CODEWITHSUNDEEP
androidjson
Mostafa Shakoori
Mostafa Shakoori

Reputation: 305

how check is the json Array available and exist?

I'm loading a json array in my app.but i need to know if the json array is exist or not? because if the json array isn't exist, the app will crash.

for example, I have this json:

{ 
"music1":
    [
    {
    "art":"",
                 "artist":"",
    "music":"",
     "flag":"",
                 "text":"",
                 "level":""
 }, 
    {
    "art":"",
                 "artist":"",
    "music":"",
    "flag":"",
                 "text":"",
                 "level":""
 },
]
}

and I want to know is there any json object named "music1" in my code or not, and then if there was I want to get the json array and show it in a list in my android app.

I'm looking forward a hero that could help me!

Upvotes: 4

Views: 6275

Answers (2)

walkmn
walkmn

Reputation: 2391

Check the availability of field:

if(jsonObj.has("music1")){
    //yes
}

or this case:

JSONArray mJSONArray = jsonObj.optJSONArray("nmusic1");

If array is not available mJSONArray will be null

Upvotes: 2

Miriana Itani
Miriana Itani

Reputation: 915

I wish this explanation would fit in a comment.

Anyway: 

{ 
"music1":
    [
    {
    "art":"",
                 "artist":"",
    "music":"",
     "flag":"",
                 "text":"",
                 "level":""
 }, 
    {
    "art":"",
                 "artist":"",
    "music":"",
    "flag":"",
                 "text":"",
                 "level":""
 }
]
}

Let call the above json object o. So to check if o has music1, all you need to check is write the following line:

if(o.has("music1")){
   JSONArray array= o.getJSONArray("music1");
}

Then you extract the objects of the json array :

for(int i=0;i<array.length();i++){
     array.getJSONObject(i);
}

Upvotes: 7

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