Android String Post http

I have a code that I would like to do a "Post" of the email string after clicking the button, the code of the post apparently is correct, but the button is not working .. The logcat does not return any error..this is my code:

public class PostTeste extends AppCompatActivity {


    private Button button1;
    private EditText username;
    public String email;

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

        button1 = (Button) findViewById(R.id.button1);
        username = (EditText) findViewById(R.id.etpost);


        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String email = username.getText().toString();
              //  String password = editTextPassword.getText().toString();

                //System.out.println(email);
                //System.out.println(password);
                //String cep = mCep.getText().toString();
                //Toast.makeText(LoginActivity.this,"Botão funcionou!!!",Toast.LENGTH_LONG).show();
            }
        });
    }

            public class SendRequest extends AsyncTask<String, Void, String> {

                protected void onPreExecute() {
                }

                protected String doInBackground(String... arg0) {

                    try {

                        URL url = new URL("Api URL);

                        JSONObject postDataParams = new JSONObject();




                        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                        conn.setRequestProperty("Content-type", "application/json");
                        conn.setRequestProperty("Accept", "application/json");
                        conn.setRequestProperty("X-DreamFactory-Api-Key", "xxxxxxxxxxxxxxxxxxxxxxxxxxxxx");
                        conn.setRequestProperty("X-DreamFactory-Session-Token", "xxxxxxxxx.xxxxxxxxxxxxxxxxxxxxxxxx.xxxxxxxxxxxxxxxxx");
                        conn.setRequestProperty("Authorization", "Basic dGhpYWdvLmNhbWFyZ29AZXZvbHV0aW9uaXQuY29tLmJyOmluaWNpYWwyMDE3");
                        //conn.setRequestProperty("-d", "{}");
                        conn.setRequestMethod("POST");
                        conn.setReadTimeout(15000 /* milliseconds */);
                        conn.setConnectTimeout(15000 /* milliseconds */);
                        conn.setDoInput(true);
                        conn.setDoOutput(true);

                        postDataParams.put("email", "email");
                        //postDataParams.put("password", "password");
                        Log.e("resource", postDataParams.toString());

                        JSONObject resource = new JSONObject();
                        JSONArray array = new JSONArray();
                        array.put(postDataParams);
                        resource.put("resource", array);

                        System.out.println(resource.toString());


                        conn.connect();

                        OutputStream os = conn.getOutputStream();
                        BufferedWriter writer = new BufferedWriter(
                                new OutputStreamWriter(os, "UTF-8"));
                        //writer.write(getPostDataString(postDataParams));
                        writer.write(resource.toString());

                        writer.flush();
                        writer.close();
                        os.close();

                        int responseCode = conn.getResponseCode();

                        if (responseCode == HttpsURLConnection.HTTP_OK) {

                            BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
                            StringBuffer sb = new StringBuffer("");
                            String line = "";

                            while ((line = in.readLine()) != null) {

                                sb.append(line);
                                break;
                            }

                            in.close();
                            return sb.toString();
                        } else {
                            return new String("false : " + responseCode);
                        }
                    } catch (Exception e) {
                        return new String("Exception: " + e.getMessage());
                    }
                }

                @Override
                protected void onPostExecute(String result) {
                    Toast.makeText(getApplicationContext(), result,
                            Toast.LENGTH_LONG).show();

                }
            }

        }