Databases
StackOverflow2013
Postsdbo
PO
 

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    <p>You should not cache Drawables -- the Drawable object is very stateful, and intended to be used by one and only one owner.</p> <p>If you want to implement a cache, you should be caching the drawable's constant state.</p> <p>The constant state is retrieve with this:</p> <p><a href="http://developer.android.com/reference/android/graphics/drawable/Drawable.html#getConstantState%28%29" rel="noreferrer">http://developer.android.com/reference/android/graphics/drawable/Drawable.html#getConstantState()</a></p> <p>(Note this method can return null; not all Drawables have constant state.)</p> <p>You can later instantiate new Drawables from a constant state with this:</p> <p><a href="http://developer.android.com/reference/android/graphics/drawable/Drawable.ConstantState.html#newDrawable%28android.content.res.Resources%29" rel="noreferrer">http://developer.android.com/reference/android/graphics/drawable/Drawable.ConstantState.html#newDrawable(android.content.res.Resources)</a></p> <p>Also keep in mind that Resources already maintains a cache of Drawables for you, using this facility, so there is no need for you to implement your own cache for any Drawables you are retrieving from Resources.</p> <p>And if you are making your own Drawables outside of resources, I would strongly recommend making a cache of the underlying data (such as a bitmap downloaded from the network) then trying to mess with the constant state. (And again, definitely don't cache Drawable objects themselves.)</p>
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    1. POConsequences of drawable.setCallback(null);
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    1. UShackbod
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    1. POConsequences of drawable.setCallback(null);
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    1. COThis is a cache of Drawables made from Bitmaps downloaded from network and shown in a ListView. So you are suggesting to cache actual bitmaps? Is there any significant performance overhead in creating Drawable from Bitmap?
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    2. COI should probably just use setImageBitmap instead of setImageDrawable.
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    3. COYep just cache the bitmaps. A drawable is very cheap to make compared to loading a bitmap. It just holds a reference to the bitmap.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

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