Handling single touch event in Android 안드로이드 싱글 터치 이벤트

It describes how to use the touch API in Android applications.

public class MainActivity extends AppCompatActivity {
 
    int x, y;
    TextView textView;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        x = -1;
        y = -1;
        textView = findViewById(R.id.textView);
    }
 
    @Override
    public boolean onTouchEvent(MotionEvent event) {
 
        switch (event.getAction())
        {
            case MotionEvent.ACTION_DOWN:
                x = Math.round(event.getX());
                y = Math.round(event.getY());
                textView.setText("Down position: " + x + ", " + y);
                break;
 
            case MotionEvent.ACTION_MOVE:
                x = Math.round(event.getX());
                y = Math.round(event.getY());
                textView.setText("Move position: " + x + ", " + y);
                break;
 
            case MotionEvent.ACTION_UP:
                x = Math.round(event.getX());
                y = Math.round(event.getY());
                textView.setText("Up position: " + x + ", " + y);
                break;
 
            default:
                break;
        }
 
        return super.onTouchEvent(event);
    }

Run the app and touch the panel.