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try{
    HttpClient httpclient = new DefaultHttpClient();
    HttpPost httppost = new HttpPost("http://10.0.2.2/android/classname_spinner.php");
    try{
        ResponseHandler<String> responseHandler = new BasicResponseHandler();
        String responseBody = httpclient.execute(httppost,responseHandler);
        JSONObject json = new JSONObject(responseBody);

        JSONArray jArray = json.getJSONArray("output");
        arr = new String[jArray.length()+1];
        arr[0] = "-select-";
        for(int i=0;i<jArray.length();i++){
            JSONObject json_data = jArray.getJSONObject(i);
            String sclass = json_data.getString("spinner");
            arr[i+1] = sclass;
        }
    }catch (Exception e) {
        Log.e("log_tag","Error parsing classname data"+e.toString());
    }
}catch (Exception e) {
    Log.e("log_tag","Request failed"+e.toString());
}

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在activity的create方法中进行初始化

classSpinner = (Spinner) findViewById(R.id.editClass);
    ArrayAdapter<String> classNameAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item,arr);
    classNameAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    classSpinner.setAdapter(classNameAdapter);

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