@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    // Permission StrictMode
    if (android.os.Build.VERSION.SDK_INT > 9) {
        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
        StrictMode.setThreadPolicy(policy);
    }
    // spinner1
    final Spinner spin = (Spinner) findViewById(R.id.spinner1);

    String url = "http://localhost/customer/getCustomers.php";
    try
    {
        JSONArray data = new JSONArray(getJSONUrl(url));

        final ArrayList<HashMap<String, String>> MyArrList = new ArrayList<HashMap<String, String>>();
        HashMap<String, String> map;

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

            map = new HashMap<String, String>();
            map.put("customerID", c.getString("customerID"));
            map.put("name", c.getString("name"));
            map.put("phone", c.getString("phone"));
            MyArrList.add(map);
        }
        SimpleAdapter sAdap;
        sAdap = new SimpleAdapter(MainActivity.this, MyArrList, R.layout.activity_show,
        new String[]{"customerID", "name", "phone"}, new int[]{R.id.ColCustomerID, R.id.ColName, R.id.ColTel});
        spin.setAdapter(sAdap);

        final AlertDialog.Builder viewDetail = new AlertDialog.Builder(this);

        spin.setOnItemSelectedListener(new OnItemSelectedListener() {

            public void onItemSelected(AdapterView<?> arg0, View selectedItemView, int position, long id) {
                String sCustomerID = MyArrList.get(position).get("customerID").toString();
                String sName = MyArrList.get(position).get("name").toString();
                String sTel = MyArrList.get(position).get("phone").toString();

                viewDetail.setIcon(android.R.drawable.btn_star_big_on);
                viewDetail.setTitle("Customer Detail");
                viewDetail.setMessage("customerID : " + sCustomerID + "n" + "name : " + sName + "n" + "Tel : " + sTel);
                viewDetail.setPositiveButton("OK", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which)
                    {
                        dialog.dismiss();
                    }
                });
                viewDetail.show();
            }
            public void onNothingSelected(AdapterView<?> arg0) {
                Toast.makeText(MainActivity.this, "Your Selected : Nothing", Toast.LENGTH_SHORT).show();
            }
        });
    }
    catch (JSONException e)
    {
        e.printStackTrace();
    }
}
public String getJSONUrl(String url) {
    StringBuilder str = new StringBuilder();
    HttpClient client = new DefaultHttpClient();
    HttpGet httpGet = new HttpGet(url);
    try {
        HttpResponse response = client.execute(httpGet);
        StatusLine statusLine = response.getStatusLine();
        int statusCode = statusLine.getStatusCode();
        if (statusCode == 200) { // Download OK
            HttpEntity entity = response.getEntity();
            InputStream content = entity.getContent();
            BufferedReader reader = new BufferedReader(new InputStreamReader(content));
            String line;
            while ((line = reader.readLine()) != null) {
                str.append(line);
            }
        } else {
            Log.e("Log", "Failed to download result..");
        }
    } catch (ClientProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    return str.toString();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
}

[{"customerID":"1","name":"john","phone":"0786333210"},
{"customerID":"2","name":"sam","phone":"0786223210"},
{"customerID":"3","name":"ali","phone":"0786543210"}]

public String getJSONUrl(String url) {
    StringBuilder str = new StringBuilder();
    HttpClient client = new DefaultHttpClient();
    HttpGet httpGet = new HttpGet(url);
    try {
        HttpResponse response = client.execute(httpGet);
        StatusLine statusLine = response.getStatusLine();
        int statusCode = statusLine.getStatusCode();
        if (statusCode == 200) { // Download OK
            HttpEntity entity = response.getEntity();
            InputStream content = entity.getContent();
            BufferedReader reader = new BufferedReader  (newInputStreamReader(content));
            String line;
            while ((line = reader.readLine()) != null) {
                str.append(line);
            }
        } else {
            Log.e("Log", "Failed to download result..");
        }
    } catch (ClientProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    return str.toString();
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
}