android+myeclipse+mysql下拉框数据绑定
原创作品，允许转载，转载时请务必声明作者信息和本声明。http://www.cnblogs.com/zhu520/p/8027036.html
本人小白，那个大神看到有问题可指出，谢谢。。。。
一：我使用的工具 myeclipse ，mysql ，Android studio
二：服务器（后台）myeclipse
=========
========》
1）：先配置先
a: web.xml
这里的 <servlet-mapping> 我多设置一个 <url-pattern>*.json</url-pattern>用来区分是前台还是后台，这是我的习惯，你也可以不要，自己喜欢
<?xml version="1.0" encoding="UTF-8"?> <web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"> <display-name></display-name> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:applicationContext.xml, classpath:spring-mybatis.xml</param-value> </context-param> <listener> <description>spring监听器</description> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <servlet> <description>spring mvc servlet</description> <servlet-name>springMvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <description>spring mvc 配置文件</description> <param-name>contextConfigLocation</param-name> <param-value>classpath:spring-mvc.xml</param-value> </init-param> <init-param> <param-name>activeReverseAjaxEnabled</param-name> <param-value>true</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springMvc</servlet-name> <!-- 此处配置成*.do，对应struts的后缀习惯 --> <url-pattern>*.do</url-pattern> <!-- 此处配置成*.json，是为了能够截获"../*.json"格式的访问（例如android客户端） --> <url-pattern>*.json</url-pattern> </servlet-mapping> <filter> <filter-name>characterEncodingFilter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>UTF-8</param-value> </init-param> <init-param> <param-name>forceEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>characterEncodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app>
b： applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation=" http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd"> <!-- 开启注解 --> <context:annotation-config /> <!-- 自动扫描 --> <context:component-scan base-package="zhu.dao,zhu.service"> <context:include-filter type="annotation" expression="org.springframework.stereotype.Repository" /> <context:include-filter type="annotation" expression="org.springframework.stereotype.Service" /> </context:component-scan> </beans>
c:jdbc.properties ==>这里的链接mysql ，数据库记得改，看自己的是那个数据库每次
driverClassName=com.mysql.jdbc.Driver url=jdbc\:mysql\://localhost\:3306/jdbc01?useUnicode\=true&characterEncoding\=utf-8 username=root password=root validationQuery=SELECT 1 # \u6570\u636e\u5e93\u914d\u7f6e jdbc.driverClass=com.mysql.jdbc.Driver jdbc.url=jdbc\:mysql\://localhost\:3306/jdbc01?useUnicode\=true&characterEncoding\=utf-8&zeroDateTimeBehavior\=convertToNull jdbc.user=root jdbc.password=root #\u5305\u6587\u4ef6\u4f4d\u7f6e targetProject=THIS4 package.model=zhu.po package.sql.mapper=zhu.mapper package.dao.mapper=zhu.dao
d:log4j.properties
##### \u65e5\u5fd7\u914d\u7f6e\u8d44\u6e90\u6587\u4ef6\uff1a ##### \u63cf\u8ff0\u65e5\u5fd7\u8bb0\u5f55\u76f8\u5173\u914d\u7f6e\u4fe1\u606f log4j.rootCategory=INFO,stdout,logfile log4j.rootLogger=info,stdout log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.Target=System.out log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %c{1}:%L %5p - %m%n log4j.logger.com.netqin=INFO log4j.logger.org.springframework=INFO log4j.appender.logfile=org.apache.log4j.DailyRollingFileAppender log4j.appender.logfile.DatePattern='.'yyyy-MM-dd log4j.appender.logfile.File=F\:/S3S3M3.log log4j.appender.logfile.layout=org.apache.log4j.PatternLayout log4j.appender.logfile.layout.ConversionPattern=%d %p [%X{userName}][%X{userLocale}][%c] - <%m>%n
f:spring-mvc.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd"> <!-- 自动扫描controller包下的所有类，使其认为spring mvc的控制器 --> <context:component-scan base-package="zhu.web"> <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller" /> </context:component-scan> <!-- 日期转换 必须放在<mvc:annotation-driven />前面 --> <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"></bean> <!-- 注解方式 --> <mvc:annotation-driven> </mvc:annotation-driven> <!-- 启动Spring MVC的注解功能，完成请求和注解POJO的映射 --> <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" /> <!--mvc配置视图解析 --> <!-- 对模型视图名称的解析，即在模型视图名称添加前后缀 --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" > <property name="prefix" value="/WEB-INF/"></property> <property name="suffix" value=".jsp"></property> </bean> <!--跳转的时候只用写jsp名字，不用带后缀，因为默认的后缀“.jsp”,路径为“/WEB-INF/jsp” --> </beans>
g:spring-mybatis.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation=" http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd"> <!-- ========================================数据库方言========================================= --> <!-- properties配置文件 --> <bean id="dbProperties" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <!-- 是否忽略不可解析的 --> <property name="ignoreUnresolvablePlaceholders" value="true" /> <property name="locations"> <list> <value>classpath:jdbc.properties</value> </list> </property> </bean> <!-- ========================================数据源配置========================================= --> <!-- 配置数据源，使用的是alibaba的Druid(德鲁伊)数据源 --> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"> <property name="url" value="${url}" /> <property name="username" value="${username}" /> <property name="password" value="${password}" /> <!-- 初始化连接大小 --> <property name="initialSize" value="0" /> <!-- 连接池最大使用连接数量 --> <property name="maxActive" value="20" /> <!-- 连接池最大空闲 --> <property name="maxIdle" value="20" /> <!-- 连接池最小空闲 --> <property name="minIdle" value="0" /> <!-- 获取连接最大等待时间 --> <property name="maxWait" value="60000" /> <property name="validationQuery" value="${validationQuery}" /> <property name="testOnBorrow" value="false" /> <property name="testOnReturn" value="false" /> <property name="testWhileIdle" value="true" /> <!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 --> <property name="timeBetweenEvictionRunsMillis" value="60000" /> <!-- 配置一个连接在池中最小生存的时间，单位是毫秒 --> <property name="minEvictableIdleTimeMillis" value="25200000" /> <!-- 打开removeAbandoned功能 --> <property name="removeAbandoned" value="true" /> <!-- 1800秒，也就是30分钟 --> <property name="removeAbandonedTimeout" value="1800" /> <!-- 关闭abanded连接时输出错误日志 --> <property name="logAbandoned" value="true" /> <!-- 监控数据库 --> <!-- <property name="filters" value="stat" /> --> <property name="filters" value="mergeStat" /> </bean> <!-- ========================================MyBatis的配置项============================== --> <!-- 配置sqlSessionFactory --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <!-- 实例化sqlSessionFactory时需要使用上述配置好的数据源以及SQL映射文件 --> <property name="dataSource" ref="dataSource" /> <!-- <property name="configLocation" value="classpath:mybatis.cofig.xml" /> --> <!-- 自动扫描Mybatis的Mapper.xml文件 --> <property name="mapperLocations" value="classpath:zhu/mapper/*.xml" /> </bean> <!-- 配置扫描器 --> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <!-- 扫描zhu.dao这个包以及它的子包下的所有映射接口类 --> <property name="basePackage" value="zhu.dao" /> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" /> </bean> <!-- 配置事务管理器 --> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource" /> </bean> <!-- 拦截器方式配置事物 --> <tx:advice id="transactionAdvice" transaction-manager="transactionManager"> <tx:attributes> <tx:method name="add*" propagation="REQUIRED" /> <tx:method name="append*" propagation="REQUIRED" /> <tx:method name="insert*" propagation="REQUIRED" /> <tx:method name="save*" propagation="REQUIRED" /> <tx:method name="update*" propagation="REQUIRED" /> <tx:method name="modify*" propagation="REQUIRED" /> <tx:method name="edit*" propagation="REQUIRED" /> <tx:method name="delete*" propagation="REQUIRED" /> <tx:method name="remove*" propagation="REQUIRED" /> <tx:method name="repair" propagation="REQUIRED" /> <tx:method name="delAndRepair" propagation="REQUIRED" /> <tx:method name="get*" propagation="SUPPORTS" /> <tx:method name="find*" propagation="SUPPORTS" /> <tx:method name="load*" propagation="SUPPORTS" /> <tx:method name="search*" propagation="SUPPORTS" /> <tx:method name="datagrid*" propagation="SUPPORTS" /> <tx:method name="*" propagation="SUPPORTS" /> </tx:attributes> </tx:advice> <aop:config> <!-- 配置所有的Advice,使用正则表达式，配置所有类，所有返回值的方法 --> <aop:pointcut id="transactionPointcut" expression="execution(* zhu.service..*Impl.*(..))" /> <aop:advisor pointcut-ref="transactionPointcut" advice-ref="transactionAdvice" /> </aop:config> <!-- 配置druid监控spring jdbc --> <bean id="druid-stat-interceptor" class="com.alibaba.druid.support.spring.stat.DruidStatInterceptor"></bean> <bean id="druid-stat-pointcut" class="org.springframework.aop.support.JdkRegexpMethodPointcut" scope="prototype"> <property name="patterns"> <list> <value>zhu.service.*</value> </list> </property> </bean> <aop:config> <aop:advisor advice-ref="druid-stat-interceptor" pointcut-ref="druid-stat-pointcut" /> </aop:config> </beans>
数据库的表
创建表：
USE jdbc01;
CREATE TABLE tbdept(
did INT PRIMARY KEY AUTO_INCREMENT,
dname VARCHAR(40),
)ENGINE=INNODB DEFAULT CHARSET=utf8;
新增数据
INSERT INTO tbdept ( dname ) VALUES ( 'A部门' );
INSERT INTO tbdept ( dname ) VALUES ( 'B部门' );
INSERT INTO tbdept ( dname ) VALUES ( 'C部门' );
2):代码
- a）：po层
package zhu.po; public class Tbdept { private Integer did; private String dname; public Integer getDid() { return did; } public void setDid(Integer did) { this.did = did; } public String getDname() { return dname; } public void setDname(String dname) { this.dname = dname; } }
- b):mapper(映射)
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" > <!--namespace命令空间，作用就是对sql进行分类化管理，理解sql隔离 注意：使用mapper代理方法开发，namepace有特殊重要的作用 --> <mapper namespace="zhu.dao.TbempMapper" > <resultMap id="BaseResultMap" type="zhu.po.Tbdept" > <id column="did" property="did" jdbcType="INTEGER" /> <result column="dname" property="dname" jdbcType="VARCHAR" /> </resultMap> <sql id="Base_Column_List" > did, dname </sql> <select id="query_tbDept" resultType="zhu.po.Tbdept" > SELECT did,dname FROM tbdept </select> </mapper>
- c):dao层
package zhu.dao; import java.util.List; import org.springframework.stereotype.Repository; import zhu.po.Tbdept; @Repository(value = "tbemdao") public interface TbempMapper { List<Tbdept> query_tbDept (); }
- d):service
package zhu.service; import java.util.List; import zhu.po.Tbdept; public interface I_tbenService { List<Tbdept> query_tbDept (); }
package zhu.service.impl; import java.util.List; import javax.annotation.Resource; import org.springframework.stereotype.Service; import zhu.dao.TbempMapper; import zhu.po.Tbdept; import zhu.service.I_tbenService; @Service public class TbempService_Impl implements I_tbenService { @Resource(name="tbemdao") private TbempMapper my_tbemp; @Override public List<Tbdept> query_tbDept() { // TODO Auto-generated method stub return my_tbemp.query_tbDept(); } }
- f):web
package zhu.web; import java.io.IOException; import java.io.PrintWriter; import java.util.List; import javax.servlet.ServletException; import javax.servlet.http.HttpServletResponse; import net.sf.json.JSONObject; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody; import zhu.po.Tbdept; import zhu.service.I_tbenService; @Controller @RequestMapping("/Binding_Cbo") public class Binding_Cbo { @Autowired private I_tbenService my_TbenService; @RequestMapping(value="/android_cbo.json",produces="application/json") public void android_cbo(HttpServletResponse response)throws ServletException, IOException{ JSONObject json = new JSONObject(); PrintWriter writer = response.getWriter(); List<Tbdept> cbo_bm= my_TbenService.query_tbDept(); json.put("cbo_bm", cbo_bm); writer.write(json.toString()); writer.close(); } }
然后检查一下 是否能成功 运行
三：Android studio
- a);先进行准备前工作先 在build.gradle四个地方要加入代码
// Top-level build file where you can add configuration options common to all sub-projects/modules. buildscript { repositories { jcenter() // add plugin } dependencies { classpath 'com.android.tools.build:gradle:2.3.3' classpath 'org.greenrobot:greendao-gradle-plugin:3.2.2' // add plugin // NOTE: Do not place your application dependencies here; they belong // in the individual module build.gradle files } } allprojects { repositories { jcenter() } } task clean(type: Delete) { delete rootProject.buildDir }
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// 这个非常重要，会生成Dao的类
greendao { //add plugin
schemaVersion 2
//生成greedao的对象类的路径
设置DaoMaster,DaoSession,Dao包的路径，我不太喜欢它原来的路径，每次找都很麻烦，所以把它放在一个自己方便看的路径下来，你也可以不要下面这两句!
daoPackage 'zhu.com.sprnner_cbo.greendao'
targetGenDir 'src/main/java'//保存到java代码路径 ==》这句你可以不要
}
如果没有这俩句，那么DaoMaster,DaoSession,Dao的原路径是在这里的
有这俩句，那么DaoMaster,DaoSession,Dao那么路径挺好找的
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
apply plugin: 'com.android.application' apply plugin: 'org.greenrobot.greendao'//add plugin android { compileSdkVersion 26 buildToolsVersion "26.0.1" defaultConfig { applicationId "zhu.com.sprnner_cbo" minSdkVersion 19 targetSdkVersion 26 versionCode 1 versionName "1.0" testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" } buildTypes { release { minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' } } } // 这个非常重要，会生成Dao的类 greendao { //add plugin schemaVersion 2 //生成greedao的对象类的路径 ==》我不太喜欢它原来的路径，所以把它放在一个自己方便看的路径下来,所以这句你可以不要! daoPackage 'zhu.com.sprnner_cbo.greendao' targetGenDir 'src/main/java'//保存到java代码路径 ==》这句你可以不要 } dependencies { compile fileTree(dir: 'libs', include: ['*.jar']) androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', { exclude group: 'com.android.support', module: 'support-annotations' }) compile 'com.android.support:appcompat-v7:26.+' compile 'com.android.support.constraint:constraint-layout:1.0.2' compile 'com.loopj.android:android-async-http:1.4.9'// add library==》这个是添加 网络请求的插件 compile 'org.greenrobot:greendao:3.2.2' // add library ==>这个是 添加 greedao插件 testCompile 'junit:junit:4.12' }
b):因为需要网络的请求 所以 要必须 要在AndroidManifest.xml加一句代码，不加就会出现下面这种错误的情况
12-26 02:45:25.969 5267-5334/zhu.com.sprnner_cbo W/System.err: java.net.SocketException: Permission denied 12-26 02:45:25.970 5267-5334/zhu.com.sprnner_cbo W/System.err: at java.net.Socket.createImpl(Socket.java:473) 12-26 02:45:25.970 5267-5334/zhu.com.sprnner_cbo W/System.err: at java.net.Socket.getImpl(Socket.java:536) 12-26 02:45:25.971 5267-5334/zhu.com.sprnner_cbo W/System.err: at java.net.Socket.setSoTimeout(Socket.java:1127) 12-26 02:45:25.971 5267-5334/zhu.com.sprnner_cbo W/System.err: at cz.msebera.android.httpclient.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:116) 12-26 02:45:25.971 5267-5334/zhu.com.sprnner_cbo W/System.err: at cz.msebera.android.httpclient.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:157) 12-26 02:45:25.971 5267-5334/zhu.com.sprnner_cbo W/System.err: at cz.msebera.android.httpclient.conn.scheme.SchemeSocketFactoryAdaptor.connectSocket(SchemeSocketFactoryAdaptor.java:65) 12-26 02:45:25.972 5267-5334/zhu.com.sprnner_cbo W/System.err: at cz.msebera.android.httpclient.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:177) 12-26 02:45:25.972 5267-5334/zhu.com.sprnner_cbo W/System.err: at cz.msebera.android.httpclient.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:145) 12-26 02:45:25.972 5267-5334/zhu.com.sprnner_cbo W/System.err: at cz.msebera.android.httpclient.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:131) 12-26 02:45:25.972 5267-5334/zhu.com.sprnner_cbo W/System.err: at cz.msebera.android.httpclient.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:611) 12-26 02:45:25.973 5267-5334/zhu.com.sprnner_cbo W/System.err: at cz.msebera.android.httpclient.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:446) 12-26 02:45:25.973 5267-5334/zhu.com.sprnner_cbo W/System.err: at cz.msebera.android.httpclient.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:860) 12-26 02:45:25.973 5267-5334/zhu.com.sprnner_cbo W/System.err: at cz.msebera.android.httpclient.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82) 12-26 02:45:25.973 5267-5334/zhu.com.sprnner_cbo W/System.err: at com.loopj.android.http.AsyncHttpRequest.makeRequest(AsyncHttpRequest.java:146) 12-26 02:45:25.974 5267-5334/zhu.com.sprnner_cbo W/System.err: at com.loopj.android.http.AsyncHttpRequest.makeRequestWithRetries(AsyncHttpRequest.java:177) 12-26 02:45:25.974 5267-5334/zhu.com.sprnner_cbo W/System.err: at com.loopj.android.http.AsyncHttpRequest.run(AsyncHttpRequest.java:106) 12-26 02:45:25.974 5267-5334/zhu.com.sprnner_cbo W/System.err: at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:428) 12-26 02:45:25.974 5267-5334/zhu.com.sprnner_cbo W/System.err: at java.util.concurrent.FutureTask.run(FutureTask.java:237) 12-26 02:45:25.975 5267-5334/zhu.com.sprnner_cbo W/System.err: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133) 12-26 02:45:25.975 5267-5334/zhu.com.sprnner_cbo W/System.err: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607) 12-26 02:45:25.975 5267-5334/zhu.com.sprnner_cbo W/System.err: at java.lang.Thread.run(Thread.java:761)
好了配置弄好剩下的就 很好解决了
c):代码
activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="zhu.com.sprnner_cbo.MainActivity"> <Spinner android:id="@+id/kj_spinner_tbmep" android:layout_width="240dp" android:layout_height="30dp" android:layout_margin="5dp" android:background="@drawable/etitext_frame_radiuo" android:spinnerMode="dialog" android:entries="@array/cbo_tbmep" /> </RelativeLayout>
d):设置实体类：
实体类 要根据返回的json中 相对于的key 一一对应
注意： 主键：id必须要设置Long的类型 ，切记 必须要加入 @Entity， 和@Id
设置好变量后 ，还有一个操作 设置 生成DaoMaster,DaoSession,Dao类的操作，这它就会自动补全我们实体类剩下的get和set的方法了
================生成的========》
最后在实体类中再加 一个方法 得到 从 服务器专递的json的数据 // 将json ==>转化为 Bean的对象（即Tb_Cbo_CLDL的对象） public static Tbmep json_To_Bean(JSONObject object){ try { return new Tbmep(object.getLong("did"), object.getString("dname") ); }catch (Exception e){ } return null; }
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package zhu.com.sprnner_cbo; import org.greenrobot.greendao.annotation.Entity; import org.greenrobot.greendao.annotation.Id; import org.greenrobot.greendao.annotation.Generated; import org.json.JSONObject; /** * Created by XiaoZhu on 2017/12/14. */ @Entity public class Tbmep { @Id private Long did; private String dname; @Generated(hash = 1103728403) public Tbmep(Long did, String dname) { this.did = did; this.dname = dname; } @Generated(hash = 1857599075) public Tbmep() { } public Long getDid() { return this.did; } public void setDid(Long did) { this.did = did; } public String getDname() { return this.dname; } public void setDname(String dname) { this.dname = dname; } // 将json ==>转化为 Bean的对象（即Tb_Cbo_CLDL的对象） public static Tbmep json_To_Bean(JSONObject object){ try { return new Tbmep(object.getLong("did"), object.getString("dname") ); }catch (Exception e){ } return null; } }
MainActivity
package zhu.com.sprnner_cbo; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.Spinner; import android.widget.Toast; import com.loopj.android.http.AsyncHttpClient; import com.loopj.android.http.AsyncHttpResponseHandler; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import java.io.InputStream; import java.util.ArrayList; import java.util.List; import cz.msebera.android.httpclient.Header; import cz.msebera.android.httpclient.HttpResponse; import cz.msebera.android.httpclient.NameValuePair; import cz.msebera.android.httpclient.client.entity.UrlEncodedFormEntity; import cz.msebera.android.httpclient.client.methods.HttpPost; import cz.msebera.android.httpclient.impl.client.DefaultHttpClient; import cz.msebera.android.httpclient.message.BasicNameValuePair; public class MainActivity extends AppCompatActivity implements AdapterView.OnItemSelectedListener { private Spinner btn_spinner_tbmep; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); btn_spinner_tbmep = (Spinner) findViewById(R.id.kj_spinner_tbmep); btn_spinner_tbmep.setOnItemSelectedListener(MainActivity. this);//成品尺寸 } /** * 如果使用 类 实现==>这个的 implements AdapterView.OnItemSelectedListener * ，那么就必须要复写下面这个方法onItemSelected() * onNothingSelected() * @param adapterView * @param view * @param i * @param l */ @Override //成功干嘛 public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) { switch (adapterView.getId()){ case R.id.kj_spinner_tbmep: //kj_spinner_tbmep ==>这个是 控件的 id名称 cbo_tbmep(); break; } } @Override //不成功干嘛 public void onNothingSelected(AdapterView<?> adapterView) { } //==>这是系统自带的 下拉框 private List<String> list_Cbo_str=null;// 接受string的数据 List<Tbmep> list_cboBinding=null;//接收 TbCboCLDL对象的数据 ArrayAdapter<String> arrayAdapter=null; int tbmepId=0;//接收ID //访问后台的 封面纸张的 链接 public void cbo_tbmep(){ AsyncHttpClient client =new AsyncHttpClient(); //第一个参数是访问 后台的路径，第二是：参数根据 id获取 string 查询数据 ，第三个:回调函数 client.get("http://192.168.191.2:8080/2017_1214_cbo/Binding_Cbo/android_cbo.json", null, new AsyncHttpResponseHandler() { @Override public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) { if (statusCode==200){ try { JSONObject object = new JSONObject(new String(responseBody));//获取json数据 JSONArray jsonArray = object.getJSONArray("cbo_bm");//获取数据集名称为obj的数据 Log.d("jsonArray数据输出：", String.valueOf(jsonArray)); list_cboBinding = new ArrayList<>(); for(int i=0;i<jsonArray.length();i++){ //把 json 转换为 ==》bean的对象形式 Tbmep cbo=Tbmep.json_To_Bean(jsonArray.getJSONObject(i)); if (cbo!=null){ list_cboBinding.add(cbo);//把对象放入 list的数组中 } } //判断是否有数据 if (jsonArray.length() > 0) { list_Cbo_str = new ArrayList<>(); for (int i = 0; i < list_cboBinding.size(); i++) { Tbmep section = list_cboBinding.get(i); list_Cbo_str.add(section.getDname()); } //1.为下拉列表定义一个数组适配器，这个数组适配器就用到里前面定义的list。装的都是list所添加的内容 android.R.layout.simple_spinner_item==》这是系统本来就有的哦 arrayAdapter = new ArrayAdapter<>(MainActivity.this, android.R.layout.simple_spinner_item, list_Cbo_str); //2.为适配器设置下拉菜单样式。android.R.layout.simple_list_item_single_choice==》Android系统自带样式 arrayAdapter.setDropDownViewResource(android.R.layout.simple_list_item_single_choice); //3.以上声明完毕后，建立适配器,有关于sipnner这个控件的建立。用到kj_user_fm_spinner_papers2 btn_spinner_tbmep.setAdapter(arrayAdapter); //4.为下拉列表设置各种点击事件，以响应菜单中的文本item被选中了，用setOnItemSelectedListener btn_spinner_tbmep.setOnItemSelectedListener(new Spinner.OnItemSelectedListener() {//选择item的选择点击监听事件 public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { tbmepId=0; tbmepId =list_cboBinding.get((int) id).getDid().intValue();//获取id arrayAdapter.getItem(position);//==》获取选择的项目名称 } public void onNothingSelected(AdapterView<?> parent ) { } }); } } catch (JSONException e) { Toast.makeText(MainActivity.this, "下拉框加载失败！", Toast.LENGTH_SHORT).show(); } }else if(statusCode==400){ Toast.makeText(MainActivity.this, "若返回值400，则是返回网络异常！", Toast.LENGTH_SHORT).show(); } } @Override public void onFailure(int statusCode, Header[] headers, byte[] responseBody, Throwable error) { Toast.makeText(MainActivity.this, "请求网络失败！", Toast.LENGTH_SHORT).show(); } }) ; } }
好了，上面的就是我 绑定Android下拉框所有的代码了
运行时必须要先运行后台服务器，要不根本跑不起来，还有如果使用真机必须要使用同一个wifi
运行效果：
因为每次想下载的时候CSDN都要资源分而我刚好没有，所以我把我这次的源码放到了CSDN上。。。。上面的代码是已经齐的了，如果实在不想下载，那你可以去我之前的http://www.cnblogs.com/zhu520/p/7883273.html 下载 ssm ,去 里面找 jar 即可
源码：http://download.csdn.net/download/qq_35812301/10174004
