如何使用反射更改备份服务？

Question

我在这里发布了一个关于Android 5.1的一个新行为的问题，该行为在设备上设置设备所有者时禁用备份服务...

long ident = Binder.clearCallingIdentity();
try {
    IBackupManager ibm = IBackupManager.Stub.asInterface(
        ServiceManager.getService(Context.BACKUP_SERVICE));
    ibm.setBackupServiceActive(UserHandle.USER_OWNER, false);
} catch (RemoteException e) {
    throw new IllegalStateException("Failed deactivating backup service.", e);
} finally {
    Binder.restoreCallingIdentity(ident);
}

我的目标是重新启用备份服务，理想的情况是：

ibm.setBackupServiceActive(UserHandle.USER_OWNER, false);

你能帮我做这件事吗？

Answer 1

请尝试以下代码：

    try {
        Class<?> iBackupManagerClass = Class.forName("android.app.backup.IBackupManager");
        Class<?> serviceManagerClass = Class.forName("android.os.ServiceManager");
        Class<?>[] classes = iBackupManagerClass.getDeclaredClasses();
        Class<?> stubClass = null;
        for (Class clazz : classes) {
            if (clazz.getSimpleName().equals("Stub")) {
                stubClass = clazz;
            }
        }

        Method setBackupServiceActiveMethod = iBackupManagerClass.getMethod("setBackupServiceActive", int.class, boolean.class);
        Method asInterfaceMethod = stubClass.getMethod("asInterface", IBinder.class);
        Method getServiceMethod = serviceManagerClass.getMethod("getService", String.class);

        Object ibm = asInterfaceMethod.invoke(null, getServiceMethod.invoke(null, "backup"));
        setBackupServiceActiveMethod.invoke(ibm, 0, false);

    } catch (ClassNotFoundException e) {
        Log.e("TEST", e.getMessage(), e);
    } catch (NoSuchMethodException e) {
        Log.e("TEST", e.getMessage(), e);
    } catch (InvocationTargetException e) {
        Log.e("TEST", e.getMessage(), e);
    } catch (IllegalAccessException e) {
        Log.e("TEST", e.getMessage(), e);
    }

它将需要一些重构来捕获错误...