Android4.0 以后不允许在主线程进行网络连接
Android4.0 以后不允许在主线程进行网络连接,否则会出现 android.os.NetworkOnMainThreadException。因此,必须另起一个线程进行网络连接方面的操作。package com.lujinhong.irmcdc.dao; import java.io.IOException; import java.net.Socket; import java.net.UnknownHostException; import java.util.Scanner; public class ResourceDao { String returnLine = "hi"; public String getAllContentByName() { Runnable r = new NetWorkHandler(); Thread thread = new Thread(r); thread.start(); try { Thread.sleep(15000); } catch (InterruptedException e) { e.printStackTrace(); } return returnLine; } private class NetWorkHandler implements Runnable { String line = "line"; Socket socket = null; Scanner scanner = null; @Override public void run() { try { socket = new Socket("time-A.timefreq.bldrdoc.gov", 13); scanner = new Scanner(socket.getInputStream()); while (scanner.hasNextLine()) { line = scanner.nextLine(); returnLine += line; } } catch (UnknownHostException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { scanner.close(); try { socket.close(); } catch (IOException e) { e.printStackTrace(); } } } } }
1、由于网络连接需要一定时间,为了在主界面上进行网络信息的展现,暂时用sleep()方法简单实现,使主线程等待网络信息读取完成。
Thread.sleep(5000);
补充:移动开发 , Android ,