Php generates an Android client to scan the login QR code, android Client
The examples in this article share with you the QR code generated on the php web page and the specific code for scanning logon on the Android client for your reference. The details are as follows:
The ZXing open-source library with code scanning function on Github is used, and the web API for generating QR code images through random numbers is used. The entire process goes through three steps:
1. The PHP web page generates a QR code and the random number is stored in the database;
2. Scan the Android client and save the username to the location corresponding to the random number;
3. at intervals of time, PHP poll the database through Ajax to determine whether it is empty. If it is not empty, it will jump to the webpage.
Code:
1. Generate a QR code image by using a random number, and execute the polling Operation Command on the home page.
<Html>2. Database Connection page
<? Php/*** database connection file * @ author Cenquanyu * @ version July 22, May 12, 2016 **/$ con = mysql_connect ("localhost", "root ","") or die (mysql_error (); mysql_select_db ("qr_login");?>3. For the page on which the round-robin operation is executed, jump if username is not empty
<? Php/*** @ author Cenquanyu * @ version May 12, 2016 * executes the round robin operation. If the username field in the corresponding location of the random number in the database is not blank *, false is returned, if the page is not redirected * not blank, it indicates that a user has scanned the QR code and logged on to the page */require 'mysql _ connect. php '; $ randnumber = $ _ GET ['randnumber']; $ result = mysql_query ("select * from login_data where randnumber =' $ randnumber '"); $ row = mysql_fetch_array ($ result); if ($ row ['username']! = "") Echo "true"; else echo "false";?>4. Customize the API to save the username of the Client
<? Php/*** @ author Cenquanyu * @ version May 12, 2016 custom API is used for Android client QR code logon. The username of the client is saved to the corresponding random number location of the QR code in the database. * Parameter: username, randnumber * No return value */$ randnumber = $ _ GET ('randnumber'); $ username =$ _ GET ('username '); require 'mysql _ connect. php '; mysql_query ("update qr_login set username =' $ username' where randnumber = '$ randnumber'");?>5. Activity on the Android client performing the code scanning operation
Package com. cenquanyu. qrlogin; import com. cenquanyu. qrlogin. r; import com. zxing. activity. captureActivity; import android. app. activity; import android. content. intent; import android. graphics. paint. cap; import android. OS. bundle; import android. view. view; import android. view. view. onClickListener; import android. widget. button; import android. widget. editText; import android. widget. toast;/*** @ author Cenquanyu * @ Version May 12, 2016 **/public class MainActivity extends Activity implements OnClickListener {private Button btnScan; private EditText etUsername; private static final String WEB_URL = "http: // 172.31.19.202/QRLogin /"; // change the address @ Override protected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_main); btnScan = (Button) findViewBy Id (R. id. btnScan); btnScan. setOnClickListener (this); etUsername = (EditText) findViewById (R. id. etUsername) ;}@ Override public void onClick (View v) {// scan the code to operate Intent intent = new Intent (this, CaptureActivity. class); startActivityForResult (intent, 0); // return result} @ Override protected void onActivityResult (int requestCode, int resultCode, Intent data) {super. onActivityResult (requestCode, resultCode, data); If (resultCode = Activity. RESULT_ OK) {String randnumber = data. getExtras (). getString ("result"); // The client returns the scan result after scanning the code. The random number corresponding to the QR code is retrieved. String username = etUsername. getText (). toString (); String url = WEB_URL + "saveUsername. php? Randnumber = "+ randnumber +" & username = "+ username; HttpUtils. login (url); // access url }}}6. Network request
package com.Cenquanyu.qrlogin; import java.io.IOException;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL; public class HttpUtils{ public static void login(final String url){ new Thread(new Runnable() { @Override public void run() { HttpURLConnection connection; try { connection = (HttpURLConnection) new URL(url).openConnection(); connection.setRequestMethod("GET"); connection.getInputStream(); } catch (Exception e) { e.printStackTrace(); } } }).start(); }}The above is all the content of this article, hoping to help you learn.
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