AsyncTask

最新推荐文章于 2025-08-08 23:51:41 发布

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最新推荐文章于 2025-08-08 23:51:41 发布

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CC 4.0 BY-SA版权

文章标签：移动开发 java

原文链接：http://www.cnblogs.com/pastor/p/5158595.html

本文介绍了一个简单的Android应用案例，该应用通过AsyncTask异步任务加载指定URL的网页内容，并将其显示在TextView中。主要涉及的技术包括使用HttpClient发起HTTP请求、处理HTTP响应以及在Android环境中实现异步操作。

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package com.gg.test;

import java.io.IOException;

import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {

private Button bt_start;
private TextView tv_textview;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

init();
}

private void init() {
// 找对象
bt_start = (Button) findViewById(R.id.bt_start);
tv_textview = (TextView) findViewById(R.id.tv_textview);
bt_start.setOnClickListener(this);

}

@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.bt_start:
MyAsy myAsy = new MyAsy();
myAsy.execute("https://www.baidu.com/?tn=92760364_hao_pg");
break;
}
}

/**
* 异步，内部类
*
* @author gumenghao
*
*/
class MyAsy extends AsyncTask<String, String, String> {

private String str_xml;

@Override
protected String doInBackground(String... params) {
String str_internet = params[0];

HttpGet htptGet = new HttpGet(str_internet);
HttpClient httpClient = new DefaultHttpClient();
try {
HttpResponse httpResponse = httpClient.execute(htptGet);
if (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
str_xml = EntityUtils.toString(httpResponse.getEntity(),
"UTF-8");
}
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block1
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return str_xml;
}