How to use MediaScannerConnection.

sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://" 
     + Environment.getExternalStorageDirectory())));  


 Do not do the sendBroadcast if you only want one image to appear in the gallery. That'd be a huge waste of resources. You'll need to make a MediaScannerConnectionClient and then call connect() on the MediaScannerConnection you make from it to scan the file. Here's an example:

private MediaScannerConnectionClient _mediaScanConnectionClient =  
    new MediaScannerConnectionClient() { 
 
    public void onMediaScannerConnected() { 
        MEDIA_SCANNER_CONNECTION.scanFile("pathToImage/someImage.jpg", null); 
    } 
 
    public void onScanCompleted(String path, Uri uri) { 
        if(path.equals("pathToImage/someImage.jpg")) 
            MEDIA_SCANNER_CONNECTION.disconnect(); 
    } 

}; 

new MediaScannerConnection(context, _mediaScanConnectionClient).connect();