Adding value to String[] android

Question

I want to have an example String[] images like the below dynamically, but i cannot achieve it

String[] images = new String[] { "http://image/image1", "http://image/image1", "http://image/image1"};

I have a json where it contains the image urls, below code is how i am tryig to put the json image urls to the string[] images

 String[] images = new String[]{};

 for (int i = 0; i < contacts.length(); i++) {
     JSONObject c = contacts.getJSONObject(i);

     String imagepath = c.getString("imagepath");

     images[i] = imagepath; // trying to put the values to String[] images
     }

You need to specify the length of your array when you create it. — Fustigador
– Fustigador, Commented Nov 4, 2015 at 10:10
What is that newURL you may need to assign imagepath right ? — Anoop M Maddasseri
– Anoop M Maddasseri, Commented Nov 4, 2015 at 10:24

Akash kv · Accepted Answer · 2015-11-04 10:13:45Z

3

try using Arraylist instead of array

 ArrayList<String> arraylist=new ArrayList<>();
        for (int i = 0; i < contacts.length(); i++) {
            JSONObject c = contacts.getJSONObject(i);

            String imagepath = c.getString("imagepath");

            arraylist.add(imagepath);
        }

to retrive item use arraylist.get(i);

answered Nov 4, 2015 at 10:13

Akash kv

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Comments

Anoop M Maddasseri · Accepted Answer · 2015-11-04 10:24:35Z

3

int lenth=contacts.length();

String[] images = new String[lenth];

 for (int i = 0; i < lenth; i++) {
     JSONObject c = contacts.getJSONObject(i);

     String imagepath = c.getString("imagepath");

     images[i] = imagepath ; // trying to put the values to String[] images
     }

For better looping follow Performance Tips .

edited Nov 4, 2015 at 10:24

answered Nov 4, 2015 at 10:09

Anoop M Maddasseri

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Comments

ThomasThiebaud · Accepted Answer · 2015-11-04 10:10:42Z

2

You must define a size for your String[] before using it.

String[] images = new String[contacts.length()];

for (int i = 0; i < contacts.length(); i++) {
    JSONObject c = contacts.getJSONObject(i);
    String imagepath = c.getString("imagepath");
    images[i] = newURL; // trying to put the values to String[] images
}

answered Nov 4, 2015 at 10:10

ThomasThiebaud

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3 Comments

ThomasThiebaud Over a year ago

What is the length / content of contacts ?

Mohammed Nasrullah Over a year ago

contacts is JSONArray which i get from httpclient

ThomasThiebaud Over a year ago

Did you check that contacts is not empty ?

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