import android.media.MediaScannerConnection.OnScanCompletedListener; //导入依赖的package包/类
@Override
public void onRefresh() {
    if (medias != null) {
        String root = null;
        for (Media media : medias) {
            if (root == null) {
                root = media.getFolderPath();
            } else if (!media.getFolderPath().startsWith(root)) {
                while (root.length() > 1 && !media.getFolderPath().startsWith(root)) {
                    root = ToolString.getParentPath(root);
                }
                if (root.length() <= 1) {
                    break;
                }
            }
        }
        if (root != null) {
            LOG.debug("rescanning " + root);
            MediaScannerConnection.scanFile(getApplicationContext(), new String[]{root}, null, new OnScanCompletedListener() {
                @Override
                public void onScanCompleted(String path, Uri uri) {
                    LOG.debug("file " + path + " was scanned seccessfully: " + uri);
                    load(true);
                }
            });
        } else {
            load(true);
        }
    }
}
 

import android.media.MediaScannerConnection.OnScanCompletedListener; //导入依赖的package包/类
/**
 * @param context
 * @param files
 * @param mimeTypes
 */
public static void scanMediaFiles(final Context context, String[] files, String[] mimeTypes) {
    MediaScannerConnection.scanFile(context, files, mimeTypes, new OnScanCompletedListener() {
        @Override
        public void onScanCompleted(String arg0, Uri arg1) {
            // TODO
        }
    });
}
 

import android.media.MediaScannerConnection.OnScanCompletedListener; //导入依赖的package包/类
public static void scanMedia(Context context, final String[] filePath, final String[] mime) {
	MediaScannerConnection.scanFile(context, filePath, mime, new OnScanCompletedListener() {
		@Override
		public void onScanCompleted(String path, Uri uri) {
			Log.v(DEBUG_TAG, "file " + path + " was scanned seccessfully: " + uri);
		}
	});
}
 

import android.media.MediaScannerConnection.OnScanCompletedListener; //导入依赖的package包/类
public static void scanMediaJpegFile(final Context context, final File file,
        final OnScanCompletedListener listener) {
    MediaScannerConnection
            .scanFile(context, new String[]{file.getAbsolutePath()}, new String[]{"image/jpg"},
                    listener);
}