使用 Picasso 获取带位图的回调 [英] Use Picasso to get a callback with a Bitmap

问题描述

我正在使用 Picasso 为我的应用下载图像.

I'm using Picasso to download images for my app.

我需要先访问 Bitmap，然后再将其加载到 ImageView.Downloader.Response 类的存在似乎表明这是可能的，但我找不到任何使用示例.如果可以使用 Picasso，我不想编写更多代码来异步处理这个特殊情况.

I'm in a situation where I need to access the Bitmap first before it's loaded into the ImageView. The presence of the Downloader.Response class seems to suggest this is possible, but I can't find any use examples. I don't want to write a bunch more code to asynchronously handle this one particular case if it's possible to do with Picasso.

谁能告诉我怎么做?

推荐答案

在 github 上找到答案，以防有人疑惑:

Found the answer on github in case anyone is wondering:

private Target target = new Target() {
      @Override
      public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
      }

      @Override
      public void onBitmapFailed(Drawable errorDrawable) {
      }

      @Override
      public void onPrepareLoad(Drawable placeHolderDrawable) {
      }
}

private void someMethod() {
   Picasso.with(this).load("url").into(target);
}

@Override 
public void onDestroy() {  // could be in onPause or onStop
   Picasso.with(this).cancelRequest(target);
   super.onDestroy();
}

该帖子建议不要使用匿名回调，而是为目标使用实例变量.

The post recommends not using an anonymous callback, and instead using an instance variable for target.

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