java - Android 构造和语法错误

Question

我在网上找到了这个示例代码。它似乎做了我想做的事情，向 API 发出请求，我只需要稍微定制一下。

但是，当我尝试编译它时，它给了我三行相同的错误

 Syntax error on token(s), misplaced 
 construct(s)
- Syntax error on token "setEntity", = 
 expected after this token

也许有人能看到我看不到的东西？

代码如下:

import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;

public class http {

HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://www.yoursite.com/script.php");


    List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
    nameValuePairs.add(new BasicNameValuePair("id", "12345"));
    nameValuePairs.add(new BasicNameValuePair("stringdata", "AndDev is Cool!"));
    httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

    // Execute HTTP Post Request
    HttpResponse response = httpclient.execute(httppost);


 }

nameValuePairs.add 行和 httppost.setEntity 行引发错误

Answer 1

除了 Ran 所说的之外:您可能想先学习一些基本的 Java 编程类(class)/教程。一些与编程相关的教程假设您已经熟悉这一点，并且只列出了几行不能直接使用的代码，因为它们属于方法内部。

您需要按如下方式重写您的类(“myMethodName”可以是您选择的任何其他名称)

public class http {
   public void myMethodName() {
       HttpClient httpclient = new DefaultHttpClient();
       HttpPost httppost = new HttpPost("http://www.yoursite.com/script.php");

       List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
       nameValuePairs.add(new BasicNameValuePair("id", "12345"));
       nameValuePairs.add(new BasicNameValuePair("stringdata", "AndDev is Cool!"));
       httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

       // Execute HTTP Post Request
       HttpResponse response = httpclient.execute(httppost);
   }
}

那么这段代码就无法按原样执行了。您需要创建类“http”的实例并从 Android Activity 调用其“myMethodName”方法。