Volley的使用

Bertha 。 2022-07-15 00:13 198阅读 0赞

package com.example.cuboo.myvolley;
    
    import android.graphics.Bitmap;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.util.LruCache;
    import android.widget.ImageView;
    import android.widget.TextView;
    
    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.JsonObjectRequest;
    import com.android.volley.toolbox.NetworkImageView;
    import com.android.volley.toolbox.Volley;
    
    import org.json.JSONObject;
    /*
     * Volley is Android Internet Communication Library with faster，more simple and robust。
     * Volley Function：
     * 1、JSON，Pictures（AsyncTask）
     * 2、Sort of The Internet request
     * 3、Solved Priorities of Internet request
     * 4、Cache
     * 5、Cancel request of Levels
     * 6、与Activity的生命周期联动
     *
     * 获取Volley
     */
    
    public class MainActivity extends AppCompatActivity {
        TextView tv;
        ImageView img;
        NetworkImageView net_img;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            init();
            getJSONVolley();
            loadImageVolley();
            loadnetImageVolley();
        }
        private void init(){
            tv = (TextView) findViewById(R.id.tv);
            img = (ImageView) findViewById(R.id.img);
            net_img = (NetworkImageView) findViewById(R.id.net_img);
        }
    
        //获取JSON数据
        private void getJSONVolley(){
            RequestQueue requestQueue = Volley.newRequestQueue(this);
            String JSONDataUrl = "http://www.cnblogs.com/shyy/archive/2012/04/05/2453031.html";
            JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.GET, JSONDataUrl, null,
                    new Response.Listener<JSONObject>() {
                        @Override
                        public void onResponse(JSONObject jsonObject) {
                            System.out.println("response" + jsonObject);
                            tv.setText("response" + jsonObject);
                        }
                    },
                    new Response.ErrorListener() {
                        @Override
                        public void onErrorResponse(VolleyError volleyError) {
                            System.out.println("Sorry There is a problem");
                            tv.setText("有问题！");
                        }
                    });
            requestQueue.add(jsonObjectRequest);
        }
    
        private void loadImageVolley(){
            String ImageUrl = "http://s9.sinaimg.cn/middle/002nMbZlzy6NEH8BQRa28&690";
            RequestQueue requestQueue = Volley.newRequestQueue(this);
            final LruCache<String,Bitmap> lruCache = new LruCache<String,Bitmap>(20);
            ImageLoader.ImageCache imageCache = new ImageLoader.ImageCache() {
                @Override
                public Bitmap getBitmap(String s) {
                    return lruCache.get(s);
                }
    
                @Override
                public void putBitmap(String s, Bitmap bitmap) {
                    lruCache.put(s,bitmap);
                }
            };
            ImageLoader imageLoader = new ImageLoader(requestQueue,imageCache);
            ImageLoader.ImageListener listener = ImageLoader.getImageListener(img,R.mipmap.ic_launcher,R.mipmap.ic_launcher);
            imageLoader.get(ImageUrl,listener);
        }
        private void loadnetImageVolley(){
            String ImageUrl = "http://image.tianjimedia.com/uploadImages/2012/004/6481LRQE84D2.jpg";
            RequestQueue requestQueue = Volley.newRequestQueue(this);
            final LruCache<String,Bitmap> lruCache = new LruCache<String,Bitmap>(20);
            ImageLoader.ImageCache imageCache = new ImageLoader.ImageCache() {
                @Override
                public Bitmap getBitmap(String s) {
                    return lruCache.get(s);
                }
    
                @Override
                public void putBitmap(String s, Bitmap bitmap) {
                    lruCache.put(s,bitmap);
                }
            };
            ImageLoader imageLoader = new ImageLoader(requestQueue,imageCache);
            net_img.setTag("url");
            net_img.setImageUrl(ImageUrl,imageLoader);
        }
    }