<meta-data android:name="CHANNEL_ID" android:value="\ CHANNEL_ID_VALUE"/>

 public static String getChannnel(Context context) {
        String  channel = null;
        ApplicationInfo appInfo;
        try {
            appInfo = context.getPackageManager().getApplicationInfo(
                    context.getPackageName(), PackageManager.GET_META_DATA);
            channel=appInfo.metaData.getString("CHANNEL_ID");
        } catch (NameNotFoundException e) {
        }
        return channel;
 }

} ## 定义多个渠道

testa,weba,baidu ## 生成build文件 在项目根目录下执行，会生成了这些文件（build.xml,ant.properties,custom_rules.xml）

ant android project update

 <import file="custom_rules.xml" optional="true" />

<property file="channel.txt"/>
	<tstamp>
			<format property="TODAY" pattern="yyyyMMdd"/>
	</tstamp>
	<property name="ant.project.name" value="${app.name}-${app.version}-${app.svnv}-${TODAY}-${channel_id}">
</property>

key.store=*.keystore
key.alias=******
key.store.password=******
key.alias.password=******
app.name=APP
app.version=1.0.0

output.dir=D:\build
ant-contrib.dir=D:/dev/ant-contrib-1.0b2.jar

<?xml version="1.0" encoding="UTF-8"?>
<project name="custom_rules">
     <tstamp>
			<format property="TODAY" pattern="yyyyMMdd"/>
	 </tstamp>
	 <target name="-pre-build">
        <copy file="AndroidManifest.tmpl" tofile="AndroidManifest.xml" overwrite="true"/>
        <replace file="AndroidManifest.xml" token="SDK_CHANNEL_ID" value="${channel_id}"/>
        <echo level="info">replace SDK_PARTNER ${channel_id}</echo>
        <replace file="AndroidManifest.xml" token="SDK_BUILD_DATE" value="${TODAY}"/>
        <echo level="info">replace SDK_BUILD_DATE ${TODAY}</echo>
        <replace file="AndroidManifest.xml" token="SDK_BUILD_SVNV" value="${app.svnv}"/>
        <echo level="info">replace SDK_BUILD_SVNV ${app.svnv}</echo>
    </target>
</project>

<?xml version="1.0" encoding="UTF-8"?>
<project default="help">
    <!-- ************************* Help ************************ -->
    <target name="help">
        <echo>Android Muilit Ant Build. Available targets:</echo>
        <echo>   help:			Displays this help.</echo>
        <echo>   build_all:     Muilit build all ids app</echo>
        <echo>   build_copyto:  copy apk to build.</echo>
        <echo>   build_clean:   delete apk bin</echo>
    </target>
    <!-- ************************* build_copyto ************************ -->
    <target name="build_copyto" depends="build_all">
        <property file="ant.properties"/>
        <delete dir="${output.dir}" includeEmptyDirs="true" includes="${app.name}-${app.version}-*"/>
        <copy todir="D:\build" verbose="true">
            <fileset dir="bin" >
                <include name="${app.name}-${app.version}-*-release.apk" />
            </fileset>
             <globmapper from="*-release.apk" to="*.apk"/>  
        </copy>
   </target>
    <!-- ************************* build_clean ************************ -->
    <target name="build_clean" depends="build_copyto,build_all">
        <property file="ant.properties"/>
        <delete verbose="true" includeEmptyDirs="true" > 
             <fileset dir="bin" >
                <include name="${app.name}-${app.version}-*-unaligned.apk" />
                <include name="${app.name}-${app.version}-*-unsigned.apk" />
                <include name="${app.name}-${app.version}-*-unsigned.apk.d" />
                <include name="${app.name}-${app.version}-*.ap_" />
                <include name="${app.name}-${app.version}-*.ap_.d" />
                <include name="${app.name}-${app.version}-*-release.apk" />
            </fileset>
        </delete>
   </target>
    <!-- ************************* build_all ************************ -->
   <target name="build_all">
	   <property name="ant-contrib.jar" location="${ant-contrib.dir}" />
	   <taskdef resource="net/sf/antcontrib/antcontrib.properties" classpath="${ant-contrib.jar}" />
	   <loadfile property="ids" srcFile="channel.txt">
		        <filterchain> 
		            <tokenfilter delimoutput=","/>
		        </filterchain>
   		 </loadfile>
	    <foreach target="build_one" list="${ids}" delimiter="," param="id">
	    </foreach>
    </target>
   <target name="build_one">
        <echo message="start build channel_id=${id}"/>
        <!---->
        <ant antfile="build.xml" target="release">
            <property name="channel_id" value="${id}"/>
        </ant>
   </target>
</project>