How to write to a.json file

Question

I have some files .json in assets.

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I am currently reading only in these files.

Reading

public String loadJSONFromAsset(String Ajson) {
    String json = null;
    try {
        InputStream is = context.getAssets().open(Ajson);
        int size = is.available();
        byte[] buffer = new byte[size];
        is.read(buffer);
        is.close();
        json = new String(buffer, "UTF-8");
    } catch (IOException ex) {
        ex.printStackTrace();
        return null;
    }

    return json;
}

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How can I write on them? That is, replace all their content with another of my choice.

Answer 1

Cristian,

The ideal would be to use a JSON parser that will make it easier to manipulate this modified object than to simply edit the text of the file.

On the official website you can find several packages http://www.json.org/

Download a package, for example: https://github.com/stleary/JSON-java

Import to your project and follow the example of usage:

import org.json.JSONObject;

//instancia um novo JSONObject
JSONObject my_obj = new JSONObject();

//preenche o objeto com os campos: titulo, ano e genero
my_obj.put("titulo", "JSON Parser Exemplo");
my_obj.put("ano", 2017);
my_obj.put("genero", "Programação");

This will make it easier for you to edit your json. More information:

http://www.devmedia.com.br/trabalhando-com-json-em-java-o-pacote-org-json/25480

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I hope this helps...

Good Luck!