"Go" Android completely quits the app

Original URL: http://www.yoyong.com/archives/199

The Android Exit application calls Android.os.Process.killProcess (Android.os.Process.myPid ()) or system.exit (0), which is only for the first activity ( Activity at the entrance). If you have a,b,c three activity, and you want activity to exit in B or C, calling the method above will often destroy the current activity to return to the previous activity. Of course, you can return to the last activity one by one until you jump to the activity in the portal and exit the application. But it's more troublesome and the experience of returning one by one is not friendly.

The popular method on the web is to define stacks, write a exitapplication class, manage the activity with a singleton pattern, and Invoke exitapplication.getinstance () in each oncreate () method of the activity. The addactivity (This) method, which calls the Exitapplication.getinstance (). Exit () method on exit, to exit the application completely.
Exitapplication class
The code is as follows:

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2. Import java.util.LinkedList;
4. Import java.util.List;
8. Import android.app.Activity;
10. Import android.app.Application;
14. Public class Exitapplication extends application {
18. private List activitylist = new LinkedList ();
20. private static exitapplication instance;
24. private exitapplication ()
26. {
28. }
30. //Get a unique exitapplication instance in a singleton mode
32. public static Exitapplication getinstance ()
34. {
36. if (null = = instance)
38. {
40. Instance = new Exitapplication ();
42. }
44. return instance;
48. }
50. //Add activity to the container
52. public void addactivity (activity activity)
54. {
56. Activitylist.add (activity);
58. }
60. //Traverse all activity and finish
64. public Void exit ()
66. {
70. For (Activity activity:activitylist)
72. {
74. Activity.finish ();
76. }
80. System.exit (0);
84. }
86. }

The following three classes of indexactivity, bactivity,cactivity are simple examples, respectively, are the indexactivity–>bactivity–>cactivity of the jump order. The Exitapplication.getinstance (). Addactivity (activity activity) method is called in the OnCreate () method in each activity class. When exiting an application in any of the activity interfaces, simply call the Exitapplication.getinstance (). Exit () method to completely exit the application in any activity.
Indexactivity Class Source code:

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2. Import android.app.Activity;
4. Import android.content.Intent;
6. Import Android.os.Bundle;
8. Import Android.view.View;
10. Import Android.view.View.OnClickListener;
12. Import Android.widget.Button;
16. Public class Indexactivity extends Activity {
18. /** Called when the activity is first created. * /
20. @Override
22. public void OnCreate (Bundle savedinstancestate) {
24. super.oncreate (savedinstancestate);
26. Setcontentview (R.layout.main);
30. Button next= (button) Findviewbyid (R.id.next_to_b);
32. Next.setonclicklistener (Nextclick);
36. Button exit= (button) Findviewbyid (R.id.exit_main);
38. Exit.setonclicklistener (Exitclick);
40. Exitapplication.getinstance (). Addactivity (this);
44. }
48. Onclicklistener nextclick=New Onclicklistener () {
52. @Override
54. public void OnClick (View v) {
56. //TODO auto-generated method stub
60. Intent intent=New Intent (indexactivity. This,bactivity.  class);
62. StartActivity (Intent);
66. }
68. };
72. Onclicklistener exitclick=New Onclicklistener () {
76. @Override
78. public void OnClick (View v) {
80. //TODO auto-generated method stub
82. Exitapplication.getinstance (). exit ();
84. }
86. };
88. }

Bactivity Class Source code:

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2. Import android.app.Activity;
4. Import android.content.Intent;
6. Import Android.os.Bundle;
8. Import Android.view.View;
10. Import Android.view.View.OnClickListener;
12. Import Android.widget.Button;
16. Public class Bactivity extends Activity {
20. @Override
22. protected void OnCreate (Bundle savedinstancestate) {
24. TODO auto-generated Method Stub
26. Super.oncreate (savedinstancestate);
30. Setcontentview (r.layout.b);
32. Button next_to_c= (button) Findviewbyid (R.id.next_to_c);
34. Next_to_c.setonclicklistener (Next_to_cclick);
38. Button exit_b= (button) Findviewbyid (r.id.exit_b);
40. Exit_b.setonclicklistener (Exitclick);
42. Exitapplication.getinstance (). Addactivity (this);
46. }
50. Onclicklistener next_to_cclick=New Onclicklistener () {
54. @Override
56. Public void OnClick (View v) {
58. TODO auto-generated Method Stub
62. Intent intent=New Intent (bactivity. This,cactivity.  class);
64. StartActivity (Intent);
68. }
70. };
74. Onclicklistener exitclick=New Onclicklistener () {
78. @Override
80. Public void OnClick (View v) {
82. TODO auto-generated Method Stub
84. Exitapplication.getinstance (). exit ();
86. }
88. };
90. }

Cactivity Class Source code:

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2. Import android.app.Activity;
4. Import Android.os.Bundle;
6. Import Android.view.View;
8. Import Android.view.View.OnClickListener;
10. Import Android.widget.Button;
14. Public class Cactivity extends activity{
18. @Override
20. protected void OnCreate (Bundle savedinstancestate) {
22. TODO auto-generated Method Stub
24. Super.oncreate (savedinstancestate);
28. Setcontentview (R.LAYOUT.C);
32. Button exit_c= (button) Findviewbyid (R.id.exit_c);
34. Exit_c.setonclicklistener (Exitclick);
36. Exitapplication.getinstance (). Addactivity (this);
40. }
44. Onclicklistener exitclick=New Onclicklistener () {
48. @Override
50. Public void OnClick (View v) {
52. TODO auto-generated Method Stub
54. Exitapplication.getinstance (). exit ();
56. If you just call one of the following methods, the app does not exit completely
58. Android.os.Process.killProcess (Android.os.Process.myPid ());
60. System.exit (0);
62. }
64. };
68. }

Source Download : Exitactivity.zip

"Go" Android completely quits the app