如何访问布局TTS OnUtteranceCompleted回调？ [英] How to access layout in TTS OnUtteranceCompleted callback?

问题描述

我正在运行助记符或数学练习用于训练目的一个简单的Andr​​oid程序。
我有一个新的练习按钮，改变问题和答案。我想实现一个文本到语音模式，其中软件读取问题和答案。他们发言后，就应该算一个新的问题，然后重新开始。

I am making a simple Android program that runs mnemonics or math exercises for training purposes. I have a "new exercise" button that changes question and answer. I want to implement a "text to speech" mode, where the software reads the question and the answer. After they are spoken, it should calculate a new question and start again.

我使用OnUtteranceCompleted，以确定是否演讲已经结束。我的问题是我无法从回调访问我的新运动按钮。

I am using OnUtteranceCompleted to determine if the speech has ended. My problem is that I can’t access my "new exercise" button from the callback.

我使用这样的：

private TextToSpeech.OnUtteranceCompletedListener onUtteranceCompleted = new TextToSpeech.OnUtteranceCompletedListener()
{
        @Override
        public void onUtteranceCompleted(String utteranceId)
        {
                if(0 == utteranceId.compareToIgnoreCase(END_OF_SPEECH))
                {
                        Log.i("TTS","Completed");
                        if (TTSMode == TTS_MODE_ON) {
                            //Start new
                             Log.i("TTS","TTS mode is on: start new exercize");
                            NewExercize();
                             btnNewEx.performClick();

                        }
                }

        }
};

我得到了以下错误：
$ CalledFromWrongThreadException：只有创建视图层次可以触摸其观点原来的线程

I got the following error: $CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.

我能够产生新的问题/答案，但我不能使用该按钮与新的问题或答案，至极改变字段使用TTS引擎。

I am able to generate the new question/answer, but I can’t use the button to change the fields with the new question or answer, wich are used by the TTS engine.

任何想法？

推荐答案

您需要使用 runOnUiThread ：

context.runOnUiThread( new Runnable() {
    public void run() {
        btnNewEx.performClick();
    }
});

（可以省略背景。如果这是一个活动或服务子类）

(you can omit "context." if "this" is an Activity or Service subclass)

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