public class finder extends AppCompatActivity{

    public static final String JSON_URL = "insert url here";
    public static final String KEY_SEARCH = "search";

    private SearchView searchView;
    private ListView listView;
    private String search;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_finder);

        searchView = (SearchView) findViewById(R.id.sv);
        listView = (ListView) findViewById(R.id.lv);


        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
            @Override
            public boolean onQueryTextSubmit(String query) {
                sendRequest();
                return true;
            }

            @Override
            public boolean onQueryTextChange(String newText) {
                return false;
            }
        });
    }
    private void sendRequest(){

        StringRequest stringRequest = new StringRequest(Request.Method.POST, JSON_URL,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        showJSON(response);
                    }
                },
                new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        Toast.makeText(finder.this,error.toString(),Toast.LENGTH_LONG).show();
                    }
                }){
            @Override
            protected Map<String,String> getParams(){
                Map<String,String> params = new HashMap<>();
                params.put(KEY_SEARCH,search);
                return params;
            }
        };

        RequestQueue requestQueue = Volley.newRequestQueue(this);
        requestQueue.add(stringRequest);
    }

    private void showJSON(String json){
        ParseJSON pj = new ParseJSON(json);
        pj.parseJSON();
        CustomList cl = new CustomList(this, ParseJSON.course,ParseJSON.school,ParseJSON.address);
        listView.setAdapter(cl);
    }

}

public class ParseJSON {
    public static String[] course;
    public static String[] school;
    public static String[] address;

    public static final String JSON_ARRAY = "Result";
    public static final String KEY_COURSE = "Course";
    public static final String KEY_SCHOOL = "School";
    public static final String KEY_ADDRESS = "Address";

    private String json;

    public ParseJSON(String json){
        this.json = json;
    }

    protected void parseJSON(){
        JSONObject jsonObject=null;
        try {
            jsonObject = new JSONObject(json);
            JSONArray users = jsonObject.getJSONArray(JSON_ARRAY);

            course = new String[users.length()];
            school = new String[users.length()];
            address = new String[users.length()];

            for(int i=0;i< users.length();i++){
                JSONObject jo = users.getJSONObject(i);
                course[i] = jo.getString(KEY_COURSE);
                school[i] = jo.getString(KEY_SCHOOL);
                address[i] = jo.getString(KEY_ADDRESS);
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }
}

public class CustomList extends ArrayAdapter<String> {
    private String[] course;
    private String[] school;
    private String[] address;
    private Activity context;

    public CustomList(Activity context, String[] course, String[] school, String[] address) {
        super(context, R.layout.list_view_layout, course);
        this.context = context;
        this.course = course;
        this.school = school;
        this.address = address;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        LayoutInflater inflater = context.getLayoutInflater();
        View listViewItem = inflater.inflate(R.layout.list_view_layout, null, true);
        TextView ViewCourse = (TextView) listViewItem.findViewById(R.id.textViewCourse);
        TextView ViewSchool = (TextView) listViewItem.findViewById(R.id.textViewSchool);
        TextView ViewAddress = (TextView) listViewItem.findViewById(R.id.textViewAddress);

        ViewCourse.setText(course[position]);
        ViewSchool.setText(school[position]);
        ViewAddress.setText(address[position]);

        return listViewItem;
    }
}

<?php

$DBserver = 'localhost';
$DBuser = 'root';
$DBpassword = '';
$DBname = 'finder';

$conn=@mysqli_connect($DBserver, $DBuser, $DBpassword, $DBname);

if ($conn->connect_error)
{
  trigger_error('Database connection failed: '  . $conn->connect_error, E_USER_ERROR);
}

    $output= array();

    if(isset($_POST['search']))
    {
        $searchq = $_POST['search'];

        //$searchq = preg_replace("#[^0-9a-z]#i","",$searchq);

        $sql = "SELECT * FROM search WHERE search_course LIKE '%$searchq%'";

        $query = mysqli_query($conn, $sql);

        $count = mysqli_num_rows($query);

        if ($count == 0)
        {
            $output = 'There was no search result';
        }
        else
        {
            while ($row = mysqli_fetch_array($query))
            {
                array_push ($output, array("Course"=>$row['search_course'],
                "School"=>$row['search_school'], "Address"=>$row['search_location']
                ));

                echo json_encode(array("Result"=>$output));
            }

        }
    }
    mysqli_close($conn)
?>