public class MainActivity extends AppCompatActivity {
    FrameLayout container;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main); //전체화면 inflation
        container = (FrameLayout)findViewById(R.id.container); //id:container으로 FrameLayout찾아 container에대입
        Button button = (Button)findViewById(R.id.button); //id:button으로 Button찾아 button에대입
        button.setOnClickListener(new View.OnClickListener() {//버튼 클릭시 부분 inflation 되게 설정
            @Override
            public void onClick(View v) {
                LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
//LAYOUT_INFLATER_SERVICE으로 부분inflation 한 뒤 inflater에 대입
                inflater.inflate(R.layout.sub1, container, true);//inflater의 inflate함수로 부분화면xml이 container에 붙게 함
            }
        });
    }
}