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如何从另一个活动调用TextToSpeech活动?

text-to-speech android java

Beginner · 技术社区 · 7 年前

我有个活动( MainActivity )实现 TextToSpeech 而且效果很好。当按钮 onClick 被称为,它说出键入的任何内容 EditText

主要活动:

public class MainActivity extends AppCompatActivity implements TextToSpeech.OnInitListener{

    private TextToSpeech engine;
    private EditText text;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        text = (EditText) findViewById(R.id.text);
        engine = new TextToSpeech(this, this);

        Intent i=getIntent();
        Bundle b=i.getExtras();
        word=b.getString("word");
        speakText2(word);
    }

    // speakText is called by onClick button
    public void speakText(View v) {
        String textContents = text.getText().toString();
        engine.speak(textContents, TextToSpeech.QUEUE_FLUSH, null, null);
    }

    public void speakText2(String textContents) {
        engine.speak(textContents, TextToSpeech.QUEUE_ADD, null, null);
    }

    @Override
    public void onInit(int i) {
        if (i == TextToSpeech.SUCCESS) {
            //Setting speech Language
            engine.setLanguage(Locale.ENGLISH);
            engine.setPitch(1);
        }
    }
}

主要活动 从另一个活动中,传递一个字符串以大声说话。我试过:

MainActivity mainactivity = new MainActivity();
String word;
word = "speak";
mainactivity.speakText2(word); // Error

但是,获取错误:

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.speech.tts.TextToSpeech.speak(java.lang.CharSequence, int, android.os.Bundle, java.lang.String)' on a null object reference
at MainActivity.speakText2(TTSEngine.java:53)

我尝试使用其他活动的意图:

Intent intent = new Intent(this, MainActivity.class);
intent.putExtra("word", word);
startActivity(intent);

但是,获取错误:

I/TextToSpeech: Sucessfully bound to com.google.android.tts
W/TextToSpeech: speak failed: not bound to TTS engine
W/TextToSpeech: speak failed: not bound to TTS engine
W/TextToSpeech: speak failed: not bound to TTS engine
I/TextToSpeech: Connected to ComponentInfo{com.google.android.tts/com.google.android.tts.service.GoogleTTSService}
I/TextToSpeech: Set up connection to ComponentInfo{com.google.android.tts/com.google.android.tts.service.GoogleTTSService}

文本语音

W/TextToSpeech: speak failed: not bound to TTS engine
I/TextToSpeech: Connected to ComponentInfo{com.google.android.tts/com.google.android.tts.service.GoogleTTSService}
I/TextToSpeech: Set up connection to ComponentInfo{com.google.android.tts/com.google.android.tts.service.GoogleTTSService}

在剩下的时间里,它工作得很好。知道怎么解决吗?