Android 仿淘宝商品属性标签页

需求

1.动态加载属性，如尺码，颜色，款式等

　　由于每件商品的属性是不确定的，有的商品的属性是颜色和尺码，有的是口味，有的是大小，所以这些属性不能直接写死到页面上。

2.动态加载属性下的标签

　　每个属性下的标签个数也不是一定的，比如有的商品的尺码是是S,M,XL，有的是均码，也就是每种属性的具体的内容是不一定的。

技术点

自定义ViewGroup，使其中的TextView可以依据内容长短自动换行，如下图所示

实现

布局

通过ListView来显示商品所有属性，每种属性作为ListView的Item。

<span style="font-family: Arial, Verdana, sans-serif;">自定义ViewGroup</span>

普通的LinearLayout只能横向和纵向显示控件，但是当一行显示不够时，无法自动换行，需要我们自定义布局容器。

<code class="hljs java">package jczb.shoping.common;
import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
public class MyViewGroup extends ViewGroup {
  private final static int VIEW_MARGIN=15;
  public MyViewGroup(Context context, AttributeSet attrs){
   super(context, attrs);
  }
  public MyViewGroup(Context context) {
   super(context);
  }
  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
  int stages = 1;
  int stageHeight = 0;
  int stageWidth = 0;
  int wholeWidth = MeasureSpec.getSize(widthMeasureSpec);
  for (int i = 0; i < getChildCount(); i++) {
   final View child = getChildAt(i);
   // measure
   measureChild(child, widthMeasureSpec, heightMeasureSpec);
   stageWidth += (child.getMeasuredWidth() + VIEW_MARGIN);
   stageHeight = child.getMeasuredHeight();
   if (stageWidth >= wholeWidth) {
    stages++;
    //reset stageWidth
    stageWidth = child.getMeasuredWidth();
   }
  }
  int wholeHeight = (stageHeight + VIEW_MARGIN) * stages;
  // report this final dimension
  setMeasuredDimension(resolveSize(wholeWidth, widthMeasureSpec),
    resolveSize(wholeHeight, heightMeasureSpec));
  }
  private int jiange = 10;//按钮之间的间隔
  @Override
  protected void onLayout(boolean arg0, int arg1, int arg2, int arg3, int arg4) {
   final int count = getChildCount();
   int row=0;// which row lay you view relative to parent
   int lengthX=arg1 ; // right position of child relative to parent
   int lengthY=arg2; // bottom position of child relative to parent
   for(int i=0;i<count;i++){ final="" view="" child="this.getChildAt(i);" int="" width="child.getMeasuredWidth();" height="child.getMeasuredHeight();" if(i="=" 0){="" lengthx+="width+VIEW_MARGIN;//第一个的时候不需要加" }else{="" +jiange;="" 按钮之间的间隔="" }="" lengthy="row*(height+VIEW_MARGIN)+VIEW_MARGIN+height+arg2;" if="" it="" can't="" drawing="" on="" a="" same="" line="" ,="" skip="" to="" next="" if(lengthx="">arg3){
     lengthX=width+VIEW_MARGIN+arg1;
     row++;
     lengthY=row*(height+VIEW_MARGIN)+VIEW_MARGIN+height+arg2;
    }
    child.layout(lengthX-width, lengthY-height, lengthX, lengthY);
   }
  }
}
</code>

ListView的Adapter

<code class="hljs java">package jczb.shoping.adapter;
import java.util.ArrayList;
import java.util.HashMap;
import jczb.shoping.common.MyViewGroup;
import jczb.shoping.ui.R;
import android.content.Context;
import android.graphics.Color;
import android.graphics.drawable.Drawable;
import android.os.Handler;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;
import android.widget.TableLayout;
import android.widget.TextView;
public class PropertyAdapter extends BaseAdapter {
 private Context mContext;
 private ArrayList<hashmap<string,object>> mList;
 private ArrayList<hashmap<string,textview[]>> mViewList;
 private Drawable drawableNormal ;
 private Drawable drawablePressed;
 private Handler mHandler;
 //用于保存用户的属性集合
 private HashMap<string,string> selectProMap=new HashMap<string, string="">();
 /**
  * 返回选中的属性
  * @return
  */
 public HashMap<string, string=""> getSelectProMap() {
  return selectProMap;
 }
 public void setSelectProMap(HashMap<string, string=""> selectProMap) {
  this.selectProMap = selectProMap;
 }
 public PropertyAdapter(Handler handler,Context context,ArrayList<hashmap<string,object>> list){
  super();
  this.mHandler=handler;
  this.mContext=context;
  this.mList=list;
  mViewList=new ArrayList<hashmap<string,textview[]>>();
  drawableNormal=mContext.getResources().getDrawable(R.drawable.tv_property_label);
 }
 @Override
 public int getCount() {
  // TODO Auto-generated method stub
  return mList.size();
 }
 @Override
 public Object getItem(int position) {
  // TODO Auto-generated method stub
  return mList.get(position);
 }
 @Override
 public long getItemId(int position) {
  // TODO Auto-generated method stub
  return position;
 }
 @Override
 public View getView(int position, View convertView, ViewGroup parent) {
  ViewHolder holder = null;
  if (convertView == null) {
   // 获取list_item布局文件的视图
   convertView = LayoutInflater.from(this.mContext).inflate(R.layout.lv_property_item, null,true);
   holder = new ViewHolder();
   // 获取控件对象
   holder.tvPropName= (TextView) convertView
     .findViewById(R.id.tv_property_name);
   //holder.llPropContents=(LinearLayout)convertView.findViewById(R.id.ll_property_content);
   //holder.tlPropContents=(TableLayout)convertView.findViewById(R.id.ll_property_content);
   // 设置控件集到convertView
   holder.vgPropContents= (MyViewGroup) convertView.findViewById(R.id.myviewgroup);
   convertView.setTag(holder);
  } else {
   holder = (ViewHolder) convertView.getTag();
  }
  if (this.mList != null) {
   //HashMap<string,textview[]> mapView=new HashMap<string,>();
   ArrayList<string> lables = (ArrayList<string>) this.mList.get(position).get("lable");
   String type = (String) this.mList.get(position).get(
     "type");
   holder.tvPropName.setText(type);//规格名称
   //动态加载标签
   //判断布局中的子控件是否为0，如果不为0，就不添加了，防止ListView滚动时重复添加
   if(holder.vgPropContents.getChildCount()==0){
    TextView[] textViews = new TextView[lables.size()];
    //设置每个标签的文本和布局
    //TableRow tr=new TableRow(mContext);
     for (int i = 0; i < lables.size(); i++) {
      TextView textView = new TextView(mContext);      textView.setGravity(17);
      textView.setPadding(25,15,25,15);
      textViews[i] = textView;
      textViews[i].setBackgroundResource(R.drawable.tv_property_label);
      textViews[i].setText(lables.get(i));
      textViews[i].setTag(i);
      //textViews[i].setBackgroundColor(Color.parseColor("#EE5500"));
      //tr.addView(textViews[i]);
     // holder.llPropContents.addView(textViews[i]);
      holder.vgPropContents.addView(textViews[i]);
     }
     //holder.tlPropContents.addView(tr);
     //绑定标签的Click事件
     for(int j=0;j<textviews.length;j++){ string="" void="" viewholder="" view="" v="(TextView)" tv="(TextView)v;" this.type="type;" textviews="(TextView[])v.getTag();" textview="" tablelayout="" return="" public="" private="" override="" new="" myviewgroup="" linearlayout="" lableclicklistener="" int="" implements="" i="0;i<textViews.length;i++){" h="0;h<holder.vgPropContents.getChildCount();h++){" code=""></textviews.length;j++){></string></string></string,></string,textview[]></hashmap<string,textview[]></hashmap<string,object></string,></string,></string,></string,string></hashmap<string,textview[]></hashmap<string,object></code>

总结

　　这里关键就是实现自定义的ViewGroup，重写onMeasure和onLayout方法，判断新添加的控件有没有超出屏幕的宽度来决定是否要换行。

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