如何從其他類的字符串中獲取值到Android中的類？

Question

我的代碼是這樣的，創建了一個構造函數。我想從homepage.java訪問字符串到login.php。但android給我一個錯誤「訪問構造函數不允許」..我做錯了嗎？請幫助。 HomePage.java

public class HomePage extends Activity { 

private Button clBtn; 
private Button bcBtn; 
private Button atBtn; 
public String ip=""; 

HomePage() 
{ 
    this.ip = "http://111.111.11.1/sp/"; 
} 

    public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.home_page); 
    } 
} 

login.java

public class Login extends Activity { 

private EditText etFacNo; 
private EditText etPassword; 
private Button loginBtn; 
HomePage getIP = new HomePage(); 
String url = getIP.ip; 


public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.login_page); 

    . 
    . 
    . 
    . 
    . 
    HttpClient httpclient = new DefaultHttpClient(); 
    HttpPost request = new HttpPost(url+"loginteacher.php"); 

} 
} 

Answer 1

http://docs.oracle.com/javase/tutorial/java/javaOO/accesscontrol.html

您已經申報HomePage的構造與沒有修飾符。這意味着只有同一個包中的類才能調用它，這就是爲什麼你會得到這個錯誤。

HomePage() 
{ 
    ... 

讓它public

public HomePage() 
{ 
    ...