如何在android项目中使用java Lucence库？

尽管我在build.gradle中集成了库，但是当我在设备上运行它时，会发生以下错误。如何在android项目中使用java Lucence库？

11-16 12:59:10.097 14630-14630/sadboy.antix E/AndroidRuntime: FATAL EXCEPTION: main 
    Process: sadboy.antix, PID: 14630 
    java.lang.NoClassDefFoundError: org.apache.lucene.util.AttributeSource$2 
     at org.apache.lucene.util.AttributeSource.<clinit>(AttributeSource.java:150) 
     at sadboy.antix.text_processing.KeywordsExtractor.getKeywordsList(KeywordsExtractor.java:34) 
     at sadboy.antix.activities.NewsArticle.onCreate(NewsArticle.java:51) 
     at android.app.Activity.performCreate(Activity.java:6010) 
     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1129) 
     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2292) 
     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2413) 
     at android.app.ActivityThread.access$800(ActivityThread.java:155) 
     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1317) 
     at android.os.Handler.dispatchMessage(Handler.java:102) 
     at android.os.Looper.loop(Looper.java:135) 
     at android.app.ActivityThread.main(ActivityThread.java:5343) 
     at java.lang.reflect.Method.invoke(Native Method) 
     at java.lang.reflect.Method.invoke(Method.java:372) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:700) 
11-16 13:04:10.197 14630-14630/sadboy.antix I/Process: Sending signal. PID: 14630 SIG: 9

我的代码看起来像这样， buidl.gradle

apply plugin: 'com.android.application' 

android { 
    compileSdkVersion 25 
    buildToolsVersion "25.0.0" 

    defaultConfig { 
     applicationId "sadboy.antix" 
     minSdkVersion 16 
     targetSdkVersion 25 
     versionCode 1 
     versionName "1.0" 
     testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" 
    } 

    buildTypes { 
     release { 
      minifyEnabled false 
      proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' 
     } 
    } 

} 

dependencies { 
    compile fileTree(dir: 'libs', include: ['*.jar']) 
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', { 
     exclude group: 'com.android.support', module: 'support-annotations' 
    }) 
    testCompile 'junit:junit:4.12' 

    compile 'com.android.support:appcompat-v7:25.0.0' 

    //Library for web scraping 
    compile 'org.jsoup:jsoup:1.10.1' 

    //Library for HTTP request 
    compile 'com.squareup.okhttp3:okhttp:3.4.2' 

    //Savage UX/UI libraries 
    compile 'com.mikhaellopez:circularfillableloaders:1.2.0' 
    compile 'com.squareup.picasso:picasso:2.5.2' 
    compile 'com.balysv:material-ripple:1.0.2' 
    compile('com.mikepenz:materialdrawer:[email protected]') { 
     transitive = true 
    } 

    //Lucence libraries for text processing 
    compile group: 'org.apache.lucene', name: 'lucene-core', version: '5.5.0' 
    compile group: 'org.apache.lucene', name: 'lucene-analyzers-common', version: '5.5.0' 

    //Essential google libraries 
    compile 'com.android.support:cardview-v7:25.0.0' 
    compile 'com.android.support:recyclerview-v7:25.0.0' 
    compile 'com.android.support:design:25.0.0' 
}

类在那里我使用Lucence

package sadboy.antix.text_processing; 

/** 
* Created by Varun Kumar on 11/15/2016. 
*/ 

import org.apache.lucene.analysis.TokenStream; 
import org.apache.lucene.analysis.core.LowerCaseFilter; 
import org.apache.lucene.analysis.core.StopFilter; 
import org.apache.lucene.analysis.en.EnglishAnalyzer; 
import org.apache.lucene.analysis.en.PorterStemFilter; 
import org.apache.lucene.analysis.miscellaneous.ASCIIFoldingFilter; 
import org.apache.lucene.analysis.standard.ClassicFilter; 
import org.apache.lucene.analysis.standard.StandardTokenizer; 
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute; 

import java.io.IOException; 
import java.io.StringReader; 
import java.util.Collection; 
import java.util.Collections; 
import java.util.HashSet; 
import java.util.LinkedList; 
import java.util.List; 
import java.util.Set; 

public class KeywordsExtractor { 

    public static List<CardKeyword> getKeywordsList(String fullText) throws IOException { 

     TokenStream tokenStream = null; 

     try { 

      fullText = fullText.replaceAll("-+", "-0"); 
      fullText = fullText.replaceAll("[\\p{Punct}&&[^'-]]+", " "); 
      fullText = fullText.replaceAll("(?:'(?:[tdsm]|[vr]e|ll))+\\b", ""); 

      StandardTokenizer stdToken = new StandardTokenizer(); 
      stdToken.setReader(new StringReader(fullText)); 

      tokenStream = new StopFilter(new ASCIIFoldingFilter(new ClassicFilter(new LowerCaseFilter(stdToken))), EnglishAnalyzer.getDefaultStopSet()); 
      tokenStream.reset(); 

      List<CardKeyword> cardKeywords = new LinkedList<>(); 

      CharTermAttribute token = tokenStream.getAttribute(CharTermAttribute.class); 

      while (tokenStream.incrementToken()) { 

       String term = token.toString(); 
       String stem = getStemForm(term); 

       if (stem != null) { 
        CardKeyword cardKeyword = find(cardKeywords, new CardKeyword(stem.replaceAll("-0", "-"))); 
        cardKeyword.add(term.replaceAll("-0", "-")); 
       } 
      } 

      Collections.sort(cardKeywords); 

      return cardKeywords; 
     } finally { 
      if (tokenStream != null) { 
       try { 
        tokenStream.close(); 
       } catch (IOException e) { 
        e.printStackTrace(); 
       } 
      } 
     } 
    } 


    private static String getStemForm(String term) throws IOException { 

     TokenStream tokenStream = null; 

     try { 
      StandardTokenizer stdToken = new StandardTokenizer(); 
      stdToken.setReader(new StringReader(term)); 

      tokenStream = new PorterStemFilter(stdToken); 
      tokenStream.reset(); 


      Set<String> stems = new HashSet<>(); 

      CharTermAttribute token = tokenStream.getAttribute(CharTermAttribute.class); 

      while (tokenStream.incrementToken()) { 
       stems.add(token.toString()); 
      } 


      if (stems.size() != 1) { 
       return null; 
      } 

      String stem = stems.iterator().next(); 

      if (!stem.matches("[a-zA-Z0-9-]+")) { 
       return null; 
      } 

      return stem; 
     } finally { 
      if (tokenStream != null) { 
       try { 
        tokenStream.close(); 
       } catch (IOException e) { 
        e.printStackTrace(); 
       } 
      } 
     } 
    } 


    private static <T> T find(Collection<T> collection, T sample) { 

     for (T element : collection) { 
      if (element.equals(sample)) { 
       return element; 
      } 
     } 

     collection.add(sample); 

     return sample; 
    } 
}

模型类

package sadboy.antix.text_processing; 

/** 
* Created by Varun Kumar on 11/15/2016. 
*/ 

import java.util.HashSet; 
import java.util.Set; 


public class CardKeyword implements Comparable<CardKeyword> { 


    private final String stem; 
    private final Set<String> terms = new HashSet<>(); 
    private int frequency; 

    public CardKeyword(String stem) { 
     this.stem = stem; 
    } 


    public void add(String term) { 
     this.terms.add(term); 
     this.frequency++; 
    } 

    @Override 
    public int compareTo(CardKeyword keyword) { 
     return Integer.valueOf(keyword.frequency).compareTo(this.frequency); 
    } 

    @Override 
    public int hashCode() { 
     return this.getStem().hashCode(); 
    } 


    @Override 
    public boolean equals(Object o) { 

     if (this == o) return true; 

     if (!(o instanceof CardKeyword)) return false; 

     CardKeyword that = (CardKeyword) o; 

     return this.getStem().equals(that.getStem()); 
    } 


    public String getStem() { 
     return this.stem; 
    } 


    public Set<String> getTerms() { 
     return this.terms; 
    } 


    public int getFrequency() { 
     return this.frequency; 
    } 
}

活动其中这一切开始

package sadboy.antix.activities; 

import android.os.Bundle; 
import android.support.v7.app.AppCompatActivity; 
import android.util.Log; 

import java.io.IOException; 
import java.util.List; 

import sadboy.antix.R; 
import sadboy.antix.text_processing.CardKeyword; 
import sadboy.antix.text_processing.KeywordsExtractor; 

public class NewsArticle extends AppCompatActivity { 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_news_article); 

    String input = "Pick Flick is your ultimate app to find information about Movies, TV shows and Celebrities fast and easily on the go\n" + 
      "\n" + 
      "• Quick access of popular, top rated, now playing, highest grossing and upcoming movies\n" + 
      "• Quick access of popular, top rated, airing today and on air TV shows\n" + 
      "• View the cast of movies and TV shows\n" + 
      "• Similar Movies and TV shows to watch to explore more on the basis of your search\n" + 
      "• Find the movies or TV shows done by a celebrity\n" + 
      "• Set reminders and bookmarks so you never forget or miss anything you like\n" + 
      "• Share everything with your friends and family to plan movies or just watch a TV show maybe\n" + 
      "• List of trending celebrities\n" + 
      "• All the information and rating of Movies, TV shows and Celebrities on the go\n" + 
      "• Fast and easy search with keywords and suggestions\n" + 
      "• Fluid and easy to use UI enabling for glitch free experience\n" + 
      "\n" + 
      "• Like Pick Flick on Facebook\n" + 
      "• https://www.facebook.com/pickflickapp\n" + 
      "\n" + 
      "• Follow Pick Flick on Instagram\n" + 
      "• https://www.instagram.com/pickflickapp/\n" + 
      "\n" + 
      "• Pick Flick uses data and images by TMDb licensed under CC BY-NC 4.0\n" + 
      "• https://creativecommons.org/licenses/by-nc/4.0/\n" + 
      "\n" + 
      "• Pick Flick uses the TMDb API but is not endorsed or certified by TMDb\n" + 
      "• https://www.themoviedb.org/documentation/api/terms-of-use"; 


    List<CardKeyword> keywordsList = null; 
    try { 
     keywordsList = KeywordsExtractor.getKeywordsList(input); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 

    int i; 

    for(i = 0;i<keywordsList.size();i++) 
    { 
     Log.d("Keyword",i+" "+keywordsList.get(i).getStem()); 
    } 
}

}

来源

2016-11-16 Varun Kumar

参阅http://stackoverflow.com/questions/39318611/java-lang-exception-java-lang-noclassdeffounderror-org-apache-lucene-util-open – sasikumar

PLS与添加此检查：

https://mvnrepository.com/artifact/org.apache.lucene/lucene-backward-codecs //

compile group: 'org.apache.lucene', name: 'lucene-backward-codecs', version: '5.5.0'

来源

2016-11-16 08:40:33

仍然收到相同的错误 –

检查lucene核心与另一个版本，而不是5.5.0 –

我做了，然后它给了我使用另一个版本的Java的错误。它没有发生。 –

如何在android项目中使用java Lucence库？

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