kotlin 线程切换工具

这里先不说协程，前面讲过java线程池，kotlin扩展函数。

java 线程池Executors
kotlin 扩展方法

封装一下工具类

private val handler = Handler(Looper.getMainLooper())
private val coreSize = Runtime.getRuntime().availableProcessors() + 1

private val fix: ExecutorService = Executors.newFixedThreadPool(coreSize)
private val cache: ExecutorService = Executors.newCachedThreadPool()
private val single: ExecutorService = Executors.newSingleThreadExecutor()
private val scheduled: ExecutorService = Executors.newScheduledThreadPool(coreSize)

/**
 * 切换到主线程
 */
fun <T> T.ktxRunOnUi(block: T.() -> Unit) {
    handler.post {
        block()
    }
}

/**
 * 延迟delayMillis后切换到主线程
 */
fun <T> T.ktxRunOnUiDelay(delayMillis: Long, block: T.() -> Unit) {
    handler.postDelayed({
        block()
    }, delayMillis)
}

/**
 * 子线程执行。SingleThreadPool
 */
fun <T> T.ktxRunOnBgSingle(block: T.() -> Unit) {
    single.execute {
        block()
    }
}

/**
 * 子线程执行。FixedThreadPool
 */
fun <T> T.ktxRunOnBgFix(block: T.() -> Unit) {
    fix.execute {
        block()
    }
}

/**
 * 子线程执行。CachedThreadPool
 */
fun <T> T.ktxRunOnBgCache(block: T.() -> Unit) {
    cache.execute {
        block()
    }
}

如此一来，任意地方都可以切换线程。加上泛型T的好处是lambda内部this指向调用者。

btHome.setSingleClick {
            btHome.ktxRunOnUi {
                val text = this.text.toString()
            }
        }

this就是btHome这个view了。