Android---Spinner的使用01(选择下拉框Toast显示选择的数据)

Android-Spinner的简单使用，数据是自定义的数组
Xml布局文件:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
tools:context=".MainActivity" >

<Spinner
android:id="@+id/spinner"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>

</LinearLayout>

MainActivity.java文件:

适配器ArrayAdapter的三个参数----->>：当前上下文，引用的布局文件(自定义或者系统的布局文件)，数据集合。

package com.zwb.spinner;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Toast;

public class MainActivity extends Activity {
Spinner spinner;
//创建数组存放数据
String city[] = {"北京市","上海市","天津市","河北省","山东省","浙江省","四川省","河南省","陕西省"};
//定义适配器
ArrayAdapter<String> adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
spinner = (Spinner) findViewById(R.id.spinner);
//定义适配器
adapter = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_spinner_item, city);
//给Spinner设置适配器
spinner.setAdapter(adapter);
//设置spinner的监听事件
spinner.setOnItemSelectedListener(new OnItemSelectedListener() {

@Override
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
//获取选择的
String count = (String) spinner.getItemAtPosition(position);
//吐司显示选中的内容
Toast.makeText(MainActivity.this, "您选择了"+count, Toast.LENGTH_LONG).show();
}

@Override
public void onNothingSelected(AdapterView<?> parent) {
// TODO Auto-generated method stub

}
});

}

@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;
}

}