文本到語音產生錯誤

Question

所以我試圖實現文本到語音到我的應用程序有史以來第一次。講話被調用時，我仍然會有一個錯誤的想法。下面是我收到的日誌：

01-23 18:52:29.825: E/AndroidRuntime(24380): FATAL EXCEPTION: main 
01-23 18:52:29.825: E/AndroidRuntime(24380): Process: com.rcd.league, PID: 24380 
01-23 18:52:29.825: E/AndroidRuntime(24380): java.lang.NullPointerException 
01-23 18:52:29.825: E/AndroidRuntime(24380): at com.rcd.league.speakActivity.speakOut(speakActivity.java:60) 
01-23 18:52:29.825: E/AndroidRuntime(24380): at com.rcd.league.spawnTimers$15.onClick(Timers.java:350) 
01-23 18:52:29.825: E/AndroidRuntime(24380): at android.view.View.performClick(View.java:4442) 
01-23 18:52:29.825: E/AndroidRuntime(24380): at android.view.View$PerformClick.run(View.java:18423) 
01-23 18:52:29.825: E/AndroidRuntime(24380): at android.os.Handler.handleCallback(Handler.java:733) 
01-23 18:52:29.825: E/AndroidRuntime(24380): at android.os.Handler.dispatchMessage(Handler.java:95) 
01-23 18:52:29.825: E/AndroidRuntime(24380): at android.os.Looper.loop(Looper.java:137) 
01-23 18:52:29.825: E/AndroidRuntime(24380): at android.app.ActivityThread.main(ActivityThread.java:5083) 
01-23 18:52:29.825: E/AndroidRuntime(24380): at java.lang.reflect.Method.invokeNative(Native Method) 
01-23 18:52:29.825: E/AndroidRuntime(24380): at java.lang.reflect.Method.invoke(Method.java:515) 
01-23 18:52:29.825: E/AndroidRuntime(24380): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777) 
01-23 18:52:29.825: E/AndroidRuntime(24380): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593) 
01-23 18:52:29.825: E/AndroidRuntime(24380): at dalvik.system.NativeStart.main(Native Method) 

這裏是我的代碼：

package com.rcd.league; 

import java.util.Locale; 

import android.app.Activity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.speech.tts.TextToSpeech; 
import android.util.Log; 

public class speakActivity extends Activity implements TextToSpeech.OnInitListener { 

    private int MY_DATA_CHECK_CODE = 0; 
    private TextToSpeech tts; 


    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     Intent checkTTSIntent = new Intent(); 
     checkTTSIntent.setAction(TextToSpeech.Engine.ACTION_CHECK_TTS_DATA); 
     startActivityForResult(checkTTSIntent, MY_DATA_CHECK_CODE); 
     tts = new TextToSpeech(this, this); 
    } 

    @Override 
    public void onDestroy() { 
     // Don't forget to shutdown tts! 
     if (tts != null) { 
      tts.stop(); 
      tts.shutdown(); 
     } 
     super.onDestroy(); 
    } 

    @Override 
    public void onInit(int status) { 

     if (status == TextToSpeech.SUCCESS) { 

      int result = tts.setLanguage(Locale.US); 

      if (result == TextToSpeech.LANG_MISSING_DATA 
        || result == TextToSpeech.LANG_NOT_SUPPORTED) { 
       Log.e("TTS", "This Language is not supported"); 
      } else { 
       speakOut(); 
      } 

     } else { 
      Log.e("TTS", "Initilization Failed!"); 
     } 

    } 

    public void speakOut() { 

     String text = "test"; 

     tts.speak(text, TextToSpeech.QUEUE_FLUSH, null); 
    } 



} 

我打電話SPEAKOUT（）;來自另一項活動。下面是代碼片段：

speakActivity speak = new speakActivity(); 

...

bt.setOnClickListener(new OnClickListener() { 

        @Override 
        public void onClick(View v) { 
        if (btTimer.getText().toString().contains(":50")){ 
         cd[0].start(); 
         speak.speakOut(); 

        } else { 
         cd[0].cancel(); 
         cd[0].onFinish(); 
        } 

       } 
      }); 

任何幫助將不勝感激！ 謝謝！

編輯：我也曾嘗試QUEUE_ADD而不是QUEUE_FLUSH並沒有工作之一：您創建的speakActivity活動/

Answer 1

，但你已經發布的代碼你從來沒有開始活動。由於該活動從未開始，因此從未調用onCreate()，因此tts未初始化。這就是爲什麼你得到一個NullPointerException，當你在speakOut()調用

tts.speak(text, TextToSpeech.QUEUE_FLUSH, null); 

。

更多信息請參閱有關何時onCreate()被稱爲這個計算器的問題：Is onCreate called when an Activity object is created?