java.lang.RuntimeException：接收广播意图错误安装Apk

Question

我有一个用于更新我的应用程序的静态函数，使用downloadManager：

 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));
    }
}

下载完成在线完成后出错：

    ctxt.startActivity(installIntent);

我的错误描述：

java.lang.RuntimeException：接收广播Intent时出错{act = android.intent.action.DOWNLOAD_COMPLETE flg = 0x10 pkg = ...

堆栈跟踪：stack trace

Answer 1

manager.getMimeTypeForDownloadedFile(downloadId)

这将返回application/mobile作为MIME类型。这不是有效的MIME类型。据推测，DownloadManager从您下载此内容的Web服务器获得了此信息。如果这是您的Web服务器，请修复它以使用适合您的内容的MIME类型。