Android check if JSON response is null

Question

In an Android App I need to check if a JSON response is null. This is my code:

private void showJSON(String response) {
    String nombre = "";
    String direccion = "";
    String codigo = "";
    try {
        JSONObject jsonObject = new JSONObject(response);
        JSONArray result = jsonObject.getJSONArray(Config.JSON_ARRAY);
        JSONObject collegeData = result.getJSONObject(0);
        nombre = collegeData.getString(Config.KEY_NAME);
        direccion = collegeData.getString(Config.KEY_ADDRESS);
        codigo = collegeData.getString(Config.KEY_VC);
    } catch (JSONException e) {
        e.printStackTrace();
    }

    if (nombre.isEmpty()) {
        nombre = "AGENCIA NO ENCONTRADA";
        textViewResult.setText("Agencia:\t" + nombre);
    }
    else {

        textViewResult.setText("Agencia:\t" + nombre + "\nDireccion:\t" + direccion + "\nCodigo:\t" + codigo);
    }
}

I have tried with:

if (nombre.isEmpty()) {

if (nombre == null) {

if (nombre == "") {

But the app always shows the else part of the if condition. And the output if there are no data from JSON is always:

Agencia: null Direccion null Codigo: null

If there are data, the output is the right output. Any help is welcome

Lazy Ninja · Accepted Answer · 2016-11-16 01:00:06Z

3

In android use TextUtils.isEmpty() to check null instead. But I think in your case nombre is not null.
String nombre = "null"; likely in your case.

answered Nov 16, 2016 at 1:00

Lazy Ninja

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2 Comments

mvasco Over a year ago

You are right, In my case nombre == "null" is right. Thank you,

Lazy Ninja Over a year ago

Glad it helps! ;-)

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