1、導航欄隱藏問題，計算高度出現(xiàn)失誤
老方法：

Context context = getApplicationContext();
DisplayMetrics localDisplayMetrics = context.getResources().getDisplayMetrics(); 
// 獲取高度
int height = localDisplayMetrics.heightPixels;
// 獲取寬度
int width = localDisplayMetrics.widthPixels;

4.2以后采用，可正確計算

Context context = getApplicationContext();
DisplayMetrics dm = new DisplayMetrics();
WindowManager windowMgr = (WindowManager)context.getSystemService(Context.WINDOW_SERVICE);
windowMgr.getDefaultDisplay().getRealMetrics(dm);
// 獲取高度
int height = dm.heightPixels;
// 獲取寬度
int width = dm.widthPixels;