Cannot trust current state of AAC lifecycle

Question

Issue summary

getLifecycle().getCurrentState() gave me wrong state.

Environment (integrated library, OS, etc)

• compileSdkVersion : 27
• targetSdkVersion : 27
• support library : 27.1.1

Expected behavior

• onCreate() -> CREATED
• onStart() -> STARTED
• onResume() -> RESUMED
• onPause() -> STARTED
• onStop() -> CREATED
• onDestroy() -> DESTROYED

Actual behavior

• onCreate : INITIALIZED
• onStart : CREATED
• onResume : STARTED
• onPause : STARTED
• onStop : CREATED
• onDestroy : DESTROYED

Issue detail

I tried using below code. I searched google but no one thinks strangely about this. Am I something missing?

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        Log.i(MainActivity::class.java.name, "onCreate : " + lifecycle.currentState.name)
    }

    override fun onStart() {
        super.onStart()
        Log.i(MainActivity::class.java.name, "onStart : " + lifecycle.currentState.name)
    }

    override fun onResume() {
        super.onResume()
        Log.i(MainActivity::class.java.name, "onResume : " + lifecycle.currentState.name)
    }

    override fun onPause() {
        super.onPause()
        Log.i(MainActivity::class.java.name, "onPause : " + lifecycle.currentState.name)
    }

    override fun onStop() {
        super.onStop()
        Log.i(MainActivity::class.java.name, "onStop : " + lifecycle.currentState.name)
    }

    override fun onDestroy() {
        super.onDestroy()
        Log.i(MainActivity::class.java.name, "onDestroy : " + lifecycle.currentState.name)
    }
}

Answer 1

Your actual behaviour is the expected behaviour if you look at the documentation: https://developer.android.com/topic/libraries/architecture/lifecycle

Think of the states as nodes of a graph and events as the edges between these nodes.