DownloadManager java.lang.IllegalArgumentException

Question

一个用户发给我以下错误:

java.lang.IllegalArgumentException: Unknown URL content://downloads/my_downloads
at android.content.ContentResolver.insert(ContentResolver.java:860)
at android.app.DownloadManager.enqueue(DownloadManager.java:904)
at 

，即使我使用以下代码:

ApplicationInfo ai = null;//Check if download manager is enabled
        try {
            ai = this.getPackageManager().getApplicationInfo("com.android.providers.downloads",0);
        } catch (NameNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
         appStatus = ai.enabled;

当用户试图下载

                if(appStatus=false){
                        //  Download manager not available.....
                    }           
                    else {
    //filename=String
    String fileName=URLUtil.guessFileName(url,contentDisposition,mimetype); 
request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, fileName);
                    request.setDescription(fileName);      
                    manager.enqueue(request); 
                    }

我做错了什么?

Answer 1

原因很简单:下载管理器被用户"停用"了。你可以这样做:进入设置>应用程序>所有应用程序，选择"下载管理器"，然后点击"禁用"。

我在代码中检查它，像这样

    try {
        download.downloadManagerId = systemDownloadManager.enqueue(request)
        download.state = DownloadState.DOWNLOADING
    } catch (e:IllegalArgumentException) {
        result.state = DownloadMagerResult.STATE.NOMANAGER
        return result
    }