尝试在 setOnUtteranceProgressListener 中调用 Toaster 或自定义函数

Question

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

文本转语音功能正常，我还添加了一个 UtteranceProgressListener 功能。

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。收到错误 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....

我的代码片段：

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.onDone(MainActivity.java:1252)

Answer 1

好的，我找到了解决方案，现在我的问题似乎微不足道

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;
                }
            });
}

感谢这里的这些家伙：和 When may we need to use runOnUiThread in android application?

Answer 2

如果你在 Activity:

runOnUiThread(new Runnable() {
    @Override
    public void run() { 
        Toast.makeText(getActivity(),"...", Toast.LENGTH_LONG).show();  
    }
});

如果你在片段中：

getActivity().runOnUiThread(new Runnable() {
    @Override
    public void run() {
        Toast.makeText(getActivity(),"...", Toast.LENGTH_LONG).show();         
    }
});

否则你可以这样做：

Handler mainHandler = new Handler(context.getMainLooper());

Runnable myRunnable = new Runnable() {
    @Override 
    public void run() {
        Toast.makeText(getActivity(),"...", Toast.LENGTH_LONG).show();  
    } 
};
mainHandler.post(myRunnable);

尝试在 setOnUtteranceProgressListener 中调用 Toaster 或自定义函数

Trying to call Toaster or Custom function inside setOnUtteranceProgressListener

android

text-to-speech

listener