Dynamically defining and using selectors

Question

I have a ListView which has custom elements inside of it. I want to create selectors for each of those elements. Selectors themselves will not be very complicated because they need to handle only background color while item is hovers/selected/etc. However colors for those selectors have to come from external source that is I need to be able to set them from variables, so some simple static code will not do.

How to define sector with all it`s parameters programmatically?
How to assign that selector programmatically to a specific view?

Cyril Maitre · Accepted Answer · 2012-10-05 22:08:13Z

StateListDrawable states = new StateListDrawable(); int yourBackgroundColor = Color.parseColor("#FFFFFF"); // Add specific color when your view has state 'pressed' states.addState(new int[] {android.R.attr.state_pressed}, new ColorDrawable(yourBackgroundColor)); // Add other states wanted and associated drawable // ... // As StateListDrawable extend Drawable, you can use it as background for exemple yourView.setBackground(states);

You can add states as many as you want into your StateListDrawable (List of states available: http://developer.android.com/guide/topics/resources/color-list-resource.html). For each states combination you can set specific and dynamic drawable.

You can specify multiple states to match for a drawable

states.addState(new int[] { -android.R.attr.state_focused, android.R.attr.state_selected, -android.R.attr.state_pressed}, ColorDrawable(yourBackgroundColor));

This time the color will be applied if your view is not focused, is selected and is not pressed.

V-rund Puro-hit · Accepted Answer · 2016-11-23 07:32:46Z

StateListDrawable states = new StateListDrawable(); int yourBackgroundColor = Color.parseColor("#FFFFFF"); // Add specific color when your view has state 'pressed' states.addState(new int[] {android.R.attr.state_pressed}, new ColorDrawable(yourBackgroundColor)); // Add other states wanted and associated drawable // ... // As StateListDrawable extend Drawable, you can use it as background for exemple yourView.setBackground(states);

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