android – 如何使httprequest成为异步任务的示例

概述所有, 我有一个小功能的应用程序,它根据按钮点击发送的用户输入向服务器发出httprequest.我正在寻找一些帮助,使我的小应用程序与SDK 11兼容,使这个httprequest成为异步任务. 我花了几天时间阅读有关异步任务的内容,并了解原理以及使httprequest远离UI线程的原因. 但是,我无法让代码在我的情况下工作.我甚至无法编译.我已经包含在我的功能代码下面(即在尝试使httpre 所有,

我有一个小功能的应用程序,它根据按钮点击发送的用户输入向服务器发出httprequest.我正在寻找一些帮助,使我的小应用程序与SDK 11兼容,使这个httprequest成为异步任务.

我花了几天时间阅读有关异步任务的内容,并了解原理以及使httprequest远离UI线程的原因.

但是,我无法让代码在我的情况下工作.我甚至无法编译.我已经包含在我的功能代码下面(即在尝试使httprequest异步之前)

我非常感谢一些具体的帮助.我为我的垃圾代码道歉并且已经回答了这个问题的变化.

提前致谢
杰米

我的MainActivity代码如下：

package com.jrcdesign.ebookbeamer;import java.io.IOException;import org.apache.http.clIEnt.ClIEntProtocolException;import java.util.ArrayList;import java.util.List;import org.apache.http.clIEnt.httpClIEnt;import org.apache.http.clIEnt.methods.httpPost;import org.apache.http.impl.clIEnt.DefaulthttpClIEnt;import org.apache.http.nameValuePair;import org.apache.http.clIEnt.entity.UrlEncodedFormEntity;import org.apache.http.message.BasicnameValuePair;import androID.app.Activity;import androID.os.Bundle;import androID.vIEw.VIEw;import androID.Widget.button;import androID.Widget.EditText;import androID.Widget.Toast;import androID.Widget.Spinner;import androID.vIEw.VIEw.OnClickListener;public class MainActivity extends Activity {button sendbutton;button btnsubmit;EditText msgTextFIEld;EditText msg2TextFIEld;Spinner spinner1;/** Called when the activity is first created. */@OverrIDepublic voID onCreate(Bundle savedInstanceState){    super.onCreate(savedInstanceState);    // load the layout    setContentVIEw(R.layout.main);            // make message text fIEld object    msgTextFIEld = (EditText) findVIEwByID(R.ID.msgTextFIEld);    msg2TextFIEld = (EditText) findVIEwByID(R.ID.msg2TextFIEld);    // make send button object    sendbutton = (button) findVIEwByID(R.ID.sendbutton);    btnsubmit = (button) findVIEwByID(R.ID.btnsubmit);        addListenerOnbutton();    addListenerOnSpinnerItemSelection(); }                public voID addListenerOnSpinnerItemSelection() {    spinner1 = (Spinner) findVIEwByID(R.ID.spinner1);    spinner1.setonItemSelectedListener(new CustomOnItemSelectedListener());    }    // get the selected dropdown List value    public voID addListenerOnbutton() {    spinner1 = (Spinner) findVIEwByID(R.ID.spinner1);    btnsubmit = (button) findVIEwByID(R.ID.btnsubmit);    btnsubmit.setonClickListener(new OnClickListener() {      @OverrIDe      public voID onClick(VIEw v) {        Toast.makeText(MainActivity.this,"OnClickListener : " +                   "\nSpinner 1 : "+ String.valueOf(spinner1.getSelectedItem()),Toast.LENGTH_SHORT).show();      msgTextFIEld.setText("" + String.valueOf(spinner1.getSelectedItem()));      }    });    }    // Called when the SEND button is pressed    // Need to make this an async task    public voID send(VIEw v){   // get the message from the message text Box    msgTextFIEld.setText("" + String.valueOf(spinner1.getSelectedItem()));    String msg = msgTextFIEld.getText().toString();      String msg2 = msg2TextFIEld.getText().toString();      if (msg.length()>0)    {        httpClIEnt httpclIEnt = new DefaulthttpClIEnt();        httpPost httppost = new httpPost("http://54.235.198.96/test1.PHP");     try {       List<nameValuePair> nameValuePairs = new ArrayList<nameValuePair>(2);       nameValuePairs.add(new BasicnameValuePair("ID",msg2));       nameValuePairs.add(new BasicnameValuePair("message",msg));       httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));       httpclIEnt.execute(httppost);       msgTextFIEld.setText(""); // clear text Box       msg2TextFIEld.setText(""); // clear text Box       Toast.makeText(MainActivity.this,"Your request is being processed",Toast.LENGTH_LONG).show();     } catch (ClIEntProtocolException e) {         // Todo auto-generated catch block     } catch (IOException e) {         // Todo auto-generated catch block     }    }    else    {        // display message if text fIElds are empty        Toast.makeText(getBaseContext(),"All fIElds are required",Toast.LENGTH_SHORT).show();    }}}

解决方法 这是您的异步​​类：

private class AsyncTaskDownloadSomething extends        AsyncTask<String[],String,String> {    DataClassLentABook  mData;    @OverrIDe    protected voID onPreExecute() {        super.onPreExecute();        //Do some prepartations over here,before the task starts to execute        //like freeze the button and/or show a progress bar    }    @OverrIDe    protected String doInBackground(String... urls) {        // Task starts executing.        String url = urls[0];        // Execute http requests here,with one url(urls[0]),// or many urls using the urls table        // Save result in myresult        return myresult;    }    protected voID onPostExecute(String result) {               //Do modifications you want after everything is finished               //like re-enable the button,and/or hIDe a progressbar               //And of course do what you want with your result got from http-req    }}

要执行异步任务,单击按钮时,只需写下：

new AsyncTaskDownloadSomething().execute(someURL);

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