texttospeak接口说方法不工作

Question

我正在开发一个应用程序，其中当一个新的活动开始时，它应该说一些字，但在讲方法总是显示我空指针异常，但在谷歌搜索，它表明我可以通过空值。我的方法如下：

private void speakout(String textToSpeak) {   
    HashMap<String, String> myHashAlarm = new HashMap();   
    myHashAlarm.put(TextToSpeech.Engine.KEY_PARAM_STREAM, 
    String.valueOf(AudioManager.STREAM_ALARM));   
    tts.speak(textToSpeak, TextToSpeech.QUEUE_FLUSH, null); 
} 

这里是我的logcat输出：

11-21 12:14:18.985: I/System.out(307): ip : 10.184.211.143 11-21 
12:14:19.035: D/AndroidRuntime(307): Shutting down VM 11-21 
12:14:19.035: W/dalvikvm(307): threadid=1: thread exiting with 
uncaught exception (group=0x4001d800) 11-21 12:14:19.045: 
E/AndroidRuntime(307): FATAL EXCEPTION: main 11-21 12:14:19.045: 
E/AndroidRuntime(307): java.lang.RuntimeException: Unable to 
instantiate activity 
ComponentInfo{com.example.audiobus/com.example.audiobus.AudioBusActivity}: 
java.lang.NullPointerException 11-21 12:14:19.045: 
E/AndroidRuntime(307): at 
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2585) 
11-21 12:14:19.045: E/AndroidRuntime(307): at 
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 
11-21 12:14:19.045: E/AndroidRuntime(307): at 
android.app.ActivityThread.access$2300(ActivityThread.java:125) 11-21 
12:14:19.045: E/AndroidRuntime(307): at 
android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 
11-21 12:14:19.045: E/AndroidRuntime(307): at 
android.os.Handler.dispatchMessage(Handler.java:99) 11-21 
12:14:19.045: E/AndroidRuntime(307): at 
android.os.Looper.loop(Looper.java:123) 11-21 12:14:19.045: 
E/AndroidRuntime(307): at 
android.app.ActivityThread.main(ActivityThread.java:4627) 11-21 
12:14:19.045: E/AndroidRuntime(307): at 
java.lang.reflect.Method.invokeNative(Native Method) 11-21 
12:14:19.045: E/AndroidRuntime(307): at 
... 

我在那里我打电话说出来的方法和意图的事情第一次编辑.....

protected void onCreate(Bundle savedInstanceState) { 

      super.onCreate(savedInstanceState); 

     setContentView(R.layout.activity_audio_bus); 
     textView = (EditText) findViewById(R.id.ipEditText); 
     welcomeNote= (TextView) findViewById(R.id.welcomeTextView); 
     text = welcomeNote.getText().toString(); 
     text.concat(" , Please wait we are retriving information"); 
     System.out.println(text); 
     speakout(text); 
     Bundle bunble=getIntent().getExtras(); 
     if(bunble!=null){ 
       //Getting the value stored in the name "IP" 
      String IP=bunble.getString("IP"); 
      System.out.println(IP); 
        //appending the value to the contents of textView. 
      textView.append(" HI "+IP); 
      } 

     } 

Answer 1

//主要活动

Bundle bundle = new Bundle(); 
    bundle.putString("text-to-speak","Hello world!") 
    Intent intent = new Intent(<source_activity_context>,<destination_activity_class>); 
    intent.putExtras(bundle); 
startActivity(intent); 

//在目标活动

// onCreateMethod

Bundle bundle = getIntent().getExtras(); 
String textToSpeak = bundle.getString("text-to-speak"); 
Intent intent = new Intent(Engine.ACTION_CHECK_TTS_DATA); 
     startActivityForResult(intent, TTS_VAL_DATA); 

//声明其全球

TextToSpeech tts; 

//在onActivityResult

@Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent data) { 

     if (resultCode == Engine.CHECK_VOICE_DATA_PASS) { 

      Toast.makeText(this, "we can use TTS Engine", Toast.LENGTH_LONG) 
        .show(); 

      tts = new TextToSpeech(this, new OnInitListener() { 

       @Override 
       public void onInit(int status) { 

        if (status == TextToSpeech.SUCCESS) { 
         tts.setLanguage(Locale.US); 
         tts.setSpeechRate(1.1f); 
         tts.speak(textToSpeak, 
           TextToSpeech.QUEUE_ADD, null); 
        } 

       } 
      }); 

     } else { 
      Toast.makeText(this, "we can not use TTS Engine", Toast.LENGTH_LONG) 
        .show(); 

      Intent intent = new Intent(Engine.ACTION_INSTALL_TTS_DATA); 
      startActivity(intent); 

     } 

     super.onActivityResult(requestCode, resultCode, data); 
    } 

希望这有助于你。最好的问候...