How to switch tabs programmatically in Android from fragment?

Question

I have implemented a TabActivity which extends FragmentActivity. It has 5 tabs each tab is a Fragment. What i am looking for is to switch between the tabs programmatically.

For eg: if i am in tab4. On button click I want to move from tab4 to tab1. Tried a lot but couldn't find the solution for this.

Tried with the following but it doesn't help.

From SecondTab

public void switchTabInActivity(String value){
    FirstTab parent;
    parent = (FirstTab) getActivity().getParent();
    parent.switchTab(value);
}

TabActivity

  /** To Change Tab*/
public void switchTab(String tabno){ 
    this.onTabChanged(tabno);
}

Porscheporsena

Answer 1

Finally i can switch between the tabs programatically from Fragments using the following line of code

  TabHost host = (TabHost) getActivity().findViewById(android.R.id.tabhost);
  host.setCurrentTab(2);

Hope it will help some one.

Porscheporsena

android.R.id.tabhost will throw a nullpointerexception. You are already calling getActivity.findViewById findViewById(R.id.tabhost) is the right option – Hoagland

Answer 2

for Material support you switch the tablayout from a fragment in the following ways:

1) send a broadcast that is received by the parent activity which then modifies the tab.

context.sendBroadcast(yourintent);

2.) A modification of vino's answer,

TabLayout tabhost = (TabLayout) getActivity().findViewById(R.id.tabLayout);
tabhost.getTabAt(2).select();

tablayout is the id of the tablayout as defined in your main xml.

Uhl

Yes it works, just for information tab indexes starts from 0. – Murex

Hi @Kennedy, my tabhost is not getting initialised. It is showing null. What could be the mistake for NullPointerException?? – Verminous

It's working now, error was due to a silly mistake of mine. :) – Verminous

Hi! Can someone please help me? I am getting an error: Cannot resolve method 'getActivity()'. – Oldtime

@LloydDominic make sure you are working from a fragment. – Uhl

Answer 3

I have tabs (using TabLayout not TabHost(depreciated))(with Fragments) in my Main Activity in which in my first tab(fragment) with a click listener in the fragment which is for changing the current tab in my MainActivity.

I successfully change the current tab via the below in the onCreateView() method within the fragment.

TabLayout tabs = (TabLayout)((MainActivity)getActivity()).findViewById(R.id.tabs);
tabs.getTabAt(1).select();

Imprisonment

this is working answer... upper ones not working because tablayout is null in fragments even if we pass it via constructor.. – Esperanzaespial

Or a little more succinctly: TabLayout tabs = requireActivity().findViewById(R.id.tabs); tabs.getTabAt(1).select(); – Ribaldry

Answer 4

Take a look at this answer: https://mcmap.net/q/501311/-how-to-change-tab-of-a-tabactivity-from-an-activity-started-by-the-tabactivity-or-change-current-tab

((TabActivity) getParent()).getTabHost().setCurrentTab(2)

Lolalolande

Thanks Tom i think thats from activity i am looking from Fragment – Porscheporsena

@Vino That's from the Fragment. The getParent() is a method in Fragment which returns the Activity. – Clank

@Vino try getActivity() instead of getParent() then. – Lolalolande

yes tried that but i am facing The method getTabHost() is undefined for the type TabActivity ((TabActivity) getActivity()).getTabHost().setCurrentTab(3); – Porscheporsena

use switchTab() and cast it as your concrete implementation rather than TabActivity then. Note that TabActivity is deprecated. – Clank

@Vino Implement a method getTabHost() in your TabActivity, which returns the TabHost... – Lolalolande

Found an answer Tom.I have answered my question. Thanks for your support. – Porscheporsena

Well, that's basically what I said. Anyway, good to hear you solved your problem. – Lolalolande

Answer 5

If you're using TabLayout instead of TabHost , I suggest a modification to BENN1TH's answer that worked for me:

  TabLayout tabs = getActivity().findViewById(R.id.tab_layout);
  tabs.getTabAt(tabNumber).select(); 

(The difference is R.id.tab_layout)

Bowdlerize

Answer 6

for kotlin , Please use this form fragment

 activity!!.<tab_id_in_xml>.getTabAt(tab_number)!!.select()

Krawczyk

Answer 7

Here's another approach in 'newer' kotlin:

requireActivity().findViewById<TabLayout>(R.id.tab_layout)?.getTabAt(destinationTabNumber)?.select()

using ?. instead of !! to avoid asserting.

Carreno