2. 修改Android.mk文件,加入LOCAL_CERTIFICATE := platform這一行
3. 使用mm命令來編譯,生成的apk系統相對應的簽名,然後push 到system/app 下面,成爲系統APK.
4. 然後就是去更新system/core/init/property_service.c 添加對應的訪問權限,比如在property_perms[] = { "syh.", AID_RADIO, 0 },
\frameworks\base\services\java\com\android\server\pm\PackageManagerService.java 的方法查看對應的添加屬性信息:
public PackageManagerService(Context context, boolean factoryTest, boolean onlyCore) {
.......
mSettings = new Settings();
mVendorSettings = new VendorSettings();
mSettings.addSharedUserLPw("android.uid.system",Process.SYSTEM_UID, ApplicationInfo.FLAG_SYSTEM);
mSettings.addSharedUserLPw("android.uid.phone", RADIO_UID, ApplicationInfo.FLAG_SYSTEM);
mSettings.addSharedUserLPw("android.uid.log", LOG_UID, ApplicationInfo.FLAG_SYSTEM);
mSettings.addSharedUserLPw("android.uid.nfc", NFC_UID, ApplicationInfo.FLAG_SYSTEM);
......
}
\frameworks\base\core\java\android\os\process.java 文件中有對應權限的相關說明.當然可以自己添加對應的權限,比如:
/**
* Defines the UID/GID for the Recording supplicant process.
* @hide
*/
public static final int RECORDING_UID = 1111;
然後可以在PackageManagerService.java中新加入它的屬性,如下代碼所示:
public PackageManagerService(Context context, boolean factoryTest, boolean onlyCore) {
.......
mSettings = new Settings();
mVendorSettings = new VendorSettings();
mSettings.addSharedUserLPw("android.uid.system",Process.SYSTEM_UID, ApplicationInfo.FLAG_SYSTEM);
mSettings.addSharedUserLPw("android.uid.phone", RADIO_UID, ApplicationInfo.FLAG_SYSTEM);
mSettings.addSharedUserLPw("android.uid.log", LOG_UID, ApplicationInfo.FLAG_SYSTEM);
mSettings.addSharedUserLPw("android.uid.nfc", NFC_UID, ApplicationInfo.FLAG_SYSTEM);
mSettings.addSharedUserLPw("android.uid.recording",Process.RECORDING_UID, ApplicationInfo.FLAG_SYSTEM);
......
}