Here with the code in Android Studio. I also add the html code that below the Android Studio code, using javascript to remember the username and password in cookies. It works in some android device only. I don'y know why. I would like to make it works for all the android device. Hope it will be a simple way to do it. Please kindly help. I want the user typed in his username/password one time, it should be filled out on next visit.
public class MainActivity extends AppCompatActivity {
private Toolbar toolbar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.app_bar);
setSupportActionBar(toolbar);
getSupportActionBar().setTitle("Go To Our Facebook Page");
WebView myWebView = (WebView) findViewById(R.id.webview);
myWebView.setWebViewClient(new WebViewClient());
WebSettings webSettings = myWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
myWebView.loadUrl("http://www.hksalonjob.comslogin.php");
}
here with the html code, using javascript to remember the username and password.
<!DOCTYPE HTML>
<html>
<head>
<title>Salon Job HK</title>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<meta name="description" content="" />
<meta name="keywords" content="" />
<!--[if lte IE 8]><script src="css/ie/html5shiv.js"></script><![endif]-->
<script src="js/jquery.min.js"></script>
<script src="js/jquery.scrolly.min.js"></script>
<script src="js/jquery.dropotron.min.js"></script>
<script src="js/jquery.scrollex.min.js"></script>
<script src="js/skel.min.js"></script>
<script src="js/skel-layers.min.js"></script>
<script src="js/init.js"></script>
<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
<noscript>
<link rel="stylesheet" href="css/skel.css" />
<link rel="stylesheet" href="css/style.css" />
<link rel="stylesheet" href="css/style-xlarge.css" />
</noscript>
<!--[if lte IE 9]><link rel="stylesheet" href="css/ie/v9.css" /><![endif]-->
<!--[if lte IE 8]><link rel="stylesheet" href="css/ie/v8.css" /><![endif]-->
</head>
<body>
<!-- Header -->
<!-- Main -->
<div id="main" class="wrapper style1">
<div class="container">
<form ACTION="<?php echo $loginFormAction; ?>" name="form1" method="POST">
<div class="12u$">
<input type="tel" name="tel" required id="tel" pattern="[0-9]{1}[0-9]{7}" maxlength="8" value="" placeholder="phone number"/>
</div>
<br>
<div class="12u$">
<input type="password" name="spassword" required id="spassword" maxlength="8" placeholder="" />
</div>
<br>
<div class="12u$">
<input type="checkbox" name="sremember" id="sremember" />
<label for="sremember">Remember me</label>
</div>
<INPUT Type="submit" class="button special fit" name="Login" id="Login" value="login">
</form>
<script>
//remember username and password
$(function() {
if (localStorage.chkbx && localStorage.chkbx != '') {
$('#sremember').attr('checked', 'checked');
$('#tel').val(localStorage.tel);
$('#spassword').val(localStorage.spassword);
} else {
$('#sremember').removeAttr('checked');
$('#tel').val('');
$('#spassword').val('');
}
$('#sremember').click(function() {
if ($('#sremember').is(':checked')) {
// save username and password
localStorage.tel = $('#tel').val();
localStorage.spassword = $('#spassword').val();
localStorage.chkbx = $('#sremember').val();
} else {
localStorage.tel = '';
localStorage.spassword = '';
localStorage.chkbx = '';
}
});
});
</script>
</div>
</div>
</body>
</html>
Please check whether the webview stores cookies, e.g. like this:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.app_bar);
setSupportActionBar(toolbar);
getSupportActionBar().setTitle("Go To Our Facebook Page");
//not sure if you need this
CookieSyncManager.createInstance(this;
//it is default true, but hey...
CookieManager.getInstance().setAcceptCookie(true);
WebView myWebView = (WebView) findViewById(R.id.webview);
myWebView.setWebViewClient(new WebViewClient() {
@Override
public void onPageFinished(WebView view, String url) {
//Do you have cookies?
Log.d("Cookie", "url: " + url + ", cookies: " + CookieManager.getInstance().getCookie(url));
}
});
WebSettings webSettings = myWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
myWebView.loadUrl("http://www.hksalonjob.comslogin.php");
}
EDIT: Ok, forget my lines above :-)
Be careful, what i write here is no good practice in security perception. I only show you the basics how it could basically work (totally untested).
You can exchange data between Java and Javascript with JavascriptInterface:
In Java:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.app_bar);
setSupportActionBar(toolbar);
getSupportActionBar().setTitle("Go To Our Facebook Page");
WebView myWebView = (WebView) findViewById(R.id.webview);
myWebView.setWebViewClient(new WebViewClient() {
@Override
public void onPageFinished(WebView view, String url) {
//Is the url the login-page?
if (url.equals ("http://www.hksalonjob.comslogin.php") == true) {
//load javascript to set the values to input fields
SharedPreferences prefs = getPreferences(MODE_PRIVATE);
String usr= prefs.getString("usr", null);
String pwd= prefs.getString("pwd", null);
if (usr== null || pwd == null) {
//we have no values - leave input fields blank
return;
}
view.loadUrl("javascript:fillValues(" + usr + "," + pwd + ");");
}
}
});
myWebView.addJavascriptInterface(new JavaScriptInterface(), "Android");
WebSettings webSettings = myWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
myWebView.loadUrl("http://www.hksalonjob.comslogin.php");
}
private class JavaScriptInterface {
/**
* this should be triggered when user and pwd is correct, maybe after
* successful login
*/
public void saveValues (String usr, String pwd) {
if (usr == null || pwd == null) {
return;
}
//save the values in SharedPrefs
SharedPreferences.Editor editor = getPreferences(MODE_PRIVATE).edit();
editor.putString("usr", usr);
editor.putString("pwd", pwd);
editor.apply();
}
}
In Javascript:
//trigger this after successful login
function afterSuccessLogin(usr, pwd) {
if (Android != undefined) {
if (Android.saveValues != undefined) {
Android.saveValues(usr, pwd);
}
}
}
// this will be triggered by webview
function fillValues(usr, pwd) {
//fill input fields with values
}
来源：https://stackoverflow.com/questions/31793640/how-to-make-android-webview-remember-username-and-password