Question

我正在研究应用程序，当新活动开始时，它应该说一些单词但是说话方法总是显示我的空指针异常，但在谷歌搜索，它告诉我，我们可以传递空值。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
...

我的第一个编辑，我打电话说出方法和意图的事情......

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

//在主要活动中

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);

//在目标活动中

// 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);

//全局声明

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);
    }

希望这会对你有所帮助。最好的问候......

texttospeak界面说话方法不起作用

1 个答案: