Load simple JSON file into 2 dimensional Array in Android

Question

Driving myself crazy over the simplest thing. I have a JSON file called config.txt. The file is shown below. { "UsePipesInGuestData": true }

All I want to do is get a 2 dimensional array such that: Array[0] = UsePipesInGuestData and Array[1] = true

I have been trying for 4 hours with various attempts, my most recent is shown below: private void getConfig(){ //Function to read the config information from config.txt

    FileInputStream is;
    BufferedReader reader;

    try {
        final File configFile = new File(Environment.getExternalStorageDirectory().getPath() + "/guestlink/config.txt");
        if (configFile.exists()) {
            is = new FileInputStream(configFile);
            reader = new BufferedReader(new InputStreamReader(is));
            String line = reader.readLine();
            while (line != null) {
                line = reader.readLine();
                if(line!= null) {
                        line = line.replace("\"", "");  //Strip out Quotes
                        line = line.replace(" ", "");   //Strip out Spaces

                    if ((!line.equals("{")) || (!line.equals("}"))) {

                    } else {
                        String[] configValue = line.split(":");

                        switch (configValue[0]) {
                            case "UsePipesInGuestData":
                                if (configValue[1].equals("true")) {
                                    sharedPreferences.edit().putString("UsePipes", "true").apply();
                                } else {
                                    sharedPreferences.edit().putString("UsePipes", "false").apply();
                                }
                                break;
                        }
                    }
                }
            }
            reader.close();
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}

I cannot seem to ignore the lines with the { and } in them.

Clearly there MUST be an easier way. JAVA just seems to take an extremely large amount of code to do the simplest thing. Any help is greatly appreciated.

you can use Gson https://stackoverflow.com/questions/29965764/how-to-parse-json-file-with-gson — tebitoq, Sep 25 '17 at 15:17
Possible duplicate of [How to parse JSON in Java](https://stackoverflow.com/questions/2591098/how-to-parse-json-in-java) — Dima Kozhevin, Sep 25 '17 at 15:26

score 0 · Accepted Answer · answered Sep 25 '17 at 15:17

I believe your condition is incorrect. You try to read the file in the else of the condition (!line.equals("{")) || (!line.equals("}")). Simplifying, your code will run when the following happens:

!(!{ || !}) => { && } (applying De Morgan's law)

This means you will only run your code when the line is "{" AND it is "}" which is a contradiction. Try using simple conditions, like (!line.equals("{")) && (!line.equals("}")) (this is when you want to execute your code).

Additionally, you may be getting end of line characters (\n) in your string, which will make your condition fail ("{\n" != "{"). I suggest you debug and see the actual values you're getting in those lines.

Thanks for the fast reply. Makes sense. Sometimes I just cannot see what is right in front of me. Only been working with Android for about 2 months so still learning a lot. — Donald S Chapman, Sep 25 '17 at 15:32

Load simple JSON file into 2 dimensional Array in Android

1 Answers1