Fresco使用之OOM问题记录

最近友盟上5.0以上系统报出很多OOM异常，看下日志看到facebook的时候就知道一定是Fresco使用不当导致了OOM。

 java.lang.OutOfMemoryError: Failed to allocate a  byte allocation with  free bytes and 1426KB until OOM
     at dalvik.system.VMRuntime.newNonMovableArray(Native Method)
     at android.graphics.Bitmap.nativeCreate(Native Method)
     at android.graphics.Bitmap.createBitmap(Bitmap.java:)
     at android.graphics.Bitmap.createBitmap(Bitmap.java:)
     at android.graphics.Bitmap.createBitmap(Bitmap.java:)
     at com.facebook.imagepipeline.memory.BitmapPool.alloc(BitmapPool.java:)
     at com.facebook.imagepipeline.memory.BitmapPool.alloc(BitmapPool.java:)
     at com.facebook.imagepipeline.memory.BasePool.get(BasePool.java:)

查资料原来5.0以上Fresco内存会持续增长，所以重新配置了Fresco

         //设置内存紧张时的应对措施
         MemoryTrimmableRegistry memoryTrimmableRegistry = NoOpMemoryTrimmableRegistry.getInstance();
         memoryTrimmableRegistry.registerMemoryTrimmable(new MemoryTrimmable() {
             @Override
             public void trim(MemoryTrimType trimType) {
                 final double suggestedTrimRatio = trimType.getSuggestedTrimRatio();

                 if (MemoryTrimType.OnCloseToDalvikHeapLimit.getSuggestedTrimRatio() == suggestedTrimRatio
                         || MemoryTrimType.OnSystemLowMemoryWhileAppInBackground.getSuggestedTrimRatio() == suggestedTrimRatio
                         || MemoryTrimType.OnSystemLowMemoryWhileAppInForeground.getSuggestedTrimRatio() == suggestedTrimRatio) {
                     //清空内存缓存
                     ImagePipelineFactory.getInstance().getImagePipeline().clearMemoryCaches();
                 }
             }
         });
         //设置磁盘缓存
         imagePipelineConfigBuilder.setMainDiskCacheConfig(DiskCacheConfig.newBuilder(this)
                 .setBaseDirectoryPath(getExternalCacheDir())//设置磁盘缓存的路径
                 .setBaseDirectoryName(getString(R.string.app_name))//设置磁盘缓存文件夹的名称
                 .setMaxCacheSize(20 * ByteConstants.MB)//设置磁盘缓存的大小
                 .build())
                 .setDownsampleEnabled(true)
                 .setMemoryTrimmableRegistry(memoryTrimmableRegistry);

另外，加载一些大图需要根据View的尺寸缩放图片 (ResizeOptions)

     /**
      * 构建、获取ImageRequest
      * @param uri 加载路径
      * @param simpleDraweeView 加载的图片控件
      */
     public ImageRequest getImageRequest(Uri uri, SimpleDraweeView simpleDraweeView) {
         int width;
         int height;
         if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) {
             width = simpleDraweeView.getWidth();
             height = simpleDraweeView.getHeight();
         } else {
             width = simpleDraweeView.getMaxWidth();
             height = simpleDraweeView.getMaxHeight();
         }

         //根据请求路径生成ImageRequest的构造者
         ImageRequestBuilder builder = ImageRequestBuilder.newBuilderWithSource(uri);
         //调整解码图片的大小
         if (width > 0 && height > 0) {
             builder.setResizeOptions(new ResizeOptions(width, height));
         }
         //设置是否开启渐进式加载，仅支持JPEG图片
         builder.setProgressiveRenderingEnabled(true);
         return builder.build();
     }

目前想到的从这两方面避免OOM，结果还是要看友盟的统计~

BY LiYing