Fragment 안에 Fragment 넣기

오늘은 코드 위주로!

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
    ...
    android:id="@+id/fragment_container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    ...>

</FrameLayout>

MainActivity.java

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
        ft.replace(R.id.fragment_container, ParentFragment.newInstance());
        ft.commit();
    }
}

fragment_parent.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <strongutton
            android:id="@+id/btn_one"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:text="one"/>

        <strongutton
            android:id="@+id/btn_tow"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:text="tow"/>

    </LinearLayout>

    <FrameLayout
        android:id="@+id/child_fragment_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</LinearLayout>

ParentFragment.java

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
...

public class ParentFragment extends Fragment implements View.OnClickListener {
    public static ParentFragment newInstance() {
        return new ParentFragment();
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }


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

        Button btn_one, btn_tow;
        btn_one = (Button) fv.findViewById(R.id.btn_one);
        btn_one.setOnClickListener(this);
        btn_tow = (Button) fv.findViewById(R.id.btn_tow);
        btn_tow.setOnClickListener(this);

        return fv;
    }

    @Override
    public void onClick(View view) {

        Fragment fg;
        switch (view.getId()) {
            case R.id.btn_one:
                fg = ChildOneFragment.newInstance();
                setChildFragment(fg);
                break;
            case R.id.btn_tow:
                fg = ChildTowFragment.newInstance();
                setChildFragment(fg);
                break;
        }
    }

    private void setChildFragment(Fragment child) {
        FragmentTransaction childFt = getChildFragmentManager().beginTransaction();

        if (!child.isAdded()) {
            childFt.replace(R.id.child_fragment_container, child);
            childFt.addToBackStack(null);
            childFt.commit();
        }
    }
}

isAdded()를 사용하여 Fragment가 존재하는 지 확인 후 작업.
FragmentTransaction 에 add(int containerViewId, Fragment, fragment) 를 사용하면
버튼을 누를 때마다 계속 Fragment가 생겨나서
replace(int containerViewId, Fragment, fragment) 하여 container가 재사용되도록 했다.
addToBackStack(String name)을 호출하면 생성하는 childFragment 들이 차곡차곡 쌓여
back 버튼을 누를 때마다 이전 Fragment로 순차적으로 돌아간다.

fragment_child_one.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:orientation="vertical">

    <TextView
        android:id="@+id/textView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:text="Child_Fragment_One"/>
</LinearLayout>

ChildOneFragment.java

import android.support.v4.app.Fragment;
...

public class ChildOneFragment extends Fragment {
    public static ChildOneFragment newInstance(){
        return new ChildOneFragment();
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }


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

        return fv;
    }
}

fragment_child_tow.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:orientation="vertical">

    <TextView
        android:id="@+id/textView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:text="Child_Fragment_Tow"/>
</LinearLayout>

ChildTowFragment.java

import android.support.v4.app.Fragment;
...

public class ChildTowFragment extends Fragment {
    public static ChildTowFragment newInstance() {
        return new ChildTowFragment();
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }


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

        return fv;
    }
}

참고 사이트