Will someone please explain RESULT_FIRST_USER

Question

I don\'t understand the meaning, value, or importance of RESULT_FIRST_USER, other than that my own result codes must be greater than 1. Will someone please expl

Answer 1

An activity result is a 32-bit integer. The possible values are divided into three ranges:

• -2 and below: Unused.
• -1 and 0: System-defined values. That is, activity results defined by Android.
• 1 and above: User-defined values. That is, activity results defined by app developers.

RESULT_FIRST_USER identifies the first value in the user-defined range. The following sample definitions show how system- and user-defined values fit together:

public static final int RESULT_OK = -1; // Defined by Android. You don't write this code.
public static final int RESULT_CANCELED = 0; // Defined by Android. You don't write this code.
public static final int RESULT_ENDED_GAME = RESULT_FIRST_USER + 0; // Defined by an app.
public static final int RESULT_ACTIVATED_RADAR = RESULT_FIRST_USER + 1; // Defined by an app.
public static final int RESULT_LAUNCHED_ROCKETS = RESULT_FIRST_USER + 2; // Defined by an app.