Question

I want to manage all activities with class conductor like this:


Also all activities extend base activity to use common view.
In this case, I want to handle transfer activity, for example:

 Base -> First -> Second -> Third -> First
 Base -> First -> Fourth -> Fifth -> Fourth

When transferring activity, Conductor must handle all activity in stack.
I try to write this conductor as below (I use list to manage instead of stack):

public class Conductor {    
   private List<Activity> listOfActivityInStack;  

   public Conductor(){
  listOfActivityInStack = new ArrayList<Activity>();
   }
   public void startActivity(Activity activity, Class<?> cls){
  listOfActivityInStack.add(activity);
  Intent i = new Intent(activity.getApplicationContext(), cls);
  activity.startActivity(i);
}

   public void startActivityForResult(Activity activity, Class<?> cls, int requestCode){
  listOfActivityInStack.add(activity);
  Intent i = new Intent(activity.getApplicationContext(), cls);
  activity.startActivityForResult(i, requestCode);
}

   public void startAcitivtyClearPrevious(Activity activity, Class<?> cls){
  listOfActivityInStack.clear();
  listOfActivityInStack.add(activity);
  Intent i = new Intent(activity.getApplicationContext(), cls);
  i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
  activity.startActivity(i);
}

   public int getCount(){
  if(listOfActivityInStack == null)
    return 0;
  return listOfActivityInStack.size();
 }
 }

I store this conductor in Global variable. Then I use it as below:

  //Get conductor from application global
  conductor.startActivity(FirstActivity.this, SecondActivity.class);
  //Then add conductor to application global

But I have some problem:

• I must handle goBack() for all activity to remove activity from list.
• Check activity has exist in list, if yes, try get its instance.

Is there best way to manage all activity on android? I have tried search but not found good answer.
I wonder weather or not my way is right. Any recommend or example would be help!

Answer 1

there is one way to do this. you must save your all activities state. and when you need to recall them you must use that state.

for extra info look here:

Saving Android Activity state using Save Instance State