My new EBTCalc programmable calculator app has various Adapters used to populate databound Views. For instance, I use a BaseAdapter subclass to populate a GridView with the custom buttons found in the Javascript code.

Inflating a View, in other words creating a View from an XML layout file, is expensive. For this reason, Android will sometimes allow you to recycle a no-longer-used View in your Adapter.getView method. If your Adapter's getView method's View argument is non-null, use that View rather than creating a new View by calling LayoutInflater.inflate. When your getView is passed a non-null view, you'll still need to initialize the values of any Views inside of the View, but you will not need to inflate the View.

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	public View getView(int position, View convertView, ViewGroup parent) {
		LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

		// If convertView is not null, we recycle it (but repopulate it). If it's null we inflate a new view and populate it.
		View gridView = (convertView == null) ? inflater.inflate(R.layout.programmable_button, null) : convertView;

		// set value into button.
		Button programmableButton = (Button) gridView.findViewById(R.id.ProgrammableButton);
		
		MethodMetadata methodMetadata = (MethodMetadata) getItem(position);
		
		String argumentList = (methodMetadata.getArguments().size() > 0 && !methodMetadata.isButtonTextCustom()) ? String.format("(%s)", methodMetadata.getArgumentList()) : "";
		
		programmableButton.setText(String.format("%s%s", methodMetadata.getButtonText(), argumentList));

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