java.lang.RuntimeException：在安裝 Apk 時接收廣播 Intent 時出錯

Question

我有一個使用 downloadManager 更新我的應用程序的靜態函數：

 public static void downloadApk(final Context context, String apkurl){
        String destination = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS) + "/";
        String fileName = "apk_update.apk";
        destination += fileName;
        final Uri uri = Uri.parse("file://" + destination);

        //Delete update file if exists
        File file = new File(destination);
        if (file.exists())
            file.delete();

        //set download manager
        DownloadManager.Request request = new DownloadManager.Request(Uri.parse(apkurl));
        request.setDescription("...");
        request.setTitle("...");

        //set destination
        request.setDestinationUri(uri);

        // get download service and enqueue file
        final DownloadManager manager = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);
        final long downloadId = manager.enqueue(request);

        //set BroadcastReceiver to install app when .apk is downloaded
        BroadcastReceiver onComplete = new BroadcastReceiver() {
            public void onReceive(Context ctxt, Intent intent) {
                Intent installIntent = new Intent(Intent.ACTION_VIEW);
                installIntent.setDataAndType(uri, manager.getMimeTypeForDownloadedFile(downloadId));
                installIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
                ctxt.startActivity(installIntent); ////Error on here
                ctxt.unregisterReceiver(this);
               // ctxt.finish();
            }
        };
        //register receiver for when .apk download is compete
        context.registerReceiver(onComplete, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));
    }
}

在線下載完成后出現錯誤：

    ctxt.startActivity(installIntent);

我的錯誤描述：

java.lang.RuntimeException：接收廣播 Intent 時出錯 { act=android.intent.action.DOWNLOAD_COMPLETE flg=0x10 pkg=...

堆棧跟蹤：堆棧跟蹤

Answer 1

manager.getMimeTypeForDownloadedFile(downloadId)

這將返回application/mobile作為 MIME 類型。 這不是有效的 MIME 類型。 據推測， DownloadManager是從您下載此內容的 Web 服務器獲得的。 如果那是您的 Web 服務器，請修復它以對您的內容使用正確的 MIME 類型。