Android贯穿java层与c++层的值传递（JNI函数返回值）

返回值类型的写法和位置不太一样，模仿文件中其他位置的写法即可，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();
}

 
甚至可以通过在函数参数中生命参数的“in”、“out”类型来控制参数的址or值传递，更灵活的实现业务逻辑