On 25 Lut, 23:51, user123 <[email protected]> wrote:
> I want to apply certain transforms to a view and it's children during
> pressed state, e.g. a color filter.
>
> As far my current knowledge, I can't do this using StateListDrawable or XML
> configuration.
>
> The concrete situation: A GridView where the cells have a background
> drawable, an ImageView, and text. When the user is pressing a cell, I want
> to change the background, to apply a PorterDuff color filter to the image,
> and change the color of the text. The images are downloaded from the web.
>
>
> Does anybody have an advice for this?
>
> Thanks in advance.
step #1: override getView in your adapter
step #2: before returning your grid item set its Drawable to:
GridDrawable d = new GridDrawable();
v.setBackgroundDrawable(d);
return v;
step#3: create GridDrawable class:
class GridDrawable extends Drawable {
@Override
protected boolean onStateChange(int[] state) {
String st = StateSet.dump(state);
Log.d(TAG, "onStateChange " + st);
// set the color fileter if state is either:
// {android.R.attr.state_selected} or
// {android.R.attr.state_pressed}
return false;
}
@Override
public boolean isStateful() {
return true;
}
@Override
public void draw(Canvas canvas) {
}
@Override
public void setAlpha(int alpha) {
}
@Override
public void setColorFilter(ColorFilter cf) {
}
@Override
public int getOpacity() {
return PixelFormat.TRANSLUCENT;
}
}
pskink
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