Map<String, String>的資料處理以及ListView的擴充卡

Map<String, String> map = new HashMap<String, String>();
  map.put("key1", "value1");
  map.put("key2", "value2");
  map.put("key3", "value3");
  
  //第一種：普遍使用，二次取值
  System.out.println("通過Map.keySet周遊key和value：");
  for (String key : map.keySet()) {
   System.out.println("key= "+ key + " and value= " + map.get(key));
  }
  
  //第二種
  System.out.println("通過Map.entrySet使用iterator周遊key和value：");
  Iterator<Map.Entry<String, String>> it = map.entrySet().iterator();
  while (it.hasNext()) {
   Map.Entry<String, String> entry = it.next();
   System.out.println("key= " + entry.getKey() + " and value= " + entry.getValue());
  }
  
<span style="color:#FF0000;">  //第三種：推薦，尤其是容量大時</span>
  System.out.println("通過Map.entrySet周遊key和value");
  for (Map.Entry<String, String> entry : map.entrySet()) {
   System.out.println("key= " + entry.getKey() + " and value= " + entry.getValue());
  }

  //第四種
  System.out.println("通過Map.values()周遊所有的value，但不能周遊key");
  for (String v : map.values()) {
   System.out.println("value= " + v);
  }      

public class HashMapAdapter extends BaseAdapter {

    private HashMap<String, String> mData = new HashMap<String, String>();
    private String[] mKeys;
    public HashMapAdapter(HashMap<String, String> data){
        mData  = data;
        mKeys = mData.keySet().toArray(new String[data.size()]);
    }

    @Override
    public int getCount() {
        return mData.size();
    }

    @Override
    public Object getItem(int position) {
        return mData.get(mKeys[position]);
    }

    @Override
    public long getItemId(int arg0) {
        return arg0;
    }

    @Override
    public View getView(int pos, View convertView, ViewGroup parent) {
        String key = mKeys[pos];
        String Value = getItem(pos).toString();

        //do your view stuff here

        return convertView;
    }
}