【Android,Kotlin】教你写一个弱引用的Handler工具,避免内存泄漏

Crazy Coding

UtilKHandler

open class UtilKHandler<T>(cls: T) : Handler(Looper.getMainLooper()) {
    var ref: WeakReference<T>? = null

    init {
        ref = WeakReference(cls)
    }

    /**
     * 获取UIHandler
     * @return T?
     */
    fun getRef(): T? {
        return ref?.get()
    }
}

How To Use

UtilKHandler(this@RefreshKLayoutActivity).postDelayed(1000) { vb.refreshkContainer.refreshFinished() }

还可以写一个扩展函数,搭配使用

/**
 * postDelay
 * @receiver Handler
 * @param delayMills Long
 * @param runnable Runnable
 */
fun Handler.postDelayed(delayMills: Long, runnable: Runnable) {
    this.postDelayed(runnable, delayMills)
}

/**
 * 插到队首
 * @receiver Handler
 * @param runnable Runnable
 */
fun Handler.sendAtFrontOfQueue(runnable: Runnable) {
    val msg = Message.obtain(this, runnable)
    this.sendMessageAtFrontOfQueue(msg)
}

/**
 * 移除
 * @receiver Handler
 * @param runnable Runnable
 */
fun Handler.remove(runnable: Runnable) {
    this.removeCallbacks(runnable)
}