LinearLayout代码实现分行

LinearLayout用代码实现分行

很多时候我们的子view个数不确定时，我们需要通过Java代码将子view添加到父view视图中，如果我们期望横向排列，当超出屏幕宽度后自动换行展示，这样的需求怎么实现呢？

效果：

代码实现 ：

LinearLayout linearLayout = new LinearLayout(this);

02                    linearLayout.setOrientation(LinearLayout.VERTICAL);

03                    LinearLayout.LayoutParams layoutParams = newLinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);

04                    layoutParams.setMargins(0, 20, 0, 20);

05                    linearLayout.setLayoutParams(layoutParams);

06 

07                    LinearLayout newlinearLayout = new LinearLayout(this);

08                    newlinearLayout.setLayoutParams(newLinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT));

09                    newlinearLayout.setOrientation(LinearLayout.HORIZONTAL);

10                    newlinearLayout.setLayoutParams(layoutParams);

11 

12for (Map.Entry skuEntry : skuProperty.getPropertyMap().entrySet()) {

13                        final Long skuId = (Long) skuEntry.getKey();

14                        final SkuPropertyValue propertyValue = (SkuPropertyValue) skuEntry.getValue();

15                        final String skuName = propertyValue.getName();

16                        final Button skuButton = new Button(this);

17                        skuButton.measure(0, 0);

18                        widthSoFar += skuButton.getMeasuredWidth();

19                        if (widthSoFar >= maxWidth) {

20                            linearLayout.addView(newlinearLayout);

21                            newlinearLayout = new LinearLayout(this);

22                            newlinearLayout.setOrientation(LinearLayout.HORIZONTAL);

23                            newlinearLayout.setLayoutParams(layoutParams);

24                            newlinearLayout.addView(skuButton);

25                            widthSoFar = skuButton.getMeasuredWidth();

26                        } else {

27                            newlinearLayout.addView(skuButton);

28                        }

29}

30linearLayout.addView(newlinearLayout);

原理：

首先我们定义一个纵向的LinearLayout 对象，在定义一个横向的LinearLayout ，在for循环中不断向横向的LinearLayout 中加入子view，但是在加入前需要判断，如果累计的宽度大于屏幕的宽度后，需要将此横向LinearLayout 作为子元素加入纵向的LinearLayout ，然后重新new出一个横向的LinearLayout 将view加入其中并重置累计宽度大小，如果累计宽度还是小于屏幕宽度，则继续向横向LinearLayout 加入子view。