您可以手动触发给定路径的媒体扫描器.这将反映变化.这是android的代码

you can trigger media scanner manually for given path. which will reflect the changes. here is the code for android

    android.content.Intent mediaScanIntent = new android.content.Intent(android.content.Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
    android.net.Uri contentUri = android.net.Uri.fromFile(imageFile);
    mediaScanIntent.setData(contentUri);
    application.android.context.sendBroadcast(mediaScanIntent);

或者你也可以在下面做

    android.media.MediaScannerConnection.scanFile(application.android.context, [picturePath], null, callback);