Android difference between handler.postAtTime and handler.postDelayed

Question

Please tell me the difference between handler.postAtTime and handler.postDelayed in android.And also, please tell me when to use handler.postAtTime and when to use handler.postDelayed.

Answer 1

From the documentation:

For postAtTime :

public final boolean postAtTime (Runnable r, long uptimeMillis)
...
uptimeMillis absolute time at which the callback should be executed using the uptimeMillis () time base. ...

And for postDelayed :

public final boolean postDelayed (Runnable r, long delayMillis)
...
delayMillis Delay (in milliseconds) until Runnable is executed. ...

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If this is not clear yet, postDelayed() run something after X milliseconds from the current time. So far, postAtTime() launching something at the specified time XX:YY:ZZ.mmm .