首先是MainActivity

 

package com.example.spinnertest;import java.util.ArrayList;import java.util.List;import android.os.Bundle;import android.app.Activity;import android.content.Context;import android.text.TextUtils;import android.view.LayoutInflater;import android.view.Menu;import android.view.View;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.AdapterView.OnItemSelectedListener;import android.widget.ArrayAdapter;import android.widget.Spinner;import android.widget.TextView;import com.example.spinnertest.R;public class MainActivity extends Activity {    private Spinner myS;     private List
     
       datas=new ArrayList
      
       ();    private MySpinnerAdapter sAdapter;    private String value;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        myS = (Spinner)findViewById(R.id.spinnerS);        initData();        sAdapter = new MySpinnerAdapter(this,datas);        myS.setAdapter(sAdapter);        refreshShowView();        myS.setOnItemSelectedListener(new OnItemSelectedListener() {            @Override            public void onItemSelected(AdapterView
        arg0, View arg1,                    int arg2, long arg3) {                // TODO Auto-generated method stub                value = sAdapter.getItem(arg2);            }            @Override            public void onNothingSelected(AdapterView
        arg0) {                // TODO Auto-generated method stub                            }        });    }    private void initData() {        // TODO Auto-generated method stub        datas.add("a");        datas.add("b");        datas.add("c");        datas.add("d");        datas.add("e");        datas.add("f");        value = datas.get(4);    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }        class MySpinnerAdapter extends  ArrayAdapter
       
         {        private List
        
          mList;        private Context mContext;        class ViewHolder {            public TextView spinnerTv;            public ViewHolder(View v){                spinnerTv = (TextView)v.findViewById(R.id.spinner_tv);            }        }        public MySpinnerAdapter(Context context,  List
         
           list) {            super(context,R.layout.spinner_item,R.id.spinner_tv, list);            // TODO Auto-generated constructor stub            setData(list);            mContext = context;        }        public void setData(List
          
            list){ mList = list; notifyDataSetChanged(); } @Override public int getCount() { // TODO Auto-generated method stub if(mList==null){ return 0; } return mList.size(); } @Override public String getItem(int position) { // TODO Auto-generated method stub if(mList==null){ return null; } return mList.get(position); } @Override public long getItemId(int position) { // TODO Auto-generated method stub return position; } @Override public View getDropDownView(int position, View convertView, ViewGroup parent) { ViewHolder holder = null; if(convertView==null){ convertView = LayoutInflater.from(mContext).inflate( R.layout.spinner_item, null); holder= new ViewHolder(convertView); convertView.setTag(holder); }else{ holder = (ViewHolder)convertView.getTag(); } String myListItem = mList.get(position); holder.spinnerTv.setText(myListItem); return convertView; } } private void refreshShowView(){ if(!TextUtils.isEmpty(value)){ int i = 0; for(String item:datas){ if(value.equals(item)){ break; } i++; } if(i==datas.size()){ i = datas.size()-1; } myS.setSelection(i); } };}
          
         
        
       
      
     

然后是activity_main.xml

然后是spinner_item: