步步为营_Android开发课[28]_用户界面之Spinner（下拉列表）

Focus on technology, enjoy life！—— QQ：804212028
浏览链接：http://blog.csdn.net/y18334702058/article/details/44624305

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• 主题：用户界面之Spinner（下拉列表）
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系统自带样式的Spinner下拉列表（实例）：

activity_main.xml：

<?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"    android:id="@+id/mainlayout" >    <Spinner        android:id="@+id/spinner"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        /></LinearLayout>

MainActivity.java:

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.Toast;public class MainActivity extends Activity {    private Spinner spinner;    private final String[] names = {"嘟嘟","蛋蛋","嘟蛋","小嘟蛋","大嘟蛋"};    private ArrayAdapter<String> adapter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        spinner = (Spinner) findViewById(R.id.spinner);        // 将可选内容与ArrayAdapter连接        adapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, names);        // 设置下拉列表风格        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);        // 将adapter添加到spinner中        spinner.setAdapter(adapter);        //添加监听事件        spinner.setOnItemSelectedListener(new OnItemSelectedListener(){            @Override            public void onItemSelected(AdapterView<?> arg0, View arg1,                    int arg2, long arg3) {                // TODO Auto-generated method stub                Toast.makeText(MainActivity.this,"你选择的名字是:" + arg0.getItemAtPosition(arg2).toString(), Toast.LENGTH_LONG).show();            }            @Override            public void onNothingSelected(AdapterView<?> arg0) {                // TODO Auto-generated method stub            }        });    }}

运行结果：

Focus on technology, enjoy life！—— QQ：804212028