From 10429c85af1b8a100c7b8af3eb1dd9ab2f5b28b4 Mon Sep 17 00:00:00 2001
From: Omooo <869759698@qq.com>
Date: Mon, 30 Mar 2020 21:03:35 +0800
Subject: [PATCH] =?UTF-8?q?Create=20Looper=20=E7=9A=84=E5=89=AF=E4=B8=9A.m?=
 =?UTF-8?q?d?=
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 .../Interview/技巧心得相关/Looper 的副业.md   | 26 +++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 blogs/Android/Framework/Interview/技巧心得相关/Looper 的副业.md

diff --git a/blogs/Android/Framework/Interview/技巧心得相关/Looper 的副业.md b/blogs/Android/Framework/Interview/技巧心得相关/Looper 的副业.md
new file mode 100644
index 0000000..fc5fbdd
--- /dev/null
+++ b/blogs/Android/Framework/Interview/技巧心得相关/Looper 的副业.md	
@@ -0,0 +1,26 @@
+---
+Looper 的副业
+---
+
+```c++
+int addFd(int fd, int ident, int events, sp<LooperCallback>& callback, ...){
+	epoll_ctl(mEpollFd, EPOLL_CTL_ADD, fd, &eventItem);
+}
+void NativeMessageQueue::setFileDescriptorEvents(int fd, int events){
+    mLooper->addFd(fd, Looper::POLL_CALLBACK, looperEvents, this, reinterpret_cast<void*>(events));
+}
+void addOnFileDescriptorEventListener(FileDescriptor fd, int events, OnFileDescriptorEventListener listener){...}
+```
+
+Framework 里面有哪些地方用到了副业？
+
+```c++
+status_t NativeDisplayEventReceiver::initialize(){
+	mMessageQueue->getLooper()->addFd(mReceiver.getFd(), 0, EVENT_INPUT, this, NULL);
+}
+```
+
+#### 总结
+
+1. Looper 里可以监听其他描述符
+2. 创建管道，跨进程传数据，用 Looper 监听描述符事件
\ No newline at end of file