Get Screen Size Pixels per Inch Android example ?

The exact physical pixels per inch of the screen,Get size of pixel,Get DPI,Get count of pixels per inch

float mXDpi;
float mYDpi;
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
mXDpi = metrics.xdpi; // The exact physical pixels per inch of the screen in the X dimension.
 mYDpi = metrics.ydpi;
float  mMetersToPixelsX = mXDpi / 0.0254f; // 1 inch == 0.0254 metre
float  mMetersToPixelsY = mYDpi / 0.0254f;