Map<String, String> map = new HashMap<String, String>();

  map.put("key1", "value1");

  map.put("key2", "value2");

  map.put("key3", "value3");

  //第一种：普遍使用，二次取值

  System.out.println("通过Map.keySet遍历key和value：");

  for (String key : map.keySet()) {

   System.out.println("key= "+ key + " and value= " + map.get(key));

  }

  //第二种

  System.out.println("通过Map.entrySet使用iterator遍历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;">  //第三种：推荐，尤其是容量大时</span>

  System.out.println("通过Map.entrySet遍历key和value");

  for (Map.Entry<String, String> entry : map.entrySet()) {

   System.out.println("key= " + entry.getKey() + " and value= " + entry.getValue());

  }

  //第四种

  System.out.println("通过Map.values()遍历所有的value，但不能遍历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;

    }

}