Android 仿淘寶商品屬性標簽頁

需求

1.動態加載屬性，如尺碼，顏色，款式等

　　由於每件商品的屬性是不確定的，有的商品的屬性是顏色和尺碼，有的是口味，有的是大小，所以這些屬性不能直接寫死到頁面上。

2.動態加載屬性下的標簽

　　每個屬性下的標簽個數也不是一定的，比如有的商品的尺碼是是S,M,XL，有的是均碼，也就是每種屬性的具體的內容是不一定的。

技術點

自定義ViewGroup，使其中的TextView可以依據內容長短自動換行，如下圖所示

實現

布局

通過ListView來顯示商品所有屬性，每種屬性作為ListView的Item。

<span >自定義ViewGroup</span>

普通的LinearLayout只能橫向和縱向顯示控件，但是當一行顯示不夠時，無法自動換行，需要我們自定義布局容器。

<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;//按鈕之間的間隔
  @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;//第一個的時候不需要加" }else{="" +jiange;="" 按鈕之間的間隔="" }="" 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;
 //用於保存用戶的屬性集合
 private HashMap<string,string> selectProMap=new HashMap<string, string="">();
 /**
  * 返回選中的屬性
  * @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) {
   // 獲取list_item布局文件的視圖
   convertView = LayoutInflater.from(this.mContext).inflate(R.layout.lv_property_item, null,true);
   holder = new ViewHolder();
   // 獲取控件對象
   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);
   // 設置控件集到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);//規格名稱
   //動態加載標簽
   //判斷布局中的子控件是否為0，如果不為0，就不添加了，防止ListView滾動時重復添加
   if(holder.vgPropContents.getChildCount()==0){
    TextView[] textViews = new TextView[lables.size()];
    //設置每個標簽的文本和布局
    //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);
     //綁定標簽的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>

總結

　　這裡關鍵就是實現自定義的ViewGroup，重寫onMeasure和onLayout方法，判斷新添加的控件有沒有超出屏幕的寬度來決定是否要換行。

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