如何修复java.lang.NoClassDefFoundError：org.jsoup.Jsoup错误？

Question

如何解决“NoClassDefFoundError”？我一直试图在我的android应用程序中设置Jsoup。我已将Jsoup导入到libs文件夹中。当我编译它编译的代码时，应用程序会中断。

这是mainfest。

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="com.news.scrapweb3" 
    android:versionCode="1" 
    android:versionName="1.0" > 

    <uses-sdk android:minSdkVersion="14" android:targetSdkVersion="19" /> 
    <uses-permission android:name="android.permission.INTERNET" /> 

    <application 
     android:allowBackup="true" 
     android:icon="@drawable/ic_launcher" 
     android:label="@string/app_name" 
     android:theme="@style/AppTheme" > 
     <activity 
      android:name="com.news.scrapweb3.MainActivity" 
      android:label="@string/app_name" > 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 

       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 

    </application> 

</manifest> 

这是我尝试显示从Jsoup文本提取到textview的代码。

/** 
    * A dummy fragment representing a section of the app, but that simply 
    * displays dummy text. 
    */ 
    public static class DummySectionFragment extends Fragment { 
     /** 
     * The fragment argument representing the section number for this 
     * fragment. 
     */ 
     public static final String ARG_SECTION_NUMBER = "section_number"; 
     private Document doc; 

     public DummySectionFragment() { 
     } 

     @Override 
     public View onCreateView(LayoutInflater inflater, ViewGroup container, 
       Bundle savedInstanceState) { 
      View rootView = inflater.inflate(R.layout.fragment_main_dummy, 
        container, false); 

      try{ 

      doc= Jsoup.connect("http://www.google.com/").get(); 
      String title= doc.title(); 
      TextView dummyTextView = (TextView) rootView 
        .findViewById(R.id.section_label); 
      dummyTextView.setText(title); 
      }catch(IOException e){ 


      } 

      return rootView; 
     } 
    } 

这里是日志猫。

03-13 09:30:24.799: W/dalvikvm(1646): threadid=1: thread exiting with uncaught exception (group=0x40a71930) 
03-13 09:30:24.809: E/AndroidRuntime(1646): FATAL EXCEPTION: main 
03-13 09:30:24.809: E/AndroidRuntime(1646): java.lang.NoClassDefFoundError: org.jsoup.Jsoup 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at com.news.scrapweb3.MainActivity$DummySectionFragment.onCreateView(MainActivity.java:127) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at android.support.v4.app.Fragment.performCreateView(Fragment.java:1500) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:927) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1467) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:472) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at android.support.v4.view.ViewPager.populate(ViewPager.java:1068) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at android.support.v4.view.ViewPager.populate(ViewPager.java:914) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1436) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at android.view.View.measure(View.java:15518) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at android.view.View.measure(View.java:15518) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at android.widget.LinearLayout.measureVertical(LinearLayout.java:847) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at android.widget.LinearLayout.onMeasure(LinearLayout.java:588) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at android.view.View.measure(View.java:15518) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2176) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at android.view.View.measure(View.java:15518) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1874) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1089) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1265) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at android.view.Choreographer.doCallbacks(Choreographer.java:562) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at android.view.Choreographer.doFrame(Choreographer.java:532) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at android.os.Handler.handleCallback(Handler.java:725) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at android.os.Handler.dispatchMessage(Handler.java:92) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at android.os.Looper.loop(Looper.java:137) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at android.app.ActivityThread.main(ActivityThread.java:5041) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at java.lang.reflect.Method.invokeNative(Native Method) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at java.lang.reflect.Method.invoke(Method.java:511) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
03-13 09:30:24.809: E/AndroidRuntime(1646):  at dalvik.system.NativeStart.main(Native Method) 

修订

如果我删除此代码。项目开始工作。

try { 

     doc = Jsoup.connect("http://www.google.com/").get(); 
     String title = doc.title(); 
     TextView dummyTextView = (TextView) rootView 
       .findViewById(R.id.section_label); 
     dummyTextView.setText(title); 
    } catch (IOException e) { 

    }    

Answer 1

检查我的答案在这里：NoClassDefFound solution

您需要在通过Eclipse项目/属性项目一些变化。

谢谢。

Answer 2

如果您正在使用库jar，而不是从某个其他位置引用它，请尝试将它放入libs文件夹中。之前为我工作过几次。

Answer 3

我在将项目从eclispe迁移到android studio时遇到了这个问题。此解决方案适用于我：

public class YouApplication extends Application { 

@Override 
protected void attachBaseContext(Context base) { 
    super.attachBaseContext(base); 
    MultiDex.install(this); 
} 
} 

自2014年12月3日起，build tools 1.0.0-rc1发布。现在，所有你需要做的是在你的应用类中重写此：

公共类YouApplication扩展应用{

@Override 
protected void attachBaseContext(Context base) { 
    super.attachBaseContext(base); 
    MultiDex.install(this); 
} 
} 

和修改您的build.gradle像这样：

android { 
compileSdkVersion 22 
buildToolsVersion "23.0.0" 

    defaultConfig { 
     minSdkVersion 14 //lower than 14 doesn't support multidex 
     targetSdkVersion 22 

     // Enabling multidex support. 
     multiDexEnabled true 
    } 
} 
dependencies { 
compile 'com.android.support:multidex:1.0.1'} 

参考： link