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FrescoWrapper

Fresco的封装 方便使用 #作用 (1)提供全局配置占位图和失败占位图的功能。通过application中配置FrescoConfig。
(2)对图片加载进行封装,使得加载本地、url、content图片……更加方便,同时提供加载图片监听。
(3)支持 xml中对SimpleDraweeView的宽高wrap_content进行兼容。 #How to use (1) in gradle

    compile 'com.facebook.fresco:fresco:0.12.0'
    // 支持 GIF 动图,需要添加
    compile 'com.facebook.fresco:animated-gif:0.12.0'
    // 支持 WebP (静态图+动图),需要添加
    compile 'com.facebook.fresco:animated-webp:0.12.0'
    compile 'com.facebook.fresco:webpsupport:0.12.0'

(2) in application
application中进行初始化

 FrescoConfig frescoConfig = FrescoConfigBuilder.newInstance().setDiskDirName("FrescoDefault").setSmallDiskDirName
                ("FrescoSmall").setPlaceholder(ContextCompat.getDrawable(this, R.drawable
                .icon_default)).setFailImage(ContextCompat.getDrawable(this, R.drawable
                .icon_default)).build();
        FrescoLoader.getInstance().init(this, frescoConfig);

(3)加载图片

    //按照xml里simpleDraweeView的配置方式从网络加载图片,图片不可信赖,会按照View的宽高进行resize,异步加载
    FrescoLoader.getInstance().loadImageFromWeb(simpleDraweeView,url,listener);
    //按照xml里simpleDraweeView的配置方式从ContentResolver加载图片,资源不可信赖,会按照View的宽高进行resize,异步加载
    FrescoLoader.getInstance().loadImageFromContent(simpleDraweeView,url,listener);
    //按照xml里simpleDraweeView的配置方式从assets加载图片,该资源一般是可信赖的,这里不会进行resize,异步加载
    FrescoLoader.getInstance().loadImageFromAsset(simpleDraweeView,url,listener);
    //加载本地图片   url:无需包含file://前缀,只需要文件的绝对路径,类似/mnt/sdcard/xxx
    FrescoLoader.getInstance().loadImageFromLocalFile(simpleDraweeView,url,listener);
    //加载本地资源图片
    FrescoLoader.getInstance().loadImageFromResource(simpleDraweeView,resId,listener);
    //网络加载图片  并对图片置灰
    FrescoLoader.getInstance().loadGrayImageFromWeb(simpleDraweeView,url,listener);

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