Life cycle of activity

1. The life cycle under normal circumstances

• When the Activity is onStop or onPause, If the memory is not enough , it will be killed by the system and then re- onCreate

• When the activity is on Stop , if the user navigates back to the activity, the on Start method is called

• onPause and onStop can not do too heavy recycling work

2. life cycle in exceptional circumstances

　　

• Resource-related configuration changes cause Activity to be killed and recreated

  • activity window to save data window Then entrust him with the top container to save the data top container is generally a Viewgroup, In general it may be decorview, The last top-level container notifies its child elements to hold the data

  • do not want the system resource configuration to be To kill activityactivityconfigchange properties

• Insufficient system resources lead to being killed
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    Priority order : foreground activity > visible but not foreground activty > background activity

Life cycle of activity