Yours is a normal phenomenon of starting a new Activity every time, because it is destroyed every time you go back. As for you saying that there is no startup animation for other people’s second login (is it the startup animation of the Activity or is it customized? An animation?), the current guess is that the startup mode uses singleInstanse, and then it is not destroyed when the return button is clicked, but moveTaskToBack, and then the existing Activity is opened when it is started again. At this time, the life cycle only goes onResume, as described It’s too vague, I’ll give you a rough guess
Check whether the return key event calls finish() or System.exit(0); If finish() is called, then when you click the app's desktop icon again, it will restart. process, the opening animation will be displayed again
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Yours is a normal phenomenon of starting a new Activity every time, because it is destroyed every time you go back. As for you saying that there is no startup animation for other people’s second login (is it the startup animation of the Activity or is it customized? An animation?), the current guess is that the startup mode uses singleInstanse, and then it is not destroyed when the return button is clicked, but moveTaskToBack, and then the existing Activity is opened when it is started again. At this time, the life cycle only goes onResume, as described It’s too vague, I’ll give you a rough guess
Check whether the return key event calls finish() or System.exit(0);
If finish() is called, then when you click the app's desktop icon again, it will restart. process, the opening animation will be displayed again
Call moveTaskToBack(true) when onBackPressed, which is equivalent to pressing the Home button without closing the Activity