android http post asynctask [英] android http post asynctask

问题描述

请谁能告诉我如何使用 AsyncTask 制作 http 帖子以在后台工作以及如何将参数传递给 AsyncTask?我发现的所有示例对我来说都不够清楚，它们都是关于下载文件的.

Please can anyone tell me how to make an http post to work in the background with AsyncTask and how to pass the parameters to the AsyncTask? All the examples that I found were not clear enough for me and they were about downloading a file.

我在我的主要活动中运行此代码，我的问题是当代码将信息发送到服务器时，应用程序变慢，好像它被冻结了 2 到 3 秒然后它继续正常工作，直到下一次发送.这个http post向服务器发送了四个变量(book、libadd和time)第四个是固定的(名字)

I'm running this code in my main activity and my problem is when the code sends the info to the server the app slows down as if it is frozen for 2 to 3 sec's then it continues to work fine until the next send. This http post sends four variables to the server (book, libadd, and time) the fourth is fixed (name)

提前致谢

    public void  SticketFunction(double book, double libadd, long time){
        Log.v("log_tag", "%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% SticketFunction()");
        //HttpClient
        HttpClient nnSticket = new DefaultHttpClient();
        //Response handler
        ResponseHandler<String> res = new BasicResponseHandler();

        HttpPost postMethod = new HttpPost("http://www.books-something.com");


        try {
            List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(5);

            nameValuePairs.add(new BasicNameValuePair("book", book+""));

            nameValuePairs.add(new BasicNameValuePair("libAss", libass+""));

            nameValuePairs.add(new BasicNameValuePair("Time", time+""));

            nameValuePairs.add(new BasicNameValuePair("name", "jack"));
            //Encode and set entity
            postMethod.setEntity(new UrlEncodedFormEntity(nameValuePairs, HTTP.UTF_8));
            //Execute 
            //manSticket.execute(postMethod);
            String response =Sticket.execute(postMethod, res).replaceAll("<(.|
)*?>","");
            if (response.equals("Done")){

                //Log.v("log_tag", "!!!!!!!!!!!!!!!!!! SticketFunction got a DONE!");

            }
            else Log.v("log_tag", "!!!!!!!?????????? SticketFunction Bad or no response: " + response);

        } catch (ClientProtocolException e) {  
            // TODO Auto-generated catch block 
            //Log.v("log_tag", "???????????????????? SticketFunction Client Exception");
        } catch (IOException e) {  
            // TODO Auto-generated catch block
            //Log.v("log_tag", "???????????????????? IO Exception");
        } 
    }

}

推荐答案

起初，你把一个类如下:

At first, You put a class like following:

public class AsyncHttpPost extends AsyncTask<String, String, String> {
    interface Listener {
        void onResult(String result);
    }
    private Listener mListener;
    private HashMap<String, String> mData = null;// post data

    /**
     * constructor
     */
    public AsyncHttpPost(HashMap<String, String> data) {
        mData = data;
    }
    public void setListener(Listener listener) {
        mListener = listener;
    }

    /**
     * background
     */
    @Override
    protected String doInBackground(String... params) {
        byte[] result = null;
        String str = "";
        HttpClient client = new DefaultHttpClient();
        HttpPost post = new HttpPost(params[0]);// in this case, params[0] is URL
        try {
            // set up post data
            ArrayList<NameValuePair> nameValuePair = new ArrayList<NameValuePair>();
            Iterator<String> it = mData.keySet().iterator();
            while (it.hasNext()) {
                String key = it.next();
                nameValuePair.add(new BasicNameValuePair(key, mData.get(key)));
            }

            post.setEntity(new UrlEncodedFormEntity(nameValuePair, "UTF-8"));
            HttpResponse response = client.execute(post);
            StatusLine statusLine = response.getStatusLine();
            if(statusLine.getStatusCode() == HttpURLConnection.HTTP_OK){
                result = EntityUtils.toByteArray(response.getEntity());
                str = new String(result, "UTF-8");
            }
        }
        catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        catch (Exception e) {
        }
        return str;
    }

    /**
     * on getting result
     */
    @Override
    protected void onPostExecute(String result) {
        // something...
        if (mListener != null) {
            mListener.onResult(result)
        }
    }
}

现在.您只需编写如下几行:

Now. You just write some lines like following:

HashMap<String, String> data = new HashMap<String, String>();
data.put("key1", "value1");
data.put("key2", "value2");
AsyncHttpPost asyncHttpPost = new AsyncHttpPost(data);
asyncHttpPost.setListener(new AsyncHttpPost.Listener(){
    @Override
    public void onResult(String result) {
        // do something, using return value from network
    }
});
asyncHttpPost.execute("http://example.com");

这篇关于android http post asynctask的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！