Android Java- Fragment

Fragment 사용하기

• Fragment 기능
  • Fragment 교체

      FragmentManager fragmentManager = getSupportFragmentManager();
      FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
    		
      fragmentTransaction.replace(int container, Fragment fragment, String tag);
      fragmentTransaction.commit();
    

  • Fragment 삭제

      FragmentManager fragmentManager = getSupportFragmentManager();
      FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
    
      fragmentTransaction.remove(Fragment fragmet);
      fragmentTransaction.commit();
    

  • Fragment 찾기

      FragmentManager fragmentManager = getSupportFragmentManager();
      Fragment fragment = fragmentManager.findFragmentById(R.id.container);
    
      FragmentManager fragmentManager = getSupportFragmentManager();
      Fragment fragment = fragmentManager.findFragmentByTag(TAG);
    

  • Fragment 숨기기

      FragmentManager fragmentManager = getSupportFragmentManager();
      FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
    		
      fragmentTransaction.hide(Fragment fragmet);
      fragmentTransaction.commit();
    

  • Fragment 보이기

      FragmentManager fragmentManager = getSupportFragmentManager();
      FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
    		
      fragmentTransaction.show(Fragment fragmet);
      fragmentTransaction.commit();
    

Activity에 Fragment를 추가하기 위한 방법으로는 xml을 사용하는 방법과 Java 코드에서 SupportFragmentManager을 사용하는 방법이 있습니다.

• xml 사용

  • activity_main.xml

      <?xml version="1.0" encoding="utf-8"?>
      <FrameLayout 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:id="@+id/container"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          tools:context=".MainActivity">
          <fragment
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:name="com.ls.project.practicejava.BlankFragment"/>
      </FrameLayout>
    

  • fragment_blank.xml

      <?xml version="1.0" encoding="utf-8"?>
      <FrameLayout 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"
          tools:context=".BlankFragment">
    
          <TextView
              android:id="@+id/tv"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:text="@string/hello_blank_fragment"/>
      </FrameLayout>
    

  • BlankFragment.java

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

  • MainActivity.java

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

• SupportFragmentManager 사용

  • activity_main.xml

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

  • fragment_blank.xml, BlankFragment.java 변경 x

  • MainActivity.java

     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();
             fragmentTransaction.add(R.id.container,new BlankFragment());
             fragmentTransaction.commit();
         }
     }