java - 文本转语音产生错误

Question

因此，我第一次尝试在我的应用程序中实现文本转语音。当演讲被召集时，我仍然有一个错误的想法。这是我收到的日志:

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)

这是我的代码:

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);
    }



}

我正在调用speakOut();来自另一项 Activity 。这是该代码的剪辑:

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();
                    }

                }
            });

任何帮助将不胜感激! 谢谢!

编辑:我也尝试过 QUEUE_ADD 而不是 QUEUE_FLUSH，但这也不起作用:/

Answer 1

您创建了 speakActivity Activity，但在您发布的代码中您从未启动该 Activity。由于该 Activity 从未启动，因此从未调用 onCreate()，因此 tts 未初始化。这就是为什么在调用时会收到 NullPointerException

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

在speakOut()中。

有关何时调用 onCreate() 的更多信息，请参阅此 stackoverflow 问题:Is onCreate called when an Activity object is created?