Question

我具有以下功能和AsyncTask：

fun downloadBitmapTask(url: String, postExecute: (Drawable) -> Unit) {
    DownloadBitmapTask(0, postExecute).execute(url)
}

class DownloadBitmapTask(private val triesCount: Int, private val postExecute: (Drawable) -> Unit) : AsyncTask<String, Unit, Drawable?>() {
    override fun doInBackground(vararg urls: String): Drawable? {
        val url = urls[0].replaceFirst(Regex("http[^s]"), "https:")
        Log.d("DownloadBitmapTask", "StartedDownload #$triesCount - $url")

        return try {
            val inputStream = URL(url).content as InputStream
            Drawable.createFromStream(inputStream, url)
        } catch (e: Exception) {
            Log.d("DownloadBitmapTask", "${e.message} - $url")
            if(triesCount != 3) {
                Thread.sleep(1000)
                DownloadBitmapTask(triesCount + 1, postExecute ).execute(url)
            }
            null
        } finally {
            Log.d("DownloadBitmapTask", "finished - $url")
        }
    }

    override fun onPostExecute(result: Drawable?) {
        if(result == null)
            Log.d("DownloadBitmapTask", "RESULT NULL")
        result?.let{postExecute.invoke(it)}
    }
}

我希望我的输出看起来像这样：

D/DownloadBitmapTask: StartedDownload #0 - https://www.hotflick.net/flicks/2007_Rush_Hour_3/tn300/007RH3_Oanh_Nguyen_001.jpg
D/DownloadBitmapTask: StartedDownload #0 - https://robocup-mediterranean-open.org/img/276511.png
D/DownloadBitmapTask: StartedDownload #0 - https://i.imgur.com/Te2KxTM.jpg
D/DownloadBitmapTask: StartedDownload #0 - https://vignette.wikia.nocookie.net/spongebob/images/f/f0/Smitty.jpg/revision/latest?cb=20160213220608
D/DownloadBitmapTask: StartedDownload #0 - https://www.dccomics.com/sites/default/files/styles/comics320x485/public/Char_Thumb_Batman_20190116_5c3fc4b40fae42.85141247.jpg?itok=_Or1JrO2
D/DownloadBitmapTask: finished - https://www.hotflick.net/flicks/2007_Rush_Hour_3/tn300/007RH3_Oanh_Nguyen_001.jpg
D/DownloadBitmapTask: finished - https://robocup-mediterranean-open.org/img/276511.png
D/DownloadBitmapTask: finished - https://i.imgur.com/Te2KxTM.jpg
D/DownloadBitmapTask: finished - https://vignette.wikia.nocookie.net/spongebob/images/f/f0/Smitty.jpg/revision/latest?cb=20160213220608
D/DownloadBitmapTask: finished - https://www.dccomics.com/sites/default/files/styles/comics320x485/public/Char_Thumb_Batman_20190116_5c3fc4b40fae42.85141247.jpg?itok=_Or1JrO2

但是它看起来像这样：

D/DownloadBitmapTask: StartedDownload #0 - https://www.hotflick.net/flicks/2007_Rush_Hour_3/tn300/007RH3_Oanh_Nguyen_001.jpg
D/DownloadBitmapTask: finished - https://www.hotflick.net/flicks/2007_Rush_Hour_3/tn300/007RH3_Oanh_Nguyen_001.jpg
D/DownloadBitmapTask: StartedDownload #0 - https://robocup-mediterranean-open.org/img/276511.png
D/DownloadBitmapTask: finished - https://robocup-mediterranean-open.org/img/276511.png
D/DownloadBitmapTask: StartedDownload #0 - https://i.imgur.com/Te2KxTM.jpg
D/DownloadBitmapTask: finished - https://i.imgur.com/Te2KxTM.jpg
D/DownloadBitmapTask: StartedDownload #0 - https://vignette.wikia.nocookie.net/spongebob/images/f/f0/Smitty.jpg/revision/latest?cb=20160213220608
D/DownloadBitmapTask: finished - https://vignette.wikia.nocookie.net/spongebob/images/f/f0/Smitty.jpg/revision/latest?cb=20160213220608
D/DownloadBitmapTask: StartedDownload #0 - https://www.dccomics.com/sites/default/files/styles/comics320x485/public/Char_Thumb_Batman_20190116_5c3fc4b40fae42.85141247.jpg?itok=_Or1JrO2
D/DownloadBitmapTask: finished - https://www.dccomics.com/sites/default/files/styles/comics320x485/public/Char_Thumb_Batman_20190116_5c3fc4b40fae42.85141247.jpg?itok=_Or1JrO2

在我看来，由于某种原因，在这里AsyncTasks并不是真正的Async，但是我不明白为什么。请注意，当我使用executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, url)而不是execute(url)时，也会发生同样的情况。

注意：这仅在使用Pixel 3a时发生。当我使用三星Galaxy S7时，它似乎可以正常工作。

关于这种情况为什么发生以及如何避免的任何想法？

无法从网址异步获取可绘制图片

0 个答案: