如何从其他类的字符串中获取值到Android中的类？

Question

我的代码是这样的，创建了一个构造函数。我想从homepage.java访问字符串到login.php。但android给我一个错误“访问构造函数不允许”..我做错了吗？请帮助。 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

您已经申报HomePage的构造与没有修饰符。这意味着只有同一个包中的类才能调用它，这就是为什么你会得到这个错误。

HomePage() 
{ 
    ... 

让它public

public HomePage() 
{ 
    ...