How to send POST data with code in an android webview

Question

I have an android application that consists of a WebWiew and I need to login to a site automatically using code. I've tried using postUrl() and it seems to work... but only on some sites.

Here's the code I'm using:

public class webviewActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        WebView webview = new WebView(this);
        setContentView(webview);
        WebSettings webSettings = webview.getSettings();
        webSettings.setJavaScriptEnabled(true);

        webview.setWebViewClient(new WebViewClient());

        String postData = "[email protected]&login_password=myPassword";
        webview.postUrl("https://www.dropbox.com/login", EncodingUtils.getBytes(postData, "utf-8"));
    }
}

This Works great for dropbox.com, but other sites like google.com, facebook.com, etc. just load the login page or give an error (google.com gives an error saying I need to enable cookies).

Right now I'm just going the post data by hand; looking at the login form for the site and putting the name/value fields in the postData in my code. On sites like google, the login form has many hidden fields and I've been adding those to the postData also.

If anyone could give me any idea of something I'm doing wrong please let me know, I'm pretty confused about this.

can we check this in Postman ??? if yes how to do so ??

Sagar Nayak
– Sagar Nayak

2018-04-13 05:04:09 +00:00
Commented Apr 13, 2018 at 5:04 — Sagar Nayak
– Sagar Nayak, Commented Apr 13, 2018 at 5:04

an00b · Accepted Answer · 2011-12-07 18:25:02Z

15

Try replacing "utf-8" (in the 2nd param) with "BASE64".

answered Dec 7, 2011 at 18:25

an00b

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3 Comments

javajavajavajavajava Over a year ago

Hi an00b. Thanks for the answer! I believe I have tried this with no luck. I'm no longer working on this specific problem, I decided to go a separate route. I'll vote you up anyway, because I really appreciate the answer.

raudi Over a year ago

"BASE64" is no character set, so this may work (depending on the postData) but it may as well fail. The correct way is to encode the postData to be "application/x-www-form-urlencoded" encoded, which can be done with URLEncoder.encode(postData, "UTF-8");

D4rWiNS Over a year ago

raudi can u put an answer with a snippet useing "application/x-www-form-urlencoded"

filippo · Accepted Answer · 2014-04-02 19:04:48Z

11

public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    WebView webView = new WebView(this);

    setContentView(webView);

    String url = "http://example.com/somepage.php";
    String postData = "postvar=value&postvar2=value2";

    webView.postUrl(url, EncodingUtils.getBytes(postData, "base64"));
}

edited Apr 2, 2014 at 19:04

filippo

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answered Jan 23, 2012 at 11:33

Laxman

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2 Comments

Johnny Over a year ago

I read the source code of EncodingUtils.java in Android HERE EncodingUtils.getBytes(postData, "base64") as same as postData.getBytes(). Just use postData.getBytes() instead of EncodingUtils. (If you need migrate to Android M (API 23) with no EncodingUtils)

NinjaCoder Over a year ago

You saved my day dude.

pruthwiraj.kadam · Accepted Answer · 2017-10-26 09:50:07Z

2

WebView myWebView = (WebView) findViewById(R.id.webview);

String url="http://www.example.org/login";

String postData=
                "username="+URLEncoder.encode("abc","UTF8")+
                "&password="+URLEncoder.encode("***", "UTF-8");

myWebView.postUrl(url,postData.getBytes());

answered Oct 26, 2017 at 9:50

pruthwiraj.kadam

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1 Comment

viper Over a year ago

Where should we mention the "x-www-form-urlencoded" format?

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