主动通知Android系统刷新文件，并对刷新进度做监听

private void refreshFile(String filePath) {
File file = new File(filePath);
MimeTypeMap mtm = MimeTypeMap.getSingleton();
MediaScannerConnection.scanFile(mContext,
new String[] { file.toString() },
new String[] { mtm.getMimeTypeFromExtension(file.toString().substring(file.toString().lastIndexOf(".")+1)) },
new MediaScannerConnection.OnScanCompletedListener() {
@Override
public void onScanCompleted(final String path, final Uri uri) {
Log.d("", "刷新完毕");
}
});
}