Java 在Pocketsphinx演示中切换到搜索时出现空指针异常

我想用android开发一个语音识别器。我在android设备中使用过语音识别功能。
这是我的密码：
MainActivity.java:

package com.example.pocket_sphinx;

import edu.cmu.pocketsphinx.Hypothesis;
import edu.cmu.pocketsphinx.RecognitionListener;
import android.os.Bundle;
import android.app.Activity;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import static android.widget.Toast.makeText;
import static edu.cmu.pocketsphinx.SpeechRecognizerSetup.defaultSetup;
import android.os.AsyncTask;
import android.util.Log;
import android.widget.TextView;
import android.widget.Toast;
import edu.cmu.pocketsphinx.Assets;
import edu.cmu.pocketsphinx.SpeechRecognizer;

public class MainActivity extends Activity implements RecognitionListener {

       private static final String KWS_SEARCH = "wakeup";
        private static final String DICTATION_SEARCH = "digits";

        private static final String KEYPHRASE = "oh mighty computer";

        private SpeechRecognizer recognizer;
        private HashMap<String, Integer> captions;

        @Override
        public void onCreate(Bundle state) {
            super.onCreate(state);

            // Prepare the data for UI
            captions = new HashMap<String, Integer>();

            setContentView(R.layout.activity_main);
            ((TextView) findViewById(R.id.caption_text))
                    .setText("Preparing the recognizer");

            // Recognizer initialization is a time-consuming and it involves IO,
            // so we execute it in async task

            new AsyncTask<Void, Void, Exception>() {
                @Override
                protected Exception doInBackground(Void... params) {
                    try {
                        Assets assets = new Assets(MainActivity.this);

                        File assetDir = assets.syncAssets();

                        setupRecognizer(assetDir);

                        recognizer.startListening(KWS_SEARCH);

                    } catch (IOException e) {
                        return e;
                    }
                    return null;
                }

                @Override
                protected void onPostExecute(Exception result) {
                    if (result != null) {
                        ((TextView) findViewById(R.id.caption_text))
                                .setText("Failed to init recognizer " + result);
                    } else {
                        switchSearch(KWS_SEARCH);
                    }
                }
            }.execute();
        }

        @Override
        public void onPartialResult(Hypothesis hypothesis) {
            String text = hypothesis.getHypstr();
            Log.d("Spoken text",text);

            if (text.equals(KEYPHRASE))
                switchSearch(DICTATION_SEARCH);

            else
                ((TextView) findViewById(R.id.result_text)).setText(text);
        }

        @Override
        public void onResult(Hypothesis hypothesis) {
            ((TextView) findViewById(R.id.result_text)).setText("");
            if (hypothesis != null) {
                String text = hypothesis.getHypstr();
                makeText(getApplicationContext(), text, Toast.LENGTH_SHORT).show();
            }
        }

        @Override
        public void onBeginningOfSpeech() {
        }

        @Override
        public void onEndOfSpeech() {
            Log.d("end","In end of speech");
            if (DICTATION_SEARCH.equals(recognizer.getSearchName()))
                switchSearch(KWS_SEARCH);
        }

        private void switchSearch(String searchName) {
            recognizer.stop();
            recognizer.startListening(searchName);
            String caption = getResources().getString(captions.get(searchName));
            ((TextView) findViewById(R.id.caption_text)).setText(caption);
        }

        private void setupRecognizer(File assetsDir) {
            File modelsDir = new File(assetsDir, "models");
            recognizer = defaultSetup()
                    .setAcousticModel(new File(modelsDir, "hmm/en-us"))
                    .setDictionary(new File(modelsDir, "dict/cmu07a.dic"))
                    .setRawLogDir(assetsDir).setKeywordThreshold(1e-20f)
                    //.setFloat("-beam", 1e-30f)
                    .getRecognizer();
            recognizer.addListener(this);

            // Create keyword-activation search.
            recognizer.addKeyphraseSearch(KWS_SEARCH, KEYPHRASE);

            // Create language model search.
            File languageModel = new File(modelsDir, "lm/weather.dmp");
            recognizer.addNgramSearch(DICTATION_SEARCH, languageModel);
        }
    }

---

您的代码有两个问题：

1） 您在doInBackground中开始搜索，然后在onPostExecute中再次开始相同的搜索，您可以在onPostExecute中调用switchSearch，这就足够了

2） 您不填充标题数组，但在switchSearch方法中使用它。所以您得到了空指针异常。你可以发表评论

        String caption = getResources().getString(captions.get(searchName));
        ((TextView) findViewById(R.id.caption_text)).setText(caption);

---

在switchSearch中，如果您不打算使用标题

，则实际错误在logcat的上面几行。您需要发布完整的日志，而不是日志的一部分。@NikolayShmyrev感谢您的关注！我修改了it@NikolayShmyrev此应用程序必须通过麦克风或文件识别语音？应用程序必须识别来自麦克风的语音。您的logcat与您发布的代码不匹配。在日志中切换到名为“wakeup”的搜索，而在代码中根本没有这样的搜索。您可能还需要粘贴相关代码。@NikolayShmyrev，我编辑了代码。谢谢你的宝贵意见

        String caption = getResources().getString(captions.get(searchName));
        ((TextView) findViewById(R.id.caption_text)).setText(caption);