Android的：不能添加/替换片段

问题描述：

我想一个新片段添加到我的应用程序。结果
但是，这片段是空。

I'm trying to add a new fragment to my app.
But this fragment is null.

我在做什么错了？

片段启动：

ConvertOptions fragment = (ConvertOptions) getSupportFragmentManager()
                    .findFragmentByTag(Utils.CONVERT_FRAGMENT_TAG);

            if (fragment != null)
            {
                getSupportFragmentManager()
                        .beginTransaction()
                        .add(R.id.container, fragment, Utils.CONVERT_FRAGMENT_TAG)
                        .commit();
            }

片段的类code：

Code of Fragment's class:

    public class ConvertOptions extends Fragment
{
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.convert_options_fragment, null);

        return view;
    }
}

XML：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/options_convert_fragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:weightSum="1">


<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="New Button"
    android:id="@+id/button2"
    android:layout_gravity="center_horizontal" />

答

只要做到这一点：

ConvertOptions mConvertOptions = new ConvertOptions();
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.content_frame, mConvertOptions);
fragmentTransaction.commit();

Android的：不能添加/替换片段

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