对于android项目开发来说，常常会用到Spinner实现下拉框的效果。而对于Spinner加载适配器的方法有多种：
1.直接加载android自带的ArrayAdapter,SimpleAdapter；
2.自定义继承BaseAdapter的适配器。
对于适配器加载自定义的xml布局文件，修改该Spinner样式较简单，就是在定义的xml布局文件中修改显示的样式就可以。但对于加载android自带的xml布局文件，有时会出现不是项目所需要的效果。主要问题有下拉几个：
1.Spinner本身背景显示样式；
2.Spinner中文本框显示样式；
3.Spinner下拉菜单框显示样式；
下面通过实例解决上面提出的几个样式问题：
<span style="font-size:18px;">package com.example.spinnerdemo;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
public class MainActivity extends Activity {
private Spinner spinner;
private Spinner spinnerTwo;
private String[] datas;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
spinner = (Spinner) this.findViewById(R.id.spinner);
spinnerTwo = (Spinner) this.findViewById(R.id.spinnerTwo);
datas = new String[] { "张三", "李四", "王五", "赵六" };
//原生态样式,以android.R.layout.simple_spinner_dropdown_item为例，其他修改类似
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_dropdown_item, datas);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
//根据原生态样式改变而来的自定义样式
//Spinner中文框显示样式
ArrayAdapter<String> adapterTwo = new ArrayAdapter<String>(this,
R.layout.my_simple_spinner_self_item, datas);
//Spinner下拉菜单显示样式
adapterTwo
.setDropDownViewResource(R.layout.my_simple_spinner_dropdown_item);
spinnerTwo.setAdapter(adapterTwo);
}
}
</span>
由MainActivity.java中以android.R.layout.simple_spinner_dropdown_item为例，其中android.R.layout.simple_spinner_dropdown_item系统自身的xml布局文件如下：
<span style="font-size:18px;"><?xml version="1.0" encoding="utf-8"?>
<!--
/* //device/apps/common/assets/res/any/layout/simple_spinner_item.xml
**
** Copyright 2008, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
-->
<CheckedTextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/text1"
style="?android:attr/spinnerDropDownItemStyle"
android:singleLine="true"
android:layout_width="match_parent"
android:layout_height="?android:attr/dropdownListPreferredItemHeight"
android:ellipsize="marquee"
android:textAlignment="inherit"/>
</span>
而我们需要实现上面需要实现的样式，只需在其基础上进行修改就可以了。
1.修改Spinner本身背景色
a. 设置背景色选择器spinner_selector.xml
<span style="font-size:18px;"><?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true" android:drawable="@color/blue" />
<item android:state_focused="true" android:drawable="@color/blue" />
<item android:drawable="@color/white" />
</selector> </span>
b. 颜色设置 color.xml
<span style="font-size:18px;"><resources> <color name="white">#FFFFFF</color> <color name="blue">#0000FF</color> </resources> </span>
c.背景色设置activity_main.xml
<span style="font-size:18px;"><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="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.spinnerdemo.MainActivity$PlaceholderFragment" >
<Spinner
android:id="@+id/spinner"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical" />
<!-- Spinner自身背景色需设置：android:background="@drawable/spinner_selector" -->
<Spinner
android:id="@+id/spinnerTwo"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="50dp"
android:gravity="center_vertical" />
</LinearLayout></span>
2.Spinner中文本显示样式
<span style="font-size:18px;"><?xml version="1.0" encoding="utf-8"?>
<!--
/* //device/apps/common/assets/res/any/layout/simple_spinner_item.xml
**
** Copyright 2008, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
-->
<CheckedTextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/text1"
style="?android:attr/spinnerDropDownItemStyle"
android:textColor="#0000FF"
android:gravity="center"
android:singleLine="true"
android:layout_width="match_parent"
android:layout_height="40dp"
android:ellipsize="marquee"
android:textAlignment="inherit"
android:background="#FFFFFF"/>
</span>
3.Spinner下拉框显示样式
<span style="font-size:18px;"><?xml version="1.0" encoding="utf-8"?>
<!--
/* //device/apps/common/assets/res/any/layout/simple_spinner_item.xml
**
** Copyright 2008, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
-->
<CheckedTextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/text1"
style="?android:attr/spinnerDropDownItemStyle"
android:layout_width="match_parent"
android:layout_height="40dp"
android:background="#00FF00"
android:ellipsize="marquee"
android:gravity="center"
android:singleLine="true"
android:textAlignment="inherit"
android:textColor="#FF0000"
android:textSize="24sp" />
</span>
上面就是Spinner样式设置的所有内容，可以试试看。
源码地址：http://download.csdn.net/detail/a123demi/7931263