09_android Introduction _ Use Android-async-http Open source project Get mode or POST method to achieve the landing case

based on the introduction of 08_android _android-async-http Open source project and its usage , we introduce the most common landing cases android-async-http The use of classes in open source projects. Hope to learn from you android-async-http Open source projects are helpful.

1 continue to use 03_android to implement the login interface for this case layout file with Relativelayout

2.server end of the code with the 04_android introduction _ HttpURLConnection Get way to implement the landing case of the server code snippet (5. About server I write only one servlet to handle the corresponding request processing)

3. In the application cite android-async-http open source project

Method One: find the source code of the downloaded file Library\src\main\java com package paste into the project under the src folder

Method Two: Put android-async-http-master\releases below the newest JAr package to apply to Libs

4.loginactivity Code (in the code specifically added gaze, please read carefully)

Package Com.example.lesson03;import Org.apache.http.header;import Com.loopj.android.http.asynchttpclient;import Com.loopj.android.http.asynchttpresponsehandler;import Com.loopj.android.http.requestparams;import Android.app.activity;import Android.os.bundle;import Android.text.textutils;import Android.view.View;import Android.widget.edittext;import Android.widget.textview;import Android.widget.toast;public class LoginActivity Extends Activity {//DECLARE control private EditText et_name, et_pass;private TextView tv_result; @Overrideprotected void OnCreate ( Bundle savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (r.layout.activity_main);//Get Control object et _name = (EditText) Findviewbyid (r.id.et_name); et_pass = (EditText) Findviewbyid (r.id.et_pass); tv_result = (TextView) Findviewbyid (R.id.tv_result);}  /** * Click the event triggered by the button control * @param v */public void login (View v) {//Get control's Idint id = v.getid ();//The corresponding processing by ID inference switch (ID) {case r.id.btn_login://gets the text content of the control string userName = Et_name.gettext (). TostriNg ();//Usernamestring Userpass = Et_pass.gettext (). toString ();//user password//infers if username and password are empty if ( Textutils.isempty (Username.trim ()) | | Textutils.isempty (Userpass.trim ())) {Toast.maketext (this, "username or password cannot be empty", Toast.length_long). Show (); else {//Send request to server//call: Loginbyasynchttpclientpost (UserName, Userpass); Loginbyasynchttpclientget (UserName, Userpass);} Break;}} /** * Implemented with Asynchttpclient POST method * @param userName * @param userpass */public void Loginbyasynchttpclientpost (String use Rname, String userpass) {asynchttpclient client = new Asynchttpclient ();//Create an asynchronous request for the clients object String url = "http://172.16.237.20 0:8080/video/login.do "; Define the requested address//create request for the encapsulated object Requestparams params = new Requestparams ();p arams.put ("username", username); Set the requested parameter name and the number of Params.put ("Userpass", userpass);//Set the requested name and reference//Run Post method client.post (URL, params, new  Asynchttpresponsehandler () {/** * method successfully processed * StatusCode: The status code of the response; headers: The corresponding header information, for example, response time, response of the server; * Responsebody: bytes of response content */@Overridepublic void onSuccess (int statusCode, header[] headers,byte[] responsebody) {if (StatusCode = =) {Tv_result.settext (New String ( Responsebody)); Set the displayed text}}/** * Method of failure Handling * ERROR: Response failure message encapsulated in this exception object */@Overridepublic void onfailure (int statusCode, header[] Headers,b Yte[] responsebody, throwable error) {error.printstacktrace ();//The wrong print information out of the path}}); /** * Implemented with Asynchttpclient get method * @param userName * @param userpass */public void Loginbyasynchttpclientget (String UserN Ame, String userpass) {//Create asynchronous Client Object asynchttpclient = new Asynchttpclient ();//request address String URL = "http://172.16.237 .200:8080/video/login.do ";//create the encapsulated object of the request parameter requestparams params = new Requestparams ();p arams.put (" username ", username) ; Set the requested parameter name and the number of Params.put ("Userpass", userpass);//Set the requested name and the number of parameters//When sending a GET request, the URL address corresponding to the parameter, the anonymous callback object Client.get (URL, params, New Asynchttpresponsehandler () {@Overridepublic void onsuccess (int statusCode, header[] headers,byte[] responsebody) {/ /Successful processing Method System.out.println ("StatusCode-------------------" + STATUSCODE);//Traverse header information for (int i = 0; i < headers.length; i++) {Header header = Headers[i]; System.out.println ("header------------Name:" + header.getname () + ",--Value:" + header.getvalue ());} Sets the control content Tv_result.settext (new String (Responsebody));} @Overridepublic void onfailure (int statusCode, header[] headers,byte[] responsebody, throwable error) {// Method of failure handling Error.printstacktrace ();}});}}

5. Program execution results such as:

09_android Introduction _ Use Android-async-http Open source project Get mode or POST method to achieve the landing case