Android开源框架Volley的使用

一、概述
Volley是google发布的一款android网络通信库，它适合效率要求较高场景以及并发场景。它有如下特点：

通信更快、更简单、更健壮。开发效率会得到很大提升，稳定性也会很高。
GET、POST请求及网络图像的高效率异步处理
可以对网络请求进行排序和优先级处理。
网络请求的缓存。
多级别取消请求。
和Activity生命周期的联动。当activity销毁时，可通过
不适合网络数据的上传和下载

二、网络数据请求

首先，要自定义一个Application，初始化一个Volley请求队列。并将Application注册到manifest文件中。还要添加网络权限。

public class MyApplication extends Application {
public static RequestQueue queue;
@Override
public void onCreate() {
super.onCreate();
        queue = Volley.newRequestQueue(getApplicationContext());
    }

public static RequestQueue getHttpQueue() {
return queue;
    }
}

StringRequest

//POST请求
private void volleyPost() {
        String url = "";
        StringRequest request = new StringRequest(Request.Method.POST, url, new Response.Listener<String>() {
@Override
public void onResponse(String s) {
//请求成功的操作
            }
        }, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError volleyError) {
//请求失败的操作
            }
        }) {
@Override
protected Map<String, String> getParams() throws AuthFailureError {
                Map<String, String> hashMap = new HashMap<String, String>();
                hashMap.put("phone", "13838383838");
                hashMap.put("key", "sbsbsbsb");
return hashMap;
            }
        };
        request.setTag("abcPost");
        MyApplication.getHttpQueues().add(request);

//GET请求
private void volleyGet() {
       String url = "http://.......?phone=13838383838&key=sbsbsbsbsb";
//1.String
        StringRequest request = new StringRequest(Request.Method.GET, url, new Response.Listener<String>() {
@Override
public void onResponse(String s) {
                Toast.makeText(MainActivity.this, "", Toast.LENGTH_SHORT).show();
            }
        }, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError volleyError) {
                Toast.makeText(MainActivity.this, "请求失败", Toast.LENGTH_SHORT).show();
            }
        });
        request.setTag("abcGet");
        MyApplication.getHttpQueues().add(request);

JsonObjectRequest

//POST
HashMap<String, String> hashMap = new HashMap<String, String>();
        hashMap.put("phone", "13838383838");
        hashMap.put("key", "sbsbsbsb");
        JSONObject object = new JSONObject(hashMap);
        JsonObjectRequest request = new JsonObjectRequest(Request.Method.POST, url, object, new Response.Listener<JSONObject>() {
            @Override
public void onResponse(JSONObject jsonObject) {

            }
        }, new Response.ErrorListener() {
            @Override
public void onErrorResponse(VolleyError volleyError) {

            }
        });
        request.setTag("abcPost");
        MyApplication.getHttpQueues().add(request);

//GET
JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, url, null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject jsonObject) {
//请求成功的操作
            }
        }, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError volleyError) {
// 请求失败的操作
            }
        });
        request.setTag("abcGet");
        MyApplication.getHttpQueues().add(request);

JsonArrayRequest

和JsonObjectRequest大同小异，略。

三、获取网络图片

首先做一下准备工作。。。

<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">

    <ImageView
        android:id="@+id/iv_img"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

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

</RelativeLayout>

//去manifest.xml中注册和添加权限
public class MyApplication extends Application {
public static RequestQueue queue;
@Override
public void onCreate() {
super.onCreate();
        queue = Volley.newRequestQueue(getApplicationContext());
    }

public static RequestQueue getHttpQueue() {
return queue;
    }
}

iv_img = (ImageView) this.findViewById(R.id.iv_img);
networkIv = (NetworkImageView) this.findViewById(R.id.net_iv);
String url = "http://www.baidu.com/img/bdlogo.png";

/**
 * 使用ImageRequest请求网络图片
 */
mageRequest request = new ImageRequest(url, new Response.Listener<Bitmap>() {
@Override
public void onResponse(Bitmap bitmap) {
          iv_img.setImageBitmap(bitmap);
     }
}, 0, 0, Bitmap.Config.RGB_565, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError volleyError) {
         iv_img.setBackgroundResource(R.mipmap.ic_launcher);
     }
});
MyApplication.getHttpQueue().add(request);

/**
 * 使用ImageLoader缓存网络图片
 */
 ImageLoader loader = new ImageLoader(MyApplication.getHttpQueue(), new BitmapCache());
        ImageLoader.ImageListener listener = ImageLoader.getImageListener(iv_img, R.mipmap.ic_launcher,
                R.mipmap.ic_launcher);
        loader.get(url, listener);

public class BitmapCache implements ImageLoader.ImageCache {
public LruCache<String, Bitmap> cache;
public int max = 10 * 1024 * 1024; //设置最大缓存大小

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

@Override
public Bitmap getBitmap(String s) {
return cache.get(s);
    }

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

/**
 * 使用NetworkImageView加载网络图片
 */
 ImageLoader loader = new ImageLoader(MyApplication.getHttpQueue(), new BitmapCache());
        networkIv.setDefaultImageResId(R.mipmap.ic_launcher);
        networkIv.setErrorImageResId(R.mipmap.ic_launcher);
        networkIv.setImageUrl(url, loader);

NetWorkResponse类

/**
 * Data and headers returned from {@link Network#performRequest(Request)}.
 */
public class NetworkResponse {
/**
 * Creates a new network response.
 * @param statusCode the HTTP status code
 * @param data Response body
 * @param headers Headers returned with this response, or null for none
 * @param notModified True if the server returned a 304 and the data was already in cache
 * @param networkTimeMs Round-trip network time to receive network response
 */
public NetworkResponse(int statusCode, byte[] data, Map<String, String> headers,
boolean notModified, long networkTimeMs) {
this.statusCode = statusCode;
this.data = data;
this.headers = headers;
this.notModified = notModified;
this.networkTimeMs = networkTimeMs;
    }

public NetworkResponse(int statusCode, byte[] data, Map<String, String> headers,
boolean notModified) {
this(statusCode, data, headers, notModified, 0);
    }

public NetworkResponse(byte[] data) {
this(HttpStatus.SC_OK, data, Collections.<String, String>emptyMap(), false, 0);
    }

public NetworkResponse(byte[] data, Map<String, String> headers) {
this(HttpStatus.SC_OK, data, headers, false, 0);
    }

/** The HTTP status code. */
public final int statusCode;

/** Raw data from this response. */
public final byte[] data;

/** Response headers. */
public final Map<String, String> headers;

/** True if the server returned a 304 (Not Modified). */
public final boolean notModified;

/** Network roundtrip time in milliseconds. */
public final long networkTimeMs;
}

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Android开源框架Volley的使用

NetWorkResponse类

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