How to write transient fields to a file in Android?












1















I am writing my POJO into a file using Gson. I need to benefit from a transient file to manage serialization/deserialization. When I make this field transient, I am unable to write/read it to/from a file. So this fault is originating from Gson settings or File structure in Android? Thanks in advance.




My Gson:




@Provides

    @Singleton

    Gson provideGson() {

        return new GsonBuilder()

                .setFieldNamingPolicy(FieldNamingPolicy.IDENTITY)

                .serializeNulls()

                .setLenient()

                .setDateFormat(Constants.GSON_DATE_FORMAT)

                .excludeFieldsWithoutExposeAnnotation()

                .create();

    }



Transient field in POJO




@Expose

private transient boolean pdfCreated; --> not visible in the file





java gson transient







share|improve this question




















  • 3





    But the transient keyword is used in Gson (or other serializers) to mark the field to not to be written to file or other serialization techniques. You're defeating the purpose of transient then. Why can't you remove the transient keyword if you want to serialize it?

    – Darwind
    Nov 27 '18 at 7:38






  • 1





    Thanks a lot, @Darwind and GhostCat now I understand its purpose. I confused by its usage. Thanks for illuminating me :)

    – nuhkoca
    Nov 27 '18 at 7:47











  • @GhostCat accepted your answer :)

    – nuhkoca
    Nov 27 '18 at 8:14











  • me, too! Thanks again!

    – nuhkoca
    Nov 27 '18 at 8:43
















1















I am writing my POJO into a file using Gson. I need to benefit from a transient file to manage serialization/deserialization. When I make this field transient, I am unable to write/read it to/from a file. So this fault is originating from Gson settings or File structure in Android? Thanks in advance.




My Gson:




@Provides

    @Singleton

    Gson provideGson() {

        return new GsonBuilder()

                .setFieldNamingPolicy(FieldNamingPolicy.IDENTITY)

                .serializeNulls()

                .setLenient()

                .setDateFormat(Constants.GSON_DATE_FORMAT)

                .excludeFieldsWithoutExposeAnnotation()

                .create();

    }



Transient field in POJO




@Expose

private transient boolean pdfCreated; --> not visible in the file





java gson transient







share|improve this question




















  • 3





    But the transient keyword is used in Gson (or other serializers) to mark the field to not to be written to file or other serialization techniques. You're defeating the purpose of transient then. Why can't you remove the transient keyword if you want to serialize it?

    – Darwind
    Nov 27 '18 at 7:38






  • 1





    Thanks a lot, @Darwind and GhostCat now I understand its purpose. I confused by its usage. Thanks for illuminating me :)

    – nuhkoca
    Nov 27 '18 at 7:47











  • @GhostCat accepted your answer :)

    – nuhkoca
    Nov 27 '18 at 8:14











  • me, too! Thanks again!

    – nuhkoca
    Nov 27 '18 at 8:43














1












1








1








I am writing my POJO into a file using Gson. I need to benefit from a transient file to manage serialization/deserialization. When I make this field transient, I am unable to write/read it to/from a file. So this fault is originating from Gson settings or File structure in Android? Thanks in advance.




My Gson:




@Provides

    @Singleton

    Gson provideGson() {

        return new GsonBuilder()

                .setFieldNamingPolicy(FieldNamingPolicy.IDENTITY)

                .serializeNulls()

                .setLenient()

                .setDateFormat(Constants.GSON_DATE_FORMAT)

                .excludeFieldsWithoutExposeAnnotation()

                .create();

    }



Transient field in POJO




@Expose

private transient boolean pdfCreated; --> not visible in the file





java gson transient







share|improve this question
















I am writing my POJO into a file using Gson. I need to benefit from a transient file to manage serialization/deserialization. When I make this field transient, I am unable to write/read it to/from a file. So this fault is originating from Gson settings or File structure in Android? Thanks in advance.




My Gson:




@Provides

    @Singleton

    Gson provideGson() {

        return new GsonBuilder()

                .setFieldNamingPolicy(FieldNamingPolicy.IDENTITY)

                .serializeNulls()

                .setLenient()

                .setDateFormat(Constants.GSON_DATE_FORMAT)

                .excludeFieldsWithoutExposeAnnotation()

                .create();

    }



Transient field in POJO




@Expose

private transient boolean pdfCreated; --> not visible in the file





java gson transient




java gson transient






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 27 '18 at 7:39









Darwind

5,81033443




5,81033443










asked Nov 27 '18 at 7:35









nuhkocanuhkoca

3081622




3081622








  • 3





    But the transient keyword is used in Gson (or other serializers) to mark the field to not to be written to file or other serialization techniques. You're defeating the purpose of transient then. Why can't you remove the transient keyword if you want to serialize it?

    – Darwind
    Nov 27 '18 at 7:38






  • 1





    Thanks a lot, @Darwind and GhostCat now I understand its purpose. I confused by its usage. Thanks for illuminating me :)

    – nuhkoca
    Nov 27 '18 at 7:47











  • @GhostCat accepted your answer :)

    – nuhkoca
    Nov 27 '18 at 8:14











  • me, too! Thanks again!

    – nuhkoca
    Nov 27 '18 at 8:43














  • 3





    But the transient keyword is used in Gson (or other serializers) to mark the field to not to be written to file or other serialization techniques. You're defeating the purpose of transient then. Why can't you remove the transient keyword if you want to serialize it?

    – Darwind
    Nov 27 '18 at 7:38






  • 1





    Thanks a lot, @Darwind and GhostCat now I understand its purpose. I confused by its usage. Thanks for illuminating me :)

    – nuhkoca
    Nov 27 '18 at 7:47











  • @GhostCat accepted your answer :)

    – nuhkoca
    Nov 27 '18 at 8:14











  • me, too! Thanks again!

    – nuhkoca
    Nov 27 '18 at 8:43








3




3





But the transient keyword is used in Gson (or other serializers) to mark the field to not to be written to file or other serialization techniques. You're defeating the purpose of transient then. Why can't you remove the transient keyword if you want to serialize it?

– Darwind
Nov 27 '18 at 7:38





But the transient keyword is used in Gson (or other serializers) to mark the field to not to be written to file or other serialization techniques. You're defeating the purpose of transient then. Why can't you remove the transient keyword if you want to serialize it?

– Darwind
Nov 27 '18 at 7:38




1




1





Thanks a lot, @Darwind and GhostCat now I understand its purpose. I confused by its usage. Thanks for illuminating me :)

– nuhkoca
Nov 27 '18 at 7:47





Thanks a lot, @Darwind and GhostCat now I understand its purpose. I confused by its usage. Thanks for illuminating me :)

– nuhkoca
Nov 27 '18 at 7:47













@GhostCat accepted your answer :)

– nuhkoca
Nov 27 '18 at 8:14





@GhostCat accepted your answer :)

– nuhkoca
Nov 27 '18 at 8:14













me, too! Thanks again!

– nuhkoca
Nov 27 '18 at 8:43





me, too! Thanks again!

– nuhkoca
Nov 27 '18 at 8:43












1 Answer
1






active

oldest

votes


















2














A distinct non-answer here: you are going down the wrong rabbit hole.



Code communicates intent. So when you mark fields as transient, you are telling your human readers (and all Java tooling) that this field should not be written/read. Whatever value your code puts into that field, you said "I don't care about it, so forget about it when (de)serializing instances of that class".



Thus, the real answer is to step back and use such keywords/annotations the way they are intended to be used.






share|improve this answer























    Your Answer






    StackExchange.ifUsing("editor", function () {
    StackExchange.using("externalEditor", function () {
    StackExchange.using("snippets", function () {
    StackExchange.snippets.init();
    });
    });
    }, "code-snippets");

    StackExchange.ready(function() {
    var channelOptions = {
    tags: "".split(" "),
    id: "1"
    };
    initTagRenderer("".split(" "), "".split(" "), channelOptions);

    StackExchange.using("externalEditor", function() {
    // Have to fire editor after snippets, if snippets enabled
    if (StackExchange.settings.snippets.snippetsEnabled) {
    StackExchange.using("snippets", function() {
    createEditor();
    });
    }
    else {
    createEditor();
    }
    });

    function createEditor() {
    StackExchange.prepareEditor({
    heartbeatType: 'answer',
    autoActivateHeartbeat: false,
    convertImagesToLinks: true,
    noModals: true,
    showLowRepImageUploadWarning: true,
    reputationToPostImages: 10,
    bindNavPrevention: true,
    postfix: "",
    imageUploader: {
    brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
    contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
    allowUrls: true
    },
    onDemand: true,
    discardSelector: ".discard-answer"
    ,immediatelyShowMarkdownHelp:true
    });


    }
    });














    draft saved

    draft discarded


















    StackExchange.ready(
    function () {
    StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53494796%2fhow-to-write-transient-fields-to-a-file-in-android%23new-answer', 'question_page');
    }
    );

    Post as a guest















    Required, but never shown

























    1 Answer
    1






    active

    oldest

    votes








    1 Answer
    1






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    2














    A distinct non-answer here: you are going down the wrong rabbit hole.



    Code communicates intent. So when you mark fields as transient, you are telling your human readers (and all Java tooling) that this field should not be written/read. Whatever value your code puts into that field, you said "I don't care about it, so forget about it when (de)serializing instances of that class".



    Thus, the real answer is to step back and use such keywords/annotations the way they are intended to be used.






    share|improve this answer




























      2














      A distinct non-answer here: you are going down the wrong rabbit hole.



      Code communicates intent. So when you mark fields as transient, you are telling your human readers (and all Java tooling) that this field should not be written/read. Whatever value your code puts into that field, you said "I don't care about it, so forget about it when (de)serializing instances of that class".



      Thus, the real answer is to step back and use such keywords/annotations the way they are intended to be used.






      share|improve this answer


























        2












        2








        2







        A distinct non-answer here: you are going down the wrong rabbit hole.



        Code communicates intent. So when you mark fields as transient, you are telling your human readers (and all Java tooling) that this field should not be written/read. Whatever value your code puts into that field, you said "I don't care about it, so forget about it when (de)serializing instances of that class".



        Thus, the real answer is to step back and use such keywords/annotations the way they are intended to be used.






        share|improve this answer













        A distinct non-answer here: you are going down the wrong rabbit hole.



        Code communicates intent. So when you mark fields as transient, you are telling your human readers (and all Java tooling) that this field should not be written/read. Whatever value your code puts into that field, you said "I don't care about it, so forget about it when (de)serializing instances of that class".



        Thus, the real answer is to step back and use such keywords/annotations the way they are intended to be used.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Nov 27 '18 at 8:11









        GhostCatGhostCat

        92.4k1688148




        92.4k1688148
































            draft saved

            draft discarded




















































            Thanks for contributing an answer to Stack Overflow!


            • Please be sure to answer the question. Provide details and share your research!

            But avoid …



            • Asking for help, clarification, or responding to other answers.

            • Making statements based on opinion; back them up with references or personal experience.


            To learn more, see our tips on writing great answers.




            draft saved


            draft discarded














            StackExchange.ready(
            function () {
            StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53494796%2fhow-to-write-transient-fields-to-a-file-in-android%23new-answer', 'question_page');
            }
            );

            Post as a guest















            Required, but never shown





















































            Required, but never shown














            Required, but never shown












            Required, but never shown







            Required, but never shown

































            Required, but never shown














            Required, but never shown












            Required, but never shown







            Required, but never shown







            -

            Popular posts from this blog

            A CLEAN and SIMPLE way to add appendices to Table of Contents and bookmarks

            Image
            0 I found a lot of questions abount appendices and ToC. Many users want appendices to be grouped in an Appendix part, however some problems arise with ToC, hyperref, PDF viewer bookmarks, and so on. There are different solutions which require extra packages, command patching and other extra code, however none of them satisfies me. I almost found an easy way to accomplish a good result, where appendices are added to bookmarks in the right way and hyperref links point to the right page. However, the number of the "Appendix" part page is wrong (it's the number of appendix A). Is there any EASY way to fix that? This is a MWE: documentclass{book} usepackage[nottoc,notlot,notlof]{tocbibind} usepackage{hyperref} begin{document} frontmatter tableofcontents mainmatter part{First} chapter{...
            Read more

            Calculate evaluation metrics using cross_val_predict sklearn

            Image
            1 In the sklearn.model_selection.cross_val_predict page it is stated: Generate cross-validated estimates for each input data point. It is not appropriate to pass these predictions into an evaluation metric. Can someone explain what does it mean? If this gives estimate of Y (y prediction) for every Y (true Y), why can't I calculate metrics such as RMSE or coefficient of determination using these results? python scikit-learn cross-validation share | improve this question edited Nov 28 '18 at 17:52 desertnaut 20.3k 7 43 79 ...
            Read more

            Insert data from modal to MySQL (multiple modal on website)

            Image
            0 I have problem with inserting data to MySQL from modal. My modal: <a href="#" class="badge badge-pill badge-success">6 komentarzy</a> <a href="#" class="badge badge-pill badge-danger">brak komentarzy</a> <a data-toggle="modal" href="#add_desk_comm_{$desk_['desk_id']}" data-target="#add_desk_comm_{$desk_['desk_id']}" class="ediiit">(dodaj)</a> <div class="modal fade" id="add_desk_comm_{$desk_['desk_id']}" tabindex="-1" role="dialog" aria-labelledby="edit_printer" aria-hidden="true"> <div class="modal-dialog" role="document"> ...
            Read more