android queue用法,如何在android中使用requestqueue

package com.test.TestTweet;

import android.app.Activity;

import android.content.Intent;

import android.net.http.RequestQueue;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.webkit.WebView;

import android.widget.Button;

import android.widget.EditText;

import org.apache.commons.codec.binary.Base64;

import java.io.ByteArrayInputStream;

import java.io.UnsupportedEncodingException;

import java.net.URLEncoder;

import java.util.HashMap;

import java.util.Map;

/**

* Initial screen with edit box for tweets and

* a web view to display the tweets from friends

*/

public class TestTweet extends Activity {

static final int GET_LOGIN_INFORMATION = 1;

WebView webView;

RequestQueue requestQueue;

String authInfo;

/**

* Called with the activity is first created.

*/

@Override

public void onCreate(Bundle icicle) {

super.onCreate(icicle);

setContentView(R.layout.main);

// Set the initial text

webView = (WebView) findViewById(R.id.webView);

webView.loadData(

"Please click on setup and enter your twitter credentials",

"text/html", "utf-8");

// When they click on the set up button show the login screen

Button button = (Button) findViewById(R.id.setup);

button.setOnClickListener(new View.OnClickListener() {

public void onClick(View v) {

Intent intent = new Intent(TwitterClient.this, TwitterLogin.class);

startSubActivity(intent, GET_LOGIN_INFORMATION);

}

});

// When they click on the Tweet! button, then get the

// text in the edit box and send it to twitter

final Activity activity = this;

Button button2 = (Button) findViewById(R.id.update);

button2.setOnClickListener(new View.OnClickListener() {

public void onClick(View v) {

Log.i("http", "Update clicked");

Map headers = new HashMap();

if (authInfo == null) {

return;

}

headers.put("Authorization", "Basic " + new String(Base64.encodeBase64(authInfo.getBytes())));

EditText user = (EditText) findViewById(R.id.updateText);

String text = null;

try {

text = "status=" + URLEncoder.encode(user.getText().toString(), "UTF-8");

Log.i("http", "with " + text);

} catch (UnsupportedEncodingException e) {

Log.e("http", e.getMessage());

}

byte[] bytes = text.getBytes();

ByteArrayInputStream baos = new ByteArrayInputStream(bytes);

// See Twitter API documentation for more information

// http://groups.google.com/group/twitter-development-talk/web/api-documentation

requestQueue.queueRequest(

"https://twitter.com/statuses/update.xml",

"POST", headers, new MyEventHandler2(activity), baos, bytes.length, false);

}

});

// Start a thread to update the tweets from friends every minute

requestQueue = new RequestQueue(this);

Thread t = new Thread(new MyRunnable(this));

t.start();

}

protected void onActivityResult(int requestCode, int resultCode,

String data, Bundle extras) {

if (requestCode == GET_LOGIN_INFORMATION && resultCode == RESULT_OK) {

// Save the user login information

authInfo = data;

}

}

}