InputStream总是返回nullpointerexception

SentenceModel model = null; 
    InputStream modelIn = null; 

    AssetManager assManager = context.getAssets(); 

    try { 
     modelIn = assManager.open("en-sent.bin"); 
     model = new SentenceModel(modelIn); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } finally { 
     if (modelIn != null) { 
      try { 
       modelIn.close(); 
      } catch (IOException e) { 
       e.printStackTrace(); 
      } 
     } 
    } 

    //initializes sentence detector 
    SentenceDetectorME sentenceDetector = new SentenceDetectorME(model); 

//Stacktrace 
08-03 14:25:23.842 27210-27210/com.gigstudios.newssummary W/System.err: java.io.FileNotFoundException: en-sent.bin 
08-03 14:25:23.842 27210-27210/com.gigstudios.newssummary W/System.err:  at android.content.res.AssetManager.openAsset(Native Method) 
08-03 14:25:23.842 27210-27210/com.gigstudios.newssummary W/System.err:  at android.content.res.AssetManager.open(AssetManager.java:313) 
08-03 14:25:23.842 27210-27210/com.gigstudios.newssummary W/System.err:  at android.content.res.AssetManager.open(AssetManager.java:287) 
08-03 14:25:23.842 27210-27210/com.gigstudios.newssummary W/System.err:  at com.gigstudios.newssummary.WordCounter.makeSentences(WordCounter.java:35) 
08-03 14:25:23.842 27210-27210/com.gigstudios.newssummary W/System.err:  at com.gigstudios.newssummary.Article.<init>(Article.java:19) 
08-03 14:25:23.842 27210-27210/com.gigstudios.newssummary W/System.err:  at com.gigstudios.newssummary.ArticleReceiver.receiveNewsArticles(ArticleReceiver.java:87) 
08-03 14:25:23.842 27210-27210/com.gigstudios.newssummary W/System.err:  at com.gigstudios.newssummary.ArticleReceiver.<init>(ArticleReceiver.java:37) 
08-03 14:25:23.842 27210-27210/com.gigstudios.newssummary W/System.err:  at com.gigstudios.newssummary.MainActivity.fetchNews(MainActivity.java:114) 
08-03 14:25:23.842 27210-27210/com.gigstudios.newssummary W/System.err:  at com.gigstudios.newssummary.MainActivity$1.run(MainActivity.java:52) 
08-03 14:25:23.843 27210-27210/com.gigstudios.newssummary W/System.err:  at android.os.Handler.handleCallback(Handler.java:746) 
08-03 14:25:23.843 27210-27210/com.gigstudios.newssummary W/System.err:  at android.os.Handler.dispatchMessage(Handler.java:95) 
08-03 14:25:23.843 27210-27210/com.gigstudios.newssummary W/System.err:  at android.os.Looper.loop(Looper.java:148) 
08-03 14:25:23.843 27210-27210/com.gigstudios.newssummary W/System.err:  at android.app.ActivityThread.main(ActivityThread.java:5443) 
08-03 14:25:23.843 27210-27210/com.gigstudios.newssummary W/System.err:  at java.lang.reflect.Method.invoke(Native Method) 
08-03 14:25:23.843 27210-27210/com.gigstudios.newssummary W/System.err:  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728) 
08-03 14:25:23.843 27210-27210/com.gigstudios.newssummary W/System.err:  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 
08-03 14:25:23.843 27210-27210/com.gigstudios.newssummary D/AndroidRuntime: Shutting down VM 
08-03 14:25:23.844 27210-27210/com.gigstudios.newssummary E/AndroidRuntime: FATAL EXCEPTION: main 
                      Process: com.gigstudios.newssummary, PID: 27210 
                      java.lang.NullPointerException: Attempt to invoke virtual method 'opennlp.tools.sentdetect.SentenceDetectorFactory opennlp.tools.sentdetect.SentenceModel.getFactory()' on a null object reference 
                       at opennlp.tools.sentdetect.SentenceDetectorME.<init>(SentenceDetectorME.java:86) 
                       at com.gigstudios.newssummary.WordCounter.makeSentences(WordCounter.java:50) 
                       at com.gigstudios.newssummary.Article.<init>(Article.java:19) 
                       at com.gigstudios.newssummary.ArticleReceiver.receiveNewsArticles(ArticleReceiver.java:87) 
                       at com.gigstudios.newssummary.ArticleReceiver.<init>(ArticleReceiver.java:37) 
                       at com.gigstudios.newssummary.MainActivity.fetchNews(MainActivity.java:114) 
                       at com.gigstudios.newssummary.MainActivity$1.run(MainActivity.java:52) 
                       at android.os.Handler.handleCallback(Handler.java:746) 
                       at android.os.Handler.dispatchMessage(Handler.java:95) 
                       at android.os.Looper.loop(Looper.java:148) 
                       at android.app.ActivityThread.main(ActivityThread.java:5443) 
                       at java.lang.reflect.Method.invoke(Native Method) 
                       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728) 
                       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)

我一直在试图解决这个问题几个小时，并没有得到任何地方。在上面的代码中，示例模型始终为空，并且en-sent.bin文件似乎没有读入modelIn对象中。我的bin文件当前位于资产文件夹中。任何帮助是极大的赞赏。InputStream总是返回nullpointerexception

来源

2016-08-03 Jared

请编辑您的问题并发布与您的异常相关的Java堆栈跟踪。 – CommonsWare

请在问题中添加stacktrace。 – Julian

@Julian我添加了堆栈跟踪。 – Jared

-1

您需要：

BufferedReader reader = null; 
StringBuilder sbuilder = new StringBuilder(); 
    try { 
     reader = new BufferedReader(
      new InputStreamReader(getAssets().open("en-sent.bin"))); 

     // read 
     String mLine; 
     while ((mLine = buffer.readLine()) != null) { 
        sbuilder.append(mLine); 
     } 
    } catch (IOException e) { 
//log 
    } finally { 
     if (reader != null) { 
      try { 
       reader.close(); 
      } catch (IOException e) { 
//log 
      } 
     } 
    }

来源

2016-08-03 21:48:08 Jason

请解释他们为什么需要这样做，以及它与当前代码所看到的异常之间的关系。 –

@Jason什么是“sbuilder”和“buffer”？我不明白如何将其实现到我的代码中。 – Jared

我编辑了代码，如果你想打开一个资产文件到InputStream就像你的例子， InputStream modelIn = null; AssetManager assManager = context.getAssets（）; modelIn = assManager.open（“en-sent.bin”）; 您需要使用InputStreamReader读取它在sbuilder中，您将文件中的所有数据都设置为字符串，以便您可以读取它; – Jason

我发现了一个简单的解决方案！我把bin文件中的 “原始” 目录...

相反的：

 modelIn = assManager.open("en-sent.bin"); 
     model = new SentenceModel(modelIn);

用途：

 modelIn = context.getResources().openRawResource(R.raw.en_sent); 
     model = new SentenceModel(modelIn);

完美的作品！

来源

2016-08-05 03:22:53 Jared

InputStream总是返回nullpointerexception

回答

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