判断安卓设备是否手机

    public  boolean isPad(){
      //  WindowManager wm= (WindowManager) getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics dm=new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(dm);

       // Display display=wm.getDefaultDisplay();

        //屏幕宽度
        float screenWidth=dm.widthPixels;

        float screenHeight=dm.heightPixels;


        double x=Math.pow(dm.widthPixels/dm.xdpi,2);
        double y=Math.pow(dm.heightPixels/dm.ydpi,2);

        double screenInches=Math.sqrt(x+y);

        //大于7寸就是平板
        if(screenInches>=7.0){
            return  true;
        }

        return false;
    }