3 tabs with each one carry 1 fragment and when press back go to previous tab

Question

I want to create 3 tabs and each one have single fragment,when i press back button in device instead of closing of app i need to go previous tab.I had try a lot but not find correct answer which is suitable for my app.I am new to development.

What i have in my project is 3 tabs when i am at tab 3 if i press it needs to go tab 2 instead of closing app.

What ever suggestions i get those are helped only go back to previous fragment. But i want go to previous tab when we press back button in android device.

Possible duplicate of [Use backstack with ViewPager](http://stackoverflow.com/questions/12712917/use-backstack-with-viewpager) — Daniel Nugent, Jun 17 '16 at 13:48
i will try this and i will post my code my be you can get idea about it. — Bhargavi Yamanuri, Jun 18 '16 at 05:03

score 1 · Answer 1 · answered Jun 17 '16 at 13:02

1

This can be easily achieved by overriding onBackPressed(). The key here is to keep track of your current fragment and swatch tabs based on that info.

@Override
public void onBackPressed() {
    switch(activeFragment){
        case 3: triggerTab2();
            break;
        case 2: triggerTab1();
           break;
        case 1: super.onBackPressed();
            break;
    }
}

answered Jun 17 '16 at 13:02

MrJM

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i had try this with my code but it is also not working – Bhargavi Yamanuri Jun 18 '16 at 05:05

score 0 · Answer 2 · answered Jun 17 '16 at 12:58

0

For creating Tabs with fragments Check this link - http://www.androidhive.info/2015/09/android-material-design-working-with-tabs/

For on Back button pressed you need to override onBackPressed() in the activity not in fragments. You need to handle back pressed and provide index of respective tab.

Hope it will help

answered Jun 17 '16 at 12:58

Onkar Nene

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i had try that but there is no back stack in that code.when i try to add it is not work. – Bhargavi Yamanuri Jun 18 '16 at 05:05

score 0 · Answer 3 · answered Jun 17 '16 at 13:01

Use this

  @Override
public void onBackPressed() {
    // put switch or if which decide which fragment 
    Class fragmentClass = Fragment.class;
            Fragment fragment = null;
            try {
                fragment = (Fragment) fragmentClass.newInstance();
            } catch (java.lang.InstantiationException e) {
                e.printStackTrace();
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            }

            ((Activity) getContext()).getSupportFragmentManager().beginTransaction()
                    .replace(R.id.content_fragment, fragment).commit();

            // R.id.content_fragment => id of viewPager
}

score 0 · Accepted Answer · edited May 23 '17 at 11:59

0

If you have different fragments in one tab if you press back button by using OnBackPressed() we can go for previous fragment.For that situation following code will help you.

    @Override 
public void On BackPressed(){
//You can check by write toast if it working are not.
FragmentManager manager = getSupportFragmentManager();
if (manager.getBackStackEntryCount() > 0) {
    // If there are back-stack entries, leave the FragmentActivity
    // implementation take care of them.
    //implement your code here.

    super.onBackPressed();
 }
}

It will help you to go back of your previous fragments not previous tabs.

this will help you understand. Separate Back Stack for each tab in Android using Fragments

edited May 23 '17 at 11:59

Community

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answered Jul 29 '16 at 11:24

YBDevi

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[http://stackoverflow.com/questions/6987334/separate-back-stack-for-each-tab-in-android-using-fragments] this will help you – YBDevi Jul 29 '16 at 11:44
that link is give lot of information edit your answer i will accept it. – Bhargavi Yamanuri Jul 29 '16 at 11:48

3 tabs with each one carry 1 fragment and when press back go to previous tab

4 Answers4