Android机制分析的相关内容

文章 2022-06-13 来自：开发者社区

Android嵌套滑动机制分析

本文大纲1. 嵌套ScrollView同向滑动2. 传统事件分发和嵌套滑动事件分发3. NestedScrollingChild和NestedScrollingParent4. NestedScrollingChildHelper和NestedScrollingParentHelper5. 结合案例讲解嵌套滑动事件分发顺序1. 嵌套ScrollView同向滑动所谓嵌套ScrollView同向滑动....

文章 2022-06-13 来自：开发者社区

Android嵌套滑动机制分析

温馨提示:Android事件分发机制是Android嵌套滑动机制的基石，阅读本文前请务必保证熟练掌握Android事件分发机制。传送门->事件分发四步曲之一《深度遍历讲解Android事件分发机制》本文大纲1. 嵌套ScrollView同向滑动2. 传统事件分发和嵌套滑动事件分发3. NestedScrollingChild&NestedScrollingParent4. 结合案例....

文章 2022-02-17 来自：开发者社区

Android中级第十一讲之MotionEvent的分发、拦截机制分析

最件看到事件分发机制，一方面在看内核剖析，一方面找测试小例子，最终找到，内容如下，——下载地址咱们就借这个小例子来讲一些问题一开始只关注了onTouch事件，应用于Window层，用来判断一些操作；后来研究到手势解锁，也只是onTouch的Down、Move、Up事件，根据移动的坐标确定点中的圆点；最后应用到PullToRefresh里Scrollview嵌套PageView，PagerVi....

文章 2022-02-16 来自：开发者社区

Android AdapterView 源码分析以及其相关回收机制的分析

前言忽然，发现，网上的公开资料都是教你怎么继承一个baseadapter，然后重写那几个方法，再调用相关view的 setAdpater()方法，接着，你的item 就显示在手机屏幕上了。很少有人关注android adpater模式机制的实现原理，比较深入的也不过是说说adapter getview()中的回收情况。今天把相关的源码看了一遍，把自己的理解记录下来。 AdpaterView ....

文章 2022-02-16 来自：开发者社区

Android系统进程间通信（IPC）机制Binder中的Server启动过程源代码分析(4)

这个函数的实现很简单，就是把MediaPlayerService这个Binder实体的引用写到一个struct svcinfo结构体中，主要是它的名称和句柄值，然后插入到链接svclist的头部去。这样，Client来向Service Manager查询服务接口时，只要给定服务名称，Service Manger就可以返回相应的句柄值了。 &nb...

文章 2022-02-16 来自：开发者社区

Android系统进程间通信（IPC）机制Binder中的Server启动过程源代码分析(3)

Service Manager被唤醒之后，就进入while循环开始处理事务了。这里wait_for_proc_work等于1，并且proc->todo不为空，所以从proc->todo列表中得到第一个工作项： w = list_first_entry(&proc->todo, struct binder_w...

文章 2022-02-16 来自：开发者社区

Android系统进程间通信（IPC）机制Binder中的Server启动过程源代码分析(2)

这个函数虽然很长，但是主要调用了talkWithDriver函数来与Binder驱动程序进行交互： status_t IPCThreadState::talkWithDriver(bool doReceive) { LOG_ASSERT(mProcess->mDriverFD&nbs...

文章 2022-02-16 来自：开发者社区

Android系统进程间通信（IPC）机制Binder中的Client获得Server远程接口过程源代码分析(2)

注意，这里的参数reply = 0，表示这是一个BC_TRANSACTION命令。前面我们提到，传给驱动程序的handle值为0，即这里的tr->target.handle = 0，表示请求的目标Binder对象是Service Manager，因此有： target_node =...

文章 2022-02-16 来自：开发者社区

Android系统进程间通信（IPC）机制Binder中的Server启动过程源代码分析(1)

在前面一篇文章浅谈Android系统进程间通信（IPC）机制Binder中的Server和Client获得Service Manager接口之路中，介绍了在Android系统中Binder进程间通信机制中的Server角色是如何获得Service Manager远程接口的，即defaultServiceManager函数的实现。Server获得了Service Manager远程接口之...

文章 2022-02-16 来自：开发者社区

Android系统进程间通信（IPC）机制Binder中的Client获得Server远程接口过程源代码分析(3)

注意，这里的status参数为0。从这里可以看出，binder_send_reply告诉Binder驱动程序执行BC_FREE_BUFFER和BC_REPLY命令，前者释放之前在binder_transaction分配的空间，地址为buffer_to_free，buffer_to_free这个地址是Binder驱动程序把自己在内核空间用的地址转换成用户空间地址再传给Service M...

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