Android 5.x OTA Update官方文档（七、构建设备）

我们通过调用recovery_ui.cpp中make_device()函数来创建一个Device的实例，如下：

class TardisDevice : public Device {
// ... all the above methods ...
};

Device* make_device() {
return new TardisDevice();
}

编译recovery_ui.cpp

再通过前一篇对recovery_ui.cpp的介绍我们来介绍一下如何为recovery_ui.cpp创建一个静态库。

Device/yoyodyne/tardis/recovery/Android.mk

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)

LOCAL_MODULE_TAGS := eng
LOCAL_C_INCLUDES += bootable/recovery
LOCAL_SRC_FILES := recovery_ui.cpp

# should match TARGET_RECOVERY_UI_LIB set in BoardConfig.mk
LOCAL_MODULE := librecovery_ui_tardis

include $(BUILD_STATIC_LIBRARY)

然后我们在BoardConfig.mk文件中指定静态库中TARGET_RECOVERY_UI_LIB的值，如下：

device/yoyodyne/tardis/BoardConfig.mk
[...]

# device-specific extensions to the recovery UI
TARGET_RECOVERY_UI_LIB := librecovery_ui_tardis