[Java][Android] 안드로이드 TextView 클릭시 색깔 변경

<?xml version="1.0" encoding="utf-8"?>
<ScrollView 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">


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


        <TextView
            android:id="@+id/textView"
            android:layout_width="100dp"
            android:layout_height="50dp"
            android:layout_gravity="center"
            android:gravity="center"
            android:text="스틱코드 입니다."
            android:textColor="@color/white"
            android:background="@color/black"/>


    </LinearLayout>


</ScrollView>

public class MainActivity extends AppCompatActivity {

    private TextView textView;
    private Boolean isBlack;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textView = findViewById(R.id.textView);
        isBlack = true;

        textView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(isBlack) {
                    textView.setBackgroundColor(BLUE);
                    isBlack = false;
                }else{
                    textView.setBackgroundColor(BLACK);
                    isBlack = true;
                }
            }
        });


    }


}

전체 코드입니다.