android - 尝试在 setOnUtteranceProgressListener 中调用 Toaster 或自定义函数

Question

在我的主 Fragment 中，我实现了 TextToSpeech mainFragment extends Fragment implements TextToSpeech.OnInitListener。

文本转语音工作正常，我还添加了一个正在工作的 UtteranceProgressListener。

我的问题:我无法调用任何自定义函数，例如 gotoNextChapter() 甚至是简单的 Toaster。出现错误 Can't create handler inside thread that has not called Looper.prepare()

欢迎提出任何建议或解决方案....

我的代码 fragment :

UtteranceProgressListener SpeechListener = new UtteranceProgressListener() {
            @Override
            public void onStart(String utteranceId) {
                Toast.makeText(getActivity(),utteranceId, Toast.LENGTH_LONG).show();
            }

            @Override
            public void onDone(String utteranceId) {
                Toast.makeText(getActivity(),utteranceId, Toast.LENGTH_LONG).show();

                gotoNextChapter(); <====function I want to call
                read_mode = 0;
            }

            @Override
            public void onError(String utteranceId) {
                Toast.makeText(getActivity(),utteranceId, Toast.LENGTH_LONG).show();
            }
        };

设置话语完整的监听器:

myTTS.setOnUtteranceProgressListener(SpeechListener);

获取错误:

Caught a RuntimeException from the binder stub implementation.
java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
                                                            at
android.os.Handler.<init>(Handler.java:209)
                                                            at
android.os.Handler.<init>(Handler.java:123)
                                                            at
android.widget.Toast$TN.<init>(Toast.java:350)
                                                            at
android.widget.Toast.<init>(Toast.java:106)
                                                            at
android.widget.Toast.makeText(Toast.java:264)
                                                            at com.MainActivity$Read$10.onDone(MainActivity.java:1252)

Answer 1

好的，我有一个解决方案，现在我的问题看起来微不足道了

我更新后的代码如下所示:

@Override
public void onDone(String utteranceId) {

runOnUiThread(new Runnable() {

                public void run() {
                    Toast.makeText(getContext(),utteranceId,Toast.LENGTH_LONG).show();
gotoNextChapter(); <====function I want to call
read_mode = 0;
                }
            });
}

在此感谢这些家伙: How can I Toast after Text to Speech finish speaking Android和 When may we need to use runOnUiThread in android application?