Guessing you need to have it in the lib directory in your Android project.
Adding it as an external library in eclipse adds it to your eclipse
classpath, so the build errors disappear in eclipse, but the android build
process only packages the jars it finds in your project's lib dir.
On Friday, September 21, 2012 10:41:42 AM UTC-5, bob wrote:
>
> Eventually, I want to create a JAR library with my Android routines in it.
>
> So, I tried this test:
>
> package com.jar_test;
>
> public class Jar_Test {
> public static void jar_test()
> {
> System.out.println("This is a JAR test");
> }
>
> }
>
>
> I exported that to a JAR.
>
>
>
>
> Then, I made this test app:
>
> package com.jar_test2;
>
> import com.jar_test.Jar_Test;
>
> import android.app.Activity;
> import android.os.Bundle;
>
> public class MainActivity extends Activity {
> /** Called when the activity is first created. */
> @Override
> public void onCreate(Bundle savedInstanceState) {
> super.onCreate(savedInstanceState);
> setContentView(R.layout.main);
> Jar_Test.jar_test();
> }
> }
>
> However, I got this error when I ran it.
>
>
> 09-21 10:33:57.710: E/AndroidRuntime(3366): FATAL EXCEPTION: main
> 09-21 10:33:57.710: E/AndroidRuntime(3366):
> java.lang.NoClassDefFoundError: com.jar_test.Jar_Test
> 09-21 10:33:57.710: E/AndroidRuntime(3366): at
> com.jar_test2.MainActivity.onCreate(MainActivity.java:14)
> 09-21 10:33:57.710: E/AndroidRuntime(3366): at
> android.app.Activity.performCreate(Activity.java:4469)
> 09-21 10:33:57.710: E/AndroidRuntime(3366): at
> android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1052)
> 09-21 10:33:57.710: E/AndroidRuntime(3366): at
> android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1932)
> 09-21 10:33:57.710: E/AndroidRuntime(3366): at
> android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1993)
> 09-21 10:33:57.710: E/AndroidRuntime(3366): at
> android.app.ActivityThread.access$600(ActivityThread.java:127)
> 09-21 10:33:57.710: E/AndroidRuntime(3366): at
> android.app.ActivityThread$H.handleMessage(ActivityThread.java:1159)
> 09-21 10:33:57.710: E/AndroidRuntime(3366): at
> android.os.Handler.dispatchMessage(Handler.java:99)
> 09-21 10:33:57.710: E/AndroidRuntime(3366): at
> android.os.Looper.loop(Looper.java:137)
> 09-21 10:33:57.710: E/AndroidRuntime(3366): at
> android.app.ActivityThread.main(ActivityThread.java:4507)
> 09-21 10:33:57.710: E/AndroidRuntime(3366): at
> java.lang.reflect.Method.invokeNative(Native Method)
> 09-21 10:33:57.710: E/AndroidRuntime(3366): at
> java.lang.reflect.Method.invoke(Method.java:511)
> 09-21 10:33:57.710: E/AndroidRuntime(3366): at
> com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:978)
> 09-21 10:33:57.710: E/AndroidRuntime(3366): at
> com.android.internal.os.ZygoteInit.main(ZygoteInit.java:745)
> 09-21 10:33:57.710: E/AndroidRuntime(3366): at
> dalvik.system.NativeStart.main(Native Method)
>
> Anyone know what's wrong?
>
> I added the jar using 'Add External JARs…'
>
>
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