Android 메뉴 (배경색 변경)

main.java

/*메뉴*/
public class MainActivity extends AppCompatActivity {

    private LinearLayout baseLayout;
    private Button button;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setTitle("배경색 변경");
        baseLayout = findViewById(R.id.baseLayout);
        button = findViewById(R.id.button1);
    }

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

    }

    @Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) {
        if(item.getItemId() == R.id.itemRed){
            baseLayout.setBackgroundColor(Color.RED);
        }else if(item.getItemId() == R.id.itemGreen){
            baseLayout.setBackgroundColor(Color.GREEN);
        }else if(item.getItemId() == R.id.itemBlue){
            baseLayout.setBackgroundColor(Color.BLUE);
        }else if(item.getItemId() == R.id.subRotate){
            button.setRotation(45);
        }else if(item.getItemId() == R.id.subSize){
            button.setScaleX(2);
        }
        return false;
    }
}

 

 

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"
    tools:context=".MainActivity"
    android:orientation="vertical"
    android:id="@+id/baseLayout">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="오른쪽 위 메뉴 버튼을 누르세요"
        android:textSize="20sp"/>
    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="버튼"/>


</LinearLayout>

 

res → menu 폴더 → menu1.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/itemRed"
        android:title="배경색(빨강)">
    </item>
    <item
        android:id="@+id/itemGreen"
        android:title="배경색(초록)">
    </item>
    <item
        android:id="@+id/itemBlue"
        android:title="배경색(파랑)">
    </item>

    <!--아이템안에 메뉴안에 아이템-->
    <item
         android:title="버튼변경">
        <menu>
            <item
                android:id="@+id/subRotate"
                android:title="버튼 45도 회전">

            </item>
            <item
                android:id="@+id/subSize"
                android:title="버튼 2배 확대">

            </item>
        </menu>
    </item>
</menu>

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결과 값