Question

I am trying to make an application for android and I think I need to make the program get one (X,Y) value for one point and then another after another click so that way I can draw a line between the two points that the user clicks. If there is a better way to get X,Y information, then I would like to know. Thank you.

final View touchView = findViewById(R.id.touchView);
touchView.setOnTouchListener(new View.OnTouchListener() {
    @Override         
    public boolean onTouch(View v, MotionEvent event) { 
        String.valueOf(event.getX() + String.valueOf(event.getY()));
        double x = event.getX();
        double y = event.getY();
        return true;
    }
}); 

Answer 1

I’d do something like this…

public class MyActivity extends Activity
    implements View.OnTouchListener {

    int touchCount = 0;
    double startX, startY, endX, endY;
    View touchView = null;
    ...

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Set content view on the next line to whatever your
        // layout XML file is. For example main.xml
        setContentView(R.layout.main);
        touchView = findViewById(R.id.touchView);
        touchView.setOnTouchListener(this);
    }

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        if (v.equals(touchView)) {
            if (touchCount == 0) {
                startX = event.getX();
                startY = event.getY();
                touchCount++;
            }
            else {
                endX = event.getX();
                endY = event.getY();
                touchCount = 0;
                DrawLine();
            }
            return true;
        }
        return false;
    }

    private void DrawLine() {
        // Process the start / end X,Y points to draw a line here
    }
}