原 Volley框架之网络请求和图片加载

Posted 2020-08-22 切切歆语

Volley是 Google 推出的 android 异步网络请求框架和图片加载框架。

Volley的特性

(1).封装了的异步的请求API。Volley 中大多是基于接口的设计，可配置性强。
(2).一个优雅和稳健的请求队列，一定程度符合 Http 规范，包括请求头的处理，缓存机制的支持等。
(3).自定义的网络图像加载视图（NetworkImageView，ImageLoader等) 。
(4). 提供简便的图片加载工具。

本案例包含get，post请求和几种网络图片加载的方式，效果如图：

      

辅助类 ApplicationController.java

/**
 * 
 * 
 * 使用请求队列
 * Volley的所有请求都放在一个队列，然后进行处理，这里是你如何将创建一个请求队列
 * @author Administrator
 *
 */
public class ApplicationController extends Application {
    
     public static RequestQueue queue;

        @Override
        public void onCreate() {
            super.onCreate();
            queue = Volley.newRequestQueue(getApplicationContext());//使用全局上下文
        }

        public static RequestQueue getHttpQueue() {
            return queue;
        } 

}

/****
 * 
 * Volley之网络请求
 * 
 * 包含两种  get 和   post 请求方式
 * 
 * @author Administrator
 * 
 */
public class VolleyRequest extends Activity implements OnClickListener {

    private RequestQueue mQueue;
    TextView mTextView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_http);
        mQueue = ApplicationController.queue;// Volley.newRequestQueue(this);
        VolleyUtil.initialize(VolleyRequest.this);
        initView();

    }

    private void initView() {
        // TODO Auto-generated method stub
        findViewById(R.id.get).setOnClickListener(this);
        findViewById(R.id.post).setOnClickListener(this);
        findViewById(R.id.get1).setOnClickListener(this);
        findViewById(R.id.post1).setOnClickListener(this);
        mTextView = (TextView) findViewById(R.id.textView1);

    }

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        switch (v.getId()) {
        case R.id.get:
            get();
            break;
        case R.id.get1:
            get1();
            break;
        case R.id.post:
            post();
            break;
        case R.id.post1:
            post1();
            break;
        default:
            break;
        }

    }

    private void get() {
        // 列如
        String url = "https://www.baidu.com";
        mQueue.add(new StringRequest(Method.GET, url, new Listener<String>() {
            @Override
            public void onResponse(String arg0) {
                mTextView
                        .setText("------------------------------------get1-----------------------------------------   \n\n"
                                + arg0);
            }
        }, new ErrorListener() {

            @Override
            public void onErrorResponse(VolleyError arg0) {
                Toast.makeText(VolleyRequest.this, "Get请求失败", 2).show();
            }

        }));

    }

    private void get1() {

        String url = "https://www.baidu.com";
        StringRequest request = new StringRequest(Request.Method.GET, url,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String s) {
                        mTextView
                                .setText("------------------------------------get2-----------------------------------------   \n\n"
                                        + s);
                    }
                }, new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError volleyError) {
                        Toast.makeText(VolleyRequest.this, "Get请求失败", 2).show();
                    }
                });
        // 设置取消取消http请求标签 Activity的生命周期中的onStiop()中调用
        request.setTag("volleyget");
        ApplicationController.getHttpQueue().add(request);

    }

    public void post() {
        RequestQueue requestQueue = Volley.newRequestQueue(VolleyRequest.this);
        StringRequest stringRequest = new StringRequest(Request.Method.POST,
                "https://route.showapi.com/32-9",
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        mTextView
                                .setText("------------------------------------post1-----------------------------------------   \n\n"
                                        + response);
                    }
                }, new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        Toast.makeText(VolleyRequest.this, "请求失败", 2).show();
                    }
                }) {
            @Override
            protected Map<String, String> getParams() {
                // 在这里设置需要post的参数

                return showMap();
            }
        };
        requestQueue.add(stringRequest);
    }

    public void post1() {
        RequestQueue requestQueue = ApplicationController.getHttpQueue();
        Request<JSONObject> request = new NormalPostRequest(
                "https://route.showapi.com/32-9",
                new Response.Listener<JSONObject>() {
                    @Override
                    public void onResponse(JSONObject response) {
                        mTextView
                                .setText("------------------------------------post2---------------------------------------   \n\n"
                                        + response.toString());
                    }
                }, new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        Toast.makeText(VolleyRequest.this, "请求失败", 2).show();
                    }
                }, showMap());
        requestQueue.add(request);
    }

    /***
     * 
     * 接口POST参数
     * 
     * @return Map
     */

    private Map<String, String> showMap() {
        Map<String, String> map = new HashMap<String, String>();
        map.put("q", "test");
        map.put("showapi_appid", "11548");
        map.put("showapi_timestamp", "20160511115654");
        map.put("showapi_sign", "bb1d15ab7ce646ec87cc89d684ca4bcb");
        return map;
    }

    @Override
    protected void onStop() {
        super.onStop();
        ApplicationController.getHttpQueue().cancelAll("volleyget"); // 结束Activity时队列里面注销
         mQueue.cancelAll(this);  //取消这个队列里的所有请求：
    }

}

图片加载：

/****
 * 
 * Volley之图片加载
 * 
 * @author Administrator
 *
 */
public class VolleyImg extends Activity implements OnClickListener {

    ImageView imageview1,imageview2;
    NetworkImageView mNetworkImageView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_img);
        initView();

    }

    private void initView() {
        // TODO Auto-generated method stub
        findViewById(R.id.btn1).setOnClickListener(this);
        findViewById(R.id.btn2).setOnClickListener(this);
        findViewById(R.id.btn3).setOnClickListener(this);
        imageview1 = (ImageView) findViewById(R.id.img1);
        imageview2 = (ImageView) findViewById(R.id.img2);
        mNetworkImageView = (NetworkImageView) findViewById(R.id.networkImageView);

    }

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        switch (v.getId()) {
        case R.id.btn1:
            img1();
            break;
        case R.id.btn2:
            img2();
            break;
        case R.id.btn3:
            img3();
            break;
        default:
            break;
        }

    }

    private void img1() {
        ImageRequest request = new ImageRequest("http://img.my.csdn.net/uploads/201407/26/1406383299_1976.jpg",
                new Response.Listener<Bitmap>() {
                    @Override
                    public void onResponse(Bitmap bitmap) {
                        imageview1.setImageBitmap(bitmap);
                    }
                }, 0, 0, Config.RGB_565,
                new Response.ErrorListener() {
                    public void onErrorResponse(VolleyError error) {
                        imageview1.setImageResource(R.drawable.ic_launcher);
                    }
                });
                VolleySingleton.getVolleySingleton(this.getApplicationContext()).addToRequestQueue(request);

    }

    public void img2() {
        com.android.volley.toolbox.ImageLoader mImageLoader;
        mImageLoader = VolleySingleton.getVolleySingleton(this.getApplicationContext()).getImageLoader();
        //IMAGE_URL是图片网络地址
        //mImageView是ImageView实例
        //R.drawable.def_image默认图片id
        //R.drawable.err_image加载图片错误时的图片
        mImageLoader.get("http://hiphotos.baidu.com/baidu/pic/item/63d0f703918fa0ec2ebf584b269759ee3d6ddb7f.jpg", 
        com.android.volley.toolbox.ImageLoader.getImageListener(imageview2,R.drawable.ic_launcher, R.drawable.ic_launcher));
    }


    /**
     * 使用NetworkImageView加载图片
     */
    public void img3()
    {
        com.android.volley.toolbox.ImageLoader mImageLoader;
        mImageLoader = VolleySingleton.getVolleySingleton(this.getApplicationContext()).getImageLoader();
        mNetworkImageView.setImageUrl("http://hiphotos.baidu.com/baidu/pic/item/f603918fa0ec08fabf7a641659ee3d6d55fbda0d.jpg", mImageLoader);
    }    

}

记得AndroidManifest.xml 中加

<uses-permission android:name="android.permission.INTERNET"/>
  <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
  <application android:name="util.ApplicationController">

由于代码太多，布局文件未给出，要源码直接下载即可

源码下载：

 

Eclipse下载：http://download.csdn.net/detail/dickyqie/9631961

AndroidStudio下载：https://github.com/DickyQie/Volley