Question

At first the problem was getView() always returns null in my fragment . so as others offer I used a View in onCreateView to get view like this :

     private  View vv ;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
    vv = inflater.inflate(R.layout.fragment_exam_page2, container, false); ;
    return  vv ;

}

so I could use vv instead of getView() . But now I see that onCreateView does not get called at all ! in my activity I do this :

    FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
    TwoLineOptionsFragment twoLineOptionsFragment = new TwoLineOptionsFragment();
            transaction.replace(R.id.fragment_answerContainer, twoLineOptionsFragment).commit();

            twoLineOptionsFragment.updateOptions(question.AnswerOptions) ;// my public function doing stuff ...

so where is the problem ?

EDIT : here is my function if matters :

    public  boolean updateOptions(ArrayList<Exam.Question.Answer> answers)
    {
    try
    {


        QuestionOptionView optionView = (QuestionOptionView)(vv.findViewById(R.id.option1)) ;
        //QuestionOptionView optionView = (QuestionOptionView)(getView().findViewById(R.id.option1)) ;
        optionView.setText(answers.get(0).AnswerText);
    return reue ;
    }
    // ... 
    }

Answer 1

片段的

onCreateView（）将始终被调用。您遇到的问题是在调用onCreateView（）之前尝试访问视图对象。以下内容过早执行。

true

请勿直接从活动中调用twoLineOptionsFragment.updateOptions(question.AnswerOptions) ;方法，因为您可能不确定Fragment是否已准备就绪。您应该将您的逻辑移动到Fragment类本身并提供对Fragment的回调，以便您可以将结果传递回活动。

在您的情况下，您可以将Activity值作为参数传递给Fragment并将其显示在TextView上。干杯：）

answers.get(0).AnswerText

onCreateView does not fired in Fragment

1 个答案: