Khadas Docs

If a third-party application wants to obtain system permissions, it needs to declare its UID as a system process in the AndroidManifest.xml file, and the application needs to be signed with the platform key (signature).

The third-party application's AndroidManifest.xml must include:

android:sharedUserid="android.uid.system"

1. Put the APK in the application directory, and create an Android.mk file containing the following contents:

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
# module name should match the apk name
LOCAL_MODULE := XXXX
LOCAL_MODULE_TAGS := optional
 
LOCAL_SRC_FILES := $(LOCAL_MODULE).apk
LOCAL_MODULE_CLASS := APPS
LOCAL_MODULE_SUFFIX := $(COMMON_ANDROID_PACKAGE_SUFFIX)
LOCAL_PRIVILEGED_MODULE := true
 
# use the application's own signature
# LOCAL_CERTIFICATE := PRESIGNED
# sign with the platform key
LOCAL_CERTIFICATE := platform
include $(BUILD_PREBUILT)

2. Add the name of your APK XXXX into the compile file.

PRODUCT_PACKAGES +=\
   Bluetooth \
   XXXX

3. Recompile the SDK, and the APK file will be generated in the out directory, containing the platform key.

1. According to your SBC model and system version, download the two platform key files platform.x509.pem and platform.pk8.

2. Download the Java Signing Tool signapk.jar.

3. Download the library-dependency libconscrypt_openjdk_jni.so and put it in the signlib directory.

4. Install the JDK Tool.

5. Execute the shell command:

java -Djava.library.path=signlib -jar signapk.jar platform.x509.pem platform.pk8 unsigned.apk signed.apk