MainActivity.java

public class MainActivity extends AppCompatActivity {
    private FragmentManager fragmentManager;
    private Fragment_Main fragment_main;
    private Fragment_MyPage fragment_my_page;
    private FragmentTransaction fragmentTransaction;

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

        fragmentManager = getSupportFragmentManager();

        fragment_main = new Fragment_Main();
        fragment_my_page = new Fragment_MyPage();

        fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.replace(R.id.frameLayout, fragment_my_page).commitNowAllowingStateLoss();
    }

    public void MenuClickHandler(View v){
        fragmentManager = getSupportFragmentManager();
        fragmentTransaction = fragmentManager.beginTransaction();

        switch (v.getId()){
            case R.id.btn_main:
                fragmentTransaction.replace(R.id.frameLayout, fragment_main).commitNowAllowingStateLoss();
                break;
            case R.id.btn_my_page:
                fragmentTransaction.replace(R.id.frameLayout, fragment_my_page).commitNowAllowingStateLoss();
                break;
        }
    }
}

 

activity_main.xml

    <FrameLayout
        android:id="@+id/frameLayout"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        app:layout_constraintBottom_toTopOf="@id/linearLayout"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent">

    </FrameLayout>

    <LinearLayout
        android:id="@+id/linearLayout"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:orientation="horizontal"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent">

        <Button
            android:id="@+id/btn_main"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="MenuClickHandler"
            android:layout_weight="1"
            android:text="Main" />

        <Button
            android:id="@+id/btn_my_page"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="MenuClickHandler"
            android:layout_weight="1"
            android:text="MyPage" />
    </LinearLayout>

 

각 Fragment Java

public class Fragment_이름 extends Fragment {
    @Nullable
    @Override
    public View onCreateView(
        @NonNull LayoutInflater inflater,
        @Nullable ViewGroup container,
        @Nullable Bundle savedInstanceState
    ){
        return inflater.inflate(R.layout.fragment_이름, container, false);
    }
}

 

테스트용 Fragment Layout xml

<?xml version="1.0" encoding="utf-8"?>
<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">

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

        <Button
            android:id="@+id/button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="This" />

        <Button
            android:id="@+id/button2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="is" />

        <Button
            android:id="@+id/button3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="a" />

        <Button
            android:id="@+id/button4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Main Page" />
    </LinearLayout>
</LinearLayout>

 

 

결과물

 

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