SettingsActivity.java 文件源码

public void changeActionBarColor(int newColor) {

        int color = newColor != 0 ? newColor : SettingsActivity.getPrimaryColor(this);
        Drawable colorDrawable = new ColorDrawable(color);

        if (oldBackground == null) {
            getSupportActionBar().setBackgroundDrawable(colorDrawable);

        } else {
            TransitionDrawable td = new TransitionDrawable(new Drawable[] { oldBackground, colorDrawable });
            getSupportActionBar().setBackgroundDrawable(td);
            td.startTransition(200);
        }

        oldBackground = colorDrawable;
    }