Android/Eclipse：如何嵌入.jar文件？

Question

我无法将库（ksoap在我的案例中）嵌入到我的项目中。在运行时出现错误“无法找到类”org.ksoap2.serialization.SoapObject'从方法引用...“。当然，这个类在ksoap库中是可用的，不需要提到我的代码中有各自的“import ...”行。我试图用我在这里找到的不同方式将它嵌入到stackoverflow和其他地方。我通过Properties => Build Path =>添加外部jar，并通过导入jar，Properties => Build path =>添加jar。它没有区别，其他库也是如此。我也尝试选择Google API或Android作为Build Target - 但是，它不会改变。

我正在使用Eclipse Juno，该项目是Android 2.2之一。基本上，我一直在关注指南http://www.youtube.com/watch?v=v9EowBVgwSo

请参阅下面的代码和错误消息的完整列表。

package com.example.mytest; 

import android.os.Bundle; 
import android.app.Activity; 
import android.view.Menu; 
import org.ksoap2.SoapEnvelope; 
import org.ksoap2.serialization.SoapObject; 
import org.ksoap2.serialization.SoapPrimitive; 
import org.ksoap2.serialization.SoapSerializationEnvelope; 
import org.ksoap2.transport.HttpTransportSE; 
import android.widget.TextView; 

public class FirstScreen extends Activity { 
    private static final String SOAP_ACTION = "http://tempuri.org/CelsiusToFahrenheit"; 
    private static final String METHOD_NAME = "CelsiusToFahrenheit"; 
    private static final String NAMESPACE = "http://tempuri.org"; 
    private static final String URL = "http://www.w3schools.com/webservices/tempconvert.asmx"; 
    TextView tv;   
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_first_screen); 
     tv = (TextView)findViewById(R.id.textView01); 
     tv.setText("Mein Test"); 

     SoapObject Request = new SoapObject(NAMESPACE, METHOD_NAME); 
     Request.addProperty("Celsius", "32"); 

     SoapSerializationEnvelope soapEnvelope = new SoapSerializationEnvelope(SoapEnvelope.VER11); 
     soapEnvelope.dotNet = true; 
     soapEnvelope.setOutputSoapObject(Request); 

     HttpTransportSE aht = new HttpTransportSE(URL); 

     try 
     { 
      aht.call(SOAP_ACTION, soapEnvelope); 
      SoapPrimitive resultString = (SoapPrimitive) soapEnvelope.getResponse(); 
      tv.setText("Status: " + resultString); 

     } 
     catch(Exception e) 
     { 
      e.printStackTrace(); 
     } 

    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     getMenuInflater().inflate(R.menu.activity_first_screen, menu); 
     return true; 
    } 
} 

错误消息：

10-13 12:59:00.734: E/dalvikvm(6567): Could not find class 'org.ksoap2.serialization.SoapObject', referenced from method com.example.mytest.FirstScreen.onCreate 
10-13 12:59:00.734: W/dalvikvm(6567): VFY: unable to resolve new-instance 501 (Lorg/ksoap2/serialization/SoapObject;) in Lcom/example/mytest/FirstScreen; 
10-13 12:59:00.734: D/dalvikvm(6567): VFY: replacing opcode 0x22 at 0x0012 
10-13 12:59:00.734: D/dalvikvm(6567): VFY: dead code 0x0014-005a in Lcom/example/mytest/FirstScreen;.onCreate (Landroid/os/Bundle;)V 
10-13 12:59:00.875: D/AndroidRuntime(6567): Shutting down VM 
10-13 12:59:00.875: W/dalvikvm(6567): threadid=1: thread exiting with uncaught exception (group=0x40015578) 
10-13 12:59:00.875: E/AndroidRuntime(6567): FATAL EXCEPTION: main 
10-13 12:59:00.875: E/AndroidRuntime(6567): java.lang.NoClassDefFoundError: org.ksoap2.serialization.SoapObject 
10-13 12:59:00.875: E/AndroidRuntime(6567):  at com.example.mytest.FirstScreen.onCreate(FirstScreen.java:25) 
10-13 12:59:00.875: E/AndroidRuntime(6567):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
10-13 12:59:00.875: E/AndroidRuntime(6567):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615) 
10-13 12:59:00.875: E/AndroidRuntime(6567):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667) 
10-13 12:59:00.875: E/AndroidRuntime(6567):  at android.app.ActivityThread.access$1500(ActivityThread.java:117) 
10-13 12:59:00.875: E/AndroidRuntime(6567):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935) 
10-13 12:59:00.875: E/AndroidRuntime(6567):  at android.os.Handler.dispatchMessage(Handler.java:99) 
10-13 12:59:00.875: E/AndroidRuntime(6567):  at android.os.Looper.loop(Looper.java:130) 
10-13 12:59:00.875: E/AndroidRuntime(6567):  at android.app.ActivityThread.main(ActivityThread.java:3687) 
10-13 12:59:00.875: E/AndroidRuntime(6567):  at java.lang.reflect.Method.invokeNative(Native Method) 
10-13 12:59:00.875: E/AndroidRuntime(6567):  at java.lang.reflect.Method.invoke(Method.java:507) 
10-13 12:59:00.875: E/AndroidRuntime(6567):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842) 
10-13 12:59:00.875: E/AndroidRuntime(6567):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600) 
10-13 12:59:00.875: E/AndroidRuntime(6567):  at dalvik.system.NativeStart.main(Native Method) 
10-13 12:59:00.878: I/Process(6567): Sending signal. PID: 6567 SIG: 9 
10-13 13:03:01.222: E/dalvikvm(6870): Could not find class 'org.ksoap2.serialization.SoapObject', referenced from method com.example.mytest.FirstScreen.onCreate 
10-13 13:03:01.222: W/dalvikvm(6870): VFY: unable to resolve new-instance 33 (Lorg/ksoap2/serialization/SoapObject;) in Lcom/example/mytest/FirstScreen; 
10-13 13:03:01.222: D/dalvikvm(6870): VFY: replacing opcode 0x22 at 0x0012 
10-13 13:03:01.222: D/dalvikvm(6870): VFY: dead code 0x0014-005a in Lcom/example/mytest/FirstScreen;.onCreate (Landroid/os/Bundle;)V 
10-13 13:03:01.472: D/AndroidRuntime(6870): Shutting down VM 
10-13 13:03:01.472: W/dalvikvm(6870): threadid=1: thread exiting with uncaught exception (group=0x40015578) 
10-13 13:03:01.519: E/AndroidRuntime(6870): FATAL EXCEPTION: main 
10-13 13:03:01.519: E/AndroidRuntime(6870): java.lang.NoClassDefFoundError: org.ksoap2.serialization.SoapObject 
10-13 13:03:01.519: E/AndroidRuntime(6870):  at com.example.mytest.FirstScreen.onCreate(FirstScreen.java:25) 
10-13 13:03:01.519: E/AndroidRuntime(6870):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
10-13 13:03:01.519: E/AndroidRuntime(6870):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615) 
10-13 13:03:01.519: E/AndroidRuntime(6870):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667) 
10-13 13:03:01.519: E/AndroidRuntime(6870):  at android.app.ActivityThread.access$1500(ActivityThread.java:117) 
10-13 13:03:01.519: E/AndroidRuntime(6870):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935) 
10-13 13:03:01.519: E/AndroidRuntime(6870):  at android.os.Handler.dispatchMessage(Handler.java:99) 
10-13 13:03:01.519: E/AndroidRuntime(6870):  at android.os.Looper.loop(Looper.java:130) 
10-13 13:03:01.519: E/AndroidRuntime(6870):  at android.app.ActivityThread.main(ActivityThread.java:3687) 
10-13 13:03:01.519: E/AndroidRuntime(6870):  at java.lang.reflect.Method.invokeNative(Native Method) 
10-13 13:03:01.519: E/AndroidRuntime(6870):  at java.lang.reflect.Method.invoke(Method.java:507) 
10-13 13:03:01.519: E/AndroidRuntime(6870):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842) 
10-13 13:03:01.519: E/AndroidRuntime(6870):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600) 
10-13 13:03:01.519: E/AndroidRuntime(6870):  at dalvik.system.NativeStart.main(Native Method) 

Answer 1

（回答问题编辑转换为一个社区维基答案见What is the appropriate action when the answer to a question is added to the question itself?。）

的OP写道：

解决了感谢关于libs文件夹的提示。

感谢我收到的另一个提示，我能够找出问题所在。只需将库添加到libs文件夹是不够的 - 它需要从该位置添加到构建路径（Properties => Java Build Path => Add Jars）。

对于那些熟悉Java/Android开发的人来说，这可能是非常明显的 - 但我对这个东西完全陌生。谢谢您的帮助！