Changing the whole application theme dynamically - android-activity

Question

I found many ways to change the activities theme dynamically.
But I use some chart and graph from aChartengine that can't change their theme, because they are not just like activities.
So, I need to find out a way to change app theme dynamically so that also my charts theme will change too!
I wonder if someone can solve this problem.
This is my code, which works on each activity:
public class Utils
{
private static int sTheme;
public final static int THEME_DEFAULT = 0;
public final static int THEME_WHITE = 1;
public final static int THEME_BLUE = 2;
public final static int THEME_PINK = 3;
/**
* Set the theme of the Activity, and restart it by creating a new Activity
* of the same type.
*/
public static void changeToTheme(Activity activity, int theme)
{
sTheme = theme;
activity.finish();
activity.startActivity(new Intent(activity, activity.getClass()));
}
/** Set the theme of the activity, according to the configuration. */
public static void onActivityCreateSetTheme(Activity activity)
{
switch (sTheme)
{
default:
case THEME_DEFAULT:
break;
case THEME_WHITE:
activity.setTheme(R.style.Theme_white);
break;
case THEME_BLUE:
Log.i("THM", "blue intered in utils");
activity.setTheme(R.style.Theme_blue);
break;
case THEME_PINK:
activity.setTheme(R.style.Theme_pink);
break;
}
}
}
And I use this code to change my activity theme:
Utils.changeToTheme(G.tabActivity, Utils.THEME_DEFAULT);

Answer 1

You can store your current theme in SharedPreferences and apply it on start of your app:
SharedPreferences pref = context.getSharedPreferences("your_pref_name", android.content.Context.MODE_PRIVATE);
String theme = pref.getString("your_pref_key", "your_default_theme");
context.setTheme(theme);
Then, when you change your theme you should restart application:
Intent intent = getPackageManager().getLaunchIntentForPackage(getPackageName());
finish();
startActivity(intent);