class App : Application(){
lateinit var app: Application
override fun onCreate() {
super.onCreate()
app = this
registerActivityLifecycleCallbacks(lifeImp)
}
inner class LifeCycleImp : ActivityLifecycleCallbacks {
var foregroundActivities = 0
var isChangingConfiguration = false
override fun onActivityPaused(activity: Activity) {
}
override fun onActivityCreated(activity: Activity, savedInstanceState: Bundle?) {
if (savedInstanceState != null) {
//若bundle不为空则程序异常结束重启整个程序
val intent = Intent(activity, MainActivity::class.java)
intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
app.startActivity(intent)
}
}
override fun onActivityStarted(activity: Activity) {
foregroundActivities++
if (foregroundActivities == 1 && !isChangingConfiguration) {
Log.i("JOKER", "应用切换到前台")
}
isChangingConfiguration = false;
}
override fun onActivityDestroyed(activity: Activity) {
}
override fun onActivitySaveInstanceState(activity: Activity, outState: Bundle) {
}
override fun onActivityStopped(activity: Activity) {
foregroundActivities--
if (foregroundActivities == 0) {
Log.i("JOKER", "应用切换到后台")
}
isChangingConfiguration = activity.isChangingConfigurations;
}
override fun onActivityResumed(activity: Activity) {
}
}
}
``安卓App前后台切换基本判断
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