blueprint binder

There's a bunch of online Binder the principles of the article, are very long, I hope I can try to put this question briefly. 1) About Binder DriveBinderin theAndroidwas designed as a driver, installed in/dev/binder, which isAndroidand theLinuxone of the important differences:Androida new inter-process communication method is proposed (IPC). In addition, this app

Analysis of the Binder-based IPC process framework in Android, androidbinder Preface: Activity, Service, BroadcastReceiver, and Content Provider are four application components of Android. These components that constitute a complete application can be in the same process or not in the same process, when these components are not in the same Process and data interaction is required, an Inter-Process Communication mechanism (IPC) is required, the

Http://blog.sina.com.cn/s/blog_4af327e10101irie.htmlMaterials from: The unveiling of Kdbus and Kdbus Details. The content of many links in the latter article is also valuable.advantages and disadvantages of D-busLinux does not have a good IPC mechanism. Windows, MacOS, and Android have a "binder" subsystem. Linux has sockets, FIFO, shared memory and other mechanisms, which are not very good for the application layer. Kdbus attempts to create a mechani

Binder proxy technical solution Author's low-end coders Time: 0x0 Several friends tried to hook the ioctl of system_process to intercept the IPC communication of the system. The disadvantage of this solution is that it is too low-layer. After successful interception, it is quite troublesome to parse the communication data. in addition, there are also a bunch of compatibility issues. Due to different Android firmware versions, some parcelable structure

1. Mediapplayerservice start, how to register in ServiceManager, do not explain the detailed detailsServiceManager is the service manager of the entire system, and the rest of the system services are called ServiceManager through the Defaultservicemanager remote interface. After the service obtains the ServiceManager interface, it joins itself to the ServiceManager, then initiates itself and waits for the client to connect to the request.The knowledge about how Systemmanager starts and becomes a

AsInterface parsing in Binder, binderasinterface When AIDL is used for communication, an asInterface function is generated in Stub class. The example in Android development art exploration is analyzed. The source code of the asInterface function is: 1 /** 2 * Cast an IBinder object into an com.willhua.demoaidl.aidl.IBookManager 3 * interface, generating a proxy if needed. 4 */ 5 public static com.willhua.dem

1. Internal mechanism review Binder framework key pointsBinder Process Communication Process scenario examples:Test_server through AddService to Service_manager registration serviceTest_client access to Service_manager through GetServiceThen test_client use the service and Test_server communicationThe access to the driver involved in the above communication process:(1) Registration service process Add_serviceA, test_server constructs a flat_binder_obj

Read a lot of articles on the internet on binder, but I still want to record their own mental journey, some are following the footsteps of others to appreciate the steep scenery, some of their own alone into the code deep salvage of the harvest. I'm not sure I'm all over it, but I'm more worried about the way I'm going to be at a two-month time. The best way to verify and retain them is to write them down and read them back in a few months to see if t

model receives parameter issuesThe general answer is the solution I said above, which seems to be not what I want.Try to think for a moment.The standard HTTP request is received when, for MVC, he is just a form or a querystring (if you understand the error, please correct), then how does the MVC framework do to bind a form to a model?Why did the corresponding field in HttpContext.Request.Form complete the string concatenation?Why is the assignment of the form and the model different? Can I use

ServiceManager, in fact, is also a service, but its server-side implementation does not use the binder library structure implementation, but directly open Binder/dev for communication, not universal.The following is an example of Mediaplayservice in MediaServer, which illustrates the more common implementation of a service using binder communication mechanisms.Fi

Read a lot of articles on the internet on binder, but I still want to record their own mental journey, some are following the footsteps of others to appreciate the steep scenery, some of their own alone into the code deep salvage of the harvest. I'm not sure I'm all over it, but I'm more worried about the way I'm going to be at a two-month time. The best way to verify and retain them is to write them down and read them back in a few months to see if t

A lot of people say that the binder is a proxy model, more than the same, can understand the essence of less. This article analyzes Java Layer Binder design objectives from a design perspective, as well as design ideas, design flaws, and thus harness it.For "Bond son" understanding, from the communication point of view, is a way of communication, and socket is no different. Client transact, server-side ontr

The binder system can run in the android native environment, but cannot run in the Java Virtual Machine. Therefore, to use binder communication in the Java environment, you need to call some JNI native functions (/android_runtime/android_util_binder.cpp) Get iservicemanager The servicemanager. Java file manages all services at the Java layer. To call any function in servicemanager. Java, you must first obt

will always be aware of a problem, when we put all these operations into the service for implementation, what should we do with the update of the control in the activity? For example, because there will always be a progress bar during playback, And the download of files should always update the downloads, I don't know how you can solve this problem. I checked it online and found that all the methods are broadcast, that isRegister a broadcast in the activity, and then transmit data between the s

Android-binder (a) Learn fromExplore the art of Android developmentHttps://www.jianshu.com/p/bdef9e3178c972765136Discussion on binderBinder is an implementation class for the IBinder interface, and Inder is a bridge between the various managers and their service providers that connect the system, and binders are used primarily in service.Layering of Android SystemsAfter we understand the layering of Android, we have a clearer understanding of the IPC,

General statement:Binder is an IPC mechanism provided by Android system, the Android system can basically be regarded as binder-based C/s architecture, Binder is also a C/s form, it belongs to drive but drive a piece of memory rather than equipment, framework such as :1. Service-side interfaceA biinder server is actually a binder class object that, once created,

The communication mechanism of the Binder is simple, but some problems have been encountered in the use process. Finally, we have solved the problem. Here we will summarize the problems and share them with you:1. To use Binder for communication, first define the interface, and then implement the BnInterface *** on the server and the client BpInterface ***. In the end, one is to unpackage the parameters, and

Application scenarios that inherit the binder class to bind a service: the service is for your own use only (not third-partyProgramDevelopment ). Note: This method is only applicable when the client and service are in the same program and process. Implementation Method: 1. Create a binder instance in service: This instance contains public methods that can be called by the client; This instance returns

1. Binder (IPC) Linux processes must communicate with each other to share resources and information. Therefore, the operating system kernel must provideInter-process communicationMechanism (IPC, inter-process communication ). IPC Mechanism types: Named Pipe (name pipe), Message Queue (Message Queue), signal (signal), and Memory Sharing (share memory ); The communication between applications on Android terminals is almost invisible to these IPC communi

Service Manager is the manager of all services. Therefore, all servers (system servers) must register with it, and applications query corresponding services from service manager. Its implementation is located in the "frameworks/base/cmds/servicemanager \ service_manager.c" file. int main(int argc, char **argv){ struct binder_state *bs; void *svcmgr = BINDER_SERVICE_MANAGER; bs = binder_open(128*1024); if (binder_become_context_manager(bs)) { LOGE("cannot become context manage