android line draw

Question

I want to draw lines on the screen but my application is drawing only dotted. So what should I add in my code?

List<Point> points = new ArrayList<Point>();
Paint paint = new Paint();

public DrawView(Context context) {
    super(context);
    setFocusable(true);
    setFocusableInTouchMode(true);

    this.setOnTouchListener(this);

    paint.setColor(Color.BLUE);
    paint.setAntiAlias(true);
}

@Override
public void onDraw(Canvas canvas) {
    for (Point point : points) {
        canvas.drawCircle(point.x, point.y, 5, paint);
        // Log.d(TAG, "Painting: "+point);
    }
}

public boolean onTouch(View view, MotionEvent event) {
    // if(event.getAction() != MotionEvent.ACTION_DOWN)
    // return super.onTouchEvent(event);
    Point point = new Point();
    point.x = event.getX();
    point.y = event.getY();
    points.add(point);
    invalidate();
    Log.d(TAG, "point: " + point);
    return true;
    }
}

class Point 
{
    float x, y;
    @Override
    public String toString() {
        return x + ", " + y;
    }
}

Check this: [How to draw a line in android](http://stackoverflow.com/questions/3616676/how-to-draw-a-line-in-android) it can help you. — Simon Dorociak, May 22 '12 at 09:20

score 0 · Answer 1 · edited May 22 '12 at 09:48

0

Edit

Use drawLine or drawPath instead of drawCircle.

I would suggest you to take a look on the Fingerpaint example of the API Demos

edited May 22 '12 at 09:48

Praveenkumar

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answered May 22 '12 at 09:19

Andreas Ka

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This shouldn't be an answer,but a comment. – Kazekage Gaara May 22 '12 at 09:28

score 0 · Answer 2 · answered May 22 '12 at 10:02

0

Use drawLine bewteen 2 sets of points
For smoother lines, get all the historic events in onTouch and process them first
for faster/smoother, invalidate only the rect where points have changes

android line draw

2 Answers2