为什么片段onCreateView被调用两次?

时间:2015-08-29 09:10:12

标签: android android-viewpager fragment

我使用的是viewpager,但是片段有问题。 我的片段onCreateView被调用两次。 这是我的代码 适配器:

public class QuestionAdapter extends FragmentStatePagerAdapter {

/**
 * @param fm
 *            Fragment manager
 */
public QuestionAdapter(FragmentManager fm) {
    super(fm);

}

/*
 * (non-Javadoc)
 * 
 * @see android.support.v4.app.FragmentStatePagerAdapter#getItem(int)
 */
@Override
public Fragment getItem(int position) {

    if (position == 4) {

        return InfoFragment.getInstance();
    }

    return QuestionFragment.getInstance(position);
}

/*
 * (non-Javadoc)
 * 
 * @see android.support.v4.view.PagerAdapter#getCount()
 */
@Override
public int getCount() {

    return 5;
}

/*
 * (non-Javadoc)
 * 
 * @see
 * android.support.v4.view.PagerAdapter#getItemPosition(java.lang.Object)
 */
@Override
public int getItemPosition(Object object) {
    return POSITION_NONE;
}

我的片段代码:

public class QuestionFragment extends Fragment {

private int mPos;

@Bind(R.id.fragment_question_group_layout)
RadioGroup questionGroup;

public static QuestionFragment getInstance(int pos) {

    QuestionFragment fragment = new QuestionFragment();
    fragment.setPos(pos);
    return fragment;
}

public void setPos(int pos) {
    this.mPos = pos;
}


@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
        @Nullable Bundle savedInstanceState) {

    LogUtil.e("QuestionFragment", "Pos : " + mPos);
    View view = inflater.inflate(R.layout.fragment_question, container, false);
    ButterKnife.bind(this, view);

    switch (mPos) {

        case 0 :

            displayQuestion(getResources().getStringArray(R.array.question1_content));
            break;
        case 1 :

            displayQuestion(getResources().getStringArray(R.array.question2_content));
            break;
        case 2 :

            displayQuestion(getResources().getStringArray(R.array.question3_content));
            break;
        default :

            displayQuestion(getResources().getStringArray(R.array.question4_content));
            break;
    }

    return view;
}

这是log:

  • E / QuestionFragment:Pos:0
  • E / QuestionFragment:Pos:1
  • E / QuestionFragment:Pos:2
  • E / QuestionFragment:Pos:3
  • E / InfoFragment:Pos:
  • E / QuestionFragment:Pos:0
  • E / QuestionFragment:Pos:0
  • E / QuestionFragment:Pos:0
  • E / QuestionFragment:Pos:0
  • E / InfoFragment:Pos:

编辑: 我已经设置了:viewPager.setOffscreenPageLimit(4);在活动上 当我打开活动时,上面的日志得到了,没有刷卡动作。只需打开活动并获取日志

1 个答案:

答案 0 :(得分:0)

我解决了我的问题,它是:

  • 我的手机的方向是:人像
  • 我的应用程序是:landscape

当我运行我的应用程序时,由于配置更改,片段将重新创建。我推了

android:configChanges="keyboardHidden|screenSize|orientation"

在清单上然后一切正常