how create JSON file with variable of type String

Question

i have a variable of type String and i need create a json file with this variable.

I need to create JSON file with content of variable "result".

I hope that you can help me!

Thanks in advance!

@TargetApi(Build.VERSION_CODES.KITKAT)
public String showResult(View v) throws IOException {

        String  result = "";

        Gson json = new Gson();
        for (Planet p : plAdapter.getBox()) {
            if (p.isSelected()){
                /*json.put("name",p.getName());
                json.put("distance",p.getDistance());
                json.put("quantity",p.getQuantità());*/
                result=result+json.toJson(p);


            }
        }
         //result=json.toString();

        String path = Environment.getExternalStorageDirectory()
                .getAbsolutePath() + "/droidText/";

        //FileWriter file=null;

    /*  try {
            file = new FileWriter(path+"filename5.json");
            file.write(result);


        }catch(IOException ie){}
        finally{


            file.flush();
            file.close();
        }*/try(FileWriter file = new FileWriter(path + "filename.json"))  {
        //  file=new FileWriter(path+"filename100.json");
        /*FileWriter file = new FileWriter(path+"filename31.json");
            file.write(result);
        file.close();
        */
            json.toJson(result);
            //System.out.println("Successfully wrote Json result to file.");
        /*catch(IOException r){

        }*/
        }catch (IOException e){

        }
        System.out.println(result);
        return result;

    }

create JSONObject using all values

ρяσѕρєя K
– ρяσѕρєя K

2016-06-15 07:35:25 +00:00
Commented Jun 15, 2016 at 7:35 — ρяσѕρєя K
– ρяσѕρєя K, Commented Jun 15, 2016 at 7:35

Bill the Lizard · Accepted Answer · 2016-09-09 14:39:25Z

2

public static String showResult(View v) {
        String  result = "";
        JsonObject json = new JsonObject():
         for (Planet p : plAdapter.getBox()) {
                    if (p.isSelected()){
                       json.put("name",p.getName());
                       json.put("distance",p.getDistance());
                       json.put("quantity",p.getQuantità());
                    }
           }
         result = json.toString();
         FileWriter file = null;
         try { 
                file = new FileWriter("/path/filename.json");
                file.write(result); 
         }catch(IOException ie){}
         finally{ 
           file.flush();
           file.close();
         }
     return result;
}

edited Sep 9, 2016 at 14:39

Bill the Lizard

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answered Jun 15, 2016 at 7:42

Rajan Kali

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10 Comments

Abhinav Pawar Over a year ago

he needs to create a json file not JSon object

Abdul Fatir Over a year ago

This does not answer the question.

ZAO Over a year ago

@rajanks with your example i store on smartphone file JSON? i need to store it

Rajan Kali Over a year ago

can i get a screeshot?

ZAO Over a year ago

@rajanks can you help me please? I added screenshot under your code

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Nikhil Vibhav · Accepted Answer · 2016-06-15 12:33:17Z

1

A little modification to the same answer above by @rajan-ks. This one uses try-with-resource statement to declare a FileWriter instance. You don't need to close the FileWriter instance and also no need to catch the IOException as it is suppressed (as per [Java Language Specification 14.20.3])

Update 1: Updated showResult() to work with gson.

public static String showResult(View v) throws IOException {
    String result = "";
    Gson json = new Gson();

    for (Planet p : plAdapter.getBox()) {
        if (p.isSelected()) {
            result = result + json.toJson(p);
        }
    }

    String path = Environment.getExternalStorageDirectory()
            .getAbsolutePath() + "/droidText/";

    try (FileWriter file = new FileWriter(path + "filename.json")) {
        json.toJson(result, file);
    }

    return result;
}

edited Jun 15, 2016 at 12:33

answered Jun 15, 2016 at 10:28

Nikhil Vibhav

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16 Comments

ZAO Over a year ago

when i click on JSON file to open it with JSON viewer on my smartphone, the file is all white...

Nikhil Vibhav Over a year ago

@ZAO: Which JSON framework you're using, as this works at my end? I'm using Google Gson, though not on Android.

ZAO Over a year ago

with json viewer(app for Android) it doesn't work....you can try with my same app and you can see that it doesn't work

Nikhil Vibhav Over a year ago

No, what I meant was which gradle dependency provides you with JsonObject (Jackson, or Gson, or JSON.simple, or something else)? Also, can you share the exact showResult method that you're using?

ZAO Over a year ago

my grade dependency is compile fileTree(dir: 'libs', include: ['*.jar']) compile 'com.android.support:appcompat-v7:23.3.0' compile 'com.android.support:design:23.3.0' compile 'com.android.support:support-v4:23.3.0' compile files('libs/tinydb-0.0.9.jar') compile files('libs/droidText.0.2.jar')...now i edited code so you can see my method complete

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