for a MediaPlayer (like in VideoView) can be used to control GIF animation and show its current progress.

Just set GifDrawable as MediaPlayer on your MediaController like this:

    @Override
    protected void onCreate ( Bundle savedInstanceState )
    {
        super.onCreate( savedInstanceState );
        GifImageButton gib = new GifImageButton( this );
        setContentView( gib );
        gib.setImageResource( R.drawable.sample );
        final MediaController mc = new MediaController( this );
        mc.setMediaPlayer( ( GifDrawable ) gib.getDrawable() );
        mc.setAnchorView( gib );
        gib.setOnClickListener( new OnClickListener()
        {
            @Override
            public void onClick ( View v )
            {
                mc.show();
            }
        } );
    }

Retrieving GIF metadata

• getLoopCount() - returns a loop count as defined in NETSCAPE 2.0 extension

• getNumberOfFrames() - returns number of frames (at least 1)

• getComment() - returns comment text (null if 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下載地址：http://pan.baidu.com/s/1gdd27v1

 來自：http://my.oschina.net/u/1175746/blog/288258