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)


    StringRequest request = new StringRequest(Request.Method.GET, REQUEST_URL, new Response.Listener<String>() {
            @Override
            public void onResponse(String s) {//数据请求成功
                result.setText("请求成功:" + s);
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError volleyError) {//数据请求失败
                result.setText("请求失败:" + volleyError.getMessage());
            }
        });

JsonObjectRequest


   JSONObject jsonRequest = new JSONObject();//Get请求传递参数jsonRequest可以为空null
        JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, REQUEST_URL, null, new Response.Listener<JSONObject>() {
            @Override
            public void onResponse(JSONObject jsonObject) {
                result.setText("请求成功:" + jsonObject);
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError volleyError) {
                result.setText("请求失败:" + volleyError.getMessage());
            }
        });

JsonArrayRequest


    JsonArrayRequest request = new JsonArrayRequest(REQUEST_URL, new Response.Listener<JSONArray>() {
            @Override
            public void onResponse(JSONArray jsonArray) {
                result.setText("请求成功:" + jsonArray);
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError volleyError) {
                result.setText("请求失败:" + volleyError.getMessage());
            }
        });

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。


 //创建请求队列
    private static RequestQueue queues;
//初始化请求队列
   queues = Volley.newRequestQueue(getApplicationContext());

建立一个请求并加入队列中。


MyApplication.getQueues().add(request);

取消队列


 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。


   @Override
    protected void onStop() {
        super.onStop();
        //结束请求
        MyApplication.getQueues().cancelAll("StringRequest_get");
    }

Volley调用实例源码展示

demo效果如下

布局文件


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.xhb.app.MainActivity"
    >

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">

            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="center">

                <Button
                    android:id="@+id/_StringRequestGet"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:onClick="StringRequestGet"
                    android:text="StringRequestGet"
                    android:textAllCaps="false"/>

                <Button
                    android:id="@+id/StringRequestPost"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_marginLeft="20dp"
                    android:layout_toRightOf="@id/_StringRequestGet"
                    android:onClick="StringRequestPost"
                    android:text="StringRequestPost"
                    android:textAllCaps="false"/>
            </RelativeLayout>

            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="center">

                <Button
                    android:id="@+id/JsonObjectRequestGet"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:onClick="JsonObjectRequestGet"
                    android:text="JsonObjectRequestGet"
                    android:textAllCaps="false"/>

                <Button
                    android:id="@+id/JsonObjectRequestPost"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_marginLeft="20dp"
                    android:layout_toRightOf="@id/JsonObjectRequestGet"
                    android:onClick="JsonObjectRequestPost"
                    android:text="JsonObjectRequestPost"
                    android:textAllCaps="false"/>
            </RelativeLayout>

            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="center">

                <Button
                    android:id="@+id/JsonArrayRequest"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_alignParentLeft="true"
                    android:layout_alignParentStart="true"
                    android:layout_alignParentTop="true"
                    android:onClick="JsonArrayRequest"
                    android:text="JsonArrayRequest"
                    android:textAllCaps="false"/>
            </RelativeLayout>

            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="center">

                <Button
                    android:id="@+id/MyRequestGet"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:onClick="MyRequestGet"
                    android:text="MyRequestGet"
                    android:textAllCaps="false"/>

                <Button
                    android:id="@+id/MyRequestPost"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_marginLeft="20dp"
                    android:layout_toRightOf="@id/MyRequestGet"
                    android:onClick="MyRequestPost"
                    android:text="MyRequestPost"
                    android:textAllCaps="false"/>
            </RelativeLayout>

            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="center">

                <Button
                    android:id="@+id/ImageRequest"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:onClick="ImageRequest"
                    android:text="ImageRequest"
                    android:textAllCaps="false"/>

                <Button
                    android:id="@+id/ImageLoader"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_marginLeft="20dp"
                    android:layout_toRightOf="@id/ImageRequest"
                    android:onClick="ImageLoader"
                    android:text="ImageLoader"
                    android:textAllCaps="false"/>
            </RelativeLayout>

            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="center">

                <ImageView
                    android:id="@+id/image_imageRequest"
                    android:layout_width="100dp"
                    android:layout_height="100dp"
                    android:src="@mipmap/ic_launcher"
                    android:textAllCaps="false"/>

                <ImageView
                    android:id="@+id/image_iamgeLoader"
                    android:layout_width="100dp"
                    android:layout_height="100dp"
                    android:layout_marginLeft="20dp"
                    android:layout_toRightOf="@id/image_imageRequest"
                    android:src="@mipmap/ic_launcher"
                    android:textAllCaps="false"/>
            </RelativeLayout>

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="20dp"
                android:text="请求结果为:"/>

            <TextView
                android:id="@+id/result"
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_weight="1"/>
        </LinearLayout>
    </ScrollView>
</LinearLayout>

全局初始化文件


public class MyApplication extends Application {
    //创建请求队列
    private static RequestQueue queues;
    @Override
    public void onCreate() {
        super.onCreate();
        //初始书请求队列
        queues = Volley.newRequestQueue(getApplicationContext());
    }
    public static RequestQueue getQueues() {
        return queues;
    }
}

主要实现文件


public class MainActivity extends AppCompatActivity {

    public static final String BASE = "http://op.juhe.cn/onebox/weather/query";
    public static final String REQUEST_URL = BASE + "?cityname=%E5%8D%81%E5%A0%B0&key=634f562a2b3900e051c6af6e2dc3017e";
    public static final String IMAGE_URL = "https://pic.cnblogs.com/avatar/789527/20160825180355.png";
    private TextView result;
    private ImageView image_imageRequest, image_iamgeLoader;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        result = (TextView) findViewById(R.id.result);
        image_imageRequest = (ImageView) findViewById(R.id.image_imageRequest);
        image_iamgeLoader = (ImageView) findViewById(R.id.image_iamgeLoader);
    }

    public void StringRequestGet(View view) {
        //StringRequest
        StringRequest request = new StringRequest(Request.Method.GET, REQUEST_URL, new Response.Listener<String>() {
            @Override
            public void onResponse(String s) {//数据请求成功
                result.setText("请求成功:" + s);
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError volleyError) {//数据请求失败
                result.setText("请求失败:" + volleyError.getMessage());
            }
        });
        request.setTag("StringRequest_get");
        MyApplication.getQueues().add(request);
    }


    public void StringRequestPost(View view) {
        //StringRequest
        StringRequest request = new StringRequest(Request.Method.POST, BASE, new Response.Listener<String>() {
            @Override
            public void onResponse(String s) {//数据请求成功
                result.setText("请求成功:" + s);
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError volleyError) {//数据请求失败
                result.setText("请求失败:" + volleyError.getMessage());
            }
        }) {
            @Override//传递参数
            protected Map<String, String> getParams() throws AuthFailureError {
                Map<String, String> map = new HashMap<>();
                map.put("key", "634f562a2b3900e051c6af6e2dc3017e");
                map.put("cityname", "十堰");
                return map;
            }
        };
        request.setTag("StringRequestPost");
        MyApplication.getQueues().add(request);
    }

    public void JsonObjectRequestGet(View view) {
        //JsonObjectRequest
        JSONObject jsonRequest = new JSONObject();//Get请求传递参数jsonRequest可以为空null
        JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, REQUEST_URL, null, new Response.Listener<JSONObject>() {
            @Override
            public void onResponse(JSONObject jsonObject) {
                result.setText("请求成功:" + jsonObject);
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError volleyError) {
                result.setText("请求失败:" + volleyError.getMessage());
            }
        });
        request.setTag("JsonObjectRequestGet");
        MyApplication.getQueues().add(request);
    }

    public void JsonObjectRequestPost(View view) {
        Map<String, String> map = new HashMap<>();
        map.put("key", "634f562a2b3900e051c6af6e2dc3017e");
        map.put("cityname", "十堰");
        JSONObject jsonRequest = new JSONObject(map);
        JsonObjectRequest request = new JsonObjectRequest(Request.Method.POST, BASE, jsonRequest, new Response.Listener<JSONObject>() {
            @Override
            public void onResponse(JSONObject jsonObject) {
                result.setText("请求成功:" + jsonObject.toString());
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError volleyError) {
                result.setText("请求失败:" + volleyError.getMessage());
            }
        });
        request.setTag("JsonObjectRequestPost");
        MyApplication.getQueues().add(request);
    }

    public void JsonArrayRequest(View view) {
        JsonArrayRequest request = new JsonArrayRequest(REQUEST_URL, new Response.Listener<JSONArray>() {
            @Override
            public void onResponse(JSONArray jsonArray) {
                result.setText("请求成功:" + jsonArray);
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError volleyError) {
                result.setText("请求失败:" + volleyError.getMessage());
            }
        });
        request.setTag("JsonArrayRequest");
        MyApplication.getQueues().add(request);
    }

    public void MyRequestGet(View view) {
        new VolleyRequest().RequestGet(this, REQUEST_URL, "MyRequestGet", new ResultBack(this, ResultBack.listener, ResultBack.errorListener) {
            @Override
            public void onSuccess(String s) {
                result.setText("请求成功:" + s);
            }

            @Override
            public void onFailure(VolleyError volleyError) {
                result.setText("请求失败:" + volleyError.getMessage());
            }
        });
    }

    public void MyRequestPost(View view) {
        Map<String, String> map = new HashMap<>();
        map.put("key", "634f562a2b3900e051c6af6e2dc3017e");
        map.put("cityname", "十堰");
        new VolleyRequest().RequestPost(this, REQUEST_URL, "MyRequestPost", map, new ResultBack(this, ResultBack.listener, ResultBack.errorListener) {
            @Override
            public void onSuccess(String s) {
                result.setText("请求成功:" + s);
            }

            @Override
            public void onFailure(VolleyError volleyError) {
                result.setText("请求失败:" + volleyError.getMessage());
            }
        });
    }

    //ImageRequest方式加载图片
    public void ImageRequest(View view) {
        ImageRequest request = new ImageRequest(IMAGE_URL, new Response.Listener<Bitmap>() {
            @Override
            public void onResponse(Bitmap bitmap) {//加载成功
                image_imageRequest.setImageBitmap(bitmap);
            }
        }, 0, 0, Bitmap.Config.RGB_565, new Response.ErrorListener() {//加载失败
            @Override
            public void onErrorResponse(VolleyError volleyError) {
                image_imageRequest.setImageResource(R.mipmap.ic_launcher);
            }
        });
        request.setTag("ImageRequest");
        MyApplication.getQueues().add(request);
    }

    //ImageLoader加载图片
    public void ImageLoader(View view) {
        ImageLoader imageLoader = new ImageLoader(MyApplication.getQueues(), new BitmapCache());
        ImageLoader.ImageListener listener = imageLoader.getImageListener(image_iamgeLoader, R.mipmap.ic_launcher, R.mipmap.ic_launcher);
        imageLoader.get(IMAGE_URL, listener);
    }

    @Override
    protected void onStop() {
        super.onStop();
        //结束请求
        MyApplication.getQueues().cancelAll("StringRequest_get");
    }
}

Volley简单的二次回调封装


public class VolleyRequest {
   public static StringRequest stringRequest;
    public static void RequestGet(Context context,String url,String tag,ResultBack reback){
        MyApplication.getQueues().cancelAll(tag);
        stringRequest=new StringRequest(Request.Method.GET, url,reback.loadingListener(),reback.errorListener());
        stringRequest.setTag(tag);
        MyApplication.getQueues().add(stringRequest);
        MyApplication.getQueues().start();
    }
    public static void RequestPost(Context context, String url,String tag,final Map<String,String> map,ResultBack reback){
        MyApplication.getQueues().cancelAll(tag);
        stringRequest=new StringRequest(Request.Method.GET, url, reback.loadingListener(),reback.errorListener()){
            @Override
            protected Map<String, String> getParams() throws AuthFailureError {
                return map;
            }
        };
        stringRequest.setTag(tag);
        MyApplication.getQueues().add(stringRequest);
        MyApplication.getQueues().start();
    }
}

自定义的回调接口


public abstract class ResultBack {
    public Context context;
    public static Response.Listener<String> listener;
    public static Response.ErrorListener errorListener;

    public ResultBack(Context context, Response.Listener<String> listener, Response.ErrorListener errorListener) {
        this.context = context;
        this.listener = listener;
        this.errorListener = errorListener;
    }

    public Response.Listener<String> loadingListener() {
        listener = new Response.Listener<String>() {
            @Override
            public void onResponse(String s) {
                onSuccess(s);
            }
        };
        return listener;
    }

    public Response.ErrorListener errorListener() {
        errorListener = new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError volleyError) {
                onFailure(volleyError);
            }
        };
        return errorListener;
    }

    public abstract void onSuccess(String s);
    public abstract void onFailure(VolleyError volleyError);
}

图像缓存类


public class BitmapCache implements ImageLoader.ImageCache {
    public LruCache<String,Bitmap> mBitmapLruCache;
    public int max=1024*1024*10;// 最大缓存10M,超过就会回收

    public BitmapCache(){
        mBitmapLruCache=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 mBitmapLruCache.get(s);
    }

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

来自为知笔记(Wiz)

时间： 2024-10-14 13:04:51

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