Android采用Volley具体的例子展示完整的异步加载数据(一)

MainActivity例如下列:

package cc.cn;

import java.util.HashMap;

import org.json.JSONObject;

import android.app.Activity;

import android.content.Context;

import android.os.Bundle;

import com.android.volley.AuthFailureError;

import com.android.volley.RequestQueue;

import com.android.volley.Response;

import com.android.volley.VolleyError;

import com.android.volley.Request.Method;

import com.android.volley.toolbox.JsonObjectRequest;

import com.android.volley.toolbox.StringRequest;

import com.android.volley.toolbox.Volley;

/**

 * Demo描写叙述:

 * 去年一个项目中简单的使用了Volley,參见:

 * http://blog.csdn.net/lfdfhl/article/details/12223345

 * 近期guolin写了几篇文章具体介绍Volley,所以在此比較系统地学习一下.

 * 在本演示样例中,主要包含:

 * 1 利用Volley实现Get请求

 * 2 利用Volley实现Post请求

 * 3 利用Volley实现Json数据请求

 *

 * 注意事项:

 * 1 引入jar包volley.jar

 * 2 网络权限<uses-permission android:name="android.permission.INTERNET"/>

 *

 * 学习资料:

 * http://blog.csdn.net/guolin_blog/article/details/17482095

 * Thank you very much

 *

 */

public class MainActivity extends Activity {

	private RequestQueue mRequestQueue;

	private StringRequest mStringRequest;

	private Context mContext;

	private JsonObjectRequest mJsonObjectRequest;

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        volley_get();

        //volley_post();

        //volley_json();

    }

    //利用Volley实现Get请求

    private void volley_get(){

    	mContext=this;

    	String url="http://www.baidu.com/";

    	//1 创建RequestQueue对象

    	mRequestQueue=Volley.newRequestQueue(mContext);

    	//2 创建StringRequest对象

		mStringRequest = new StringRequest(

				url,

				new Response.Listener<String>() {

					@Override

					public void onResponse(String response) {

                        System.out.println("请求结果:"+response);

					}

				},

				new Response.ErrorListener() {

					@Override

					public void onErrorResponse(VolleyError error) {

                        System.out.println("请求错误:"+error.toString());

					}

				});

		//3 将StringRequest加入到RequestQueue

		mRequestQueue.add(mStringRequest);

    }

    //利用Volley实现Post请求

	private void volley_post() {

		String url = "http://hxyj.cwwic.cn/wap/api_cs/user.php?action=login";

		mContext = this;

		mRequestQueue = Volley.newRequestQueue(mContext);

		mStringRequest = new StringRequest(

				Method.POST,

				url,

				new Response.Listener<String>() {

					@Override

					public void onResponse(String response) {

						System.out.println("请求结果:" + response);

					}

				},

				new Response.ErrorListener() {

					@Override

					public void onErrorResponse(VolleyError error) {

						System.out.println("请求错误:" + error.toString());

					}

				}) {

			//携带參数

			@Override

			protected HashMap<String, String> getParams()throws AuthFailureError {

				HashMap<String, String> hashMap = new HashMap<String, String>();

				hashMap.put("un", "411111222");

				hashMap.put("pw", "180034111");

				return hashMap;

			}

		};

		mRequestQueue.add(mStringRequest);

	}

	 //利用Volley实现Json数据请求

	private void volley_json() {

		mContext = this;

		String url = "http://m.weather.com.cn/data/101010100.html";

		// 1 创建RequestQueue对象

		mRequestQueue = Volley.newRequestQueue(mContext);

		// 2 创建JsonObjectRequest对象

		mJsonObjectRequest = new JsonObjectRequest(

				url,

				null,

				new Response.Listener<JSONObject>() {

					@Override

					public void onResponse(JSONObject response) {

						System.out.println("请求结果:" + response.toString());

					}

				},

				new Response.ErrorListener() {

					@Override

					public void onErrorResponse(VolleyError error) {

						System.out.println("请求错误:" + error.toString());

					}

				});

		// 3 将JsonObjectRequest加入到RequestQueue

		mRequestQueue.add(mJsonObjectRequest);

	}

}

main.xml例如以下:

<?xml version="1.0" encoding="utf-8"?

>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:orientation="vertical" >

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="学习Volley(一)"

        android:layout_centerInParent="true"

     />

</RelativeLayout>

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