Glide只播放一次Gif以及监听播放完成的实现方案

需求:

近段时间正好有一个需求,是要实现Gif图只加载播放一次,并且要在Gif播放完毕后回调给系统的需求。

因为Glide 3系列的API与4系列还是有很大差距的,这里我们针对Glide 3.x和Glide 4.x的分别进行实现方案的说明。

解决方案:

在Glide3.x的解决方案:

Glide.with(this).load("xxxurl")
                .listener(new RequestListener<Integer, GlideDrawable>() {

                    @Override
                    public boolean onException(Exception arg0, Integer arg1,
                            Target<GlideDrawable> arg2, boolean arg3) {
                        return false;
                    }

                    @Override
                    public boolean onResourceReady(GlideDrawable resource,
                            Integer model, Target<GlideDrawable> target,
                            boolean isFromMemoryCache, boolean isFirstResource) {
                        // 计算动画时长
                        GifDrawable drawable = (GifDrawable) resource;
                        GifDecoder decoder = drawable.getDecoder();
                        for (int i = 0; i < drawable.getFrameCount(); i++) {
                            duration += decoder.getDelay(i);
                        }
                        //发送延时消息,通知动画结束
                        handler.sendEmptyMessageDelayed(MESSAGE_SUCCESS,
                                duration);
                        return false;
                    }
                }) //仅仅加载一次gif动画
                .into(new GlideDrawableImageViewTarget(imageview, 1));

在Glide3.x的解决方案:

在Glide4.x中,我们没法再直接获取GifDecoder对象了,原因是因为GlideDrawable不再提供这个方法了。需要采用反射的方法获取到GifDecoder变量,具体代码如下:

public static void loadOneTimeGif(Context context, Object model, final ImageView imageView, final GifListener gifListener) {
        Glide.with(context).asGif().load(model).listener(new RequestListener<GifDrawable>() {
            @Override
            public boolean onLoadFailed(@Nullable GlideException e, Object model, Target<GifDrawable> target, boolean isFirstResource) {
                return false;
            }

            @Override
            public boolean onResourceReady(GifDrawable resource, Object model, Target<GifDrawable> target, DataSource dataSource, boolean isFirstResource) {
                try {
                    Field gifStateField = GifDrawable.class.getDeclaredField("state");
                    gifStateField.setAccessible(true);
                    Class gifStateClass = Class.forName("com.bumptech.glide.load.resource.gif.GifDrawable$GifState");
                    Field gifFrameLoaderField = gifStateClass.getDeclaredField("frameLoader");
                    gifFrameLoaderField.setAccessible(true);
                    Class gifFrameLoaderClass = Class.forName("com.bumptech.glide.load.resource.gif.GifFrameLoader");
                    Field gifDecoderField = gifFrameLoaderClass.getDeclaredField("gifDecoder");
                    gifDecoderField.setAccessible(true);
                    Class gifDecoderClass = Class.forName("com.bumptech.glide.gifdecoder.GifDecoder");
                    Object gifDecoder = gifDecoderField.get(gifFrameLoaderField.get(gifStateField.get(resource)));
                    Method getDelayMethod = gifDecoderClass.getDeclaredMethod("getDelay", int.class);
                    getDelayMethod.setAccessible(true);
                    //设置只播放一次
                    resource.setLoopCount(1);
                    //获得总帧数
                    int count = resource.getFrameCount();
                    int delay = 0;
                    for (int i = 0; i < count; i++) {
                        //计算每一帧所需要的时间进行累加
                        delay += (int) getDelayMethod.invoke(gifDecoder, i);
                    }
                    imageView.postDelayed(new Runnable() {
                        @Override
                        public void run() {
                            if (gifListener != null) {
                                gifListener.gifPlayComplete();
                            }
                        }
                    }, delay);
                } catch (NoSuchFieldException e) {
                    e.printStackTrace();
                }catch (ClassNotFoundException e) {
                    e.printStackTrace();
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                } catch (NoSuchMethodException e) {
                    e.printStackTrace();
                } catch (InvocationTargetException e) {
                    e.printStackTrace();
                }
                return false;
            }
        }).into(imageView);
    }

    /**
     * Gif播放完毕回调
     */
    public interface GifListener {
        void gifPlayComplete();
    }

同时,因为采用的是反射,所以别忘了proguard-rules.pro中加上Glide的反混淆规则:

#Glide
-keep class com.bumptech.glide.** {*;}

 

posted @ 2019-12-01 07:52  灰色飘零  阅读(...)  评论(...编辑  收藏