动态更改ListView中所有项目的文本颜色

Question

I want to change my activity theme dynamically without recreating activity, the only solution I've found is to change items properties (like background, textColor) in place, but I have a ListView with number of items, I can iterate through all items in ListView and change textColor , but I think it's kinda an ugly solution.
Is there any better way to achieve this?

Thank you in advance

Answer 1

You could do something like this in your Adapters getView() method:

int theme = getThemeColorFromPrefrences();

if(theme == darkTheme){
   textView.setTextColor(...);
}
else{...}

Now every time the user changes the color, you just call invalidateViews() on your ListView :

// set other theme color [...]
myListView.invalidateViews()

Answer 2

I assume you have custom arraylist of object, on that put a private int color

class myobject {
    private int color;
    public void setColor(int color) { this.color=color; }
    public int getColor { return color; }
}

on your custom ArrayAdapter List in getView() set

((TextView)view.findViewById(R.id.textview)).setColor(item.getColor());
//Where item is your MyObject at ArrayList(Position)

When you want to change color just, on your onClick button Black

onClick() {
    for(int i=0;i<arraylist.size();i++) { arraylist.get(i).setColor(Color.Black); }
    arrayadapter.notifydatachange();
}

Answer 3

您可以将自己的布局用于ListView行，这样您就可以在布局文件中指定文本颜色。