android Handler内存泄露 kotlin内存泄露处理
16lz
2021-01-23
这几天使用kotlin写一个项目，用到handler，然后提醒提警告
This Handler class should be static or leaks might occur......I wrote that debugging code because of a couple of memory leaks I found in the Android codebase. Like you said, a Message has a reference to the Handler which, when it's inner and non-static, has a reference to the outer this (an Activity for instance.) If the Message lives in the queue for a long time, which happens fairly easily when posting a delayed message for instance, you keep a reference to the Activity and "leak" all the views and resources. It gets even worse when you obtain a Message and don't post it right away but keep it somewhere (for instance in a static structure) for later use. 百度后才发现是handler内存泄露的问题（原谅小木子是菜鸟）
参考：http://www.jcodecraeer.com/a/anzhuokaifa/androidkaifa/2014/1106/1922.html
http://blog.csdn.net/donkor_/article/details/78796518?utm_source=tuicool&utm_medium=referral
原代码
private var mHandler1: Handler = object : Handler() { override fun handleMessage(msg: Message?) { super.handleMessage(msg) if (msg != null) { when (msg.what) { CKey.WHAT_TWO -> { verify_tv_again.text = "获取验证码" verify_tv_time.text = "" verify_next.isEnabled = true verify_tv_again.isEnabled = true goToAccountInfoActivity() } } } } }然后按照网站的提示，做了修改：
private class MyHandler(activity: VerifyActivityActivity) : Handler() { private val mActivity: WeakReference = WeakReference(activity) override fun handleMessage(msg: Message) { if (mActivity.get() == null) { return } val activity = mActivity.get() when (msg.what) { 102 -> { activity!!.verify_tv_again.text = "李振华" activity.verify_tv_time.text = "" activity.verify_next.isEnabled = true activity.verify_tv_again.isEnabled = true// activity.goToAccountInfoActivity() } else -> { } } } } 
初始化参数的时候声明一个即可使用（黄色背景即有警告 ，修改后没有了黄色警告）
var handler12 = MyHandler(this) handler12.sendEmptyMessage(102)效果
大致讲解：
首先是拿到activity的弱引用 private val mActivity: WeakReference = WeakReference(activity)
然后在需要修改的view之间使用这个引用查找响应的控件做UI修改即可
activity!!.verify_tv_again.text = “李振华”
activity.verify_tv_time.text = “”
activity.verify_next.isEnabled = true
activity.verify_tv_again.isEnabled = true
！！是kotlin非空的意思然后就解除警告，详细讲解参考里面有，就不复制粘贴了，只贴了代码和效果图
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