Bolts

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dependencies {
  compile 'com.parse.bolts:bolts-tasks:1.4.0'
  compile 'com.parse.bolts:bolts-applinks:1.4.0'
}

简介

Bolts是异步执行的第三方库，顺序结构。采用嵌套的方式，往上回调

用法

1定义一个任务

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private Task<Void> uploadImages(final Post post, List<Image> images) {
        Task<Void> ret = Task.forResult(null);
        for (final Image image : images) {
            ret = ret.onSuccessTask(new Continuation<Void, Task<Void>>() {
                @Override
                public Task<Void> then(Task<Void> task) throws Exception {
                    if (post.mPublishingStatus == PublishingStatus.CANCELED) {
                        //取消发布。
                        return Task.forError(new CancelledException());
                    }
                    return uploadImage(image);
                }
            });
        }
        return ret;
    }

2 任务的嵌套
onSuccessTask continueWithTask