返回值型別的寫法和位置不太一樣，模仿檔案中其他位置的寫法即可，如：

frameworks/base/services/core/java/com/android/server/pm/Installer.java

/**@hide*/
public boolean createDirectory(String path) {
try {
return mInstalld.createDirectory(path);  //IBinder binder = ServiceManager.getService("installd");mInstalld = IInstalld.Stub.asInterface(binder);
    } catch (Exception e) {
        e.printStackTrace();
    }

return false;
}
------------------------------------------------------------------------------------------
 

frameworks/native/cmds/installd/InstalldNativeService.h

binder::Status createDirectory(const std::string& path, bool* _aidl_return);
...
}
--------------------------------------------------------------------------------------------
frameworks/native/cmds/installd/InstalldNativeService.cp

binder::Status InstalldNativeService::
 
createDirectory(const std::string& dirPath, bool* _aidl_return) {
    LOG(DEBUG) << "installd handling createDirectory, path: " << dirPath.c_str();
    ...
*_aidl_return = false;
return ok();
}