SimpleDraweeView图片加载流程-优快云博客

本文详细介绍了Facebook开源库Fresco中SimpleDraweeView组件的setImageURI方法工作原理及内部实现机制，从调用流程到核心代码逐层剖析。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

SimpleDraweeView


  public void setImageURI(Uri uri, @Nullable Object callerContext) {
    DraweeController controller = mSimpleDraweeControllerBuilder
        .setCallerContext(callerContext)
        .setUri(uri)
        .setOldController(getController())
        .build();
    setController(controller);  ---->attachController--->subscribe

AbstractDraweeControllerBuilder



 buildController() {
    AbstractDraweeController controller = obtainController();

PipelineDraweeController


obtainController(){
....
newController(
          obtainDataSourceSupplier(),
          generateUniqueControllerId(),
          getCallerContext());
obtainDataSourceSupplier()

AbstractDraweeControllerBuilder


obtainDataSourceSupplier()
....
getDataSourceSupplierForRequest(imageRequest, /* bitmapCacheOnly */ false);

PipelineDraweeControllerBuilder


  protected DataSource<CloseableReference<CloseableImage>> getDataSourceForRequest(
      ImageRequest imageRequest,
      Object callerContext,
      boolean bitmapCacheOnly) {
    if (bitmapCacheOnly) {
      return mImagePipeline.fetchImageFromBitmapCache(imageRequest, callerContext);
    } else {
      return mImagePipeline.fetchDecodedImage(imageRequest, callerContext);
    }

ImagePipeline


submitFetchRequest

DecodeProducer


produceResults
.....
mJobScheduler.scheduleJob();

fresco研究