Volley基本使用

Posted 2020-08-10 小阿仙的fans

ImageLoader异步加载图片

 1 /**
 2      * 异步加载图片
 3      */
 4     private void loadImageByVolley(){  
 5         String imageUrl="http://www.taopic.com/uploads/allimg/120421/107063-12042114025737.jpg";  
 6         RequestQueue requestQueue = Volley.newRequestQueue(this);
 7         
 8         final LruCache<String, Bitmap> lruCache = new LruCache<String, Bitmap>(20);  
 9         ImageCache imageCache = new ImageCache() { 
10             
11             @Override  
12             public void putBitmap(String key, Bitmap value) {  
13                 lruCache.put(key, value);  
14             }  
15   
16             @Override  
17             public Bitmap getBitmap(String key) {  
18                 return lruCache.get(key);  
19             }  
20         };  
21         ImageLoader imageLoader = new ImageLoader(requestQueue, imageCache); 
22         
23         //三个参数分别是imageView组件，默认图片，加载失败图片
24         ImageListener listener = ImageLoader.getImageListener(iv, R.drawable.ic_launcher,0);  
25         imageLoader.get(imageUrl, listener);  
26     } 

View Code

NetworkImageView显示网络图片

 1 /**
 2      * 使用NetworkImageView显示网络图片,代替传统的ImageView
 3      */
 4     private void showImageByNetworkImageView(){  
 5         String imageUrl="http://avatar.csdn.net/6/6/D/1_lfdfhl.jpg";  
 6         RequestQueue requestQueue = Volley.newRequestQueue(this);  
 7         final LruCache<String, Bitmap> lruCache = new LruCache<String, Bitmap>(20);  
 8         ImageCache imageCache = new ImageCache() {  
 9             @Override  
10             public void putBitmap(String key, Bitmap value) {  
11                 lruCache.put(key, value);  
12             }  
13   
14             @Override  
15             public Bitmap getBitmap(String key) {  
16                 return lruCache.get(key);  
17             }  
18         };  
19         ImageLoader imageLoader = new ImageLoader(requestQueue, imageCache);   
20         mNetworkImageView.setImageUrl(imageUrl,imageLoader);  
21     }  

View Code

 处理get请求

 1 public class Weather {
 2 
 3     @SerializedName("code")
 4     private String code;
 5 
 6     @SerializedName("list")
 7     private WeatherList list;
 8     
 9     @SerializedName("day")
10     private String[] day;
11     
12 
13     public WeatherList getList() {
14         return list;
15     }
16 
17     public void setList(WeatherList list) {
18         this.list = list;
19     }
20 
21     public String getCode() {
22         return code;
23     }
24 
25     public void setCode(String code) {
26         this.code = code;
27     }
28 
29     public String[] getDay() {
30         return day;
31     }
32 
33     public void setDay(String[] day) {
34         this.day = day;
35     }
36     
37     
38     
39 }

实体类

 1 public class Test extends Activity {
 2     private String url = "http://api.izhuzhou.com.cn/GetMoreWeather.ashx";
 3     private TextView tv;
 4 
 5     @Override
 6     protected void onCreate(Bundle savedInstanceState) {
 7         super.onCreate(savedInstanceState);
 8         setContentView(R.layout.test);
 9         
10         tv = (TextView) findViewById(R.id.text);
11 
12         RequestQueue mQueue = Volley.newRequestQueue(this);
13         mQueue.add(new JsonObjectRequest(Method.GET, url, null, new Listener<JSONObject>() {
14             public void onResponse(JSONObject response) {
15                  Gson gson = new Gson();
16                  Weather weather = gson.fromJson(response.toString(), Weather.class);
17                  weather.getCode();
18                  weather.getList().getUpdateTime();
19                               
20                  tv.setText(weather.getDay()[0]);
21 
22             }
23 
24         }, null));
25         mQueue.start();
26 
27     }
28 
29 }

get请求处理