(4.2.28)项目中使用的gif开源组件----android-gif-drawable
2016-06-04 16:47
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前言:
GifView:已知bug : 如果图档过大,会出现OOM为了解决图档太大时的OOM,我想把gif解析时的图片先存入到文件中,在显示时直接从文件中读入,但这样的话,显示的效果不好。
android-gif-drawable并没有此问题,底层解码使用C实现,极大的提高了解码效率,同时很大程度上避免了OOM现象出现。
作者:ant.cy.liao
主页: http://code.google.com/p/gifview/
下载: http://code.google.com/p/gifview/downloads/list
简介:android中现在没有直接显示gif的view,只能通过mediaplay来显示,且还常常不能正常显示出来,为此写了这个gifview,其用法和imageview一样
使用方法:
1-把GifView.jar加入你的项目。
2-在xml中配置GifView的基本属性,GifView继承自View类,和Button、ImageView一样是一个UI控件。如:
3-在代码中配置常用属性:
GifView的Jar包共有四个类:
GifAction.java:
观察者类,监视GIF是否加载成功
GifFrame.java
里面三个成员:当前图片、延时、下张Frame的链接。
GifDecoder.java
http://code.google.com/p/gifview/source/browse/trunk/src/com/ant/liao/GifDecoder.java
GifView.java
主类,包括常用方法,如GifView构造方法、设置图片源、延迟、绘制等。
http://code.google.com/p/gifview/source/browse/trunk/src/com/ant/liao/GifView.java
Android开源项目:android-gif-drawable——Android显示GIF动画
animated GIFs in Android.
项目地址: https://github.com/koral--/android-gif-drawable
Bundled GIFLib via JNI is used to render frames. This way should be more efficient than
Animation starts automatically and run only if
visible.
Latest
release downloads
Insert the following dependency to
Note that Maven central repository should be defined eg. in top-level
SDK with API level 19 is needed. If you don't have it in your local repository, download maven-android-sdk-deployer and
install SDK level 19:
dependency in
Android 1.6+ (API level 4+)
Android
NDK needed to compile native sources
The simplest way is to use
like a normal
If drawables declared by
GIF files then they will be automatically recognized as
drawable is not a GIF then mentioned Views work like plain
also hooks for setters implemented. So animated GIFs can be set by calling
InputStreams are closed automatically in finalizer if GifDrawable is no longer needed so you don't need to explicitly close them. Calling
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.
you can use its methods and more:
from any thread
from any thread
currently running or not
restart stopped one
speed factor, eg. passing 2.0f will double the animation speed
current loop) to given
of the animation
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
this:
defined in
(at least 1)
GIF has no comment)
of bytes that can be used to store pixels of the single frame
bytes) of the allocated memory used to store pixels of given GifDrawable
(in bytes) of the backing input data
about image size and number of frames (intended for debugging purpose)
memory (like in
This library uses code from GIFLIB 5.0.5
and SKIA .
GifView:已知bug : 如果图档过大,会出现OOM为了解决图档太大时的OOM,我想把gif解析时的图片先存入到文件中,在显示时直接从文件中读入,但这样的话,显示的效果不好。
android-gif-drawable并没有此问题,底层解码使用C实现,极大的提高了解码效率,同时很大程度上避免了OOM现象出现。
GifView——Android显示GIF动画
作者:ant.cy.liao主页: http://code.google.com/p/gifview/
下载: http://code.google.com/p/gifview/downloads/list
简介:android中现在没有直接显示gif的view,只能通过mediaplay来显示,且还常常不能正常显示出来,为此写了这个gifview,其用法和imageview一样
使用方法:
1-把GifView.jar加入你的项目。
2-在xml中配置GifView的基本属性,GifView继承自View类,和Button、ImageView一样是一个UI控件。如:
<com.ant.liao.GifView android:id="@+id/gif2" android:layout_height="wrap_content" android:layout_width="wrap_content" android:paddingTop="4px" android:paddingLeft="14px" android:enabled="false" />
3-在代码中配置常用属性:
// 从xml中得到GifView的句柄 gf1 = (GifView) findViewById(R.id.gif1); // 设置Gif图片源 gf1.setGifImage(R.drawable.gif1); // 添加监听器 gf1.setOnClickListener(this); // 设置显示的大小,拉伸或者压缩 gf1.setShowDimension(300, 300); // 设置加载方式:先加载后显示、边加载边显示、只显示第一帧再显示 gf1.setGifImageType(GifImageType.COVER);
GifView的Jar包共有四个类:
GifAction.java:
观察者类,监视GIF是否加载成功
package com.ant.liao; public interface GifAction { /** *gif解码观察者 * @hide * @param parseStatus 解码是否成功,成功会为true * @param frameIndex 当前解码的第几帧,当全部解码成功后,这里为-1 */ public void parseOk(boolean parseStatus,int frameIndex); }
GifFrame.java
里面三个成员:当前图片、延时、下张Frame的链接。
package com.ant.liao; import android.graphics.Bitmap; public class GifFrame { /** * 构造函数 * @param im 图片 * @param del 延时 */ public GifFrame(Bitmap im, int del) { image = im; delay = del; } public GifFrame(String name,int del){ imageName = name; delay = del; } /**图片*/ public Bitmap image; /**延时*/ public int delay; /**当图片存成文件时的文件名*/ public String imageName = null; /**下一帧*/ public GifFrame nextFrame = null; }
GifDecoder.java
http://code.google.com/p/gifview/source/browse/trunk/src/com/ant/liao/GifDecoder.java
GifView.java
主类,包括常用方法,如GifView构造方法、设置图片源、延迟、绘制等。
http://code.google.com/p/gifview/source/browse/trunk/src/com/ant/liao/GifView.java
Android开源项目:android-gif-drawable——Android显示GIF动画
android-gif-drawable
Views and
Drawablefor
animated GIFs in Android.
项目地址: https://github.com/koral--/android-gif-drawable
Bundled GIFLib via JNI is used to render frames. This way should be more efficient than
WebViewor
Movieclasses.
Animation starts automatically and run only if
Viewwith attached
GifDrawableis
visible.
Latest
release downloads
Gradle (Android Studio)
Insert the following dependency to build.gradlefile of your project.
dependencies { compile 'pl.droidsonroids.gif:android-gif-drawable:1.0.+' }
Note that Maven central repository should be defined eg. in top-level
build.gradlelike this:
buildscript { repositories { mavenCentral() } } allprojects { repositories { mavenCentral() } }
SDK with API level 19 is needed. If you don't have it in your local repository, download maven-android-sdk-deployer and
install SDK level 19:
mvn install -P 4.4(from maven-android-sdk-deployer directory). Then add
dependency in
pom.xmlof your project:
<dependency> <groupId>pl.droidsonroids.gif</groupId> <artifactId>android-gif-drawable</artifactId> <version>insert latest version here</version> <type>aar</type> </dependency>
Android 1.6+ (API level 4+)
Building from source
AndroidNDK needed to compile native sources
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:srcand/or
android:backgroundare
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
ImageViewand
ImageButton.
GifTextViewallows 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" />
GifImageView,
GifImageButtonand
GifTextViewhave
also hooks for setters implemented. So animated GIFs can be set by calling
setImageResource(int resId)and
setBackgroundResource(int resId)
GifDrawablecan 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
GifDrawableimplements an
Animatableand
MediaPlayerControlso
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
GifDrawableas 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 2.0extension
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)
recycle()- provided to speed up freeing
memory (like in
android.graphics.Bitmap).
getError()- returns last error details
This library uses code from GIFLIB 5.0.5
and SKIA .
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