Views and Drawable for animated GIFs in Android.

Bundled GIFLib via JNI is used to render frames. This way should be more efficient than WebView or Movie classes.

Insert the following dependency to build.gradle file of your project.

dependencies {
    compile 'pl.droidsonroids.gif:android-gif-drawable:1.1.+'
}

Note that Maven central repository should be defined eg. in top-level build.gradle like this:

buildscript {
    repositories {
        mavenCentral()
    }
}
allprojects {
    repositories {
        mavenCentral()
    }
}

<dependency>
	<groupId>pl.droidsonroids.gif</groupId>
	<artifactId>android-gif-drawable</artifactId>
	<version>insert latest version here</version>
	<type>aar</type>
</dependency>

See Sample eclipse project with setup instructions.

Latest release downloads

###Requirements

• Android 2.2+ (API level 8+)
• for GifTextureView Android 4.0+ (API level 14+) and hardware-accelerated rendering

####Building from source

• Android NDK needed to compile native sources

##Usage

###Sample project Sample project is under construction. Not all features are covered yet.

###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 plain ImageView 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)

####Associating single GifDrawable instance with multiple Views

Normally single GifDrawable instance associated with multiple Views will animate only on the last one. To solve that create MultiCallback instance, add Views to it and set callback for given drawable, eg.:

	MultiCallback multiCallback = new MultiCallback();

    imageView.setImageDrawable(gifDrawable);
    multiCallback.addView(imageView);

    anotherImageView.setImageDrawable(gifDrawable);
    multiCallback.addView(anotherImageView);

    gifDrawable.setCallback(multiCallback);

####Advanced

• recycle() - provided to speed up freeing memory (like in android.graphics.Bitmap)
• isRecycled() - checks whether drawable is recycled
• getError() - returns last error details

##Upgrading from 1.1.9 int parameter loopNumber has been added to AnimationListener#onAnimationCompleted().

##Upgrading from 1.1.8 ####Proguard configuration not needed Proguard configuration is now bundled with the library, you don't need to specify it yourself.

##Upgrading from 1.1.3 src XML attribute in GifTextureView has been renamed to gifSource to avoid possible conflicts with other libraries

##Upgrading from 1.0.x ####Proguard configuration update Proguard configuration has changed to:

-keep public class pl.droidsonroids.gif.GifIOException{<init>(int);}
-keep class pl.droidsonroids.gif.GifInfoHandle{<init>(long,int,int,int);}

####Drawable recycling behavior change GifDrawable now uses android.graphics.Bitmap as frame buffer. Trying to access pixels (including drawing) of recycled GifDrawable will cause IllegalStateException like in Bitmap.

####Minimum SDK version changed Minimum API level is now 8 (Android 2.2).

####Rendering moved to background thread Rendering is performed in background thread running independently from main thread so animation is running even if drawable is not drawn. However rendering is not running if drawable is not visible, see [#setVisible()](http://developer.android.com/reference/android/graphics/drawable/Drawable.html#setVisible(boolean, boolean)). That method can be used to control drawable visibility in cases when it is not already handled by Android framework.

##References This library uses code from GIFLib 5.1.1 and SKIA.

##License

MIT License
See LICENSE file.