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POCan an Android WebView do a translationX animation with hardware acceleration?
 

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  1. POCan an Android WebView do a translationX animation with hardware acceleration?
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    <p>I had read somewhere that hardware acceleration should work for all built in Android views; however, when I try to do a slide animation with a WebView the entire Web Content goes blank for the duration of the animation.</p> <p>I'll write a little app so if you would like to see it for yourselves, you can try. The app will do a slide animation every time a page loads in the WebView. We'll slide between an ImageView and a WebView. The ImageView will just contain a screenshot of the WebView itself. Stick the following code in onCreate for your activity:</p> <pre><code>final WebView myWebView = (WebView) findViewById(R.id.webview); myWebView.loadUrl("http://www.google.com"); final ImageView myImageView = (ImageView) findViewById(R.id.imageView); myWebView.setWebViewClient(new WebViewClient() { public void onPageFinished(WebView view, String url) { myWebView.setDrawingCacheEnabled(true); myWebView.buildDrawingCache(); myImageView.setImageBitmap(Bitmap.createBitmap(myWebView.getDrawingCache())); myWebView.setDrawingCacheEnabled(false); myImageView.setVisibility(View.VISIBLE); myWebView.setLayerType(View.LAYER_TYPE_HARDWARE, null); ObjectAnimator webViewAnimator = ObjectAnimator.ofFloat(myWebView, "translationX", myWebView.getWidth(), 0); webViewAnimator.setDuration(SLIDE_DURATION); ObjectAnimator imageViewAnimator = ObjectAnimator.ofFloat(myImageView, "translationX", 0, -myWebView.getWidth()); imageViewAnimator.setDuration(SLIDE_DURATION); AnimatorSet set = new AnimatorSet(); set.addListener(new AnimatorListenerAdapter() { public void onAnimationEnd(Animator animation) { myWebView.setLayerType(View.LAYER_TYPE_NONE, null); myImageView.setVisibility(View.GONE); } }); set.playTogether(webViewAnimator, imageViewAnimator); set.start(); } } </code></pre> <p>Ensure you have android:hardwareAccelerated="true" in your Manifest.xml</p> <p>Also, in your main_layout.xml:</p> <pre><code>&lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" &gt; &lt;WebView android:id="@+id/webview" android:layout_width="match_parent" android:layout_height="match_parent" /&gt; &lt;ImageView android:id="@+id/imageView" android:contentDescription="@string/image_view_description" android:layout_width="match_parent" android:layout_height="match_parent" android:visibility="gone" /&gt; &lt;/RelativeLayout&gt; </code></pre> <p>Now every time you load a page, there will be a slide transition between an ImageView (containing a screenshot of the WebView), and the WebView itself. </p> <p><strong>The bug is not reproducable in the JellyBean simulator, however it does happen on all ICS/JellyBean devices tested so far...</strong></p> <p>Any insight into this issue would be greatly appreciated. Note that although I can simply disable Hardware Acceleration on the WebView by setting it's Layer Type to LAYER_TYPE_SOFTWARE and this will fix the "blanking out" issue, I would like to keep Hardware Acceleration enabled because of the rendering benefits.</p>
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