Volley, volley framework

Volley, volley framework

INetwork request

1. get request data

// 1 create a request queue RequestQueue requestQueue = Volley. newRequestQueue (VolleyActivity. this); // 2 create a request String url = "http://api.m.mtime.cn/PageSubArea/TrailerList.api"; StringRequest stringRequest = new StringRequest (url, new Response. listener <String> () {// receives the correct data callback @ Overridepublic void onResponse (String s) {TV _volley_result.setText (s) ;}, new Response. errorListener () {// listener callback after an exception @ Overridepublic void onErrorResponse (VolleyError volleyError) {TV _volley_result.setText ("loading failed" + volleyError );}}); // 3 Add the created request to requestQueue in the Request queue. add (stringRequest );

　　

2. post request data

// 1 create a request queue RequestQueue requestQueue = Volley. newRequestQueue (VolleyActivity. this); // 2 create a post Request String url = "http://api.m.mtime.cn/PageSubArea/TrailerList.api"; StringRequest stringRequest = new StringRequest (Request. method. POST, url, new Response. listener <String> () {@ Overridepublic void onResponse (String s) {TV _volley_result.setText (s) ;}}, new Response. errorListener () {@ Overridepublic void onErrorResponse (VolleyError volleyError) {response ("request failed" + volleyError) ;}}) {@ Overrideprotected Map <String, String> getParams () throws AuthFailureError {Map <String, String> map = new HashMap <String, String> (); // map. put ("value1", "param1"); return map ;}}; // 3 Add the post request to the queue requestQueue. add (stringRequest );

　　

3. Request Json data

// 1 create a request queue RequestQueue requestQueue = Volley. newRequestQueue (VolleyActivity. this); // 2 create a request String url = "http://api.m.mtime.cn/PageSubArea/TrailerList.api"; JsonObjectRequest jsonObjectRequest = new JsonObjectRequest (url, null, new Response. listener <JSONObject> () {@ Overridepublic void onResponse (JSONObject jsonObject) {TV _volley_result.setText (jsonObject. toString () ;}}, new Response. errorListener () {@ Overridepublic void onErrorResponse (VolleyError volleyError) {TV _volley_result.setText ("request failed" + volleyError );}}); // 3 Add the created request to requestQueue in the Request queue. add (jsonObjectRequest );

　　

 

2. image loading

1. ImageRequest

// 1 create a request queue RequestQueue requestQueue = Volley. newRequestQueue (VolleyActivity. this); // 2 the request for creating an image String url = "http://img5.mtime.cn/mg/2016/10/11/160347.30270341.jpg"; ImageRequest imageRequest = new ImageRequest (url, new Response. listener <Bitmap> () {@ Overridepublic void onResponse (Bitmap bitmap) {// The image iv_volley_result.setImageBitmap (bitmap) ;}, 0, 0, Bitmap. config. RGB_565, new Response. errorListener () {@ Overridepublic void onErrorResponse (VolleyError volleyError) {iv_volley_result.setImageResource (R. drawable. atguigu_logo) ;}}); // 3 Add the request to requestQueue in the Request queue. add (imageRequest );

　　

2. Imageloader loads Images

// Create a request queue RequestQueue requestQueue = Volley. newRequestQueue (VolleyActivity. this); ImageLoader imageLoader = new ImageLoader (requestQueue, new BitmapCache (); // load image String url = "http://img5.mtime.cn/mg/2016/10/11/160347.30270341.jpg"; ImageLoader. imageListener imageListener = imageLoader. getImageListener (iv_volley_result, R. drawable. atguigu_logo, R. drawable. atguigu_logo); imageLoader. get (url, imageListener );

　　

BitmapCache. java

 1 public class BitmapCache implements ImageLoader.ImageCache { 2     private LruCache<String, Bitmap> mCache; 3  4     public BitmapCache() { 5         int maxSize = 10 * 1024 * 1024;// 10m 6         mCache = new LruCache<String, Bitmap>(maxSize) { 7             @Override 8             protected int sizeOf(String key, Bitmap bitmap) { 9                 return bitmap.getRowBytes() * bitmap.getHeight();10             }11         };12     }13 14     @Override15     public Bitmap getBitmap(String url) {16         return mCache.get(url);17     }18 19     @Override20     public void putBitmap(String url, Bitmap bitmap) {21         mCache.put(url, bitmap);22     }23 }

BitmapCache

 

3. NetworkImageView

<com.android.volley.toolbox.NetworkImageViewandroid:id="@+id/iv_volley_networkimagview"android:layout_width="200dp"android:layout_height="200dp"android:visibility="gone"></com.android.volley.toolbox.NetworkImageView>

 

// Create a request queue RequestQueue requestQueue = Volley. newRequestQueue (VolleyActivity. this); // create an ImageloaderImageLoader imageLoader = new ImageLoader (requestQueue, new BitmapCache (); // set iv_volley_networkimagview.setDefaultImageResId (R. drawable. atguigu_logo); iv_volley_networkimagview.setErrorImageResId (R. drawable. atguigu_logo); // load the image String url = "http://img5.mtime.cn/mg/2016/10/11/160347.30270341.jpg"; iv_volley_networkimagview.setImageUrl (url, imageLoader );