package com.blogspot.nagabhushan;

public final class ParseConstants {
	// Class name
	public static final String CLASS_MESSAGES = "Messages";
	
	// Field names
	public static final String KEY_USER_ID = "userId";
	public static final String KEY_USERNAME = "username";
	public static final String KEY_FRIENDS_RELATION = "friendsRelation";
	public static final String KEY_RECIPIENT_IDS = "recipientIds";
	public static final String KEY_SENDER_ID = "senderId";
	public static final String KEY_SENDER_NAME = "senderName";
	public static final String KEY_FILE = "file";
	public static final String KEY_FILE_TYPE = "fileType";
	public static final String KEY_CREATED_AT = "createdAt";
	
	public static final String TYPE_IMAGE = "image";
	public static final String TYPE_VIDEO = "video";
}

package com.blogspot.nagabhushan;

public final class ParseConstants {
	// Class name
	public static final String CLASS_MESSAGES = "Messages";
	
	// Field names
	// The names are mainly related to the Parse Object keys
	public static final String KEY_USER_ID = "userId";
	public static final String KEY_USERNAME = "username";
	public static final String KEY_FRIENDS_RELATION = "friendsRelation";
	public static final String KEY_RECIPIENT_IDS = "recipientIds";
	public static final String KEY_SENDER_ID = "senderId";
	public static final String KEY_SENDER_NAME = "senderName";
	public static final String KEY_FILE = "file";
	public static final String KEY_FILE_TYPE = "fileType";
	public static final String KEY_CREATED_AT = "createdAt";
	
	public static final String TYPE_IMAGE = "image";
	public static final String TYPE_VIDEO = "video";
}

Update ParseConstants.java