使用 Recycler View 时如何在 Text To Speech 中实现错误处理

Posted 2023-04-19

【中文标题】使用 Recycler View 时如何在 Text To Speech 中实现错误处理

【英文标题】：How to Implement Error handling in Text To Speech while working with Recycler View

【发布时间】：2021-12-26 00:18:11

【问题描述】：

我将 TextToSpeech 从 Fragment 传递到我的 RecyclerView 适配器。 在传递的同时，我还发送了一个标志textToSpeechSupported，以确认TextToSpeech公告是否支持当前设置的设备语言。

但是每次这个标志的值被设置为false，即使我在onCreate中将值设置为true。 我的实现方法似乎有问题。

但我厌倦了调试并添加了日志。 我还进行了多次测试并尝试了各种其他组合。但是每次传递标志textToSpeechSupported 的值都是false，即使语言受支持。 我在这里错过了什么吗？

如果TextToSpeech 支持设备语言，我需要将标志textToSpeechSupported 的值设为true

请指导。

class WelcomeFragment : Fragment() 

    private lateinit var welcomeAdapter: WelcomeAdapter
    private lateinit var textToSpeech: TextToSpeech
    private var textToSpeechSupported: Boolean = false

    override fun onCreate(savedInstanceState: Bundle?) 
        super.onCreate(savedInstanceState)
        textToSpeech = TextToSpeech(requireContext())  status ->
            if (status == SUCCESS) 
                val result = textToSpeech.setLanguage(Locale.getDefault())
                textToSpeechSupported =
                    !(result == TextToSpeech.LANG_NOT_SUPPORTED || result == TextToSpeech.LANG_MISSING_DATA)
            
        
    

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) 
        super.onViewCreated(view, savedInstanceState)
        welcomeAdapter = WelcomeAdapter(textToSpeech, textToSpeechSupported)
        binding.adapter = welcomeAdapter 
        
    

class Welcomedapter(private val textToSpeech: TextToSpeech, private val textToSpeechSupported: Boolean) : ListAdapter<Welcome, ViewHolder>(WelcomeDiffCallback()) 

    //....

    class ViewHolder private constructor(val binding: ContainerWelcomeBinding) : RecyclerView.ViewHolder(binding.root) 
        fun bind(item: Welcome, textToSpeech: TextToSpeech, textToSpeechSupported: Boolean) 
            binding.apply 
                welcomeMessageText.text = item.welcome
                textToSpeechImage.setOnClickListener 
                    if (textToSpeechSupported) 
                        textToSpeech.speak(item.welcome, TextToSpeech.QUEUE_FLUSH, null)
                     else 
                        // Send an event for Toast saying that language is not supported for Text to Speech
                    
                
            
        
    

目的/目的是确保正确计算标志textToSpeechSupported 的值并将其传递给Recycler View Adapter。

【参考方案1】：

问题是 onViewCreated 在 tts 有时间初始化之前被调用，所以你太早访问 textToSpeechSupported 并且你总是得到你的默认 (false) 值。

所以，不要调用：

welcomeAdapter = WelcomeAdapter(textToSpeech, textToSpeechSupported)
binding.adapter = welcomeAdapter 

从 onViewCreated 内部，创建一个新函数：

fun thisFunctionRunsAFTERtheTTSisInitialized() 

    // put that code here instead.

然后从 onCreate 内部调用该函数，以便在 tts 初始化后运行：

override fun onCreate(savedInstanceState: Bundle?) 
        super.onCreate(savedInstanceState)
        textToSpeech = TextToSpeech(requireContext())  status ->
            if (status == SUCCESS) 
                val result = textToSpeech.setLanguage(Locale.getDefault())
                textToSpeechSupported =
                    !(result == TextToSpeech.LANG_NOT_SUPPORTED || result == TextToSpeech.LANG_MISSING_DATA)

                thisFunctionRunsAFTERtheTTSisInitialized() // <---------------

            
        
    

【讨论】：

谢谢。 （第 1 点）请注意，如果我将函数 thisFunctionRunsAFTERtheTTSisInitialized() 保留在 if statement 中，那么它只会在 textToSpeech 状态为 SUCCESS 时执行，如果状态不同，那么我们的 welcomeAdapter 将永远不会执行初始化。 （第2点）可以将回收器视图适配器初始化放在OnCreate中还是应该将其保留在onCreateView中

第 1 点，你是对的。不好意思我不知道第2点的答案，我的答案主要是为了说明tts初始化是异步和延迟的。我建议单独发布任何新问题，如果您这样做，请包括所有代码，包括包含该片段的活动。解决问题的方法可能完全不同。

【参考方案2】：

最好将接口或函数传递给适配器 例如

class Welcomedapter(private val block : () -> Unit) : ListAdapter<Welcome, ViewHolder>(WelcomeDiffCallback()) 

    //....

    class ViewHolder private constructor(val binding: ContainerWelcomeBinding) : RecyclerView.ViewHolder(binding.root) 
        fun bind(item: Welcome, textToSpeech: TextToSpeech, textToSpeechSupported: Boolean) 
            binding.apply 
                welcomeMessageText.text = item.welcome
                textToSpeechImage.setOnClickListener 
                    block()
                
            
        
    



override fun onViewCreated(view: View, savedInstanceState: Bundle?) 
    super.onViewCreated(view, savedInstanceState)
    welcomeAdapter = WelcomeAdapter 
        if (textToSpeechSupported) 
            textToSpeech.speak(item.welcome, TextToSpeech.QUEUE_FLUSH, null)
         else 
            // show the toast here now 
            
        
    
    binding.adapter = welcomeAdapter