android 生命周期四代码
@Override
protectedvoid onResume() {
super.onResume();
System.out.println("onResume!!");
}
@Override
protectedvoid onPause() {
super.onPause();
System.out.println("onPause!!");
}

@Override
protectedvoid onStop() {
super.onStop();
System.out.println("onStop!!");
finish();
// The activity is no longer visible (it is now "stopped")
}
@Override
protectedvoid onDestroy() {
super.onDestroy();
System.out.println("onDestroy!!");
// The activity is about to be destroyed.
}