Handler处理HTTP请求的封装

来源：互联网发布：欧莱雅网络营销策划书编辑：程序博客网时间：2024/04/26 17:50

项目中经常用到大量的向server请求，然后返回json，显示到手机上。

1. 封装Handler

    public class RequestHandler extends Handler {
   protected String returnString = null;

   /**
   * @param returnString the returnString to set
   */
   public void setReturnString(String returnString) {
       this.returnString = returnString;
   }

   /* (non-Javadoc)
   * @see android.os.Handler#handleMessage(android.os.Message)
   */
   @Override
   public void handleMessage(Message msg) {
       // TODO Auto-generated method stub
       super.handleMessage(msg);
   }
}

2. 封装Thread

public class RequestHttp extends Thread {
   private RequestHandler handle=null;
    String url=null;
    HashMap <String ,Object> params=null;
    String resMsg="";
    private Message message =null;

    public RequestHttp(RequestHandler handler,HashMap<String, Object> params) {
       if(null == handler )
           return;
       this.handle = handler;
       message = handle.obtainMessage();
       this.url=HttpUtil.HttpDataSyncServiceUrl;
       this.params=params;
    }

    @Override
   public void run() {
       super.run();
       try {
           //web请求,result为返回结果
           callHttp();
           message.what =Constant.HTTP_RESPONSE_OK;
       } catch (Exception ex) {
           message.what =Constant.EXCEPTION;
           resMsg=ex.getMessage();
           //resObj.setResInfo(resMsg);
       } finally {
           handle.sendMessage(message);
       }
   }

    private void callHttp() {
           Log.d("Time","Callstart:"+String.valueOf(new Date()));
           // web请求
           handle.setReturnString(HttpUtil.sendPostRequest(params, url));
           // 得到返回结果
           Log.d("Time","CallEnd:"+String.valueOf(new Date()));
    }

}

3. 使用

//call server to down data
   private void callServerFr(){
       processInfo = new TransparentDialog(ctx);
       processInfo.initProgressDialog();
       HashMap<String, Object> params = new HashMap<String, Object>();
       params.put("action", "GETFRCAMPS");// 加入方法参数
       //params.put("userId", app.getUid());// 加入参数
       params.put("storeCode", currStore.getStoreCode());
       params.put("camps", getCampiagnVersionFr());
       (new RequestHttp(handlerFr, params)).start();
   }

   // 生成消息对象
   RequestHandler handlerFr = new RequestHandler(){
        public void handleMessage(Message m){
           switch (m.what) {
           case Constant.HTTP_RESPONSE_OK:
               if (returnString != null) {
                   boolean res=dao.saveFrCampaignFromServer(returnString);
                   if(res){
                       Intent intent = new Intent();
                       intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                       intent.setClass(CampaignHome.this, FrCampaignList.class);
                       startActivity(intent);
                   }else{
                       PageUtil.inform(ctx,"出错了，请重试" );
                   }
               }
               if (null != processInfo)
                   processInfo.progressDialog.dismiss();
               break;
           default:
               if (null != processInfo)
                   processInfo.progressDialog.dismiss();
           }
       }
    };