NoClassDefFoundError on Android project

问题

I have this problem that i can't understand how to solve. i have imported a maps forge project in eclipse using maven, but if try to load the project on device, i get this error. But i know that that class is in the project. How can i solve this problem?

I am working with the Mapsforge rescue 4.0 library. I have used the same method to import Mapsforge 0.31 and everything works fine.

    02-25 16:46:03.202: E/AndroidRuntime(6370): java.lang.NoClassDefFoundError: org.mapsforge.map.android.graphics.AndroidGraphicFactory

This is the pom.xml of the app.

    <?xml version="1.0" encoding="UTF-8"?>

http://maven.apache.org/xsd/maven-4.0.0.xsd"> 4.0.0 org.mapsforge mapsforge 0.4.0-SNAPSHOT ../../../pom.xml

<artifactId>Samples</artifactId>
<packaging>apk</packaging>

<properties>
    <rootDirectory>../../../</rootDirectory>
    <targetJdk>1.6</targetJdk>
</properties>

<build>
    <plugins>
        <plugin>
            <groupId>com.jayway.maven.plugins.android.generation2</groupId>
            <artifactId>android-maven-plugin</artifactId>
            <configuration>
                <dex>
                    <jvmArguments>
                        <jvmArgument>-Xmx512M</jvmArgument>
                    </jvmArguments>
                </dex>
            </configuration>
            <extensions>true</extensions>
        </plugin>

        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-eclipse-plugin</artifactId>
            <configuration>
                <useProjectReferences>false</useProjectReferences>
                <buildOutputDirectory>bin/classes</buildOutputDirectory>
                <additionalBuildcommands>
                    <buildcommand>com.android.ide.eclipse.adt.ResourceManagerBuilder</buildcommand>
                    <buildcommand>com.android.ide.eclipse.adt.PreCompilerBuilder</buildcommand>
                    <buildcommand>com.android.ide.eclipse.adt.ApkBuilder</buildcommand>
                    <buildcommand>org.eclipse.jdt.core.javabuilder</buildcommand>
                </additionalBuildcommands>
                <additionalProjectnatures>
                    <projectnature>org.eclipse.jdt.core.javanature</projectnature>
                    <projectnature>com.android.ide.eclipse.adt.AndroidNature</projectnature>
                </additionalProjectnatures>
                <classpathContainers>
                    <classpathContainer>org.eclipse.jdt.launching.JRE_CONTAINER</classpathContainer>
                    <classpathContainer>com.android.ide.eclipse.adt.ANDROID_FRAMEWORK</classpathContainer>
                    <classpathContainer>com.android.ide.eclipse.adt.LIBRARIES</classpathContainer>
                    <classpathContainer>com.android.ide.eclipse.adt.DEPENDENCIES</classpathContainer>
                </classpathContainers>
                <excludes>
                    <exclude>com.google.android:android</exclude>
                    <exclude>org.apache.httpcomponents:httpclient</exclude>
                    <exclude>org.apache.httpcomponents:httpcore</exclude>
                    <exclude>commons-codec:commons-codec</exclude>
                    <exclude>commons-logging:commons-logging</exclude>
                    <exclude>org.json:json</exclude>
                    <exclude>org.khronos:opengl-api</exclude>
                    <exclude>xerces:xmlParserAPIs</exclude>
                    <exclude>xpp3:xpp3</exclude>
                </excludes>
            </configuration>
        </plugin>
    </plugins>
</build>

<dependencies>
    <dependency>
        <groupId>org.mapsforge</groupId>
        <artifactId>mapsforge-map-android</artifactId>
        <type>apklib</type>
        <version>${project.version}</version>
    </dependency>

    <dependency>
        <groupId>android</groupId>
        <artifactId>android</artifactId>
        <version>4.4.2_r2</version>
        <scope>provided</scope>
    </dependency>

    <dependency>
        <groupId>com.jayway.android.robotium</groupId>
        <artifactId>robotium-solo</artifactId>
        <version>5.0.1</version>
        <scope>test</scope>
    </dependency>

    <dependency>
        <groupId>com.google.android</groupId>
        <artifactId>support-v4</artifactId>
        <version>r7</version>
    </dependency>
</dependencies>

回答1:

The solution is as follows:

Download those 5 files: mapsforge-core mapsforge-map mapsforge-map-reader mapsforge-map-android svg-android
Put those libraries (jar files) in your project folder libs
Than go to Project->clean

You don't need to install Maven or other plugins. Including the libraries through Java Build Path -> Libraries -> Add External JARs won't work. You need to put it in the libs folder. If it still doesn't work, make sure you update your android tools and try again.

Good luck :)

来源：https://stackoverflow.com/questions/22019896/noclassdeffounderror-on-android-project

标签

java

android

eclipse

mapsforge