Android之Volley使用

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

稍微做了一点儿修改
/**
     * 利用NetworkImageView显示网络图片
     */
    private void showImageByNetworkImageView(){
        String imageUrl="http://avatar.csdn.net/6/6/D/1_lfdfhl.jpg";
        RequestQueue requestQueue = Volley.newRequestQueueInDisk(ctx, "/sdcard/demo/", null);
        ImageLoader imageLoader = new ImageLoader(requestQueue, new BitmapCache());  

        mNetworkImageView.setTag("url");
        mNetworkImageView.setImageUrl(imageUrl,imageLoader);
    }  

volley源文件：volley.zip

volley的jar文件：Volley.jar.zip

使用例子：

import org.json.JSONObject;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.os.Bundle;
import android.widget.ImageView;
import com.android.volley.Request;
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.ImageListener;
import com.android.volley.toolbox.JsonObjectRequest;
import com.android.volley.toolbox.NetworkImageView;
import com.android.volley.toolbox.Volley;

public class MainActivity extends Activity {

    private Context ctx;
    private RequestQueue mQueue;
    private ImageLoader mImageLoader;

    private ImageView mImageView;
    private NetworkImageView mNetworkImageView;  

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

        this.ctx = this;
        initView();

        showImageByNetworkImageView();
    }

    private void initView(){
        mImageView=(ImageView) findViewById(R.id.imageView);
        mNetworkImageView=(NetworkImageView)findViewById(R.id.networkImageView);
    }

    /**
     * 利用Volley获取JSON数据
     */
    private void getJSONByVolley() {
        RequestQueue requestQueue = Volley.newRequestQueue(this);
        String JSONDataUrl = "http://pipes.yahooapis.com/pipes/pipe.run?_id=giWz8Vc33BG6rQEQo_NLYQ&_render=json";
        final ProgressDialog progressDialog = ProgressDialog.show(this, "This is title", "...Loading...");  

        JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(
                Request.Method.GET,
                JSONDataUrl,
                null,
                new Response.Listener<JSONObject>() {
                    @Override
                    public void onResponse(JSONObject response) {
                        System.out.println("response="+response);
                        if (progressDialog.isShowing()&&progressDialog!=null) {
                            progressDialog.dismiss();
                        }
                    }
                },
                new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError arg0) {
                           System.out.println("sorry,Error");
                    }
                });
        requestQueue.add(jsonObjectRequest);
    }  

    private void loadImageByVolley(){
        String imageUrl="http://avatar.csdn.net/6/6/D/1_lfdfhl.jpg";
        RequestQueue requestQueue = Volley.newRequestQueue(this);  

        ImageLoader imageLoader = new ImageLoader(requestQueue, new BitmapCache());
        ImageListener listener = ImageLoader.getImageListener(mImageView, R.drawable.ic_launcher,R.drawable.ic_launcher);
        imageLoader.get(imageUrl, listener);
    }  

    /**
     * 利用NetworkImageView显示网络图片
     */
    private void showImageByNetworkImageView(){
        String imageUrl="http://avatar.csdn.net/6/6/D/1_lfdfhl.jpg";
        RequestQueue requestQueue = Volley.newRequestQueueInDisk(ctx, "/sdcard/demo/", null);
        ImageLoader imageLoader = new ImageLoader(requestQueue, new BitmapCache());  

        mNetworkImageView.setTag("url");
        mNetworkImageView.setImageUrl(imageUrl,imageLoader);
    }  

}

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> mCache;  

    public BitmapCache() {
        int maxSize =  *  * ;
        mCache = new LruCache<String, Bitmap>(maxSize) {
            @Override
            protected int sizeOf(String key, Bitmap value) {
                return value.getRowBytes() * value.getHeight();
            }
        };
    }  

    @Override
    public Bitmap getBitmap(String url) {
        return mCache.get(url);
    }  

    @Override
    public void putBitmap(String url, Bitmap bitmap) {
        mCache.put(url, bitmap);
    }
}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
     >  

    <com.android.volley.toolbox.NetworkImageView
        android:id="@+id/networkImageView"
        android:layout_width="120dip"
        android:layout_height="120dip"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="30dip"
    />  

     <ImageView
        android:id="@+id/imageView"
        android:layout_width="120dip"
        android:layout_height="120dip"
        android:layout_centerInParent="true"
    />  

</RelativeLayout>