华为 & pthread_create & OOM

描述

项目中图书馆功能需要下载大量资源到本地设备，以节省流量。
文件不大，但是数量巨多！
封装完下载类后，出现了一个机型适配的问题，没想到是华为！

下载到一定数量文件后，会莫名其妙的停止下载，再次点击下载还会闪退！

通过查日志发现 OOM ，百思不得解

java.lang.OutOfMemoryError: pthread_create (1040KB stack) failed: Out of memory

详细报错

2019-03-26 14:12:31.608 28699-30821/com.***.*** E/AndroidRuntime: FATAL EXCEPTION: Thread-362
    Process: com.***,***, PID: 28699
    java.lang.OutOfMemoryError: pthread_create (1040KB stack) failed: Out of memory
        at java.lang.Thread.nativeCreate(Native Method)
        at java.lang.Thread.start(Thread.java:753)
        at java.util.concurrent.ThreadPoolExecutor.addWorker(ThreadPoolExecutor.java:970)
        at java.util.concurrent.ThreadPoolExecutor.ensurePrestart(ThreadPoolExecutor.java:1611)
        at java.util.concurrent.ScheduledThreadPoolExecutor.delayedExecute(ScheduledThreadPoolExecutor.java:342)
        at java.util.concurrent.ScheduledThreadPoolExecutor.schedule(ScheduledThreadPoolExecutor.java:562)
        at java.util.concurrent.ScheduledThreadPoolExecutor.execute(ScheduledThreadPoolExecutor.java:654)
        at okhttp3.internal.http2.Http2Connection$ReaderRunnable.applyAndAckSettings(Http2Connection.java:738)
        at okhttp3.internal.http2.Http2Connection$ReaderRunnable.settings(Http2Connection.java:710)
        at okhttp3.internal.http2.Http2Reader.readSettings(Http2Reader.java:289)
        at okhttp3.internal.http2.Http2Reader.nextFrame(Http2Reader.java:141)
        at okhttp3.internal.http2.Http2Reader.readConnectionPreface(Http2Reader.java:80)
        at okhttp3.internal.http2.Http2Connection$ReaderRunnable.execute(Http2Connection.java:607)
        at okhttp3.internal.NamedRunnable.run(NamedRunnable.java:32)
        at java.lang.Thread.run(Thread.java:784)
2019-03-26 14:12:31.618 744-2650/? E/iMonitor: FaultDetect: DUMPTOOL_PRINTF return.
2019-03-26 14:12:31.619 744-2650/? E/iMonitor: FaultDetect: DUMPTOOL_PRINTF return.
2019-03-26 14:12:31.619 744-2650/? E/iMonitor: FaultDetect: DUMPTOOL_PRINTF return.
2019-03-26 14:12:31.619 744-2650/? E/iMonitor: FaultDetect: DUMPTOOL_PRINTF return.

解决

通过查询资料 《栈内存溢出: java.lang.OutOfMemoryError: pthread_create (1040KB stack) failed: Out of memory》，发现是华为手机限制了线程的最大创建数量，而我这边下载处理时，OkHttpClient() 的创建也没有采用单例。

解决方案
OkHttpClient() 的创建采用单例，即可解决。

        /**
         * 开始下载文件
         */
        fun load(params: Array) {
            if (!NetworkUtil.isNetConnect(activity)) {
                callback?.error(code = -2, msg = "网络错误，请重试~")
                return
            }
            /**
             * 改为 单例，否则个别华为手机 会 OOM
             */
//            val httpClient = OkHttpClient()
            call = httpClient.newCall(Request.Builder().url(params[0]).get().build())

注释掉每次下载都 OkHttpClient() 的代码，改为单例，就解决了。

    /**
     * 单例下载
     */
    companion object {
        val httpClient = OkHttpClient()
    }