Question

我有一个像这样写的方法......

public void getRequest(String Url) {

runOnUiThread(new Runnable() {
    public void run() {
        // TODO Auto-generated method stub

        HttpClient client = new DefaultHttpClient();
        HttpGet request = new HttpGet(url);
        try {
            HttpResponse response = client.execute(request);
            Toast.makeText(MenuUtama.this, request(response) ,Toast.LENGTH_SHORT).show();

        } catch (Exception ex) {
            ex.printStackTrace();
        }

    }
});
}

我需要能够在另一种方法中访问本地变量request，以便我可以调用request.response。我怎么能从一个完全不同的方法访问这个本地方法？

Answer 1

增加响应和请求变量的范围，我的意思是在类级别声明这些变量而不是方法级别。

Answer 2

你不能在任何函数中调用任何变量声明为局部变量。你可以用以下方式做到这一点

public class A{
    HttpGet request;
        HttpResponse response;
    void methodA(){
          request = //........
           response = //...........
    }
    void methodB{
        //here you can refer to request and response as they are the instance variables of the class.
    }
}

如果你想访问课外的那些，你必须创建一个 A类的对象，然后调用如下

A a = new A();
//now you can call a.request or a.response

但请记住，变量访问说明符应该允许你这样做。

Answer 3

我认为你正在寻找的东西是这样的：

protected Object myRequest;

public void getRequest(String Url) {
    runOnUiThread(new Runnable() {
        public void run() {
            HttpClient client = new DefaultHttpClient();
            HttpGet request = new HttpGet(url);
            try {
                HttpResponse response = client.execute(request);
                myRequest = request(response);
                Toast.makeText(MenuUtama.this, myRequest, Toast.LENGTH_SHORT).show();
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        }
    });
}

显然将Object更改为任何类request(response)，重命名myRequest，并且最好在私有实例变量上使用访问器，而不是直接对其进行保护和分配，但是希望你需要一个实例变量来保存方法调用request(response)的值。

Answer 4

您应该在类级别范围内声明您的response变量。这是你的代码。

public class YourClass{

    //Declare your request varible in a class-level scope
    //so it can be accessed by any method
    HttpGet request;


    public void getRequest(String Url) {

        runOnUiThread(new Runnable() {
            public void run() {
                 // TODO Auto-generated method stub

                HttpClient client = new DefaultHttpClient();
                HttpGet request = new HttpGet(url);
                try {
                    response = client.execute(request);
                    Toast.makeText(MenuUtama.this, request(response) ,Toast.LENGTH_SHORT).show();

                } catch (Exception ex) {
                ex.printStackTrace();
                }

            }
        });
    }

    public void otherMthod(){
        System.out.println(request); //request variable is accessible in this scope.
    }
}

如何在完全不同的方法中使用本地方法变量？

4 个答案: