package com.simplemobiletools.gallery;

public class Constants {
    public static final String DIRECTORY = "directory";
    public static final String MEDIUM = "medium";
    public static final String GET_IMAGE_INTENT = "get_image_intent";
    public static final String GET_VIDEO_INTENT = "get_video_intent";
    public static final String SET_WALLPAPER_INTENT = "set_wallpaper_intent";

    // shared preferences
    public static final String PREFS_KEY = "gallery";
    public static final String IS_FIRST_RUN = "is_first_run";
}

package com.simplemobiletools.gallery;

public class Constants {
    public static final String DIRECTORY = "directory";
    public static final String MEDIUM = "medium";
    public static final String GET_IMAGE_INTENT = "get_image_intent";
    public static final String GET_VIDEO_INTENT = "get_video_intent";
    public static final String SET_WALLPAPER_INTENT = "set_wallpaper_intent";

    // shared preferences
    public static final String PREFS_KEY = "Gallery";
    public static final String IS_FIRST_RUN = "is_first_run";
}

use capital G at shared prefs