Fragment를 이용한 sub화면 전환

1. Empty Activity 프로젝트 생성

 

2. 프로젝트에서 마우스 우클릭 > New > Layout Resource File > fragment_top.xml 입력

3. 2번에서 생성한 Layout 변경

  1) Layout : Linear Layout(orientation : vertical)

  2) 상단에 Plain Text

  3) 하단에 Linear Layout (orientation : horizontal) - 버튼 5개

4. java class 추가 : TopFragment.java

5. fragment_bottom_all.xml Layout 생성

  * TextView 추가

    - Text : "전체화면"

    - TextSize : 30sp

 

6. 같은 방법으로 layout들을 추가한다

  1) fragment_bottom_1.xml

  2) fragment_bottom_2.xml

  3) fragment_bottom_3.xml

  4) fragment_bottom_4.xml

7. 생성한 layout들과 연결될 java class를 생성함

1) TopFragment.java

public class TopFragment extends Fragment {

    @Override
    public void onAttach(@NonNull Context context) {
        super.onAttach(context);
    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        //return super.onCreateView(inflater, container, savedInstanceState);

        //Layout xml과 연결
        ViewGroup rootView = (ViewGroup)inflater.inflate(R.layout.fragment_top, container, false);

        Button btnAll = rootView.findViewById(R.id.btnAll);
        btnAll.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                MainActivity mainActivity = (MainActivity)getActivity();
                if(mainActivity != null)
                    mainActivity.FragmentChange(0);
            }
        });
        Button btn1 = rootView.findViewById(R.id.btn1);
        btn1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                MainActivity mainActivity = (MainActivity)getActivity();
                if(mainActivity != null)
                    mainActivity.FragmentChange(1);
            }
        });
        Button btn2 = rootView.findViewById(R.id.btn2);
        btn2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                MainActivity mainActivity = (MainActivity)getActivity();
                if(mainActivity != null)
                    mainActivity.FragmentChange(2);
            }
        });
        Button btn3 = rootView.findViewById(R.id.btn3);
        btn3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                MainActivity mainActivity = (MainActivity)getActivity();
                if(mainActivity != null)
                    mainActivity.FragmentChange(3);
            }
        });
        Button btn4 = rootView.findViewById(R.id.btn4);
        btn4.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                MainActivity mainActivity = (MainActivity)getActivity();
                if(mainActivity != null)
                    mainActivity.FragmentChange(4);
            }
        });
        return rootView;
    }
}

2) BottomAllFragment.java

public class BottomAllFragment extends Fragment {
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        //return super.onCreateView(inflater, container, savedInstanceState);
        ViewGroup rootView = (ViewGroup)inflater.inflate(R.layout.fragment_bottom_all, container, false);

        return rootView;
    }
}

3) Bottom1Fragment.java

public class Bottom1Fragment extends Fragment {
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        //return super.onCreateView(inflater, container, savedInstanceState);
        ViewGroup rootView = (ViewGroup)inflater.inflate(R.layout.fragment_bottom_1, container, false);

        return rootView;
    }
}

4) Bottom2Fragment.java

public class Bottom2Fragment extends Fragment {
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        //return super.onCreateView(inflater, container, savedInstanceState);
        ViewGroup rootView = (ViewGroup)inflater.inflate(R.layout.fragment_bottom_2, container, false);

        return rootView;
    }
}

5) Bottom3Fragment.java

public class Bottom3Fragment extends Fragment {
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        //return super.onCreateView(inflater, container, savedInstanceState);
        ViewGroup rootView = (ViewGroup)inflater.inflate(R.layout.fragment_bottom_3, container, false);

        return rootView;
    }
}

6) Bottom4Fragment.java

public class Bottom4Fragment extends Fragment {
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        //return super.onCreateView(inflater, container, savedInstanceState);
        ViewGroup rootView = (ViewGroup)inflater.inflate(R.layout.fragment_bottom_4, container, false);

        return rootView;
    }
}

 

8. MainActivity를 다음과 같이 코딩한다

 

1) MainActivity.java

public class MainActivity extends AppCompatActivity {

    private FragmentManager fragmentManager;
    private Fragment[] fragments;

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

        fragmentManager = (FragmentManager)getSupportFragmentManager();
        fragments = new Fragment[5];
        fragments[0] = new BottomAllFragment();
        fragments[1] = new Bottom1Fragment();
        fragments[2] = new Bottom2Fragment();
        fragments[3] = new Bottom3Fragment();
        fragments[4] = new Bottom4Fragment();

        FragmentChange(0);

    }

    public void FragmentChange(int idx)
    {
        if(idx >=0 && idx < 5)
        {
            fragmentManager.beginTransaction().replace(R.id.bottom_container, fragments[idx]).commit();
        }
    }
}

2) activity_main.xml

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


    <FrameLayout
        android:id="@+id/top_container"
        android:layout_width="match_parent"
        android:layout_height="100dp">
        <fragment
            android:id="@+id/topFragment"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:name="org.hdongle.tab2test.TopFragment">
        </fragment>
    </FrameLayout>

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