public class GraphPlotting extends View
    {
    public void onDraw(Canvas canvas)
{

    readPoints();
    Paint paint1 = new Paint();
    paint1.setColor(Color.rgb(0xFF,0xFF, 0xFF));
    paint1.setStrokeWidth(1.0f);

    Paint paint2 = new Paint();
    paint2.setColor(Color.rgb(0xFF,0xFF, 0xFF));
    paint2.setStrokeWidth(10.0f);

    Paint paint = new Paint();
    paint.setStyle(Paint.Style.FILL);
    paint.setColor(Color.RED);
    canvas.drawPaint(paint);

    canvas.drawLines(p,paint1);


}
    public void readPoints()
    {
          DisplayMetrics dm = new DisplayMetrics();
      getWindowManager().getDefaultDisplay().getMetrics(dm);

          height = dm.heightPixels;
      width = dm.widthPixels;

           // drawing graph based on above dimension which in my case is 480 by 800

    }

<RelativeLayout
android:layout_width="200dp"
android:layout_height="200dp"
android:orientation="vertical"
android:layout_below="@+id/btn_analyze"
android:layout_centerHorizontal="true"
android:id="@+id/rlgraph"
 >
<com.aventusoft.mylynel.GraphPlotting

        android:id="@+id/view1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"

 />
</RelativeLayout>

@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {

    widgetHeight = h;
    widgetWidth = w;

    if (sizeChangedObservers != null && sizeChangedObservers.size() > 0) {
        for (SizeChangedObserver observer : sizeChangedObservers) {
            observer.callback(w, h);
        }
    }

    updateIncrements();

}