Convert JSONArray to String Array

Question

I want to ask a question about converting a jsonArray to a StringArray on Android. Here is my code to get jsonArray from server.

try {
    DefaultHttpClient defaultClient = new DefaultHttpClient();
    HttpGet httpGetRequest = new HttpGet("http://server/android/listdir.php");
    HttpResponse httpResponse = defaultClient.execute(httpGetRequest);

    BufferedReader reader = new BufferedReader(new InputStreamReader(httpResponse.getEntity().getContent(),"UTF-8"));

    String json = reader.readLine();

    //JSONObject jsonObject = new JSONObject(json);
    JSONArray jsonArray = new JSONArray(json);
    Log.d("", json);

    //Toast.makeText(getApplicationContext(), json, Toast.LENGTH_SHORT).show();

} catch (Exception e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}

And this is the JSON.

[
    {"name": "IMG_20130403_140457.jpg"},
    {"name":"IMG_20130403_145006.jpg"},
    {"name":"IMG_20130403_145112.jpg"},
    {"name":"IMG_20130404_085559.jpg"},
    {"name":"IMG_20130404_113700.jpg"},
    {"name":"IMG_20130404_113713.jpg"},
    {"name":"IMG_20130404_135706.jpg"},
    {"name":"IMG_20130404_161501.jpg"},
    {"name":"IMG_20130405_082413.jpg"},
    {"name":"IMG_20130405_104212.jpg"},
    {"name":"IMG_20130405_160524.jpg"},
    {"name":"IMG_20130408_082456.jpg"},
    {"name":"test.jpg"}
]

How can I convert jsonArray that I've got to StringArray so I can get StringArray like this:

array = {"IMG_20130403_140457.jpg","IMG_20130403_145006.jpg",........,"test.jpg"};

Thank you for your help :)

Answer 1

Take a look at this tutorial. Also you can parse above json like :

JSONArray arr = new JSONArray(yourJSONresponse);
List<String> list = new ArrayList<String>();
for(int i = 0; i < arr.length(); i++){
    list.add(arr.getJSONObject(i).getString("name"));
}

Answer 2

Simplest and correct code is:

public static String[] toStringArray(JSONArray array) {
    if(array==null)
        return new String[0];
    
    String[] arr=new String[array.length()];
    for(int i=0; i<arr.length; i++) {
        arr[i]=array.optString(i);
    }
    return arr;
}

Using List<String> is not a good idea, as you know the length of the array. Observe that it uses arr.length in for condition to avoid calling a method, i.e. array.length(), on each loop.

Answer 3

public static String[] getStringArray(JSONArray jsonArray) {
    String[] stringArray = null;
    if (jsonArray != null) {
        int length = jsonArray.length();
        stringArray = new String[length];
        for (int i = 0; i < length; i++) {
            stringArray[i] = jsonArray.optString(i);
        }
    }
    return stringArray;
}

Answer 4

TERRIBLE TERRIBLE TERRIBLE hack:

String[] arr = jsonArray.toString().replace("},{", " ,").split(" ");