CODEWITHSUNDEEP
androidnullpointerexceptionfragment
user1304
user1304

Reputation: 245

nullpointerexception when calling fragment methods from activity

i have a fragmentactivity which calls other fragment by : 

FragmentView1 f = (FragmentView1) this.getSupportFragmentManager()
                .findFragmentByTag(getFragmentTag(0));

and my getFragmentTag() function is : 

private String getFragmentTag(int pos){
    return "android:switcher:"+R.id.viewpager+":"+pos;   //fragmentpageradapter auto generated tag
}

not the problem is whenever i call f.somemethod , i get a nullpointerexception .

i tried with 

Log.w("HELLO1",""+ f.getTag());

it return nullpointerexception .

Upvotes: 1

Views: 975

Answers (1)

Nick Rempel
Nick Rempel

Reputation: 3022

findFragmentByTag() is returning null because it is not finding a fragment with the specified tag as per the docs. Ensure you are setting the fragment's tag in your layout or programatically at transaction time.

Refer to this question for more information on this.

Upvotes: 1

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