Android笔记：获取屏幕信息

像素密度（dpi）

float xdpi = getResources().getDisplayMetrics().xdpi;
float ydpi = getResources().getDisplayMetrics().ydpi;
Log.d("MainActivity", "xdpi is " + xdpi);
Log.d("MainActivity", "ydpi is " + ydpi);

屏幕长宽（px）

float xpx = getResources().getDisplayMetrics().widthPixels;
float ypx = getResources().getDisplayMetrics().heightPixels;
Log.d("MainActivity", "xpx is " + xpx);
Log.d("MainActivity", "ypx is " + ypx);