需要实现的效果：

思路：

1：LinearLayout里包含LinearLayout里包含LinearLayout里包含LinearLayout 2：RecycleView里包含一层RecycleView 3：自定义ViewGroup

1太小学生，2太麻烦，所以来用3，且代码极其简单，优雅，复用性极高 xml里什么也不用谢，仅需在activity中这么写

private ArrayList<MyChooseBtnView> allChoose=new ArrayList<MyChooseBtnView>(); private void addData(){ allChoose.add(new MyChooseBtnView(getActivity(),new String[]{"新车","二手车","库存车"})); allChoose.add(new MyChooseBtnView(getActivity(),new String[]{"白色","黑色","绿色","蓝色","粉色","白色","灰色"})); allChoose.add(new MyChooseBtnView(getActivity(),new String[]{"1.0L","1.5L","2.0L","2.5L"})); allChoose.add(new MyChooseBtnView(getActivity(),new String[]{"营运","非营运","私家车","公车"})); allChoose.add(new MyChooseBtnView(getActivity(),new String[]{"1万","2万","3万","4万","5万","6万","7万"})); allChoose.add(new MyChooseBtnView(getActivity(),new String[]{"电动","汽油","混合","柴油"})); for(MyChooseBtnView oneChoose:allChoose){ needAdd.addView(oneChoose); } } private ArrayList<String> getAllRes(){ ArrayList<String> res=new ArrayList<String>(); for(MyChooseBtnView oneChoose:allChoose){ res.add(oneChoose.getRes()); } return res; }

addData也可以根据实际情况去动态add， getAllRes()就得出了[“二手车”,“黑色”,“2.5L”,“营运”,“3万”,“电动”]， 把这个结果发给服务器，是不是很优雅？

下面是组件的代码，就一个自定义的ViewGroup：

MyChooseBtnView.java：

public class MyChooseBtnView extends ViewGroup { private int allW=0,allH=0;//viewgroup宽高 private int oneW=0,oneH=0;//子view宽高 private int shu=3;//竖着有几排 private int heng=0;//横着有几排 private int pading=0;//子view间距 private int nowChoose=-1; private String[] datas={}; public MyChooseBtnView(Context context,String[] data) { super(context); oneH= BaseObserver.getInstance().getPXformDP(40); pading=BaseObserver.getInstance().getPXformDP(8); datas=data; for(int i=0;i<datas.length;i++){ addView(getText(context,datas[i],i)); } } public MyChooseBtnView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public MyChooseBtnView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); } //确定viewgroup,以及所有子view的大小 //在这个确定的过程中，就实现了每个子view等分 @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); heng =datas.length/shu+(datas.length%shu==0?0:1); allW=MeasureSpec.getSize(widthMeasureSpec); allH = oneH* heng +pading+pading* heng; oneW=(allW-pading* shu -pading)/ shu; //一定要注意这里的EXACTLY，EXACTLY 一定要与子view对上，比如我这写EXACTLY，子view动态layoutparm就写MATCH_PARENT或XXDP //如果我这写ALMOST，ALMOST 子view动态layoutparm就写WARP_PARENT //不然子view执行measure方法时，就用不到你传过去的宽高 measureChildren(View.MeasureSpec.makeMeasureSpec(oneW, EXACTLY),View.MeasureSpec.makeMeasureSpec(oneH, EXACTLY)); setMeasuredDimension(allW,allH); } //确定viewgroup,以及所有子view的位置 //在这个确定的过程中，就实现了每个子view的位置排列 @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { for (int i = 0; i < getChildCount(); i++) { View textView=getChildAt(i); int var1 = i / shu; int var2 = i % shu; int left = oneW*var2+pading+pading*var2; int top = oneH *var1+pading+pading*var1; int right = left + oneW; int bottom = top + oneH; textView.layout(left, top, right, bottom); } } private TextView getText(Context context,String s,int po){ TextView textView=new TextView(context); textView.setLayoutParams(new ViewGroup.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT)); textView.setTextSize(TypedValue.COMPLEX_UNIT_DIP,15); textView.setBackgroundResource(R.drawable.shape63); textView.setTextColor(0xff8a8a8a); textView.setGravity(Gravity.CENTER); textView.setText(s); textView.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { setNowChoose(po); } }); return textView; } private void setNowChoose(int po){ if(nowChoose!=-1){ TextView textView=(TextView)getChildAt(nowChoose); textView.setBackgroundResource(R.drawable.shape63); textView.setTextColor(0xff8a8a8a); } nowChoose=po; TextView textView=(TextView)getChildAt(nowChoose); textView.setBackgroundResource(R.drawable.shape64); textView.setTextColor(0xffffffff); } public String getRes(){ if(nowChoose!=-1){ return datas[nowChoose]; }else { return null; } } }

重点就是要理解ViewGroup里的onMeasure，onLayout方法

在前者里算出viewGroup的宽高，以及里面所有子view的宽高 在后者里算出所有子view的位置 明白安卓多层级UI的绘制流程，思路清晰，算这东西就不会晕，不会错