java - 在 Android 中无法 http 连接

Question

这段代码在 Java 中运行良好，但是当我开始在 Android 4.0 模拟器上运行它时它崩溃了。在调试时我注意到它在 httpConn.connect() 上崩溃了；行

  public class GetStringFromUrl {
public static String getString(String urlPageAdress) throws Exception
{

    URL url = new URL(urlPageAdress);
     HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();
      urlConn.setRequestProperty("Accept-Encoding", "UTF-8");
     HttpURLConnection httpConn = (HttpURLConnection) urlConn;
      httpConn.setAllowUserInteraction(false);
     httpConn.connect(); //crashes on this line dunno know why

     InputStream in = null;

     if (httpConn.getContentEncoding() != null && httpConn.getContentEncoding().toString().contains("gzip")) {
     in = new GZIPInputStream(httpConn.getInputStream());
      } else {
      in = httpConn.getInputStream();
    }
     BufferedInputStream bis = new BufferedInputStream(in);
     ByteArrayBuffer baf = new ByteArrayBuffer(1000);
     int read = 0;
      int bufSize = 1024;
      byte[] buffer = new byte[bufSize];
     while (true) {
      read = bis.read(buffer);
      if (read == -1) {
    break;
      }
     baf.append(buffer, 0, read);



     }
      String body = new String(baf.toByteArray());
    return body;
} }

方法在主 Activity 中使用

公共(public)类 MainActivity 扩展 Activity{

ToggleButton  toogleButton;
 public final static String EXTRA_MESSAGE = "ru.kazartsevaa.table.MESSAGE";
int upDown;
int SpinnerCount;
  @Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    upDown=0;


    setContentView(R.layout.activity_main);
}

public void onClick(View v) 抛出异常 { System.out.print(SpinnerCount); //if(upDown==0)//0 - вылет 1 прилет //{ 开关(v.getId()) { 案例 R.id.UpDownButton: { //toogleButton = (ToggleButton) findViewById(R.id.UpDownButton); //toogleButton.setOnCheckedChangeListener(this); } 案例 R.id.SheremetievoButton: { 旋转器 SherSpinner = (Spinner) findViewById(R.id.SheremetievoSpinner);

                    String SpinnerCount= SherSpinner.getItemAtPosition(SherSpinner.getSelectedItemPosition()).toString();
                    System.out.print(SpinnerCount);
                    new Thread(){ public void run() { 
                        try {
                            String body = GetStringFromUrl.getString("www.xyz.com");
                        } catch (Exception e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                        } }.start();

                        int crowd;






                }

        }

注意:换到新线程后，它停止了粉碎，但仍然写入

Answer 1

您是在主线程中执行此操作吗？如果您在单独的线程中执行此操作，应该可以工作。

    public void onClick(View v) {
    try{
            new Thread(){
                    public void run() {
                        GetStringFromUrl.getString("www.xyz.com");                      
                    }
            }.start();
    }catch(Exception e){
        e.printStackTrace();
    }
}