Android应用获取System权限的方法#

1. 在Android系统源码中编译#

• 在应用程序的AndroidManifest.xml中的manifest节点中加入如下属性：

android:sharedUserId="android.uid.system"

• 修改Android.mk文件（可参考源码中其他APP的Android.mk文件）

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

LOCAL_MODULE_TAGS := optional

LOCAL_SRC_FILES := \
        $(call all-java-files-under, src)

LOCAL_RESOURCE_DIR := $(LOCAL_PATH)/res

LOCAL_PACKAGE_NAME := SetTime
LOCAL_CERTIFICATE := platform

include $(BUILD_PACKAGE)

include $(CLEAR_VARS)

# Use the following include to make our test apk.
include $(call all-makefiles-under,$(LOCAL_PATH))

• 使用mm命令来编译

2. 系统签名#

在应用程序的AndroidManifest.xml中的manifest节点中加入如下属性：

android:sharedUserId="android.uid.system"

2.1 所需的工具#

• signapk.jar (prebuilts/sdk/tools/lib/)
• platform.x509.pem (build/target/product/security)
• platform.pk8 (build/target/product/security)

2.2 签名命令#

java -jar signapk.jar platform.x509.pem platform.pk8 unsigned.apk signed.apk