namespace Android2.{
/*在硬件抽象层中定义的硬件访问结构体，参考*/
struct hello_device_t* hello_device = NULL;
/*通过硬件抽象层定义的硬件访问接口设置硬件寄存器val 的值*/
static void hello_setVal(JNIEnv* env, jobject clazz, jint value) {
int val = value;
LOGI("Hello JNI: set value %d to device.", val);
if(!hello_device) {
LOGI("Hello JNI: device is not open.");
return;
}
hello_device->set_val(hello_device, val);
}
/*通过硬件抽象层定义的硬件访问接口读取硬件寄存器val 的值*/
static jint hello_getVal(JNIEnv* env, jobject clazz) {
int val = 0;
if(!hello_device) {
LOGI("Hello JNI: device is not open.");
return val;
}
hello_device->get_val(hello_device, &val);
LOGI("Hello JNI: get value %d from device.", val);
return val;
}
/*通过硬件抽象层定义的硬件模块打开接口打开硬件设备*/
static inline int hello_device_open(const hw_module_t* module, struct hello_device_t** device) {
return module->methods->open(module, HELLO_HARDWARE_MODULE_ID, (struct hw_device_t**)device);
}
/*通过硬件模块ID 来加载指定的硬件抽象层模块并打开硬件*/
static jboolean hello_init(JNIEnv* env, jclass clazz) {
hello_module_t* module;
LOGI("Hello JNI: initializing......");
if(hw_get_module(HELLO_HARDWARE_MODULE_ID, (const struct hw_module_t**)&module) == 0) {
LOGI("Hello JNI: hello Stub found.");
if(hello_device_open(&(module->common), &hello_device) == 0) {
LOGI("Hello JNI: hello device is open.");
return 0;
}
LOGE("Hello JNI: failed to open hello device.");
return -1;
}
LOGE("Hello JNI: failed to get hello stub module.");
return -1;
}
/*JNI 方法表*/
static const JNINativeMethod method_table[] = {
{"init_native", "()Z", (void*)hello_init},
{"setVal_native", "(I)V", (void*)hello_setVal},
{"getVal_native", "()I", (void*)hello_getVal},
};
/*注册JNI 方法*/
int register_Android_server_HelloService(JNIEnv *env) {
return jniRegisterNativeMethods(env, "com/Android/server/HelloService", method_table,NELEM(method_table));
}
};
修改onload.cpp
修改Android.mk
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