Android+php using HttpClient to submit a POST request, use JSON to parse the response

here's how to get your Android app to have networking capabilities. Of course, the first to have a server, if only for testing, you can use the local area network instead (mobile phone and computer WiFi).

Requires that the computer is configured with Apache+php environment.

Here is a simple Android program, I believe that as long as there is a certain Java foundation can probably "guess" the meaning of it. (The program may not be well written)

Android Program

Layout file

     
  
   Gravity= "Center" android:text= "parse with JSON" android:textsize= "30SP"/>
   
     
    gravity= "center" > 
      
                      
     

       
   
    
    gravity= "center" > 
      
                     
     

           
   
  
 

Main Activity. Java

Package Com.example.jsontest;import Java.io.bufferedreader;import Java.io.inputstream;import Java.io.inputstreamreader;import java.util.arraylist;import java.util.list;import org.Apache. http. httpentity;import org.Apache. http. httpresponse;import org.Apache. http. namevaluepair;import org.Apache. http.client.httpclient;import org.Apache. http.client.entity.urlencodedformentity;import org.Apache. http.client.methods.httppost;import org.Apache. http.impl.client.defaulthttpclient;import org.Apache. http.message.basicnamevaluepair;import org.Apache. Http.protocol.http;import Org.json.jsonarray;import Org.json.jsonobject;import Android.os.Bundle;import Android.os.looper;import Android.support.v7.app.ActionBarActivity; Import Android.view.menu;import Android.view.menuitem;import Android.view.view;import Android.view.view.onclicklistener;import Android.widget.button;import Android.widget.edittext;import Android.widget.toast;public class MainActivityExtends ActionBarActivity{EditText et_id; EditText ET_PSW;    Button Btn_login;        @Override protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (r.layout.Activity_main);    Initview (); The private Boolean check (string ID, string psw) {if ("". Equals (ID) | | "".    Equals (PSW)) return false;    return true;    } private void Initview () {et_id = (EditText) Findviewbyid (r.id.et_id);    ET_PSW = (EditText) Findviewbyid (R.ID.ET_PSW);        Btn_login = (Button) Findviewbyid (R.id.btn_login); Btn_login.setonclicklistener (New Onclicklistener () {@Overridepublic void OnClick (View v) {//TODO auto-generated method stub//gets the user name and password of the user input final string id = Et_id.gettext (). ToString (). Trim (); final string psw = Et_psw.gettext (). ToString (). Trim (), if (check (ID, PSW)) {new Thread () {public void run () {try {HttpPost post = new HttpPost ("Change this to the server file's URL address");//If the pass parameter More than one number, you can encapsulate the passed parameters list
 
  params = new ArrayList
  
   
();p Arams.add (new Basicnamevaluepair ("id", id));p arams.add (New Basicnamevaluepair ("PSW", PSW);// Set the request parameter Post.setentity (new urlencodedformentity (params, HTTP. Utf_8)); HttpClient HttpClient = new Defaulthttpclient ();//Send POST request HttpResponse response = Httpclient.execute (post);// If the server succeeds in returning the response if (Response.getstatusline (). Getstatuscode () = = () {//string msg = entityutils.tostring ( Response.getentity ()); httpentity entity = response.getentity (); InputStream is = Entity.getcontent (); BufferedReader reader = new BufferedReader (new InputStreamReader (IS, "Utf-8"), 8); StringBuilder sb = new StringBuilder (); Sb.append (Reader.readline () + "\ n"); Here "+" \ n "" Plus does not seem to have any effect on the results of string line = "0", while ((line = Reader.readline ()) = null) {Sb.append (line + "\ n"); Here "+" \ n "" added does not seem to have any effect on the result}is.close ();//Gets the request response result string = Sb.tostring (); SYSTEM.OUT.PRINTLN (result);//packaged into JSON for parsing jsonarray jsonarray = new Jsonarray (result); Jsonobject Jsondata = null;//Returns the user ID, user password, string userId = ""; String USERPSW = "";//Use LisT to store the list 
   
    data = new ArrayList
    
     (); for (int i = 0; i < jsonarray.length (); i++) {jsondata = Jsonarray.getjsonobject (i); userId = jsondata.getstring ("User Id "); The userid is derived from the server-side PHP program Response result Res
     IndexUnder
     IndexGets the value USERPSW = jsondata.getstring ("USERPSW"); USERPSW is derived from the server-side PHP program Response result Res
     IndexUnder
     IndexGet the value Data.add ("User id:" + userId + ", User password:" + USERPSW); Save the returned value, you can do the corresponding operation, here only display}looper.prepare (); Toast.maketext (Main
     Activity. This, data.tostring (), Toast.length_long). Show (); Looper.loop ();} else {looper.prepare (); Toast.maketext (Main
     Activity. This, "Login failed", Toast.length_long). Show (); Looper.loop ();}} Catch
     Exceptione) {e.printstacktrace ();}}}.    Start ();}}); } @Override Public boolean Oncreateoptionsmenu (Menu menu) {//Inflate the menu, this adds items to the Actio        n Bar if it is present.        Getmenuinflater (). Inflate (R.menu.main, menu);    return true; } @Override public boolean onoptionsitemselected (MenuItem Item) {//Handle Action Bar item clicks here. The action bar would//automatically handle clicks on the Home/up button, so long/As you specify a parent
     ActivityInch
     Androidmanifest.xml.        int id = item.getitemid ();        if (id = = r.id.action_settings) {return true;    } return super.onoptionsitemselected (item); }}
    
   
  
 

The following is a server-side PHP file (the file is not connected to the database operation, if you want, you can connect to the database , to obtain Dynamic data.) People who know PHP can easily change to connect to the database to get the data of the operation.

checkid.php

The above describes the android+php using HttpClient to submit a POST request, the use of JSON parsing response, including gravity,apache,exception, index, connection database content, I hope to be interested in PHP tutorial friends helpful.

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