how to set position scaling

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Mobile

Android

Hi All,
How to set my images display at same position in all devices in android?
I am using canvas.
int z1=width/2,int d=height/2;
Point startPoint3 = new Point((int)z1, (int)d);

this._Image.add(new Myimage(this._context, this, startPoint3, 50));

please help me