Fragment 예제

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=".MainActivity3">

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

        <Button
            android:id="@+id/btnSong"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="음악별"/>

        <Button
            android:id="@+id/btnArtist"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="가수별"/>

        <Button
            android:id="@+id/btnAlbum"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="앨범별"/>
    </LinearLayout>
    <LinearLayout
        android:id="@+id/fragment_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"/>

</LinearLayout>

 

song.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"
    android:background="#00ff00"
    tools:context=".SongFragment">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="Song Fragment"
        android:layout_gravity="center"
        android:textColor="#ffffff"/>
    
</FrameLayout>

 

artist.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"
    android:background="#ff0000"
    tools:context=".ArtistFragment">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="Artist Fragment"
        android:layout_gravity="center"
        android:textColor="#ffffff"/>

</FrameLayout>

 

album.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"
    android:background="#334455"
    tools:context=".AlbumFragment">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="Album Fragment"
        android:layout_gravity="center"
        android:textColor="#ffffff"/>

</FrameLayout>

 

main.activity

public class MainActivity3 extends AppCompatActivity implements View.OnClickListener{
        Button btnSong, btnArtist, btnAlbum;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main3);

        btnSong = findViewById(R.id.btnSong);
        btnArtist = findViewById(R.id.btnArtist);
        btnAlbum = findViewById(R.id.btnAlbum);

        btnSong.setOnClickListener(this::onClick);
        btnArtist.setOnClickListener(this::onClick);
        btnAlbum.setOnClickListener(this::onClick);
    }

    @Override
    public void onClick(View view) {
        Fragment fr = null;
        if(view.getId() == R.id.btnSong){
            fr  = new SongFragment();

        } else if (view.getId() == R.id.btnAlbum) {
            fr = new AlbumFragment();

        } else if (view.getId() == R.id.btnArtist) {
            fr = new ArtistFragment();
        }
        //첫번째 방법
//        FragmentManager fragmentManager = getSupportFragmentManager();
//        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
//        fragmentTransaction.replace(R.id.fragment_container, fr);
//        fragmentTransaction.addToBackStack(null);
//        fragmentTransaction.commit();

        //두번째 방법
        getSupportFragmentManager().
                beginTransaction().
                replace(R.id.fragment_container, fr).
                addToBackStack(null).
                commit();
    }

 

Fragment 파일을 생성한 후 작업 해준다.

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결과 값