messenger binder

First, prefaceIn the previous blog Android IPC mechanism (ii): Aidl's basic usage, the author describes a major way of communication between Android processes. Use Aidl for communication. The basic usage of aidl is also introduced.In fact, the Aidl method uses binders for cross-process communication. Binder is a way of communicating across processes in Android. The underlying implementation principle is more complex. Limited to the author level, can n

If you need your service to communicate with remote processes, you can use a Messenger to provide interfaces for your service. This technology can be used to implement inter-process communication (IPC) without using AIDL ). The following is an overview of how to use Messenger: Service implements a Handler that receives the callback caused by each call from the client. Handler is used to create a

Android Process Communication Using Messenger and androidmessenger Messenger can be used for inter-process communication, while Messenger queues Service requests, so it does not support multi-thread communication. Take a look at the official documentation's explanation of Messenger: Reference to a Handler, which othe

Some time ago have been looking at the knowledge of binder, recently just have time, summed up some knowledge, hope and everyone exchange study.Speaking of Binder I believe that you learn more and more about the development of Android, the binder mechanism as a mechanism of communication between Android, the application of the Android bottom is very much. We all

Binder works on the Linux layer, is a driver that does not require hardware, from a threading perspective, the binder code runs in the kernel state, the client program uses binder is done through the system call.Binder is a monolithic architecture that includes server-side interfaces, binder drivers, and client interfa

6 Binder memory ing and receiving cache zone management For the time being, let's take a look at how data arrives at the receiving end from the sending end in the traditional IPC method? Generally, the sender stores the prepared data in the cache and calls the API to enter the kernel through system calls. The kernel service program allocates memory in the kernel space and copies data from the sender's cache to the kernel cache. When the receiver reads

Binder: Pins, paper clips. In life, we use a paper clip to "do not" with two sheets. In Android, Binder is used for interprocess communication, and two processes are "not" together.Binder is an architecture with 3 modules (server-side interface, Binder driver, customer-service interface), such as:The binder server, in

Either the client or the server, the head must first be calledSP What did Defaultservicemanager () do, and what instance did it return?The function is defined in the frameworks/native/libs/binder/iservicemanager.cpp:33SpKey steps can be broken down into several steps: 1, Processstate::self (), 2, Processstate::getcontextobject (...), 3, interface_cast1 processstate::self ()Frameworks/native/libs/binder/proc

Thinking analysis, is the following process:How did the ServiceManager start?According to our previous blog ideas, we have a servicemanager agent on the systemserver side, Then the Android system should provide inheritance like AMS or indirectly inherit from Java layer Binder and then rewrite the Ontransact method to handle the request. However, ServiceManager does not use a complex binder class structure

Although Android is built on Linux, it implements a lightweight IPC Mechanism instead of using Linux to provide the IPC Mechanism.-- Binder Mechanism. And androidBased on the Binder Mechanism, the android framework provides a set of encapsulation that can implement object proxy (proxy for objects in Remote Processes in local processes ). This article briefly analyzes androidBinder Mechanism.Binder Scenario

Messenger, Messenger, can use it for interprocess communication, and Messenger requests the Service in a queue, so it does not support multithreaded communication. Check out the official documentation for Messenger 's explanation:Reference to a Handler, which others can with send messages to it. This allows for the im

In Asp.net MVC, Model Binder is a very important part in the lifecycle. The process of Model Binder can help you understand what happened behind Model Binder. In addition, this series of articles lists the extension points of Model Binder in MVC and how to use these extensions. Reading Directory: 1. workflow 2 of Model

First, create a custom model binder:The process of modeling a model object with request data and passing an object to an action parameter is called model binding.Most of the time the action parameter is the primary key or other unique identifier of the object, so we do not have to place a duplicate data access code in all the actions (the "\\Before" section of the code below), but instead use a custom model binder (the "\\After" section of the code be

First, create a custom model binder:The process of modeling a model object with request data and passing an object to an action parameter is called model binding.Most of the time the action parameter is the primary key or other unique identifier of the object, so we do not have to place a duplicate data access code in all the actions (the "\\Before" section of the code below), but instead use a custom model binder (the "\\After" section of the code be

Android binder Mechanism 2 (client and common server), androidbinder Before talking about the communication between them, let's take MediaServer as an example to see what common Server processes are doing. Int main (){...... // Obtain the ProcessState instance sp Defaservicservicemanager () has been introduced in the previous article.MediaPlayerService: instantiate () is implemented as follows, that is, addService to ServiceManager, which is simila

Scene:1) IMediaPlayer.cppBp, BnSpInterface_castReply->writeint32 (Setvideosurfacetexture (bufferproducer));Use in Mediaplayerservicesp2) Pass the BP object in the Mediaplayerservice process to another process using theVirtual status_t Connect (const sp{Parcel data, reply;Data.writeinterfacetoken (Iremotedisplay::getinterfacedescriptor ());Data.writestrongbinder (Iinterface::asbinder (bufferproduce));Data.writestrongbinder (Iinterface::asbinder (sinkclient));Remote ()->transact (CONNECT, data, re