Android通过访问网页查看网页源码实例详解

<!--访问网络的权限--> 
<uses-permission android:name="android.permission.internet"/> 

/** 
   * 获取网页html源代码 
   * @param path 网页路径 
   */ 
  public static string gethtml(string path) throws exception { 
    url url=new url(path); 
    httpurlconnection conn=(httpurlconnection)url.openconnection(); 
    conn.setconnecttimeout(5000); 
    conn.setrequestmethod("get"); 
    if(conn.getresponsecode()==200){ 
      inputstream instream=conn.getinputstream(); 
      byte[] data=read(instream); 
      string html=new string(data,"utf-8"); 
      return html; 
    } 
    return null; 
  } 
 
  /** 
   * 读取流中的数据 
   */ 
  public static byte[] read(inputstream inputstream) throws ioexception { 
    bytearrayoutputstream outputstream=new bytearrayoutputstream(); 
    byte[] b=new byte[1024]; 
    int len=0; 
    while((len=inputstream.read(b))!=-1){ 
      outputstream.write(b); 
    } 
    inputstream.close(); 
    return outputstream.tobytearray(); 
  } 

public class htmlviewactivity extends activity { 
 
  private edittext pathtext; 
  private textview codeview; 
  @override 
  public void oncreate(bundle savedinstancestate) { 
    super.oncreate(savedinstancestate); 
    setcontentview(r.layout.main); 
    pathtext=(edittext) findviewbyid(r.id.pagepath);//网页路径 
    codeview=(textview)findviewbyid(r.id.codeview);//显示获得的源码 
    button button=(button) findviewbyid(r.id.button);//查看按钮 
    button.setonclicklistener(new buttonclicklistener());//按钮事件 
  } 
  /** 
   * 查看按钮处理事件 
   */ 
  private final class buttonclicklistener implements view.onclicklistener{ 
    @override 
    public void onclick(view v) { 
      string path=pathtext.gettext().tostring(); 
      try { 
        string html=pageservice.gethtml(path); 
        codeview.settext(html); 
      } catch (exception e) { 
        e.printstacktrace(); 
        toast.maketext(getapplicationcontext(), r.string.error, 1); 
      } 
    } 
  } 
}