Android 怎样添加对应的权限UID，使用 property_set(propty, value)

1. 首先在应用程序的AndroidManifest.xml 中的manifest节点中加入android:sharedUserId ="android.uid.phone"这个属性。
2. 修改Android.mk文件，加入LOCAL_CERTIFICATE := platform这一行

3. 使用mm命令来编译，生成的apk系统相对应的签名，然后push 到system/app 下面，成为系统APK.

4. 然后就是去更新system/core/init/property_service.c添加对应的访问权限,比如在property_perms[] = { "syh.",   AID_RADIO,   0 },

\frameworks\base\services\java\com\android\server\pm\PackageManagerService.java 的方法查看对应的添加属性信息：

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 文件中有对应权限的相关说明.当然可以自己添加对应的权限,比如: 

 /**
     * Defines the UID/GID for the Recording supplicant process.
     * @hide
     */
    public static final int RECORDING_UID = 1111;

然后可以在PackageManagerService.java中新加入它的属性,如下代码所示：

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);
......

}