// FriendConfig.java
public static final int ALIAS = 1;
public static final int MUTE_AND_PIN = 2;
public static final int BACKGROUND = 3;
public static final int BLOCK = 4;
public static final int CLEAR_CHAT_HISTORY = 5;
public static final int DELETE = 6;
public static final int ADD_FRIEND = 7;

@IntDef({ALIAS, MUTE_AND_PIN, BACKGROUND, BLOCK, CLEAR_CHAT_HISTORY, DELETE, ADD_FRIEND})
private @interface Items {}

/**
 * Hide items in contact config interface.
 */
public static void hideItemsInContactConfig(@Items int... items)

// When to call: Before initializing contact setting interface. 
// Valid for contacts.
FriendConfig.hideItemsInContactConfig(FriendConfig.BLOCK, 
                                      FriendConfig.CLEAR_CHAT_HISTORY, 
                                      FriendConfig.DELETE);
// Valid for strange users who have not been added to the contact.
FriendConfig.hideItemsInContactConfig(FriendConfig.ADD_FRIEND);