Two typical methods for exiting multiple activities in Android

Here we will introduce two methods: one is to remember each activity and then kill them one by one; the other is to use broadcast.

Method 1: Use List to save activity instances, and then kill them one by one.

UpperCode:

 Import  Java. util. Collections list;  Import  Java. util. List;  Import  Android. App. activity;  Import  Android. App. alertdialog;  Import  Android. App. Application;  Import  Android. content. dialoginterface; Import  Android. content. intent;  Public   Class Sysapplication Extends  Application {  Private List <activity> MList = New History List <activity> ();  Private   Static  Sysapplication instance;  Private  Sysapplication (){} Public   Synchronized   Static  Sysapplication getinstance (){  If ( Null = Instance) {instance = New  Sysapplication ();}  Return  Instance ;}  //  Add Activity  Public   Void Addactivity (activity) {MList. Add (activity );}  Public   Void  Exit (){  Try  {  For  (Activity: MList ){  If (Activity! = Null  ) Activity. Finish ();}}  Catch  (Exception e) {e. printstacktrace ();} Finally  {System. Exit ( 0 ) ;}}@ Override  Public   Void  Onlowmemory (){  Super  . Onlowmemory (); system. GC () ;}} added similar code in the oncreate method of each activity: [Java]  Public   Void  Oncreate (bundle savedinstancestate ){  Super  . Oncreate (savedinstancestate); sysapplication. getinstance (). addactivity ( This  );}  Public   Void  Oncreate (bundle savedinstancestate ){  Super  . Oncreate (savedinstancestate); sysapplication. getinstance (). addactivity (  This  );} Exit as neededProgramCall: sysapplication. getinstance (). exit (); sysapplication. getinstance (). exit (); in short, the reference of each activity is added to a global linked list in singleton mode, and the system is called every time the program exits. exit ( 0 ), First call the finish method of the activity in the linked list. For more information about this method, see http:  // Maosidiaoxian.iteye.com/blog/1404725 

 

Method 2: Use Broadcast

// 2 . 2 exiting the entire application will inevitably be confusing. Once upon a while, we tried the following method: activitymanager = (Activitymanager) Context. getsystemservice (context. activity_service); manager. killbackgroundprocesses (  Package  ); // No Android. OS. process. killprocess (Android. OS. process. mypid (); // no manager. restartpackage (  Package  ); // Still cannot use intent myintent = New Intent (intent. action_main); myintent. addcategory (intent. category_home); startactivity (myintent); finish (); // This is only returned to the desktop. If you open multiple activities and close them again, the problem may occur, still not working. // when someone says that the broadcast mechanism is good, the problem can be completely solved. If you don't talk nonsense, read the code:  Public   Abstract   Class Enteractivity Extends  Baseactivity {...  //  Write an internal broadcast class. When an action is received, the activity ends.  Private Broadcastreceiver = New  Broadcastreceiver () {@ override Public   Void  Onreceive (context, intent) {unregisterreceiver (  This ); //  This statement must be written to avoid errors. If it is not written, a bunch of errors will be reported even if it can be closed.  (Activity) Context). Finish () ;};@ override  Public   Void  Onresume (){  Super  . Onresume ();  //  Register broadcast in current activity Intentfilter filter = New  Intentfilter (); filter. addaction (attribute. pagename); registerreceiver (  This . Broadcastreceiver, filter ); //  Register  }  Public   Void  Close () {intent = New  Intent (); intent. setaction (attribute. pagename );  //  Action Description Sendbroadcast (intent );//  This function is used to send broadcasts.  Finish () ;}...} someone else wrote something missing (unregisterreceiver). This must be added. Otherwise, a bunch of errors will occur and the simplest method is found. 

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