Android 4.0+/Activities Life Cycles

Question

I make easy app for test functions like onCreate(), onStart, etc. Each function make you own log. And start test.

• a) When app is started - onCreate, then onStart and onResume.
• b) When press collapse all window button - onPause and onStop.
• c) When select app from list - onRestart, then onStart and onResume.
• d) When press Back button - onPause, onStop and onDestroy.

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Here's my questions:

1. Why onResume method is called when I execute my app? (in a)
2. Why onPause and onStop methods are called together? (in b)
3. Why in C called three methods instead onRestart, or onResume? (in c)
4. Why onDestroy method is called? (in d)

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P.S.: Sorry for english :)

Answer 1

Here is the Android lifecycle:

You can see the answers to your questions by following the chart.