班级的时间顺序

Question

我正在研究一个项目，我无法摆脱这个令人讨厌的问题：我在用户输入他的名字和密码后显示了一个Toast消息（如果是注册过程则发电子邮件）以及之后应用程序检查数据（如果是注册过程，则将其存储在数据库中）。或者至少我想这样。但实际上，一旦打开应用程序就会显示消息，导致出现“Benvenuto NULL”消息，显然它应该说“Benvenuto [USERNAME]”...我尝试使用OnComplete，但Eclipse说我：“方法onComplete（ BundA）类型MainActivity必须覆盖或实现超类型方法“.......

public class MainActivity extends Activity {
Button reg, log, fb;
EditText username, password, email;
String stringa;
String nome;
private final int SPLASH_DISPLAY_LENGHT = 1000;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    setContentView(R.layout.activity_main);
    reg = (Button) findViewById(R.id.button1);
    log = (Button) findViewById(R.id.button2);
    username = (EditText) findViewById(R.id.username);
    password = (EditText) findViewById(R.id.password);
    email = (EditText) findViewById(R.id.email);
    log.setOnClickListener(new View.OnClickListener() {

        public void onClick(View view) {
            Boolean f = false;
            EditText txtmail = (EditText) findViewById(R.id.username);
            String mail = txtmail.getText().toString();
            EditText txtpass = (EditText) findViewById(R.id.password);
            String pas = txtpass.getText().toString();

            String result = "";
            ArrayList<NameValuePair> dati = new ArrayList<NameValuePair>();
            dati.add(new BasicNameValuePair("email", mail));
            dati.add(new BasicNameValuePair("password", pas));
            InputStream is = null;

            try {
                HttpClient httpclient = new DefaultHttpClient();
                HttpPost httppost = new HttpPost(
                        "http://tripleleon.altervista.org/login.php");
                httppost.setEntity(new UrlEncodedFormEntity(dati));
                HttpResponse response = httpclient.execute(httppost);
                HttpEntity entity = response.getEntity();
                is = entity.getContent();

            } catch (Exception e) {
                Log.e("log_REMOTO",
                        "Errore nella connessione HTTP: " + e.toString());
                // Toast.makeText(this, "Connessione non riuscita",
                // Toast.LENGTH_SHORT).show();
            }

            // convert response to string

            try {
                BufferedReader reader = new BufferedReader(
                        new InputStreamReader(is, "iso-8859-1"), 8);
                StringBuilder sb = new StringBuilder();
                String line = null;
                while ((line = reader.readLine()) != null) {
                    sb.append(line + "\n");
                }
                is.close();
                result = sb.toString();

            } catch (Exception e) {
                Log.e("log_REMOTO",
                        "Errore nella conversione del risultato: "
                                + e.toString());
            }

            // paring data

            try {
                JSONArray jArray = new JSONArray(result);
                for (int i = 0; i < jArray.length(); i++) {
                    JSONObject json_data = jArray.getJSONObject(i);
                    nome = json_data.getString("idutente");
                    Log.i("log_tag",
                            ", nome: " + json_data.getString("idutente")
                                    + ", email: "
                                    + json_data.getString("email")
                                    + ", password: "
                                    + json_data.getString("password")
                                    + ", eta: "
                                    + json_data.getString("age"));

                }

            } catch (JSONException e1) {
                Log.e("log_REMOTO", "Errore json: " + e1.toString());
                f = true;
            } catch (Exception e1) {
                Log.e("log_REMOTO", "Errore JSON: " + e1.toString());
                e1.printStackTrace();
            }
        }
    });

    Toast.makeText(this, "Benvenuto " + nome, Toast.LENGTH_SHORT).show();
    reg.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            InputStream is;
            if (username.getText().length() == 0) {
                username.setText("Enter Username");
            } else if (password.getText().length() == 0) {
                password.setText("Enter Password");
            } else if (email.getText().length() == 0) {
                email.setText("Enter email");
            } else {
                try {
                    String a = username.getText().toString().trim();
                    String b = password.getText().toString().trim();
                    String c = email.getText().toString().trim();
                    HttpClient httpclient = new DefaultHttpClient();
                    HttpPost httppost = new HttpPost(
                            "http://tripleleon.altervista.org/register.php");
                    ArrayList<NameValuePair> dati = new ArrayList<NameValuePair>();
                    dati.add(new BasicNameValuePair("idutente", a));
                    dati.add(new BasicNameValuePair("password", b));
                    dati.add(new BasicNameValuePair("email", c));
                    httppost.setEntity(new UrlEncodedFormEntity(dati,
                            HTTP.UTF_8));

                    HttpResponse response = httpclient.execute(httppost);
                    HttpEntity entity = response.getEntity();
                    is = entity.getContent();
                    username.setText("");
                    password.setText("");
                    email.setText("");
                } catch (Exception e) {
                    Log.e("log_tag",
                            "Error in http connection " + e.toString());
                    Toast.makeText(getApplicationContext(),
                            "Connection error", Toast.LENGTH_SHORT).show();
                }
            }
        }
    });
}

    @Override
        public void onComplete(Bundle b){
        startActivity(main);
    }
}

P.S。：我是意大利人，所以如果你读到一些你没有得到的东西，请不要惊慌xD

Answer 1

您需要将Toast.make(...).show()移动到onClick处理程序中。

作为旁注，请避免在应用中使用硬编码字符串。使用android的资源机制（res / values / strings.xml） - 它将改变您的应用程序的输出或将其本地化为更容易的其他语言。