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POHoneycomb background drawing issues
 

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    <p>I'm seeing drawing issues on Honeycomb that I can't figure out. For some reason when I add buttons to a view in code the background of the view disapears (becomes black).</p> <p>This works fine on my Galaxy tab running 2.3. It fails in the emulator or on my Motorolla Xoom running 3.2.</p> <p>Details:</p> <p>In onCreate() I'm setting either a background color or a background image on the relativeLayout defined in main.xml. My relativeLayout is defined as fill_parent.</p> <p>I have an OnTouchListener for my activity, in which I add two green buttons (one left aligned, one right aligned), to the relativeLayout.</p> <p>When I add those two buttons the background of the relativeLayout disappears (shows all black). I can't explain why.</p> <p>Clues:</p> <ul> <li><p>If I set the color of one of the green buttons to instead be Color.TRANSPARENT, everything works and my background doesn't disappear. This seems like a big clue, but I can't figure out what it means.</p></li> <li><p>When using color background, if I set the targetSdkVersion to "11" instead of "7" (I'm targetting 2.1/7) it works and my color background doesn't disappear. But images are still broken.</p></li> <li><p>When using color background, I can call setDrawingCacheBackgroundColor( Color.RED ) which results in a red background instead of black. I could use this as a solution, setting the cache color to my background color, but this doesn't work when using images.</p></li> </ul> <p>This really feels like a bug in android because I can't see that I'm doing anything wrong in my code. I'd appreciate any help or advice.</p> <p>Here's my simple main.xml layout:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:id="@+id/MyLayout"&gt; &lt;/RelativeLayout&gt; </code></pre> <p>Here's my activity code:</p> <pre><code>public class ViewTesterActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate( savedInstanceState ); // set the relative layout as our view setContentView( R.layout.main ); // get the relative layout android.widget.RelativeLayout layout = (android.widget.RelativeLayout) findViewById( R.id.MyLayout ); // set an on touch listener layout.setOnTouchListener( (android.view.View.OnTouchListener) mOnTouchListener ); // set a background image // PROBLEM: this background image disappears when adding the buttons in our touch handler // GOOFY FIX: If I change the color of one of the buttons we add to be Color.TRANSPARENT, this // background image doesn't disappear. layout.setBackgroundResource( R.drawable.icon ); layout.setDrawingCacheEnabled( false ); // alternatively, set background color // PROBLEM: the color disappears (becomes black) when adding the button in our touch handler // GOOFY FIX: If I change the color of one of the buttons we add to be Color.TRANSPARENT, the color // doesn't disappear // GOOFY FIX 2: If I set android:targetSdkVersion to "11" in our manifest, the color doesn't disappear // CLUE?: Without any fixes above and using color as the background, if I set the drawing cache color // to Color.RED it'll show up instead of black. This would be a great solution to my problem but it // doesn't work for background images. // layout.setDrawingCacheBackgroundColor( Color.RED ); // layout.setDrawingCacheEnabled( true ); } // on touch listener, add two buttons to the view private android.view.View.OnTouchListener mOnTouchListener = new android.view.View.OnTouchListener() { public boolean onTouch(View v, MotionEvent event) { if ( v != null ) v.onTouchEvent( event ); if ( event.getAction() == MotionEvent.ACTION_UP ) { android.widget.RelativeLayout layout = (android.widget.RelativeLayout) findViewById( R.id.MyLayout ); // add a green button, left aligned Button btn = new Button( ViewTesterActivity.this ); btn.setBackgroundColor( Color.GREEN ); // GOOFY FIX: setting this instead of green solves the issue, no disappearing background // btn.setBackgroundColor( Color.TRANSPARENT ); RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams( 100, 100 ); params.addRule( RelativeLayout.ALIGN_PARENT_LEFT ); layout.addView( btn, params ); // add a green button, right aligned btn = new Button( ViewTesterActivity.this ); btn.setBackgroundColor( Color.GREEN ); params = new RelativeLayout.LayoutParams( 100, 100 ); params.addRule( RelativeLayout.ALIGN_PARENT_RIGHT ); layout.addView( btn, params ); } return true; } }; } </code></pre>
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