Rect frame = new Rect();

getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);

int statusBarHeight = frame.top; 

android:layout_width="?attr/actionBarSize"

android:layout_height="?attr/actionBarSize"

DisplayMetrics dm = new DisplayMetrics();  

this.getWindowManager().getDefaultDisplay().getMetrics(dm);//this指当前activity  

screenWidth =dm.widthPixels;  

screenHeight =dm.heightPixels;