在片段上输入EditText，并填充所有其他片段

<EditText
    android:id="@+id/editText"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:hint="请输入文本" />

public class EditTextFragment extends Fragment {
    private EditText editText;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_edit_text, container, false);
        editText = view.findViewById(R.id.editText);
        return view;
    }
}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <fragment
        android:id="@+id/editTextFragment"
        android:name="com.example.EditTextFragment"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <!-- 其他片段的布局 -->

</LinearLayout>

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        FragmentManager fragmentManager = getSupportFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();

        EditTextFragment editTextFragment = new EditTextFragment();
        fragmentTransaction.add(R.id.editTextFragment, editTextFragment);

        // 添加其他片段

        fragmentTransaction.commit();
    }
}