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Volley框架

2024-08-11 20:08:43   222人阅读

Volley框架

volley是谷歌官方在2013年推出的Android平台上的网络通信库

特点

  • 网络通信更快,更简单，开发效率高，稳定性高。
  • 对get和post网络请求以及网络图片高效的异步处理请求。
  • 可以对网络请求进行优先级排序处理。
  • 网络请求的缓存。
  • 多级别取消请求。
  • 和Activity生命周期的联动。

缺点
不适合数据的上传与下载

Get和Post请求接口的使用
请求对象

  • StringRequest 返回结果类型不确定(它包含后面两种)
  1.     StringRequest request = new StringRequest(Request.Method.GET, REQUEST_URL, new Response.Listener<String>() {
  2.             @Override
  3.             public void onResponse(String s) {//数据请求成功
  4.                 result.setText("请求成功:" + s);
  5.             }
  6.         }, new Response.ErrorListener() {
  7.             @Override
  8.             public void one rrorResponse(VolleyError volleyError) {//数据请求失败
  9.                 result.setText("请求失败:" + volleyError.getMessage());
  10.             }
  11.         });
  • JsonObjectRequest
  1.    JSONObject jsonRequest = new JSONObject();//Get请求传递参数jsonRequest可以为空null
  2.         JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, REQUEST_URL, null, new Response.Listener<JSONObject>() {
  3.             @Override
  4.             public void onResponse(JSONObject jsonObject) {
  5.                 result.setText("请求成功:" + jsonObject);
  6.             }
  7.         }, new Response.ErrorListener() {
  8.             @Override
  9.             public void one rrorResponse(VolleyError volleyError) {
  10.                 result.setText("请求失败:" + volleyError.getMessage());
  11.             }
  12.         });
  • JsonArrayRequest
  1.     JsonArrayRequest request = new JsonArrayRequest(REQUEST_URL, new Response.Listener<JSONArray>() {
  2.             @Override
  3.             public void onResponse(JSONArray jsonArray) {
  4.                 result.setText("请求成功:" + jsonArray);
  5.             }
  6.         }, new Response.ErrorListener() {
  7.             @Override
  8.             public void one rrorResponse(VolleyError volleyError) {
  9.                 result.setText("请求失败:" + volleyError.getMessage());
  10.             }
  11.         });

网络请求队列建立和取消队列建立

  • 建立一个全局的请求队列。
  1.  //创建请求队列
  2.     private static RequestQueue queues;
  3. //初始化请求队列
  4.    queues = Volley.newRequestQueue(getApplicationContext());
  • 建立一个请求并加入队列中。
  1. MyApplication.getQueues().add(request);
  • 取消队列
  1.  MyApplication.getQueues().cancelAll(tag);

与Activity生命周期的联动

  • 可以在Activity销毁的同时关闭请求。
  • 设置Tag标签，在onStop()里执行取消请求。
  1.    @Override
  2.     protected void onStop() {
  3.         super.onStop();
  4.         //结束请求
  5.         MyApplication.getQueues().cancelAll("StringRequest_get");
  6.     }

Volley调用实例源码展示

demo效果如下
技术分享

  • 布局文件
  1. <?xml version="1.0" encoding="utf-8"?>
  2. <LinearLayout
  3.     xmlns:android="http://schemas.android.com/apk/res/android"
  4.     xmlns:tools="http://schemas.android.com/tools"
  5.     android:id="@+id/activity_main"
  6.     android:layout_width="match_parent"
  7.     android:layout_height="match_parent"
  8.     android:orientation="vertical"
  9.     tools:context="com.xhb.app.MainActivity"
  10.     >
  12.     <ScrollView
  13.         android:layout_width="match_parent"
  14.         android:layout_height="match_parent">
  16.         <LinearLayout
  17.             android:layout_width="match_parent"
  18.             android:layout_height="match_parent"
  19.             android:orientation="vertical">
  21.             <RelativeLayout
  22.                 android:layout_width="match_parent"
  23.                 android:layout_height="wrap_content"
  24.                 android:gravity="center">
  26.                 <Button
  27.                     android:id="@+id/_StringRequestGet"
  28.                     android:layout_width="wrap_content"
  29.                     android:layout_height="wrap_content"
  30.                     android:onClick="StringRequestGet"
  31.                     android:text="StringRequestGet"
  32.                     android:textAllCaps="false"/>
  34.                 <Button
  35.                     android:id="@+id/StringRequestPost"
  36.                     android:layout_width="wrap_content"
  37.                     android:layout_height="wrap_content"
  38.                     android:layout_marginLeft="20dp"
  39.                     android:layout_toRightOf="@id/_StringRequestGet"
  40.                     android:onClick="StringRequestPost"
  41.                     android:text="StringRequestPost"
  42.                     android:textAllCaps="false"/>
  43.             </RelativeLayout>
  45.             <RelativeLayout
  46.                 android:layout_width="match_parent"
  47.                 android:layout_height="wrap_content"
  48.                 android:gravity="center">
  50.                 <Button
  51.                     android:id="@+id/JsonObjectRequestGet"
  52.                     android:layout_width="wrap_content"
  53.                     android:layout_height="wrap_content"
  54.                     android:onClick="JsonObjectRequestGet"
  55.                     android:text="JsonObjectRequestGet"
  56.                     android:textAllCaps="false"/>
  58.                 <Button
  59.                     android:id="@+id/JsonObjectRequestPost"
  60.                     android:layout_width="wrap_content"
  61.                     android:layout_height="wrap_content"
  62.                     android:layout_marginLeft="20dp"
  63.                     android:layout_toRightOf="@id/JsonObjectRequestGet"
  64.                     android:onClick="JsonObjectRequestPost"
  65.                     android:text="JsonObjectRequestPost"
  66.                     android:textAllCaps="false"/>
  67.             </RelativeLayout>
  69.             <RelativeLayout
  70.                 android:layout_width="match_parent"
  71.                 android:layout_height="wrap_content"
  72.                 android:gravity="center">
  74.                 <Button
  75.                     android:id="@+id/JsonArrayRequest"
  76.                     android:layout_width="wrap_content"
  77.                     android:layout_height="wrap_content"
  78.                     android:layout_alignParentLeft="true"
  79.                     android:layout_alignParentStart="true"
  80.                     android:layout_alignParentTop="true"
  81.                     android:onClick="JsonArrayRequest"
  82.                     android:text="JsonArrayRequest"
  83.                     android:textAllCaps="false"/>
  84.             </RelativeLayout>
  86.             <RelativeLayout
  87.                 android:layout_width="match_parent"
  88.                 android:layout_height="wrap_content"
  89.                 android:gravity="center">
  91.                 <Button
  92.                     android:id="@+id/MyRequestGet"
  93.                     android:layout_width="wrap_content"
  94.                     android:layout_height="wrap_content"
  95.                     android:onClick="MyRequestGet"
  96.                     android:text="MyRequestGet"
  97.                     android:textAllCaps="false"/>
  99.                 <Button
  100.                     android:id="@+id/MyRequestPost"
  101.                     android:layout_width="wrap_content"
  102.                     android:layout_height="wrap_content"
  103.                     android:layout_marginLeft="20dp"
  104.                     android:layout_toRightOf="@id/MyRequestGet"
  105.                     android:onClick="MyRequestPost"
  106.                     android:text="MyRequestPost"
  107.                     android:textAllCaps="false"/>
  108.             </RelativeLayout>
  110.             <RelativeLayout
  111.                 android:layout_width="match_parent"
  112.                 android:layout_height="wrap_content"
  113.                 android:gravity="center">
  115.                 <Button
  116.                     android:id="@+id/ImageRequest"
  117.                     android:layout_width="wrap_content"
  118.                     android:layout_height="wrap_content"
  119.                     android:onClick="ImageRequest"
  120.                     android:text="ImageRequest"
  121.                     android:textAllCaps="false"/>
  123.                 <Button
  124.                     android:id="@+id/ImageLoader"
  125.                     android:layout_width="wrap_content"
  126.                     android:layout_height="wrap_content"
  127.                     android:layout_marginLeft="20dp"
  128.                     android:layout_toRightOf="@id/ImageRequest"
  129.                     android:onClick="ImageLoader"
  130.                     android:text="ImageLoader"
  131.                     android:textAllCaps="false"/>
  132.             </RelativeLayout>
  134.             <RelativeLayout
  135.                 android:layout_width="match_parent"
  136.                 android:layout_height="wrap_content"
  137.                 android:gravity="center">
  139.                 <ImageView
  140.                     android:id="@+id/image_imageRequest"
  141.                     android:layout_width="100dp"
  142.                     android:layout_height="100dp"
  143.                     android:src="@mipmap/ic_launcher"
  144.                     android:textAllCaps="false"/>
  146.                 <ImageView
  147.                     android:id="@+id/image_iamgeLoader"
  148.                     android:layout_width="100dp"
  149.                     android:layout_height="100dp"
  150.                     android:layout_marginLeft="20dp"
  151.                     android:layout_toRightOf="@id/image_imageRequest"
  152.                     android:src="@mipmap/ic_launcher"
  153.                     android:textAllCaps="false"/>
  154.             </RelativeLayout>
  156.             <TextView
  157.                 android:layout_width="match_parent"
  158.                 android:layout_height="wrap_content"
  159.                 android:layout_marginTop="20dp"
  160.                 android:text="请求结果为:"/>
  162.             <TextView
  163.                 android:id="@+id/result"
  164.                 android:layout_width="match_parent"
  165.                 android:layout_height="0dp"
  166.                 android:layout_weight="1"/>
  167.         </LinearLayout>
  168.     </ScrollView>
  169. </LinearLayout>
  • 全局初始化文件
  1. public class MyApplication extends Application {
  2.     //创建请求队列
  3.     private static RequestQueue queues;
  4.     @Override
  5.     public void onCreate() {
  6.         super.onCreate();
  7.         //初始书请求队列
  8.         queues = Volley.newRequestQueue(getApplicationContext());
  9.     }
  10.     public static RequestQueue getQueues() {
  11.         return queues;
  12.     }
  13. }
  • 主要实现文件
  1. public class MainActivity extends AppCompatActivity {
  3.     public static final String BASE = "http://op.juhe.cn/onebox/weather/query";
  4.     public static final String REQUEST_URL = BASE + "?cityname=%E5%8D%81%E5%A0%B0&key=634f562a2b3900e051c6af6e2dc3017e";
  5.     public static final String IMAGE_URL = "https://pic.cnblogs.com/avatar/789527/20160825180355.png";
  6.     private TextView result;
  7.     private ImageView image_imageRequest, image_iamgeLoader;
  9.     @Override
  10.     protected void onCreate(Bundle savedInstanceState) {
  11.         super.onCreate(savedInstanceState);
  12.         setContentView(R.layout.activity_main);
  13.         result = (TextView) findViewById(R.id.result);
  14.         image_imageRequest = (ImageView) findViewById(R.id.image_imageRequest);
  15.         image_iamgeLoader = (ImageView) findViewById(R.id.image_iamgeLoader);
  16.     }
  18.     public void StringRequestGet(View view) {
  19.         //StringRequest
  20.         StringRequest request = new StringRequest(Request.Method.GET, REQUEST_URL, new Response.Listener<String>() {
  21.             @Override
  22.             public void onResponse(String s) {//数据请求成功
  23.                 result.setText("请求成功:" + s);
  24.             }
  25.         }, new Response.ErrorListener() {
  26.             @Override
  27.             public void one rrorResponse(VolleyError volleyError) {//数据请求失败
  28.                 result.setText("请求失败:" + volleyError.getMessage());
  29.             }
  30.         });
  31.         request.setTag("StringRequest_get");
  32.         MyApplication.getQueues().add(request);
  33.     }
  36.     public void StringRequestPost(View view) {
  37.         //StringRequest
  38.         StringRequest request = new StringRequest(Request.Method.POST, BASE, new Response.Listener<String>() {
  39.             @Override
  40.             public void onResponse(String s) {//数据请求成功
  41.                 result.setText("请求成功:" + s);
  42.             }
  43.         }, new Response.ErrorListener() {
  44.             @Override
  45.             public void one rrorResponse(VolleyError volleyError) {//数据请求失败
  46.                 result.setText("请求失败:" + volleyError.getMessage());
  47.             }
  48.         }) {
  49.             @Override//传递参数
  50.             protected Map<String, String> getParams() throws AuthFailureError {
  51.                 Map<String, String> map = new HashMap<>();
  52.                 map.put("key", "634f562a2b3900e051c6af6e2dc3017e");
  53.                 map.put("cityname", "十堰");
  54.                 return map;
  55.             }
  56.         };
  57.         request.setTag("StringRequestPost");
  58.         MyApplication.getQueues().add(request);
  59.     }
  61.     public void JsonObjectRequestGet(View view) {
  62.         //JsonObjectRequest
  63.         JSONObject jsonRequest = new JSONObject();//Get请求传递参数jsonRequest可以为空null
  64.         JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, REQUEST_URL, null, new Response.Listener<JSONObject>() {
  65.             @Override
  66.             public void onResponse(JSONObject jsonObject) {
  67.                 result.setText("请求成功:" + jsonObject);
  68.             }
  69.         }, new Response.ErrorListener() {
  70.             @Override
  71.             public void one rrorResponse(VolleyError volleyError) {
  72.                 result.setText("请求失败:" + volleyError.getMessage());
  73.             }
  74.         });
  75.         request.setTag("JsonObjectRequestGet");
  76.         MyApplication.getQueues().add(request);
  77.     }
  79.     public void JsonObjectRequestPost(View view) {
  80.         Map<String, String> map = new HashMap<>();
  81.         map.put("key", "634f562a2b3900e051c6af6e2dc3017e");
  82.         map.put("cityname", "十堰");
  83.         JSONObject jsonRequest = new JSONObject(map);
  84.         JsonObjectRequest request = new JsonObjectRequest(Request.Method.POST, BASE, jsonRequest, new Response.Listener<JSONObject>() {
  85.             @Override
  86.             public void onResponse(JSONObject jsonObject) {
  87.                 result.setText("请求成功:" + jsonObject.toString());
  88.             }
  89.         }, new Response.ErrorListener() {
  90.             @Override
  91.             public void one rrorResponse(VolleyError volleyError) {
  92.                 result.setText("请求失败:" + volleyError.getMessage());
  93.             }
  94.         });
  95.         request.setTag("JsonObjectRequestPost");
  96.         MyApplication.getQueues().add(request);
  97.     }
  99.     public void JsonArrayRequest(View view) {
  100.         JsonArrayRequest request = new JsonArrayRequest(REQUEST_URL, new Response.Listener<JSONArray>() {
  101.             @Override
  102.             public void onResponse(JSONArray jsonArray) {
  103.                 result.setText("请求成功:" + jsonArray);
  104.             }
  105.         }, new Response.ErrorListener() {
  106.             @Override
  107.             public void one rrorResponse(VolleyError volleyError) {
  108.                 result.setText("请求失败:" + volleyError.getMessage());
  109.             }
  110.         });
  111.         request.setTag("JsonArrayRequest");
  112.         MyApplication.getQueues().add(request);
  113.     }
  115.     public void MyRequestGet(View view) {
  116.         new VolleyRequest().RequestGet(this, REQUEST_URL, "MyRequestGet", new ResultBack(this, ResultBack.listener, ResultBack.errorListener) {
  117.             @Override
  118.             public void onSuccess(String s) {
  119.                 result.setText("请求成功:" + s);
  120.             }
  122.             @Override
  123.             public void onFailure(VolleyError volleyError) {
  124.                 result.setText("请求失败:" + volleyError.getMessage());
  125.             }
  126.         });
  127.     }
  129.     public void MyRequestPost(View view) {
  130.         Map<String, String> map = new HashMap<>();
  131.         map.put("key", "634f562a2b3900e051c6af6e2dc3017e");
  132.         map.put("cityname", "十堰");
  133.         new VolleyRequest().RequestPost(this, REQUEST_URL, "MyRequestPost", map, new ResultBack(this, ResultBack.listener, ResultBack.errorListener) {
  134.             @Override
  135.             public void onSuccess(String s) {
  136.                 result.setText("请求成功:" + s);
  137.             }
  139.             @Override
  140.             public void onFailure(VolleyError volleyError) {
  141.                 result.setText("请求失败:" + volleyError.getMessage());
  142.             }
  143.         });
  144.     }
  146.     //ImageRequest方式加载图片
  147.     public void ImageRequest(View view) {
  148.         ImageRequest request = new ImageRequest(IMAGE_URL, new Response.Listener<Bitmap>() {
  149.             @Override
  150.             public void onResponse(Bitmap bitmap) {//加载成功
  151.                 image_imageRequest.setImageBitmap(bitmap);
  152.             }
  153.         }, 0, 0, Bitmap.Config.RGB_565, new Response.ErrorListener() {//加载失败
  154.             @Override
  155.             public void one rrorResponse(VolleyError volleyError) {
  156.                 image_imageRequest.setImageResource(R.mipmap.ic_launcher);
  157.             }
  158.         });
  159.         request.setTag("ImageRequest");
  160.         MyApplication.getQueues().add(request);
  161.     }
  163.     //ImageLoader加载图片
  164.     public void ImageLoader(View view) {
  165.         ImageLoader imageLoader = new ImageLoader(MyApplication.getQueues(), new BitmapCache());
  166.         ImageLoader.ImageListener listener = imageLoader.getImageListener(image_iamgeLoader, R.mipmap.ic_launcher, R.mipmap.ic_launcher);
  167.         imageLoader.get(IMAGE_URL, listener);
  168.     }
  170.     @Override
  171.     protected void onStop() {
  172.         super.onStop();
  173.         //结束请求
  174.         MyApplication.getQueues().cancelAll("StringRequest_get");
  175.     }
  176. }
  • Volley简单的二次回调封装
  1. public class VolleyRequest {
  2.    public static StringRequest stringRequest;
  3.     public static void RequestGet(Context context,String url,String tag,ResultBack reback){
  4.         MyApplication.getQueues().cancelAll(tag);
  5.         stringRequest=new StringRequest(Request.Method.GET, url,reback.loadingListener(),reback.errorListener());
  6.         stringRequest.setTag(tag);
  7.         MyApplication.getQueues().add(stringRequest);
  8.         MyApplication.getQueues().start();
  9.     }
  10.     public static void RequestPost(Context context, String url,String tag,final Map<String,String> map,ResultBack reback){
  11.         MyApplication.getQueues().cancelAll(tag);
  12.         stringRequest=new StringRequest(Request.Method.GET, url, reback.loadingListener(),reback.errorListener()){
  13.             @Override
  14.             protected Map<String, String> getParams() throws AuthFailureError {
  15.                 return map;
  16.             }
  17.         };
  18.         stringRequest.setTag(tag);
  19.         MyApplication.getQueues().add(stringRequest);
  20.         MyApplication.getQueues().start();
  21.     }
  22. }

自定义的回调接口

  1. public abstract class ResultBack {
  2.     public Context context;
  3.     public static Response.Listener<String> listener;
  4.     public static Response.ErrorListener errorListener;
  6.     public ResultBack(Context context, Response.Listener<String> listener, Response.ErrorListener errorListener) {
  7.         this.context = context;
  8.         this.listener = listener;
  9.         this.errorListener = errorListener;
  10.     }
  12.     public Response.Listener<String> loadingListener() {
  13.         listener = new Response.Listener<String>() {
  14.             @Override
  15.             public void onResponse(String s) {
  16.                 onSuccess(s);
  17.             }
  18.         };
  19.         return listener;
  20.     }
  22.     public Response.ErrorListener errorListener() {
  23.         errorListener = new Response.ErrorListener() {
  24.             @Override
  25.             public void one rrorResponse(VolleyError volleyError) {
  26.                 onFailure(volleyError);
  27.             }
  28.         };
  29.         return errorListener;
  30.     }
  32.     public abstract void onSuccess(String s);
  33.     public abstract void onFailure(VolleyError volleyError);
  34. }
  • 图像缓存类
  1. public class BitmapCache implements ImageLoader.ImageCache {
  2.     public LruCache<String,Bitmap> mBitmapLruCache;
  3.     public int max=1024*1024*10;// 最大缓存10M,超过就会回收
  5.     public BitmapCache(){
  6.         mBitmapLruCache=new LruCache<String,Bitmap>(max){
  7.             @Override
  8.             protected int sizeOf(String key, Bitmap value) {
  9.                 return value.getRowBytes()*value.getHeight();
  10.             }
  11.         };
  12.     }
  14.     @Override
  15.     public Bitmap getBitmap(String s) {
  16.         return mBitmapLruCache.get(s);
  17.     }
  19.     @Override
  20.     public void putBitmap(String s, Bitmap bitmap) {
  21.         mBitmapLruCache.put(s,bitmap);
  22.     }
  23. }


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