How to Implement the binder client program

 

References:

Http://blog.csdn.net/baiyanning/article/details/6191682

The previous chapter describes how to binder the server.

The next step is how to implement the client program. The client executable program we will introduce is example

Step 2:

Create an exampleclient directory under the framework/base directory to save the client source code:

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1. $ CD framework/base/
2. $ Mkdir exampleclient
3. $ CD exampleclient/

$ CD framework/base/<br/> $ mkdir exampleclient <br/> $ CD exampleclient/

Step 2:

The exampleclient directory contains three source files: example. H, example. cpp, and Android. mk.

The content of example. H is as follows:

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1. // File: example. h
2. # Ifndef android_byn_example_h
   
3. # Define android_byn_example_h
   
5. Namespace android
6. {
7. Class Example {
8. Public:
9. Void add100 (int n );
10. PRIVATE:
11. Static const void getexampleservice ();
12. };
13. }; // Namespace
14. # Endif // android_byn_example_h

// File: Example. h <br/> # ifndef android_byn_example_h <br/> # define android_byn_example_h </P> <p> namespace Android <br/>{< br/> class example {<br/> public: <br/> void add100 (int n); <br/> PRIVATE: <br/> static const void getexampleservice (); <br/>}; <br/> }; // namespace <br/> # endif // android_byn_example_h <br/>The content of example. cpp is as follows:

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1. // File: example. cpp
2. # Include <binder/iservicemanager. h>
   
3. # Include <binder/ipcthreadstate. h>
   
4. # Include "example. H"
6. Namespace android
7. {
8. Sp <ibinder> binder;
9. Void example: add100 (int n)
10. {
11. Getexampleservice ();
12. Parcel data, reply;
13. Int answer;
15. Data. writeint32 (getpid ());
16. Data. writeint32 (N );
17. LogE ("bpexampleservice: Create remote ()-> transact ()/n ");
18. Binder-> transact (0, Data, & reply );
19. Answer = reply. readint32 ();
20. Printf ("answner = % d/N", answer );
21. Return;
22. }
24. Const void example: getexampleservice ()
25. {
26. Sp <iservicemanager> Sm = defaultservicemanager ();
27. Binder = Sm-> getservice (string16 ("Byn. Example "));
28. LogE ("Example: getexampleservice % P/N", Sm. Get ());
29. If (Binder = 0 ){
30. Logw ("exampleservice not published, waiting ...");
31. Return;
32. }
33. }
34. }; // Namespace
36. Using namespace android;
38. Int main (INT argc, char ** argv)
39. {
40. Example * P = new example ();
41. P-> add100 (1 );
42. Return 0;
43. }

// File: Example. CPP <br/> # include <binder/iservicemanager. h> <br/> # include <binder/ipcthreadstate. h> <br/> # include "example. H "</P> <p> namespace Android <br/> {<br/> sp <ibinder> binder; <br/> void example: add100 (int n) <br/>{< br/> getexampleservice (); <br/> parcel data, reply; <br/> int answer; </P> <p> data. writeint32 (getpid (); <br/> data. writeint32 (n); <br/> LogE ("bpexampleservice: Create remote ()-> transact ()/n"); <br/> binder-> transact (0, data, & reply); <br/> answer = reply. readint32 (); <br/> printf ("answner = % d/N", answer); <br/> return; <br/>}</P> <p> const void example: getexampleservice () <br/>{< br/> sp <iservicemanager> Sm = defaservicservicemanager (); <br/> binder = Sm-> getservice (string16 ("Byn. example "); <br/> LogE (" Example: getexampleservice % P/N ", SM. get (); <br/> If (Binder = 0) {<br/> logw ("exampleservice not published, waiting... "); <br/> return; <br/>}< br/>}; // namespace </P> <p> using namespace android; </P> <p> int main (INT argc, char ** argv) <br/> {<br/> example * P = new example (); <br/> P-> add100 (1); <br/> return 0; <br/>}< br/>The content of the android. mk file is as follows:

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1. # File: Example
2. Local_path: = $ (call my-DIR)
3. Include $ (clear_vars)
4. Local_src_files: = \
5. Example. cpp
6. Local_c_includes: = $ (jni_h_include)
7. Local_shared_libraries: = \
8. Libutils libbinder libexample
9. Local_module_tags: = optional
10. Local_prelink_module: = false
11. Local_module: = example
13. Include $ (build_executable)

# File: Example <br/> local_path: = $ (call my-DIR) <br/> include $ (clear_vars) <br/> local_src_files: ==< br/> example. CPP <br/> local_c_includes :=$ (jni_h_include) <br/> local_shared_libraries :=\< br/> libutils libbinder libexample <br/> local_module_tags: = optional <br/> local_prelink_module: = false <br/> local_module: = example </P> <p> include $ (build_executable) <br/>

Step 2:

Compile the example executable program:

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1. $ Cd ~ /Working_directory/
2. $ Mmm framework/base/exampleclient

$ Cd ~ /Working_directory/<br/> $ Mmm framework/base/exampleclientFor example:

After compilation, you can see the executable program example in the out/target/product/generic/system/bin/directory.

In this way, the client program is generated, and the next step is to verify our program.

Step 2:

Make in the root directory of the android source code to generate the system. imgfile

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1. $ Make Snod

$ Make Snod

Step 2:

Start the simulator and use ADB to connect

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1. $ Emulator &

$ Emulator & <br/>Connect with ADB

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1. $ ADB Shell

$ ADB Shell

Step 2

In the simulator, view the libexample. So, exampleserver, and example files.

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1. # Ls system/lib/libex *
2. # Ls system/bin/examp

# Ls system/lib/libex * <br/> # ls system/bin/exampAs shown in:

Step 2: Start exampleserver

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1. #./System/bin/exampleserver &

#./System/bin/exampleserver & <br/>

Step 2: Start the client program example

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1. #./System/bin/Example

#./System/bin/example <br/>As shown in: