speach.speak throwing null Указатель исключений

Question

Я написал это приложение, на самом деле я хотел предоставить функциональность слова. Но после добавления этого текста говорить не работает. Я получаю исключение null-указателя в speech.speak (текст, TextToSpeech.QUEUE_FLUSH, null);

import java.io.File; 
import java.util.ArrayList; 
import java.util.List; 
import java.util.Locale; 
import java.util.Random; 

import android.annotation.SuppressLint; 
import android.app.Activity; 
import android.content.Context; 
import android.content.Intent; 
import android.os.Bundle; 
import android.speech.tts.TextToSpeech; 
import android.text.Html; 
import android.text.method.ScrollingMovementMethod; 
import android.util.Log; 
import android.view.Gravity; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.ImageButton; 
import android.widget.TextView; 


@SuppressLint("NewApi") 
public class BestQuotes_MainActivity extends Activity implements OnClickListener,TextToSpeech.OnInitListener 
{ 
    int IMAGE_FIRST = 0; 
    int IMAGE_LAST = 40; 
    int CURRENT_IMAGE = 0; 

    private String m_sText = null; 
    private TextToSpeech speech; 

    List<String> quotes = new ArrayList(); 
    Context mContext = null; 
    ImageButton bSpeakerButton; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_best_quotes_main); 
     mContext = getBaseContext(); 
     quotes = (new LoadContents()).populateList(); 
     addImages(); 
     Button bShareButton = (Button) findViewById(R.id.shareButton); 
     bSpeakerButton = (ImageButton) findViewById(R.id.speaker); 
     bShareButton.setOnClickListener(this); 
     bSpeakerButton.setOnClickListener(new View.OnClickListener() { 

      @Override 
      public void onClick(View arg0) { 
       speak(); 
      } 

     }); 
    } 

    private void speak() 
    { 
     String text = getText(); 
     speech.speak(text, TextToSpeech.QUEUE_FLUSH, null); //throwing null pointer exception here 
    } 
    private void addImages() { 

     Random rand = new Random(); 
     int randomNum = rand.nextInt(quotes.size() - 1 - IMAGE_FIRST + 1) 
     + IMAGE_FIRST; 
     CURRENT_IMAGE = randomNum; 

     Log.e("CNH", "Rand value=" + randomNum); 

     TextView tv = (TextView) findViewById(R.id.quote); 
     tv.setMovementMethod(new ScrollingMovementMethod()); 
     tv.setTextSize(20); 
     tv.setGravity(Gravity.LEFT|Gravity.CENTER_VERTICAL); 

     String text = quotes.get(randomNum); 
     setText(text); 
     text = text.replace("\n", "<br />"); 
     tv.setGravity(Gravity.LEFT|Gravity.CENTER_VERTICAL); 
     tv.setText(Html.fromHtml("<b>" + getText() + "</b>")); 


     ImageButton imgNext = (ImageButton) findViewById(R.id.imgnext); 
     ImageButton imgPrevious = (ImageButton) findViewById(R.id.imgprevious); 

     imgNext.setImageResource(R.drawable.next); 
     imgPrevious.setImageResource(R.drawable.previous); 
     findViewById(R.id.imgnext).setOnClickListener(new HandleClick()); 
     findViewById(R.id.imgprevious).setOnClickListener(new HandleClick()); 
    } 

    private class HandleClick implements OnClickListener { 
     public void onClick(View view) { 
      if (view.getId() == findViewById(R.id.imgnext).getId()) { 

       int id = getNextImageNumber(1); 

       TextView tv; 
       tv = (TextView) findViewById(R.id.quote); 
       tv.setTextSize(20); 

       String text = quotes.get(id); 
       setText(text); 
       text = text.replace("\n", "<br />"); 
       tv.setGravity(Gravity.LEFT|Gravity.CENTER_VERTICAL); 
       tv.setText(Html.fromHtml("<b>" + text + "</b>")); 

      } else if (view.getId() == findViewById(R.id.imgprevious).getId()) { 

       int id = getNextImageNumber(2); 

       TextView tv = (TextView) findViewById(R.id.quote); 
       tv.setMovementMethod(new ScrollingMovementMethod()); 
       tv.setTextSize(20); 


       String text = quotes.get(id); 
       text = text.replace("\n", "<br />"); 
       setText(text); 
       tv.setGravity(Gravity.LEFT|Gravity.CENTER_VERTICAL); 
       tv.setText(Html.fromHtml("<b>" + text + "</b>")); 

      } 
     } 

    } 

    public int getNextImageNumber(int nextOrPrevious) { 
     IMAGE_LAST = quotes.size() - 1; 
     if (nextOrPrevious == 1) { 
      if (CURRENT_IMAGE == IMAGE_LAST) { 
       CURRENT_IMAGE = IMAGE_FIRST; 
      } else { 
       CURRENT_IMAGE = CURRENT_IMAGE + 1; 
      } 
     } else { 
      if (CURRENT_IMAGE == IMAGE_FIRST) { 
       CURRENT_IMAGE = IMAGE_LAST; 
      } else { 
       CURRENT_IMAGE = CURRENT_IMAGE - 1; 
      } 
     } 
     return CURRENT_IMAGE; 
    } 

    public void onBackPressed() 
    { 
     finish(); 
    } 

    public void deleteDir(File dir) { 
     if (dir != null && dir.isDirectory()) { 
      try { 
       File[] children = dir.listFiles(); 
       if (children.length > 0) { 
        for (int i = 0; i < children.length; i++) { 
         File[] temp = children[i].listFiles(); 
         for (int x = 0; x < temp.length; x++) { 
          temp[x].delete(); 
         } 
        } 
       } 
      } catch (Exception e) { 
       Log.e("Cache", "failed cache clean"); 
      } 
     } 
    } 

    public void downloadUrl(View v) { 
     String url = ""; 
     // int url = 1; 
     Log.e("Clicked1", "" + v.getTag()); 

    } 

    @Override 
    public void onClick(View v) 
    { 
     Intent iShare = new Intent(android.content.Intent.ACTION_SEND); 
     iShare.putExtra(android.content.Intent.EXTRA_TEXT, getText()); 
     iShare.setType("text/plain"); 
     startActivity(Intent.createChooser(iShare, "select any from the list:")); 
     /*finish();*/ 

    } 

    public void setText(String sText) 
    { 
     this.m_sText = sText; 
    } 

    public String getText() 
    { 
     return m_sText; 
    } 

    @Override 
    public void onDestroy() 
    { 
     if (speech != null) { 
      speech.stop(); 
      speech.shutdown(); 
     } 
     super.onDestroy(); 
    } 

    @Override 
    public void onInit(int status) 
    { 
     if (status == TextToSpeech.SUCCESS) 
     { 
      int result = speech.setLanguage(Locale.US); 
      if (result == TextToSpeech.LANG_MISSING_DATA 
        || result == TextToSpeech.LANG_NOT_SUPPORTED) { 
       Log.e("TTS", "This Language is not supported"); 
      } 
      else 
      { 
       bSpeakerButton.setEnabled(true); 
       speak(); 
      } 
     } 
     else 
     { 
      Log.e("TTS", "Initilization Failed!"); 
     } 
    } 
} 

Answer 1

Это много кода, чтобы полистать, но я не верю, что вы устанавливаете переменную речи в любом месте. Вы должны создать объект речи, прежде чем вы сможете вызвать его методы.