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POAndroid, class not found from imported jar file
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  1. POAndroid, class not found from imported jar file
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    copied!<p>I included a jar file in my Android project as explained in <a href="https://stackoverflow.com/questions/1334802/how-can-i-use-external-jars-in-an-android-project">How can I use external JARs in an Android project?</a>. With both methods described by MannyNS and Vinayak B. in this post I get the error "Could not find class 'test.libraryCalc.Calc" which is the class provided by the library. The following code illustrates the problem:</p> <p>Example class provided via library: Calc.java</p> <pre><code>package test.libraryCalc; public class Calc { public int add(int a, int b){ return a + b; } } </code></pre> <p>LibraryTestActivity.java</p> <pre><code>package test.library; import test.libraryCalc.Calc; import android.app.Activity; import android.os.Bundle; public class LibraryTestActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Calc calc = new Calc(); int c = calc.add(3, 4); } } </code></pre> <p>I exported the jar file containing Calc.java to LibraryTest\libs\calc.jar</p> <p><img src="https://i.stack.imgur.com/iRWi4.png" alt="enter image description here"></p> <p>and added a reference to it using the "Add JARs..." button in the Java Build Path of LibraryTest</p> <p><img src="https://i.stack.imgur.com/PtePm.png" alt="enter image description here"> The library shows up in the Referenced libraries in LibraryTest</p> <p><img src="https://i.stack.imgur.com/Fydeq.png" alt="enter image description here"></p> <p>LibraryTest has no build problems but when running it on the emulator the following is shown in LogCat:</p> <pre><code>12-27 14:01:33.965: E/dalvikvm(747): Could not find class 'test.libraryCalc.Calc', referenced from method test.library.LibraryTestActivity.onCreate 12-27 14:01:33.965: W/dalvikvm(747): VFY: unable to resolve new-instance 13 (Ltest/libraryCalc/Calc;) in Ltest/library/LibraryTestActivity; 12-27 14:01:33.995: D/dalvikvm(747): VFY: replacing opcode 0x22 at 0x0008 12-27 14:01:33.995: D/dalvikvm(747): VFY: dead code 0x000a-0013 in Ltest/library/LibraryTestActivity;.onCreate (Landroid/os/Bundle;)V 12-27 14:01:34.065: D/AndroidRuntime(747): Shutting down VM 12-27 14:01:34.065: W/dalvikvm(747): threadid=1: thread exiting with uncaught exception (group=0x4001d800) 12-27 14:01:34.075: E/AndroidRuntime(747): FATAL EXCEPTION: main 12-27 14:01:34.075: E/AndroidRuntime(747): java.lang.NoClassDefFoundError: test.libraryCalc.Calc 12-27 14:01:34.075: E/AndroidRuntime(747): at test.library.LibraryTestActivity.onCreate(LibraryTestActivity.java:14) 12-27 14:01:34.075: E/AndroidRuntime(747): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 12-27 14:01:34.075: E/AndroidRuntime(747): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 12-27 14:01:34.075: E/AndroidRuntime(747): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 12-27 14:01:34.075: E/AndroidRuntime(747): at android.app.ActivityThread.access$2300(ActivityThread.java:125) 12-27 14:01:34.075: E/AndroidRuntime(747): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 12-27 14:01:34.075: E/AndroidRuntime(747): at android.os.Handler.dispatchMessage(Handler.java:99) 12-27 14:01:34.075: E/AndroidRuntime(747): at android.os.Looper.loop(Looper.java:123) 12-27 14:01:34.075: E/AndroidRuntime(747): at android.app.ActivityThread.main(ActivityThread.java:4627) 12-27 14:01:34.075: E/AndroidRuntime(747): at java.lang.reflect.Method.invokeNative(Native Method) 12-27 14:01:34.075: E/AndroidRuntime(747): at java.lang.reflect.Method.invoke(Method.java:521) 12-27 14:01:34.075: E/AndroidRuntime(747): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 12-27 14:01:34.075: E/AndroidRuntime(747): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 12-27 14:01:34.075: E/AndroidRuntime(747): at dalvik.system.NativeStart.main(Native Method) 12-27 14:06:34.170: I/Process(747): Sending signal. PID: 747 SIG: 9 </code></pre> <p>What needs to be done to get this working? Thanks for all suggestions.</p>
 

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