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POMaintain WebView content scroll position on orientation change
 

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    <p>The browsers in Android 2.3+ do a good job at maintaining the scrolled position of content on an orientation changed. </p> <p>I'm trying to achieve the same thing for a WebView which I display within an activity but without success.</p> <p>I've tested the manifest change (android:configChanges="orientation|keyboardHidden") to avoid activity recreation on a rotation however because of the different aspect ratios the scroll position does not get set to where I want. Furthermore this is <strong>not</strong> a solution for me as I need to have different layouts in portrait and landscape.</p> <p>I've tried saving the WebView state and restoring it but this resuls in the content being displayed at the top again. </p> <p>Furthermore attempting to scroll in <code>onPageFinished</code> using <code>scrollTo</code> doesn't work even though the height of the WebView is non-zero at this point.</p> <p>Any ideas? Thanks in advance. Peter.</p> <p><strong>Partial Solution:</strong></p> <p>My colleague managed to get scrolling working via a javascript solution. For simple scrolling to the same vertical position, the WebView's 'Y' scroll position is saved in <code>onSaveInstanceState</code> state. The following is then added to <code>onPageFinished</code>:</p> <pre><code>public void onPageFinished(final WebView view, final String url) { if (mScrollY &gt; 0) { final StringBuilder sb = new StringBuilder("javascript:window.scrollTo(0, "); sb.append(mScrollY); sb.append("/ window.devicePixelRatio);"); view.loadUrl(sb.toString()); } super.onPageFinished(view, url); } </code></pre> <p>You do get the slight flicker as the content jumps from the beginning to the new scroll position but it is barely noticeable. The next step is try a percentage based method (based on differences in height) and also investigate having the WebView save and restore its state.</p>
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