Android 网络请求框架Volley实例详解

package com.Android.xiong.gridlayoutTest;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.Bitmap.Config;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.ImageView;import android.widget.Toast;import com.android.volley.Request.Method;import com.android.volley.RequestQueue;import com.android.volley.Response;import com.android.volley.VolleyError;import com.android.volley.toolbox.ImageRequest;import com.android.volley.toolbox.StringRequest;import com.android.volley.toolbox.Volley;public class NetCacheActivity extends Activity {private static final String URL = "http://sina.com";//请求的urlprivate RequestQueue mRequestQueue;private Button btn_request;private ImageView iv_request;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.main);initView(); mRequestQueue = Volley.newRequestQueue(getApplicationContext());  }private void initView() {// TODO Auto-generated method stubbtn_request = (Button) findViewById(R.id.btn_request);iv_request=(ImageView) findViewById(R.id.iv_request);}public void onClick(View v) {//volleyRequest();从网络上获取图片imageRequest();LoadImageView();//ImageLoader加载图片}private void imageRequest() {// TODO Auto-generated method stub ImageRequest mImageRequest=new ImageRequest("http://www.bz55.com/uploads/allimg/130716/1-130G6111637.jpg", new Response.Listener<Bitmap>() {            //需要的注意的是导入Response.Listener<Bitmap>别导错包！@Overridepublic void onResponse(Bitmap response) {// 将网络请求的图片返回并显示在ImageView中  try {Thread.sleep(3000);//休眠3秒 iv_request.setImageBitmap(response);Toast.makeText(getApplicationContext(), " onResponse", Toast.LENGTH_SHORT).show();Log.d(" onResponse", response.toString());} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}},0, 0, Config.RGB_565, new Response.ErrorListener() {@Overridepublic void onErrorResponse(VolleyError error) {// 默认加载图片资源iv_request.setImageResource(R.drawable.ic_launcher);Toast.makeText(getApplicationContext(), " onErrorResponse", Toast.LENGTH_SHORT).show();Log.d(" onErrorResponse", error.toString());}}); mRequestQueue.add(mImageRequest);//强图片请求添加到请求队列}public void LoadImageView() {// 利用ImageLoader异步加载图片final ImageLoader mImageLoader = new ImageLoader(mquest,new BitmapCache());ImageListener listener = ImageLoader.getImageListener(iv_request,R.drawable.voice_to_short, R.drawable.ic_launcher);        //get请求方式mImageLoader.get("http://img.my.csdn.NET/uploads/201404/13/1397393290_5765.jpeg",listener);Log.d("ImageLoader", mImageLoader.toString());}// import com.android.volley.Response.ErrorListener;private void volleyRequest() {StringRequest mRequest = new StringRequest(Method.GET, URL,new Response.Listener<String>() {@Overridepublic void onResponse(String response) {// TODO Auto-generated method stubToast.makeText(getApplicationContext(), "onResponse ",Toast.LENGTH_LONG).show();Log.d("on onResponse", response.toString());//请求成功}}, new Response.ErrorListener() {@Overridepublic void onErrorResponse(VolleyError error) {// TODO Auto-generated method stubToast.makeText(getApplicationContext(),"onErrorResponse", Toast.LENGTH_SHORT).show();Log.d("on ErrorReponse", error.toString());//请求失败}});     mRequestQueue.add(mRequest);     }}

package com.weixin.cache;import android.graphics.Bitmap;import android.support.v4.util.LruCache;import com.android.volley.toolbox.ImageLoader.ImageCache;public class BitmapCache implements ImageCache {    private LruCache<String, Bitmap> cache;    public BitmapCache() {     cache = new LruCache<String, Bitmap>(8 * 1024 * 1024) {       @Override       protected int sizeOf(String key, Bitmap bitmap) {         return bitmap.getRowBytes() * bitmap.getHeight();       }     };   }    @Override   public Bitmap getBitmap(String url) {     return cache.get(url);   }    @Override   public void putBitmap(String url, Bitmap bitmap) {     cache.put(url, bitmap);   } } 

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:id="@+id/RelativeLayout1"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:orientation="vertical" >  <ImageView    android:id="@+id/iv_request"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:scaleType="fitXY"    android:src="@drawable/bitmap" />  <Button    android:id="@+id/btn_request"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:layout_alignParentBottom="true"    android:layout_centerHorizontal="true"    android:onClick="onClick"    android:text="获取网络请求信息" /></RelativeLayout>