android - Flutter Plugin : crash_dump. cpp:无法附加到线程 185:权限被拒绝

Question

我正在开发一个 Flutter 插件和一个简单的钢琴键盘布局，当 onKeyPressed 时调用 Flutter 插件和 onKeyUp钢琴键。钢琴应用程序可以在模拟器中运行，并且可以产生声音。但是，有时，应用程序会崩溃并显示错误消息:

F/crash_dump32(22593): crash_dump.cpp:474] failed to attach to thread 185: Permission denied

在模拟器中，弹出警告显示 System UI isn't responding带选项: Close the app或 Wait .
如果我选择 Wait ，它将恢复工作，直到相同的线程错误再次出现。
在我的实现中，我有一个用 Kotlin 编写的类，它将在一个线程中运行:

class Synth : Runnable {
    private lateinit var mThread: Thread
    private var mRunning = false
    private var mFreq = 440.0
    private var mAmp = 0.0
    private var mNumKeysDown = 0


    fun start() {
        mThread = Thread(this)
        mRunning = true
        mThread.start()
    }

    fun stop() {
        mRunning = false
    }

    fun keyDown(key: Int): Int {
        mFreq = Math.pow(1.0594630f.toDouble(), key.toDouble() - 69.0) * 440.0
        mAmp = 1.0
        mNumKeysDown += 1
        return mNumKeysDown
    }
}

以下是 Synth类是从用 Kotlin 编写的插件调用的:

当插件从 Flutter 客户端启动时:

class PianoPlugin: FlutterPlugin, MethodCallHandler {

fun setup(plugin: PianoPlugin, binaryMessenger: BinaryMessenger) {
      plugin.channel = MethodChannel(channelName)
      plugin.channel.setMethodCallHandler(plugin)
      plugin.synth = Synth()
      plugin.synth.start()              // <- Start the thread
    }

  override fun onMethodCall(@NonNull call: MethodCall, @NonNull result: Result) {
    if (call.method == "getPlatformVersion") {
      result.success(android.os.Build.VERSION.RELEASE)
    } else if (call.method == "onKeyDown"){
      try {
        val arguments: ArrayList<Int> = call.arguments as ArrayList<Int>
        val numKeysDown: Int = synth.keyDown(arguments.get(0) as Int)    // <- Function call

        result.success(numKeysDown)
      } catch (ex: Exception) {
        result.error("100", ex.message, ex.getStackTrace())
      }
}

我想知道是否有人遇到过类似的线程问题，可以分享一些可能原因的见解。非常感激!

Answer 1

我通过冷启动模拟器解决了它。