옵션메뉴, 컨텍스트 메뉴, 대화상자

1) 옵션메뉴

- Java 코드

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

        baseLayout = (LinearLayout) findViewById(R.id.baseLayout);
        button1 = (Button) findViewById(R.id.button1);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);
	MenuInflater mInflater = getMenuInflater();
	mInflater.inflate(R.menu.menu1, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) {

        switch (item.getItemId()) {
	case R.id.itemRed:
		baseLayout.setBackgroundColor(Color.RED);
		return true;
	case R.id.itemGreen:
		baseLayout.setBackgroundColor(Color.GREEN);
		return true;
	case R.id.itemBlue:
		baseLayout.setBackgroundColor(Color.BLUE);
		return true;
	case R.id.subRotate:
		button1.setRotation(45);
		return true;
	case R.id.subSize:
		button1.setScaleX(2);
		return true;
        }
        return false;
    }

-> menu1.xml을 생성하지 않고 Java코드로만 구현

public class MainActivity extends AppCompatActivity {
    LinearLayout baseLayout;
    Button button1;

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

        baseLayout = (LinearLayout) findViewById(R.id.baseLayout);
        button1 = (Button) findViewById(R.id.button1);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);
        menu.add(0, 1, 0, "배경색 (빨강)");
        menu.add(0, 2, 0, "배경색 (초록)");
        menu.add(0, 3, 0, "배경색 (파랑)");
        SubMenu sMenu = menu.addSubMenu("버튼 변경 >>");
        sMenu.add(0, 4, 0, "버튼 45도 회전");
        sMenu.add(0, 5, 0, "버튼 2배 확대");
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) {

        switch (item.getItemId()) {
            case 1:
                baseLayout.setBackgroundColor(Color.RED);
                return true;
            case 2:
                baseLayout.setBackgroundColor(Color.GREEN);
                return true;
            case 3:
                baseLayout.setBackgroundColor(Color.BLUE);
                return true;
            case 4:
                button1.setRotation(45);
                return true;
            case 5:
                button1.setScaleX(2);
                return true;
        }
        return false;
    }
}

 

2) 컨택스트 메뉴(contextMenu) - 버튼을 길게 클릭하면 메뉴가 나옴

public class MainActivity extends AppCompatActivity {
    LinearLayout baseLayout;
    Button button1, button2;
    ImageView imageView1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setTitle("동물 바꾸기(컨텍스트 메뉴)");

        baseLayout = (LinearLayout) findViewById(R.id.baseLayout);
        button1 = (Button) findViewById(R.id.button1);
        registerForContextMenu(button1);

        button2 = (Button) findViewById(R.id.button2);
        registerForContextMenu(button2);

        imageView1 = (ImageView) findViewById(R.id.imageView1);
    }

    @Override
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
        super.onCreateContextMenu(menu, v, menuInfo);
        MenuInflater mInflater = getMenuInflater();
        if (v == button1) {
            menu.setHeaderTitle("동물 선택");

            mInflater.inflate(R.menu.menu1, menu);
        }
        if (v == button2) {
            mInflater.inflate(R.menu.menu2, menu);
        }
    }

    @Override
    public boolean onContextItemSelected(@NonNull MenuItem item) {
        switch (item.getItemId()) {
            case R.id.itemRed:
                baseLayout.setBackgroundColor(Color.RED);
                imageView1.setImageResource(R.drawable.dog3);
                return true;
            case R.id.itemGreen:
                baseLayout.setBackgroundColor(Color.GREEN);
                imageView1.setImageResource(R.drawable.cat1);
                return true;
            case R.id.itemBlue:
                baseLayout.setBackgroundColor(Color.BLUE);
                imageView1.setImageResource(R.drawable.rabbit);
                return true;
            case R.id.subRotate:
                imageView1.setRotation(45);
                return true;
            case R.id.subSize:
                imageView1.setScaleX(2);
                return true;
        }
        return false;
    }
}

 

3) 토스트(Toast) - x와 y좌표에 토스트 메세지 출력하기

inal Button button1 = (Button) findViewById(R.id.button1);

        button1.setOnClickListener(new View.OnClickListener() {

            public void onClick(View v) {

                Toast tMsg = Toast.makeText(MainActivity.this, "토스트 연습",
                        Toast.LENGTH_SHORT);

                Display display = ((WindowManager) getSystemService(WINDOW_SERVICE))
                        .getDefaultDisplay();
                int xOffset = (int) (Math.random() * display.getWidth());
                int yOffset = (int) (Math.random() * display.getHeight());

                tMsg.setGravity(Gravity.TOP | Gravity.LEFT, xOffset, yOffset);
                tMsg.show();
            }
        });

 

4) 기본 대화상자(AlertDialog) - 화면에 메세지를 나타낸 후 확인이나 취소 같은 사용자의 선택을 받아들임

button1.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {

                AlertDialog.Builder dlg = new AlertDialog.Builder(
                        MainActivity.this);
                dlg.setTitle("제목입니다");
                dlg.setMessage("이곳이 내용입니다");
                dlg.setIcon(R.mipmap.ic_launcher);
                dlg.setPositiveButton("확인",
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int which) {
                                Toast.makeText(MainActivity.this,
                                        "확인을 눌렀네요", Toast.LENGTH_SHORT).show();
                            }
                        });
                dlg.show();
            }
        });