NullPointerException初始化片段中的视图 [英] NullPointerException Initialize View in Fragment

问题描述

我使用Fragment将我的内容保存在TabLayout中.在里面，我有按钮.当我尝试在Fragment类中实例化时，出现以下错误:

i use Fragment to hold my content in TabLayout. Inside it, i have Button. When i try to instantiate in Fragment class i get this following error :

com.example.fanjavaid.tablayout E/AndroidRuntime: FATAL EXCEPTION: main
      java.lang.NullPointerException
          at com.example.fanjavaid.tablayout.fragment.AccountFragment.onCreateView(AccountFragment.java:27)
          at android.support.v4.app.Fragment.performCreateView(Fragment.java:2080)
          at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1108)
          at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1290)
          at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:801)
          at android.support.v4.app.FragmentManagerImpl.execSingleAction(FragmentManager.java:1638)
          at android.support.v4.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:679)
          at android.support.v4.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:166)
          at android.support.v4.view.ViewPager.populate(ViewPager.java:1240)
          at android.support.v4.view.ViewPager.populate(ViewPager.java:1088)
          at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1614)

这是我在 onCreateView(...)

public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        RelativeLayout mFragmentAccount = (RelativeLayout) getActivity().findViewById(R.id.fragment_account);

        mBtnAddPerson = (Button) mFragmentAccount.findViewById(R.id.add_person);
        Typeface font = Typeface.createFromAsset(mFragmentAccount.getContext().getAssets(), "/fonts/Rubik-Regular.ttf");
        mBtnAddPerson.setTypeface(font);

        return inflater.inflate(R.layout.fragment_account, mFragmentAccount,true);
    }

这是我的Fragment XML布局:

And here is my Fragment XML layout :

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/fragment_account"
    android:padding="@dimen/activity_horizontal_margin"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true"
        android:text="Hello Android!"/>

    <Button
        android:id="@+id/add_person"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:gravity="center"
        android:text="Add People"/>

</RelativeLayout>

我想念什么?

谢谢

推荐答案

您正在尝试从活动"中获取视图.您必须给片段充气.

You are trying to get your View from your Activity. You have to inflate your fragment.

View rootView = inflater.inflate(R.id.fragment_account, container, false);

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