Android生命周期注意事项
onCreate (Bundle savedInstanceState)
finish()
from within this function, in which case onDestroy() will be immediately called without any of the rest of the activity lifecycle (onStart()
, onResume()
, onPause()
, etc) executing.onResume ()
onRestoreInstanceState(Bundle)
, onRestart()
, or onPause()
, for your activity to start interacting with the user. This is a good place to begin animations, open exclusive-access devices (such as the camera), etc.onWindowFocusChanged(boolean)
to know for certain that your activity is visible to the user (for example, to resume a game).MainActivity onStart
MainActivity onResume
MainActivity onWindowFocusChanged hasFocus=true
MainActivity onPause
MainActivity onStop
MainActivity onDestroy
onPause ()
Called as part of the activity lifecycle when an activity is going into the background, but has not (yet) been killed.
When activity B is launched in front of activity A, this callback will be invoked on A. B will not be created until A's onPause()
returns, so be sure to not do anything lengthy here.
当Activity要进入后台时触发此方法,但是还没有被杀。
onStop()
(after the next activity has been resumed and displayed), however in some cases there will be a direct call back to onResume()
without going through the stopped state.onStop ()
Note that this method may never be called, in low memory situations where the system does not have enough memory to keep your activity's process running after its onPause()
method is called.
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