Change Youtube Thumbnail Image Quality (Your Videos Channel)

//The default thumbnail image :
public static final String YOUTUBE_IMAGE_BACK = "/default.jpg";

//For the high quality version of the thumbnail use a url similar to this:
public static final String YOUTUBE_IMAGE_BACK = "/hqdefault.jpg";

//There is also a medium quality version of the thumbnail, using a url similar to the HQ:
public static final String YOUTUBE_IMAGE_BACK = "/mqdefault.jpg";

//For the standard definition version of the thumbnail, use a url similar to this:
public static final String YOUTUBE_IMAGE_BACK = "/sddefault.jpg";

//For the maximum resolution version of the thumbnail use a url similar to this:
public static final String YOUTUBE_IMAGE_BACK = "/maxresdefault.jpg";