Kotlin 内置的好用扩展函数

前言

Kotlin 中有很多内置的扩展函数，非常好用，可以代替很多需要封装的Java工具类，本文主在列举一些发现的好用扩展函数；
本文也会不断维护，大佬们有新的扩展函数，或者自己写的感觉好用扩展函数也可以加进来；

日志打印

internal const val DEBUG = true
internal const val TAG = "shuxin.wei"

fun Any?.logI(tag: String = TAG, debug: Boolean = true) {
    if (DEBUG && debug) {
        Log.i(tag, this.toString())
    }
}

fun Any?.logD(tag: String = TAG, debug: Boolean = true) {
    if (DEBUG && debug) {
        Log.d(tag, this.toString())
    }
}

fun Any?.logE(tag: String = TAG, debug: Boolean = true) {
    if (DEBUG && debug) {
        Log.e(tag, this.toString())
    }
}

fun Any?.logW(tag: String = TAG, debug: Boolean = true) {
    if (DEBUG && debug) {
        Log.w(tag, this.toString())
    }
}

fun Any?.logP(tag: String = TAG, debug: Boolean = true) {
    if (DEBUG && debug) {
        println("$tag : $this")
    }
}

fun printThread(tag: String = TAG) {
    "$tag: ThreadName:${Thread.currentThread().name} ThreadId: ${Thread.currentThread().id}".logD(tag)
}

异步

1. 简介

可以在Activity、Fragment、Context上下文中方便线程切换，以及处理了可能发生的内存泄漏；
Boolean返回值表示是否执行了传入的函数；
将这段代码粘贴到AS中就可以看见入参和上下文；
文件地址：https://github.com/Kotlin/anko

class CoroutinesActivity : AppCompatActivity() {
    val doAsync: Future = "test".doAsync {
        val get: String? = this.weakRef.get()
        printThread(get ?: "test")
        "test"
    }
    val doAsyncResult: Future = "test".doAsyncResult {
        val get: String? = this.weakRef.get()
        printThread(get ?: "")
        return@doAsyncResult "test"
    }
    val activityUiThread: Boolean = AnkoAsyncContext(WeakReference(this@CoroutinesActivity)).activityUiThread {
    }
    baseContext.runOnUiThread {
    }
    val uiThread: Boolean = AnkoAsyncContext(WeakReference("test")).uiThread {
    }
    val activityUiThreadWithContext: Boolean = AnkoAsyncContext(WeakReference(this@CoroutinesActivity)).activityUiThreadWithContext {
    }
    val ankoContext = AnkoContext.create(this@CoroutinesActivity, this@CoroutinesActivity)
    val activityUiThread1: Boolean = AnkoAsyncContext(WeakReference(ankoContext)).activityUiThread {
    }
    val activityUiThreadWithContext1: Boolean = AnkoAsyncContext(WeakReference(ankoContext)).activityUiThreadWithContext {
    }
    Fragment().runOnUiThread {
    }
    val supportFragmentUiThread:Boolean = AnkoAsyncContext(WeakReference(Fragment())).supportFragmentUiThread {
    }
}