Android uses Volley to load data asynchronously. Complete example (1)

MainActivity is as follows:

Package cc.cn; import java. util. hashMap; import org. json. JSONObject; import android. app. activity; import android. content. context; import android. OS. bundle; import com. android. volley. authFailureError; import com. android. volley. requestQueue; import com. android. volley. response; import com. android. volley. volleyError; import com. android. volley. request. method; import com. android. volley. toolbox. jsonObjectRequest; import com. android. volley. toolbox. stringRequest; import com. android. volley. toolbox. volley;/*** Demo Description: * a simple use of Volley in a project last year, see: * http://blog.csdn.net/lfdfhl/article/details/12223345 * recently guolin wrote several articles detailing Volley, so here we will learn more systematically. * In this example, it mainly includes: * 1 using Volley to implement Get requests * 2 using Volley to implement Post requests * 3 using Volley to implement Json data requests ** note: * 1 introduce the jar package volley. jar * 2 network Permissions
 ** Learning materials: * http://blog.csdn.net/guolin_blog/article/details/17482095 * Thank you very much **/public class MainActivity extends Activity {private RequestQueue mRequestQueue; private StringRequest mStringRequest; private Context mContext; private JsonObjectRequest mJsonObjectRequest; @ Override public void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. main); volley_get (); // volley_post (); // volley_json ();} // use Volley to implement the private void volley_get () {mContext = this; string url = "http://www.baidu.com/"; // 1 create the RequestQueue object mRequestQueue = Volley. newRequestQueue (mContext); // 2 create the StringRequest object mStringRequest = new StringRequest (url, new Response. listener
 
  
() {@ Overridepublic void onResponse (String response) {System. out. println ("request Result:" + response) ;}, new Response. errorListener () {@ Overridepublic void onErrorResponse (VolleyError error) {System. out. println ("request error:" + error. toString () ;}}); // 3 add StringRequest to RequestQueuemRequestQueue. add (mStringRequest);} // use Volley to implement Post request private void volley_post () {String url = "http://hxyj.cwwic.cn/wap/api_cs/user.p Hp? Action = login "; mContext = this; mRequestQueue = Volley. newRequestQueue (mContext); mStringRequest = new StringRequest (Method. POST, url, new Response. Listener
  
   
() {@ Overridepublic void onResponse (String response) {System. out. println ("request Result:" + response) ;}, new Response. errorListener () {@ Overridepublic void onErrorResponse (VolleyError error) {System. out. println ("request error:" + error. toString () ;}}) {// carry the parameter @ Overrideprotected HashMap
   
    
GetParams () throws AuthFailureError {HashMap
    
     
HashMap = new HashMap
     
      
(); HashMap. put ("un", "411111222"); hashMap. put ("pw", "180034111"); return hashMap ;}}; mRequestQueue. add (mStringRequest);} // use Volley to implement a Json data request private void volley_json () {mContext = this; String url = "http://m.weather.com.cn/data/101010100.html "; // 1 create the RequestQueue object mRequestQueue = Volley. newRequestQueue (mContext); // 2 create the JsonObjectRequest object mJsonObjectRequest = new JsonObjectRequest (url, null, new Response. listener
      
        () {@ Overridepublic void onResponse (JSONObject response) {System. out. println ("request Result:" + response. toString () ;}}, new Response. errorListener () {@ Overridepublic void onErrorResponse (VolleyError error) {System. out. println ("request error:" + error. toString () ;}}); // 3 add JsonObjectRequest to RequestQueuemRequestQueue. add (mJsonObjectRequest );}}
      
     
    
   
  
 

Main. xml is as follows: