如何刷新片段

Question

我有一个包含片段的Activity。是否有一种简单的方法来刷新片段？ 我想过像getFragmentManager().beginTransaction().refresh().commit();这样的东西...... 但是没有什么能像刷新一样。有什么建议？ My Fragment举着一个显示随机数的祝酒词。我想要反映片段，以便toast显示一个新的随机数，分别从Fragment.onCreateView（）重做代码

public static class PlaceholderFragment extends Fragment {

    TextView tv_question;
    Button btn_answer_1;
    Button btn_answer_2;
    Button btn_answer_3;

    public PlaceholderFragment() {
    }

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

        Toast.makeText(getActivity(), String.valueOf(Math.random()), Toast.LENGTH_LONG).show();

        tv_question = (TextView)rootView.findViewById(R.id.tv_question);
        SupportFunctions.setViewBackgroundWithDrawable(tv_question, getResources().getDrawable(R.drawable.quiz_question_background));

        btn_answer_1 = (Button)rootView.findViewById(R.id.btn_answer_1);
        btn_answer_2 = (Button)rootView.findViewById(R.id.btn_answer_2);
        btn_answer_3 = (Button)rootView.findViewById(R.id.btn_answer_3);
        SupportFunctions.setViewBackgroundWithDrawable(btn_answer_1, getResources().getDrawable(R.drawable.quiz_answer_background));
        SupportFunctions.setViewBackgroundWithDrawable(btn_answer_2, getResources().getDrawable(R.drawable.quiz_answer_background));
        SupportFunctions.setViewBackgroundWithDrawable(btn_answer_3, getResources().getDrawable(R.drawable.quiz_answer_background));
        btn_answer_1.setOnClickListener(btn_answer_listener);
        btn_answer_2.setOnClickListener(btn_answer_listener);
        btn_answer_3.setOnClickListener(btn_answer_listener);

        // LOAD QUESTION FROM DB

        Globals.setCORRECT_ANSWER(1);

        // SHUFFLE ANSWERS

        return rootView;
    }

    public OnClickListener btn_answer_listener = new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub

            int id = v.getId();

            if (id == R.id.btn_answer_1 && Globals.getCORRECT_ANSWER() == 1) {
                // correct
                answerCorrect();
            }
            else if (id == R.id.btn_answer_2 && Globals.getCORRECT_ANSWER() == 2) {
                // correct
                answerCorrect();
            }
            else if (id == R.id.btn_answer_3 && Globals.getCORRECT_ANSWER() == 3) {
                // correct
                answerCorrect();
            }
            else {
                answerWrong();
            }

        }

    };

    private void answerCorrect() {

        Globals.incrementAnswersTotal(); // got to become sharedPreference
        Globals.incrementAnswersRound(); 
        Globals.incrementCorrectAnswersTotal(); // sharedPreference
        Globals.incrementCorrectAnswersRound();

        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        builder.setIcon(getResources().getDrawable(R.drawable.quiz_ic_dialog_correct));
        builder.setTitle(getResources().getString(R.string.ad_correct_answer_heading));
        builder.setMessage(getResources().getString(R.string.ad_correct_answer_text));
        builder.setPositiveButton(R.string.ad_keep_on, new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                // TODO Auto-generated method stub
                getFragmentManager().beginTransaction().replace(R.id.container, getFragmentManager().findFragmentById(R.id.container)).commit();
            }

        });
        builder.setNegativeButton(R.string.ad_to_menu, new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                // TODO Auto-generated method stub
                startActivity(new Intent(getActivity(), ActivityAppLaunch.class));
            }

        });
        builder.setCancelable(false);


        AlertDialog alert = builder.create();
        alert.show();

    }

    private void answerWrong() {

        Globals.incrementAnswersTotal(); // got to become sharedPreference
        Globals.incrementAnswersRound(); 

        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        builder.setIcon(getResources().getDrawable(R.drawable.quiz_ic_dialog_wrong));
        builder.setTitle(getResources().getString(R.string.ad_wrong_answer_heading));
        builder.setMessage(getResources().getString(R.string.ad_wrong_answer_text) + "mein Text hier");
        builder.setPositiveButton(R.string.ad_keep_on, new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                // TODO Auto-generated method stub

            }

        });
        builder.setNegativeButton(R.string.ad_to_menu, new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                // TODO Auto-generated method stub
                startActivity(new Intent(getActivity(), ActivityAppLaunch.class));
            }

        });
        builder.setCancelable(false);

        AlertDialog alert = builder.create();
        alert.show();

    }

}

Answer 1

正如Ben Pearson所说，不是将所有代码放在onCreateView（）中，而是制作另一种方法：

public void showNewRandomNumber() {
    Toast.makeText(getActivity(), String.valueOf(Math.random()), Toast.LENGTH_LONG).show();
}

然后从任何地方打电话给它。听起来你想在positiveButton的onClick方法中调用它，这样就可以了（如果是这样的话，那么showNewRandomNumber就不必具有公共可见性）。