android中c++层binder简单例子

原文：http://blog./uid-25677340-id-3072236.html

service

1. #include
2. #include
3. #include
4. #include
5. #include
7. using namespace android;
9. #ifdef LOG_TAG
10. #undef LOG_TAG
11. #endif
12. #define LOG_TAG "testService"
15. class MyService : public BBinder
16. {
17. public:
18. MyService()
19. {
20. mydescriptor = String16("media.hello");
21. n=0;
22. }
23. virtual ~MyService() {}
25. //This function is used when call Parcel::checkInterface(IBinder*)
26. virtual const String16& getInterfaceDescriptor() const
27. {
28. LOGE("this is enter ==========getInterfaceDescriptor");
29. return mydescriptor;
31. }
33. protected:
34. void show()
35. {
36. LOGE("this is for test show!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
37. LOGE("this is for test show!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
38. LOGE("this is for test show!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
39. LOGE("this is for test show!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
40. LOGE("this is for test show!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
41. }
42. virtual status_t onTransact( uint32_t code,
43. const Parcel& data,
44. Parcel* reply,
45. uint32_t flags = 0)
46. {
47. LOGD("enter MyService onTransact and the code is %d",code);
48. /*
49. if (data.checkInterface(this))
50. LOGD("checkInterface OK");
51. else
52. {
53. LOGW("checkInterface failed");
54. return BBinder::onTransact(code, data, reply, flags);
55. }
56. */
57. switch (code)
58. {
59. case 1:
60. LOGD("MyService interface 1");
61. break;
62. case 2:
63. LOGD("MyService interface 2");
64. cb = data.readStrongBinder();
65. break;
66. case 3:
67. {
68. LOGD("MyService interface 3, exit");
69. //No unregister service routine?
71. //It should return to client first and then call exit in another place.
72. exit(0);
73. break;
74. }
75. case 4:
76. {//call cb
77. LOGD("MyService interface 4 before if================");
78. cb = data.readStrongBinder();
79. if (cb != NULL)
80. {
81. LOGD("MyService interface 4");
82. Parcel in, out;
83. in.writeInterfaceToken(String16("ghq.callback"));
84. in.writeInt32(n++);
85. in.writeString16(String16("This is a string."));
86. cb->transact(1, in, &out, 0);
87. show();
88. }
89. break;
90. }
91. default:
92. return BBinder::onTransact(code, data, reply, flags);
93. }
94. return 0;
95. }
97. private:
98. String16 mydescriptor;
99. sp cb;
100. int n;
101. };
105. int main()
106. {
108. sp sm = defaultServiceManager();
110. status_t ret;
112. //register MyService to ServiceManager
113. MyService* srv = new MyService();
114. ret = sm->addService(String16("media.hello"), srv);
117. LOGD("addservice media.hello return %d", ret);
119. //call binder thread pool to start
120. ProcessState::self()->startThreadPool();
121. IPCThreadState::self()->joinThreadPool(true);
122. return 0;
123. }

client

1. #include
2. #include
3. #include
4. #include
5. #include
6. #include
8. using namespace android;
10. #ifdef LOG_TAG
11. #undef LOG_TAG
12. #endif
13. #define LOG_TAG "testCallback"
15. class MySetupCallback : public BBinder
16. {
17. public:
18. MySetupCallback()
19. {
20. mydescriptor = String16("android.os.ISetupCallback");
21. }
22. virtual ~MySetupCallback() {}
24. virtual const String16& getInterfaceDescriptor() const
25. {
26. return mydescriptor;
27. }
29. protected:
30. virtual status_t onTransact( uint32_t code,
31. const Parcel& data,
32. Parcel* reply,
33. uint32_t flags = 0)
34. {
35. LOGD("enter MySetupCallback onTransact, code=%u", code);
36. if (data.checkInterface(this))
37. LOGD("checkInterface OK");
38. else
39. {
40. LOGW("checkInterface failed");
41. return -1;
42. }
43. switch (code)
44. {
45. default:
46. break;
47. }
48. return 0;
49. }
51. private:
52. String16 mydescriptor;
53. };
55. int main()
56. {
57. sp sm = defaultServiceManager();
59. sp b = sm->getService(String16("media.hello")); //Context.MCU_SERVICE
61. if (b == NULL)
62. {
63. LOGW("Can't find binder service \"media.hello\"");
64. return -1;
65. }
67. Parcel in1,out1;
68. MySetupCallback *cb = new MySetupCallback();
69. in1.writeStrongBinder(sp(cb));
70. int ret = b->transact(4, in1, &out1, 0); //TRANSACTION_registerSetup = 4
71. LOGD("transact(4) return %d", ret);
73. ProcessState::self()->startThreadPool();
74. IPCThreadState::self()->joinThreadPool();
76. return 0;
77. }

Android.mk

1. # Copyright 2006 The Android Open Source Project
   
2. 
   
3. LOCAL_PATH:= $(call my-dir)
   
4. include $(CLEAR_VARS)
   
5. 
   
6. LOCAL_MODULE_TAGS := eng
   
7. 
   
8. LOCAL_SRC_FILES:= \
   
9.        testCallback.cpp
   
10. 
    
11. LOCAL_C_INCLUDES += \
    
12.         $(LOCAL_PATH) \
    
13.         $(LOCAL_PATH)/../include \
    
14.         $(LOCAL_PATH)/../include/callback \
    
15. 
    
16. 
    
17. LOCAL_SHARED_LIBRARIES := \
    
18.     libcutils \
    
19.     libbinder \
    
20.     libutils \
    
21.     libhardware
    
22. 
    
23. LOCAL_CFLAGS := -DRIL_SHLIB
    
24. 
    
25. LOCAL_MODULE:= testCallback
    
26. 
    
27. include $(BUILD_EXECUTABLE)
    
28. 
    
29. include $(CLEAR_VARS)
    
30. 
    
31. LOCAL_MODULE_TAGS := eng
    
32. 
    
33. LOCAL_SRC_FILES:= \
    
34.            testService.cpp
    
35. 
    
36. LOCAL_C_INCLUDES += \
    
37.         $(LOCAL_PATH) \
    
38.         $(LOCAL_PATH)/../include \
    
39.         $(LOCAL_PATH)/../include/callback \
    
40. 
    
41. 
    
42. LOCAL_SHARED_LIBRARIES := \
    
43.     libcutils \
    
44.     libbinder \
    
45.     libutils \
    
46.     libhardware
    
47. 
    
48. LOCAL_CFLAGS := -DRIL_SHLIB
    
49. 
    
50. LOCAL_MODULE:= testService
    
51. 
    
52. include $(BUILD_EXECUTABLE)