Activitygroup Brief Introduction

Activitygroup Brief Introduction

1.ActivityGroupthe core is to inherit the class, you can get a getlocalactivitymanager () Localactivitymanager

Such as, Localactivitymanager am= Getlocalactivitymanager ();

2.And then throughLocalactivitymanagerPassstartactivity (String ID, Intent Intent),Ability to work with the specifiedactiivtybinding, and returns aWindow。LocalactivitymanagerBe able to manage multiple at the same timeActivity

Window Window1 = am.startactivity ("Module1", Newintent (Testview.this, Moduleview1.class));
Window Window2 = am.startactivity ("Module2", Newintent (Testview.this, Moduleview2.class));

3.And thenWindowTo passGetdecorview ()Method, returns aView,And then through the container with the specifiedAddView (View)Method,Achieve a different effect

View view1 = Window1.getdecorview ()
View view2 = Window2.getdecorview ()

in practice, many shorthand forms , such as
ContainerIsScrollViewAn instance of
container.removeallviews (); //Remove all other child views
Container.addview (Getlocalactivitymanager (). StartActivity (
"Module2",
New Intent (Testview.this, Moduleview2.class)
. Addflags (Intent.flag_activity_clear_top))
. Getdecorview ());

Attention:
Container.removeallviews ():Indicates that all other views are removed before the view is displayed.
Intent.flag_activity_clear_top:Assuming that the currentTask, you have to start theActivity, then put theacitivityAll the previousActivityAll off, and put thisActivityPre-set to avoid creatingActivityInstances of

this way has very great flexibility, often used is to achieve tabhost paging effect, but very good to avoid the shortcomings of Tabhost , such as title

Assume that four activity:a,b,c and d have been started. In d activity, we want to jump to B activity, at the same time want C finish off, can be in startactivity (intent) in the intent to add the flags, such as the following see:

Intent Intent = new Intent (this, b.class); Intent.setflags (Intent.flag_activity_clear_top); startactivity (intent);

To start B activity, you will finished d,c, assuming that your B activity's startup mode is the default (multiple), B activity will finished off, and then start a new Activity B. Assuming that you don't want to create a new B Activity again, add it in the code above:

Intent.addflags (Intent.flag_activity_single_top);

Then B activity will create a new one, but will reuse the previous B activity, at the same time invoke B activity's onnewintent () method.

Problem:
Multiple activity exits the entire program, such as from A->b->c->d, when I need to exit the program from D directly.

Online information:{
Both finish () and system (0) can only exit a single activity. Kill the process, etc.
To solve this problem:
We know that the Android form class provides a history stack, which we can skillfully implement using the stack principle, where we add the flag intent.flag_activity_clear_top directly to the intent in the D form when we open the a form. When you turn on a again, all activity for that process space will be cleared.
Use the following code in D:

Intent Intent = new Intent (); Intent.setclass (D.this, A.class); Intent.setflags (intent.flag_activity_clear_top); Note The bank's flag setting startactivity (intent); finish ();

Shut yourself down.
Add the code in a:

overrideprotected void Onnewintent (Intent Intent) {//TODO auto-generated method Stubsuper.onnewintent (Intent);//Exit if ( (Intent.flag_activity_clear_top & Intent.getflags ())! = 0) {finish ();}}

A manifest.xml is configured as android:launchmode= "Singletop"

Principle Summary:
General A is the entry point of the program, from D to a ACTIVITY, to increase the identity of the Intent.flag_activity_clear_top this process will be b,c in the stack, are cleared away. Because A is android:launchmode= "Singletop"
does not call OnCreate (), but responds to Onnewintent () by this time infer intent.flag_activity_clear_top, and then put a finish () off.
All the a,b,c,d in the stack are cleaned up. So the whole program exited.

Activitygroup Brief Introduction