Android控件之Spinner探究

以下模拟下拉列表的用法

布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:id="@+id/LinearLayout01"
    android:layout_width="fill_parent" android:layout_height="fill_parent"
    android:orientation="vertical"
    xmlns:android="http://schemas.android.com/apk/res/android">
    <TextView android:text="@string/ys" 
        android:id="@+id/TextView01"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" 
        android:textSize="28dip" />
    <Spinner android:id="@+id/Spinner01"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />
</LinearLayout>

SpinnerActivity类

package com.ljq.sp;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.AdapterView.OnItemSelectedListener;

public class SpinnerActivity extends Activity {
    private Spinner sp = null;//下拉列表
    private TextView tv = null;
    // 所有资源图片的数组
    private int[] drawableIds={R.drawable.football,R.drawable.basketball,R.drawable.volleyball};
    // 所有字符串的数组
    private int[] msgIds={R.string.zq,R.string.lq,R.string.pq};
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        tv = (TextView) findViewById(R.id.TextView01);
        sp=(Spinner)this.findViewById(R.id.Spinner01);//初始化Spinner
        sp.setAdapter(adapter);
        sp.setOnItemSelectedListener(new OnItemSelectedListener() {
            public void onItemSelected(AdapterView<?> parent, View view, int positon, long id) {
                LinearLayout ll = (LinearLayout) view;
                View v=ll.getChildAt(0);//获取第一个控件ImageView
                Log.i("ljq", v.getClass().getName());
                TextView tvn = (TextView) ll.getChildAt(1);//获取第二个控件TextView
                StringBuilder sb = new StringBuilder();
                sb.append(getResources().getText(R.string.ys)).append(":").append(tvn.getText());
                tv.setText(sb.toString());
            }

            public void onNothingSelected(AdapterView<?> parent) {

            }
        });
    }
    
    private BaseAdapter adapter = new BaseAdapter(){
        public int getCount() {
            return drawableIds.length;
        }
        
        public Object getItem(int position) {
            return drawableIds[position];
        }
        
        public long getItemId(int position) {
            return position;
        }
        
        public View getView(int position, View convertView, ViewGroup parent) {
            LinearLayout ll = new LinearLayout(SpinnerActivity.this);
            ll.setOrientation(LinearLayout.HORIZONTAL);
            
            ImageView iv = new ImageView(SpinnerActivity.this);
            iv.setImageResource(drawableIds[position]);
            ll.addView(iv);
            
            TextView tv=new TextView(SpinnerActivity.this);
            tv.setText(msgIds[position]);//设置内容
            tv.setTextSize(24);
            tv.setTextColor(R.color.black);
            ll.addView(tv);
            return ll;
        }
    };
}

运行结果