How to draw scalable (change its shape and size)rectangle programatically and not using xml?

Question

I am trying to draw a scalable rectangle and can also change its position ,what I want is to use these square/rectangle coordinate pixels .Any libraries or any suggestions will be extremely useful .I have used this https://stackoverflow.com/a/17807469/6625633 .But failed to do so.

Answer 1

You can do it using canvas:

public class YourView extends View {
   float rectX = 0, rectY = 0, rectWidth = 128, rectHeight = 128;
   int color = 0xFFff00ff, viewWidth, viewHeight;
   Paint p;

   public YourView(Context con) {
      super(con);
      p = new Paint();
      viewWidth = getWindowManager().getDefaultDisplay().getWidth();
      viewHeight = getWindowManager().getDefaultDisplay().getHeight(); // fullscreen view
   }

   @Override
   public void onMeasure(int w, int h) {
      setMeasuredDimension(viewWidth, viewHeight); // view size
   }

   @Override
   public void onDraw(Canvas canvas) {
      p.setColor(color); // rect color
      canvas.drawRect(rectX, rectY, rectX+rectWidth, rectY+rectHeight, p);
      // drawRect(x, y, endX, endY, Paint p)
   }
}

For example:

YourView yv = new YourView(this);
yv.rectX = 64;
yv.rectY = 64;
yv.invalidate(); // update view
// setContentView(yv); // if you want to display only your custom View

You can also move the View around the screen:

Button btn = new Button(this);
btn.post(new Runnable() {
   @Override
   public void run() {
      btn.setX(x);
      btn.setY(y);
   }
});