Android：获取屏幕宽度

方法一：

WindowManager wm = this.getSystemService(Context.WINDOW_SERVICE);
int width = wm.getDefaultDisplay().getWidth();
int height = wm.getDefaultDisplay().getHeight();

方法二：

WindowManager wm1 = this.getWindowManager();
int width1 = wm1.getDefaultDisplay().getWidth();
int height1 = wm1.getDefaultDisplay().getHeight();

方法一与方法二获取屏幕宽度的方法类似，只是获取WindowManager 对象时的途径不同。

方法三：

WindowManager manager = this.getWindowManager();
DisplayMetrics outMetrics = new DisplayMetrics();
manager.getDefaultDisplay().getMetrics(outMetrics);
int width2 = outMetrics.widthPixels;
int height2 = outMetrics.heightPixels;

方法四：

Resources resources = this.getResources();
DisplayMetrics dm = resources.getDisplayMetrics();
float density1 = dm.density;
int width3 = dm.widthPixels;
int height3 = dm.heightPixels;