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POhardware accelerated webview slide-in animation flickering on ICS
 

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  1. POhardware accelerated webview slide-in animation flickering on ICS
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    <p>Our application makes heavy use of webviews. When testing on ICS, we noticed that we need to set the application property <code>hardwareAccelerated="true"</code>. However, doing this caused a few other bugs in our application, most of which we have fixed. We are still having problems getting our 'slide-in' animation working. Without any code changes, the animation simply does a 'reveal' type animation rather than sliding. We have tries a few different things:</p> <ol> <li>Adding a small alpha transition (.99->1). This changes the 'reveal' to a 'slide' but causes some weird artifacts on the screen sometimes.</li> <li>using hardware layers during the animation. This doesn't work consistently.</li> <li>using software layers during the animation. This works, but causes a slow redraw after the slide-in animation completes for the first time.</li> </ol> <p>Approach 3 is the most promising, but we have not figured out how to avoid the redraw. We have created a small test case using a sample project with a single activity:</p> <p>activity class:</p> <pre><code> int accelValue = View.LAYER_TYPE_NONE; //hack /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); addClickListenerAnimation(R.id.buttonhl, R.anim.to_left, View.VISIBLE, View.INVISIBLE); addClickListenerAnimation(R.id.buttonhr, R.anim.to_right, View.VISIBLE, View.INVISIBLE); addClickListenerAnimation(R.id.buttonsl, R.anim.from_left, View.INVISIBLE, View.VISIBLE); addClickListenerAnimation(R.id.buttonsr, R.anim.from_right, View.INVISIBLE, View.VISIBLE); final Button b = (Button) findViewById(R.id.accel); b.setOnClickListener( new View.OnClickListener() { @Override public void onClick(View v) { accelValue = ++accelValue % 3; b.setText(accelValue == 0 ? "NONE" : accelValue == 1 ? "S/W" : "H/W"); } }); } private void addClickListenerAnimation(int buttonId, final int animId, final int startVis, final int endVis) { Button b = (Button) findViewById(buttonId); b.setOnClickListener( new View.OnClickListener() { @Override public void onClick(View v) { final WebView wv = (WebView) findViewById(R.id.webview); final View layout = findViewById(R.id.frame); Animation a = AnimationUtils.loadAnimation(getApplicationContext(), animId); a.setDuration(500); a.setAnimationListener(new AnimationListener() { @Override public void onAnimationStart(Animation animation) { Log.i("sb", "layer type was " + wv.getLayerType()); Log.i("sb", "llayout layer type was " + layout.getLayerType()); wv.setLayerType(accelValue, null); Log.i("sb", "setting layer type " + accelValue); } @Override public void onAnimationRepeat(Animation animation) { } @Override public void onAnimationEnd(Animation animation) { wv.setLayerType(View.LAYER_TYPE_NONE, null); Log.i("sb", "restoring layout layer type " + layout.getLayerType()); } }); layout.setAnimation(a); layout.setVisibility(endVis); } }); } @Override protected void onStart() { super.onStart(); ((WebView)findViewById(R.id.webview)).loadUrl("http://www.wikipedia.org"); } </code></pre> <p>from_left.xml animation (other animation xmls are similar):</p> <pre><code>&lt;set xmlns:android="http://schemas.android.com/apk/res/android" android:shareInterpolator="true"&gt; &lt;translate android:fromXDelta="-100%" android:toXDelta="0%" android:fromYDelta="0%" android:toYDelta="0%" android:duration="600" android:zAdjustment="bottom" /&gt; &lt;/set&gt; </code></pre> <p>main.xml:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/llayout" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" &gt; &lt;FrameLayout android:id="@+id/frame" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_weight="1" android:visibility="invisible" &gt; &lt;WebView android:id="@+id/webview" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_weight="1"/&gt; &lt;/FrameLayout&gt; &lt;View android:layout_width="fill_parent" android:layout_height="80dp" android:background="#FF000000" /&gt; &lt;LinearLayout android:layout_width="fill_parent" android:layout_height="80dp" android:orientation="horizontal" &gt; &lt;Button android:id="@+id/buttonsl" android:layout_width="wrap_content" android:layout_height="fill_parent" android:text="show L" /&gt; &lt;Button android:id="@+id/buttonhl" android:layout_width="wrap_content" android:layout_height="fill_parent" android:text="hide L" /&gt; &lt;Button android:id="@+id/buttonsr" android:layout_width="wrap_content" android:layout_height="fill_parent" android:text="show R" /&gt; &lt;Button android:id="@+id/buttonhr" android:layout_width="wrap_content" android:layout_height="fill_parent" android:text="hide R" /&gt; &lt;Button android:id="@+id/accel" android:layout_width="wrap_content" android:layout_height="fill_parent" android:text="NONE" /&gt; &lt;/LinearLayout&gt; &lt;/LinearLayout&gt; </code></pre> <p>manifest:</p> <pre><code>&lt;uses-sdk android:minSdkVersion="14" /&gt; &lt;uses-permission android:name="android.permission.INTERNET" /&gt; </code></pre>
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