Android Kotlin Exception处理

@Throws(IOException::class)
fun createDirectory(file: File) {
    if (file.exists())
        throw IOException("Directory already exists")
    file.createNewFile()
}

/**
 * @author : zhaoyanjun
 * @time : 2021/7/5
 * @desc : 自定义异常
 */
class CommonException(code: Int, message: String) : Exception(message)

@Throws(CommonException::class)
fun createDirectory(file: File) {
    if (file.exists())
        throw CommonException(0, "file is exists")
    file.createNewFile()
}

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        kotlin.runCatching {
            sum(2, 4)
        }.onSuccess {
            Log.d("yy--", "结果正常$it")
        }.onFailure {
            it.printStackTrace()
            Log.d("yy--", "结果异常${it.message}")
        }

    }

    fun sum(num1: Int, num2: Int): Int {
        1 / 0
        return num1 + num2
    }
}

val result = kotlin.runCatching {
            sum(2, 4)
        }.onSuccess {
            Log.d("yy--", "结果正常$it")
        }.onFailure {
            it.printStackTrace()
            Log.d("yy--", "结果异常${it.message}")
        }.getOrDefault(100)

//如果运行正常，就返回6，运行异常就返回100
Log.d("yy--", "结果$result")

val result = kotlin.runCatching {
            sum(2, 4)
        }.onSuccess {
            Log.d("yy--", "结果正常$it")
        }.onFailure {
            it.printStackTrace()
            Log.d("yy--", "结果异常${it.message}")
        }.isFailure

    public fun exceptionOrNull(): Throwable? =
        when (value) {
            is Failure -> value.exception
            else -> null
        }

    @InlineOnly
    public inline fun getOrNull(): T? =
        when {
            isFailure -> null
            else -> value as T
        }