android 信手记 spinner使用

android 随手记 spinner使用

1，第一步  layout

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/spinnerText"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" >
    </TextView>

    <Spinner
        android:id="@+id/Spinner01"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" >
    </Spinner>

</LinearLayout>

2：第二步代码

package com.example.testspinner;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;

public class SpinnerActivity extends Activity {
    
    private static final String[] m={"A型","B型","O型","AB型","其他"};
    
    private TextView view ;
    private Spinner spinner;
    private ArrayAdapter<String> adapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        view = (TextView) findViewById(R.id.spinnerText);
        spinner = (Spinner) findViewById(R.id.Spinner01);
        //将可选内容与ArrayAdapter连接起来
        adapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,m);
        
        //设置下拉列表的风格
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        
        //将adapter 添加到spinner中
        spinner.setAdapter(adapter);
        
        //添加事件Spinner事件监听  
        spinner.setOnItemSelectedListener(new SpinnerSelectedListener());
        
        //设置默认值
        spinner.setVisibility(View.VISIBLE);
        
    }
    
    //使用数组形式操作
    class SpinnerSelectedListener implements OnItemSelectedListener{

        public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
                long arg3) {
            view.setText("你的血型是："+m[arg2]);
        }

        public void onNothingSelected(AdapterView<?> arg0) {
        }
    }
}