/*******************************************************************************
* I.MX6 Android frameworks services 文件架构
* 说明：
* 这部分内容后续可能需要多给一点注意力了，因为这部分在做系统移植的时候经常
* 需要通过这部分来进行调试。
* 2016-3-19 深圳 南山平山村 曾剑锋
******************************************************************************/ 一、cat frameworks/base/services/jni/Android.mk
# 获取当前路径
LOCAL_PATH:= $(call my-dir)
# 清理变量，但是不会清理LOCAL_PATH变量的值
include $(CLEAR_VARS) # 指定jni cpp文件
LOCAL_SRC_FILES:= \
com_android_server_AlarmManagerService.cpp \
com_android_server_BatteryService.cpp \
com_android_server_input_InputApplicationHandle.cpp \
com_android_server_input_InputManagerService.cpp \
com_android_server_input_InputWindowHandle.cpp \
com_android_server_LightsService.cpp \
com_android_server_power_PowerManagerService.cpp \
com_android_server_SerialService.cpp \
com_android_server_SystemServer.cpp \
com_android_server_UsbDeviceManager.cpp \
com_android_server_UsbHostManager.cpp \
com_android_server_VibratorService.cpp \
com_android_server_location_GpsLocationProvider.cpp \
com_android_server_connectivity_Vpn.cpp \
onload.cpp -----------------------------+
|
# 指定jni cpp依赖的头文件 |
LOCAL_C_INCLUDES += \ |
$(JNI_H_INCLUDE) \ |
frameworks/base/services \ |
frameworks/base/core/jni \ |
external/skia/include/core \ |
libcore/include \ |
libcore/include/libsuspend \ |
$(call include-path-for, libhardware)/hardware \ |
$(call include-path-for, libhardware_legacy)/hardware_legacy \ |
|
# 指定依赖的库文件 |
LOCAL_SHARED_LIBRARIES := \ |
libandroid_runtime \ |
libandroidfw \ |
libcutils \ |
libhardware \ |
libhardware_legacy \ |
libnativehelper \ |
libsystem_server \ |
libutils \ |
libui \ |
libinput \ |
libskia \ |
libgui \ |
libusbhost \ |
libsuspend |
|
ifeq ($(WITH_MALLOC_LEAK_CHECK),true) |
LOCAL_CFLAGS += -DMALLOC_LEAK_CHECK |
endif |
|
# 生成的模块的名字 |
LOCAL_MODULE:= libandroid_servers |
|
# 这里相当于开始编译 |
include $(BUILD_SHARED_LIBRARY) |
|
二、cat frameworks/base/services/jni/onload.cpp <--------------+
/*
* Copyright (C) 2009 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/ #include "JNIHelp.h"
#include "jni.h"
#include "utils/Log.h"
#include "utils/misc.h" // 声明接下来的需要用到android命名空间中的jni函数
namespace android {
int register_android_server_AlarmManagerService(JNIEnv* env);
int register_android_server_BatteryService(JNIEnv* env);
int register_android_server_InputApplicationHandle(JNIEnv* env);
int register_android_server_InputWindowHandle(JNIEnv* env);
int register_android_server_InputManager(JNIEnv* env);
int register_android_server_LightsService(JNIEnv* env);
int register_android_server_PowerManagerService(JNIEnv* env);
int register_android_server_SerialService(JNIEnv* env);
int register_android_server_UsbDeviceManager(JNIEnv* env);
int register_android_server_UsbHostManager(JNIEnv* env);
int register_android_server_VibratorService(JNIEnv* env);
int register_android_server_SystemServer(JNIEnv* env);
int register_android_server_location_GpsLocationProvider(JNIEnv* env);
int register_android_server_connectivity_Vpn(JNIEnv* env);
}; // 使用命名空间
using namespace android; // C语言JNI加载函数，用于调用前面的android命名空间总的函数，这些函数
// 主要是对JNI进行注册。
extern "C" jint JNI_OnLoad(JavaVM* vm, void* reserved)
{
JNIEnv* env = NULL;
jint result = -; if (vm->GetEnv((void**) &env, JNI_VERSION_1_4) != JNI_OK) {
ALOGE("GetEnv failed!");
return result;
}
ALOG_ASSERT(env, "Could not retrieve the env!"); register_android_server_PowerManagerService(env); ---------------+
register_android_server_SerialService(env); |
register_android_server_InputApplicationHandle(env); |
register_android_server_InputWindowHandle(env); |
register_android_server_InputManager(env); |
register_android_server_LightsService(env); |
register_android_server_AlarmManagerService(env); |
register_android_server_BatteryService(env); |
register_android_server_UsbDeviceManager(env); |
register_android_server_UsbHostManager(env); |
register_android_server_VibratorService(env); |
register_android_server_SystemServer(env); |
register_android_server_location_GpsLocationProvider(env); |
register_android_server_connectivity_Vpn(env); |
+-------------------------+
return JNI_VERSION_1_4; | 间接加载
} |
v
三、cat frameworks/base/services/jni/com_android_server_BatteryService.cpp
......
namespace android { #define POWER_SUPPLY_PATH "/sys/class/power_supply" static void android_server_BatteryService_update(JNIEnv* env, jobject obj)
{
setBooleanField(env, obj, gPaths.acOnlinePath, gFieldIds.mAcOnline);
setBooleanField(env, obj, gPaths.usbOnlinePath, gFieldIds.mUsbOnline);
setBooleanField(env, obj, gPaths.wirelessOnlinePath, gFieldIds.mWirelessOnline);
setBooleanField(env, obj, gPaths.batteryPresentPath, gFieldIds.mBatteryPresent); setIntField(env, obj, gPaths.batteryCapacityPath, gFieldIds.mBatteryLevel);
setVoltageField(env, obj, gPaths.batteryVoltagePath, gFieldIds.mBatteryVoltage);
setIntField(env, obj, gPaths.batteryTemperaturePath, gFieldIds.mBatteryTemperature); char prop[];
// always report AC plug-in and capacity 100% if emulated.battery is set to 1
property_get("sys.emulated.battery", prop, "");
if (!strcmp(prop, "")){
env->SetBooleanField(obj, gFieldIds.mAcOnline, true);
env->SetIntField(obj, gFieldIds.mBatteryLevel, );
} const int SIZE = ;
char buf[SIZE]; if (readFromFile(gPaths.batteryStatusPath, buf, SIZE) > )
env->SetIntField(obj, gFieldIds.mBatteryStatus, getBatteryStatus(buf));
else
env->SetIntField(obj, gFieldIds.mBatteryStatus,
gConstants.statusUnknown); if (readFromFile(gPaths.batteryHealthPath, buf, SIZE) > )
env->SetIntField(obj, gFieldIds.mBatteryHealth, getBatteryHealth(buf)); if (readFromFile(gPaths.batteryTechnologyPath, buf, SIZE) > )
env->SetObjectField(obj, gFieldIds.mBatteryTechnology, env->NewStringUTF(buf));
} static JNINativeMethod sMethods[] = {
/* name, signature, funcPtr */
{"native_update", "()V", (void*)android_server_BatteryService_update},
}; int register_android_server_BatteryService(JNIEnv* env)
{
......
return jniRegisterNativeMethods(env, "com/android/server/BatteryService", sMethods, NELEM(sMethods));
} |
|
} /* namespace android */ |
V
四、cat frameworks/base/services/java/com/android/server/BatteryService.java
......
public final class BatteryService extends Binder { ......
private native void native_update(); ......
private void updateLocked() {
if (!mUpdatesStopped) {
// Update the values of mAcOnline, et. all.
native_update(); // Process the new values.
processValuesLocked();
}
}
......
}