Android应用源码之android-gif-drawable 支持fig显示的view.zip

android-gif-drawable ==================== `View`s and `Drawable` for animated GIFs in Android. ## Overview Bundled GIFLib via JNI is used to render frames. This way should be more efficient than `WebView` or `Movie` classes.<br> Animation starts automatically and run only if `View` with attached `GifDrawable` is visible. ## Download **[Latest release downloads](https://github.com/koral--/android-gif-drawable/releases/latest)** ### Setup #### Maven dependency SDK with API level 19 is needed. If you don't have it in your local repository, download [maven-android-sdk-deployer](https://github.com/mosabua/maven-android-sdk-deployer) and install SDK level 19: `mvn install -P 4.4` (from maven-android-sdk-deployer directory). 1. Install artifact to your local repository: `mvn install` 2. Add dependency in `pom.xml` of your project: ```xml <dependency> <groupId>pl.droidsonroids.gif</groupId> <artifactId>android-gif-drawable</artifactId> <version>1.0.4</version> <type>apklib</type> </dependency> ``` #### APKLIB (for non-maven users) 1. Download and unzip APKLIB from **[Latest release downloads](https://github.com/koral--/android-gif-drawable/releases/latest)** 2. Create ANT project or import existing Android code in Eclipse 3. Add newly created library project as a reference in your project ###Requirements + Android 1.6+ (API level 4+) ####Using JAR in Eclipse (NOT recommended, use APKLIB instead) + following option **must be unchecked** Window>Preferences>Android>Build>**Force error when external jars contains native libraries** ####Building from source + [Android NDK](http://developer.android.com/tools/sdk/ndk/index.html) needed to compile native sources ##Usage ###From XML The simplest way is to use `GifImageView` (or `GifImageButton`) like a normal `ImageView`: ```xml <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 `GifDrawable`s 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. ```xml <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: ```java //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` is an `Animatable` 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 ####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) + `toString()` - returns human readable information about image size and number of frames (intended for debugging purpose) ####Advanced + `recycle()` - provided to speed up freeing memory (like in `android.graphics.Bitmap`). + `getError()` - returns last error details ###References This library uses code from [GIFLIB](http://giflib.sourceforge.net/) 5.0.5 and [SKIA](https://code.google.com/p/skia/). ##License MIT License<br> See [LICENSE](LICENSE) file.