Android 从上到下写一个例子 本地服务(二)

世当戮灭

本文继上一篇文章持续写代码https://blog.csdn.net/we1less/article/details/118825911
此时需求一个当地效劳起首将jni文件写好
途径frameworks/base/services/core/jni/com_android_server_GodvService.cpp

1. #define LOG_TAG "godv"
3. #include "jni.h"
4. #include <nativehelper/JNIHelp.h>
5. #include "android_runtime/AndroidRuntime.h"
7. #include <utils/misc.h>
8. #include <utils/Log.h>
9. #include <hardware/vibrator.h>
11. #include <inttypes.h>
12. #include <stdio.h>
14. namespace android
15. {
17. //出用到的形参能够省略
18. static jint godv_open(JNIEnv*, jobject) {
19.     ALOGE("godv_open");
20.     return 0;
21. }
23. static jint godv_ioctl(JNIEnv*, jobject, jint which, jint status) {
24.     ALOGE("godv_ioctl which == %d , status == %d ", which, status);
25.     return 0;
26. }
28. static const JNINativeMethod method_table[] = {
29.     { "godv_open", "()I", (void*)godv_open },
30.     { "godv_ioctl", "(II)I", (void*)godv_ioctl }
31. };
33. int register_android_server_GodvService(JNIEnv *env)
34. {
35.     return jniRegisterNativeMethods(env, "com/android/server/GodvService",
36.             method_table, NELEM(method_table));
37. }
39. };

复造代码

---

接下去正在frameworks/base/services/core/jni/onload.cpp文件中将当地效劳注册

1. extern "C" jint JNI_OnLoad(JavaVM* vm, void* /* reserved */)
2. {
3.     JNIEnv* env = NULL;
4.     jint result = -1;
6.     if (vm->GetEnv((void**) &env, JNI_VERSION_1_4) != JNI_OK) {
7.         ALOGE("GetEnv failed!");
8.         return result;
9.     }
10.     ALOG_ASSERT(env, "Could not retrieve the env!");
12.     ...
13.     register_android_server_GodvService(env);
14.     register_android_hardware_display_DisplayViewport(env);
16.     return JNI_VERSION_1_4;
17. }

复造代码

---

修正mk文件

1. LOCAL_SRC_FILES += \
2.     ...
3.     $(LOCAL_REL_DIR)/com_android_server_GodvService.cpp \
4.     $(LOCAL_REL_DIR)/onload.cpp

复造代码

---

编译 make -j16 ANDROID_COMPILE_WITH_JACK=false
编译胜利后运转app获得log证实当地效劳曾经胜利

1. 09-06 23:33:35.163  3033  3176 D godv    : GodvService::gov_ioctl
2. 09-06 23:33:35.163  3033  3176 E godv    : godv_ioctl which == 0 , status == 1

复造代码

免责声明：假如进犯了您的权益，请联络站少，我们会实时删除侵权内乱容，感谢协作！