基于Volley框架做的加载网络图片的demo

package com.volley.demo; import android.app.Activity; import android.content.Context; import android.graphics.Bitmap; import android.graphics.Bitmap.Config; import android.os.Bundle; import android.widget.ImageView; import com.android.volley.RequestQueue; import com.android.volley.Response; import com.android.volley.VolleyError; import com.android.volley.toolbox.ImageLoader; import com.android.volley.toolbox.ImageLoader.ImageCache; import com.android.volley.toolbox.ImageLoader.ImageListener; import com.android.volley.toolbox.ImageRequest; import com.android.volley.toolbox.NetworkImageView; import com.android.volley.toolbox.Volley; public class MainActivity extends Activity { /** Called when the activity is first created. */ private ImageView imageView; NetworkImageView networkImageView; Context context; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); // initView(); //imageLoad(); networkImageLoad(); } public void initView(){ context = this; imageView = (ImageView)findViewById(R.id.imageView1); //创建一个RequestQueue对象 RequestQueue requestQueue = Volley.newRequestQueue(context); //创建ImageRequest对象 ImageRequest imageRequest = new ImageRequest( "http://c.csdnimg.cn/public/favicon.ico",//url new Response.Listener<Bitmap>() {//监听器Listener @Override public void onResponse(Bitmap response) { imageView.setImageBitmap(response); } //参数3、4表示图片宽高,Bitmap.Config.ARGB_8888表示图片每个像素占据4个字节大小 }, 0, 0, Config.ARGB_8888, new Response.ErrorListener() {//图片加载请求失败的回调Listener @Override public void onErrorResponse(VolleyError error) { imageView.setImageResource(R.drawable.ic_normal_pic); } }); //将ImageRequest加载到Queue requestQueue.add(imageRequest); } public void imageLoad(){ context = this; imageView = (ImageView)findViewById(R.id.imageView1); //创建一个RequestQueue对象 RequestQueue requestQueue = Volley.newRequestQueue(context); //创建一个ImageLoader ImageLoader imageLoader = new ImageLoader(requestQueue, new ImageCache() { @Override public void putBitmap(String url, Bitmap bitmap) { } @Override public Bitmap getBitmap(String url) { return null; } }); //ImageListener ImageListener listener = ImageLoader.getImageListener(imageView, R.drawable.ic_normal_pic, R.drawable.ic_normal_pic); //url、listener、maxWidth、maxHeight imageLoader.get("http://c.csdnimg.cn/public/favicon.ico", listener, 200, 200); } public void networkImageLoad(){ context = this; //创建一个RequestQueue对象 RequestQueue requestQueue = Volley.newRequestQueue(context); //创建一个ImageLoader ImageLoader imageLoader = new ImageLoader(requestQueue, new ImageCache() { @Override public void putBitmap(String url, Bitmap bitmap) { } @Override public Bitmap getBitmap(String url) { return null; } }); //NetworkImageView networkImageView = (NetworkImageView) findViewById(R.id.network_image_view); networkImageView.setDefaultImageResId(R.drawable.ic_normal_pic); networkImageView.setErrorImageResId(R.drawable.ic_normal_pic); //设置url和ImageLoader对象 networkImageView.setImageUrl("http://class.sise.com.cn:7001/SISEWeb/imagecode", imageLoader); } }