android 动态设置margin

代码中不能直接给控件设置margin属性，可以通过layoutParam来设置

这里是用ConstraintLayout布局

布局xml：

<?xml version="1.0" encoding="utf-8"?>

后台代码：

        WindowManager wm = (WindowManager) this                .getSystemService(Context.WINDOW_SERVICE);        int width = wm.getDefaultDisplay().getWidth();        int height = wm.getDefaultDisplay().getHeight();                //遍历界面上的控件         ConstraintLayout rootView = (ConstraintLayout)findViewById(R.id.rootView);        for (int i = 0; i < rootView.getChildCount(); i++) {            View v=rootView.getChildAt(i);            ConstraintLayout.LayoutParams layoutParam =(ConstraintLayout.LayoutParams)v.getLayoutParams();            switch(height)            {                case 800:                    //指定控件类型设置                    if( !(v instanceof HorizontalScrollView)&&!(v instanceof ListView))                        layoutParam.height = dip2px(this, 40);                    else                        layoutParam.height = dip2px(this, 100);                    if(i==0||i==1)//设置第一和第二个控件topMargin                        layoutParam.topMargin=dip2px(this, 10);                    break;                case 1520:                    if( !(v instanceof HorizontalScrollView)&&!(v instanceof ListView))                        layoutParam.height = dip2px(this, 50);                    else                        layoutParam.height = dip2px(this, 200);                    if(i==0||i==1)                        layoutParam.topMargin=dip2px(this, 33);                    break;                default:                    break;            }        }//db转换为pxint dip2px(Context context, float dpValue) {    final float scale = context.getResources().getDisplayMetrics().density;    return (int) (dpValue * scale + 0.5f);}

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