java - How to save a cookie in an Android webview forever?

Question

With my code below, I have been able to save a cookie, but as soon as I close the application the cookie disappears.

How is this caused and how can I solve it?

package com.jkjljkj

import android.app.Activity;
import android.os.Bundle;
import android.view.Window;
import android.webkit.CookieSyncManager;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;

public class Activity extends Activity {

    /** Called when the activity is first created. */

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        CookieSyncManager.createInstance(getBaseContext());

        // Let's display the progress in the activity title bar, like the
        // browser app does.


        getWindow().requestFeature(Window.FEATURE_PROGRESS);

        WebView webview = new WebView(this);
        setContentView(webview);


        webview.getSettings().setJavaScriptEnabled(true);

        final Activity activity = this;
        webview.setWebChromeClient(new WebChromeClient() {
        public void onProgressChanged(WebView view, int progress) {
             // Activities and WebViews measure progress with different scales.
             // The progress meter will automatically disappear when we reach 100%
             activity.setProgress(progress * 1000);
        }
      });

      webview.setWebViewClient(new WebViewClient() {

         public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
              //Users will be notified in case there's an error (i.e. no internet connection)
              Toast.makeText(activity, "Oh no! " + description, Toast.LENGTH_SHORT).show();
         }
      });

      CookieSyncManager.getInstance().startSync();
      CookieSyncManager.getInstance().sync();

     //This will load the webpage that we want to see
      webview.loadUrl("http://");

   }
}

Answer 1

You have to tell the CookieSyncManager to sync after it has loaded the page in question. In your sample code, the onCreate method executes completely before the WebView tries to load the page, so the sync process (which happens asynchronously) will probably complete before the page is loaded.

Instead, tell the CookieSyncManager to sync onPageFinished in the WebViewClient. That should get you what you want.

The CookieSyncManager Documentation is a good read for how to do this properly.

Here is how you could set up your WebViewClient implementation to do this for you:

webview.setWebViewClient(new WebViewClient() {
    public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
        //Users will be notified in case there's an error (i.e. no internet connection)
        Toast.makeText(activity, "Oh no! " + description, Toast.LENGTH_SHORT).show();
    }

    public void onPageFinished(WebView view, String url) {
        CookieSyncManager.getInstance().sync();
    }
);

You would not need to tell the CookieSyncManager to sync elsewhere with this in place. I haven't tested this, so let me know if it works.