android tabs - starting a new activity

Question

There are 4 Tabs in a TabHost, let them be A, B, C, and D. Now each one is just an index page and clicking on any of them shows a different activity.

The problem is

Answer 1

Try this, found this solution in android cookbook, http://androidcookbook.com/Recipe.seam;jsessionid=5424397F3130CE7769FF47DD67742911?recipeId=1693&recipeFrom=ViewTOC

Answer 2

Can't you change the contentView of your tab instead of starting a new Activity ?

Maybe I'm wrong but I think also that starting an activity in a tab isn't possible because the TabView is hosted in a activity and not the opposite (Tabview don't host an activity per Tab).

Answer 3

It looses the view hierarchy. When you press the back button, in my case, the app closes.

Answer 4

I think the common consensus is that it is best not to use individual Activities as tab content due to these limitations. See these questions and answers for pointers to alternatives:

Android: Why shouldn't I use activities inside tabs? Android - Tabs, MapView, activities within tabs

Answer 5

To summarize the link that Rukmal Dias provided. Here's what you do:

1. Change your current Activity (that's in a tab) to derive from ActivityGroup
2. Create a new intent for the Activity you want to switch to

3. Copy/Paste and call this function in your current activity where "id" is the "android:id" for the layout of the new activity you want to switch to

    public void replaceContentView(String id, Intent newIntent){
         View view = getLocalActivityManager().startActivity(id,newIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)) .getDecorView(); 
         this.setContentView(view);}
   

Here's an example of how I make the call to switch views from my current Tabbed Activity:

public void switchToNextActivity(View view)
{
    Intent myIntent = new Intent(getApplicationContext(), MyNextActivity.class);
    replaceContentView("next_activity", myIntent);
}