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How to Populate Spinner in Android With JSON Data [Snippet]


https://dzone.com/articles/populate-spinner-from-json-data

In this tutorial, we will learn about how to populate Spinner in Android from JSON values. Spinner is a basically a drop-down list in Android. Here we are getting JSON data from this URL. We have to parse this data into Spinner.
JSON Data:
{
"success": 1,
"Name": [
{
"Country": "India"
},
{
"Country": "US"
},
{
"Country": "UK"
},
{
"Country": "Australia"
},
{
"Country": "Canada "
}
]
}

activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.techiesatish.androidspinner.MainActivity"
android:orientation="vertical"
>
<Spinner
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/country_Name"
/>
</LinearLayout>
MainActivity.java
public class MainActivity extends AppCompatActivity {
Spinner spinner;
String URL="http://techiesatish.com/demo_api/spinner.php";
ArrayList<String> CountryName;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        CountryName=new ArrayList<>();
        spinner=(Spinner)findViewById(R.id.country_Name);
        loadSpinnerData(URL);
        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
             String country=   spinner.getItemAtPosition(spinner.getSelectedItemPosition()).toString();
            Toast.makeText(getApplicationContext(),country,Toast.LENGTH_LONG).show();
            }
            @Override
            public void onNothingSelected(AdapterView<?> adapterView) {
                // DO Nothing here
            }
        });
    }
    private void loadSpinnerData(String url) {
    RequestQueue requestQueue=Volley.newRequestQueue(getApplicationContext());
        StringRequest stringRequest=new StringRequest(Request.Method.GET, url, new Response.Listener<String>() {
            @Override
            public void onResponse(String response) {
                try{
                    JSONObject jsonObject=new JSONObject(response);
                    if(jsonObject.getInt("success")==1){
                     JSONArray jsonArray=jsonObject.getJSONArray("Name");
                     for(int i=0;i<jsonArray.length();i++){
                     JSONObject jsonObject1=jsonArray.getJSONObject(i);
                     String country=jsonObject1.getString("Country");
                     CountryName.add(country);
                     }
                    }
                    spinner.setAdapter(new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_spinner_dropdown_item, CountryName));
                }catch (JSONException e){e.printStackTrace();}
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                error.printStackTrace();
            }
        });
        int socketTimeout = 30000;
        RetryPolicy policy = new DefaultRetryPolicy(socketTimeout, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT);
        stringRequest.setRetryPolicy(policy);
        requestQueue.add(stringRequest);
    }
}
This is all about how to populate Spinner from JSON data.

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