android - java.lang.NoSuchMethodError : android. app.DownloadManager$Request.setNotificationVisibility 错误

Question

尝试使用 DownloadManager像这样

DownloadManager.Request request = new DownloadManager.Request(uri)
            .setAllowedNetworkTypes(DownloadManager.Request.NETWORK_MOBILE)
            .setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI)
            .setAllowedOverRoaming(true)
            .setDestinationInExternalFilesDir(this, null,String.valueOf(mPathAndFolder))
            .setVisibleInDownloadsUi(false)
            .setNotificationVisibility(DownloadManager.Request.VISIBILITY_HIDDEN);


long downloadID = downloadManager.enqueue(request);

在Android Manifest中添加了以下权限

<uses-permission android:name="android.permission.DOWNLOAD_WITHOUT_NOTIFICATION"/>

运行时出现如下错误

java.lang.NoSuchMethodError: android.app.DownloadManager$Request.setNotificationVisibility

为什么会出现这个错误？如何使 DownloadManager 工作？

Answer 1

Do I need to use two separate DownloadManager.Request one for API 9 and another for API 11?

不，但是您确实需要使用 Java 保护 block :

DownloadManager.Request request = new DownloadManager.Request(uri)
        .setAllowedNetworkTypes(DownloadManager.Request.NETWORK_MOBILE)
        .setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI)
        .setAllowedOverRoaming(true)
        .setDestinationInExternalFilesDir(this, null,String.valueOf(mPathAndFolder))
        .setVisibleInDownloadsUi(false);

if (Build.VERSION.SDK_INT>=Build.VERSION_CODES.HONEYCOMB) {
        request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_HIDDEN);
}

而且，您将不得不接受这样一个事实，即您的下载对于 API 级别 9 和 10 的设备是可见的。