Computer scienceMobileAndroidAndroid CoreApplication components

Tasks and back stack

Theory

Match modes

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Match launch modes with their descriptions.

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standard
singleTop
singleTask
singleInstance
Only one instance of the activity can exist at the same time in the stack. If it already exists, all activities placed higher in the stack will be immediately destroyed, revealing the one that has been called.
If the activity is already on top of the stack, the system will route an Intent to that instance through the onNewIntent() method, instead of creating it again.
Even if the same activity exists, it will be created again and pushed on top of the stack.
Activities with this launch mode will always be the only member of the stack.
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