Save JSON file to internal memory

Question

Hey Guys I am learning JSON right now. So at first I want to learn how to create one. So I wrote this code ...

public void writeJsonFile() {
    username = usernameField.getText().toString();
    password = passwordField.getText().toString();
    JSONObject jsonObject = new JSONObject();
    try{
        jsonObject.put("username", username);
        jsonObject.put("password", password);
    }
    catch (JSONException e) {
        e.printStackTrace();
    }
}

But I have a Problem...How I can save the jSON file into the internal memory in the appfolder? And what is the code to call and read that file again?

Check this link, It describe how to save file in the answer – AlexGuerra Mar 24 '17 at 18:59 — AlexGuerra, Mar 24 '17 at 18:59

score 0 · Answer 1 · edited May 23 '17 at 12:34

0

You can call jsonObject.toString and then save and read like in the answer to this question. After reading a string from disk you would need to call

JSONObject jsonObject = new JSONObject(yourString);

to parse it back into a JsonObject.

There are also tools like Gson that help you do object to json serialization that can help avoid some of this work.

edited May 23 '17 at 12:34

Community

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answered Mar 24 '17 at 18:56

Carl Poole

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But when I use the code to read the file I'll get back something like this: "[B@9cd886" – mc.b Mar 24 '17 at 19:02
Hmm that looks like an object instead of String contents – Carl Poole Mar 24 '17 at 19:19

score 0 · Accepted Answer · edited May 23 '17 at 10:30

0

Saving the JSON per se is not really a good option. What you could do is:

Transform the JSON file into a String and save the String using SharedPrefferences and when you get it from the SharedPrefferences transform it back into a JSON.
Use a database (Realm), map your JSON to a model and save that model in the database.
I wouldn't do either of those for Username/Password cases. But I would use SharedPrefferences and store both valued independently with different keys.

Don't forget to encrypt sensitive data in the SharedPrefferences.

If you really really want to save the info in a file, check this answer.

edited May 23 '17 at 10:30

Community

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answered Mar 24 '17 at 18:58

Adrian Coman

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Okay, is it a bad way to save username and password in a txt. in the memory? – mc.b Mar 24 '17 at 19:04
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Well, it's not saved in the memory. It's saved on the internal storage. And no, it's not a good idea to save it as plain text. You should encrypt the information. Edited main answer with link. – Adrian Coman Mar 24 '17 at 19:06

Save JSON file to internal memory

2 Answers2