Change Activity s theme programmatically

Question

In particular cases I need to remove dialog theme from my activity but it doesn t seem to be working  Here s an example  First activity   public void onCreate Bundle savedInstanceState        super onCreate savedInstanceState       setContentView R layout activity main       startActivity new Intent MainActivity this  SecondActivity class        Second activity   public void onCreate Bundle savedInstanceState           TODO Auto-generated method stub     super onCreate savedInstanceState       setTheme android R style Theme       setContentView R layout activity second       Manifest excerpt     lt activity android name  SecondActivity  android theme   android style Theme Dialog  gt  lt  activity gt    When I run it s still dialog themed   API10  Thanks

User · Answer

I know that i am late but i would like to post a solution here:
Check the full source code here.
This is the code i used when changing theme using preferences..

SharedPreferences pref = PreferenceManager
        .getDefaultSharedPreferences(this);
String themeName = pref.getString("prefSyncFrequency3", "Theme1");
if (themeName.equals("Africa")) {
    setTheme(R.style.AppTheme);



} else if (themeName.equals("Colorful Beach")) {
    //Toast.makeText(this, "set theme", Toast.LENGTH_SHORT).show();
    setTheme(R.style.beach);


} else if (themeName.equals("Abstract")) {
    //Toast.makeText(this, "set theme", Toast.LENGTH_SHORT).show();

    setTheme(R.style.abstract2);

} else if (themeName.equals("Default")) {

    setTheme(R.style.defaulttheme);

}

Please note that you have to put the code before setcontentview..

HAPPY CODING!

User · Answer

As docs say you have to call setTheme before any view output  It seems that super onCreate   takes part in view processing   So  to switch between themes dynamically you simply need to call setTheme before super onCreate like this   public void onCreate Bundle savedInstanceState        setTheme android R style Theme       super onCreate savedInstanceState       setContentView R layout activity second

User · Answer

I have used this code to implement dark mode   it worked fine for me   You can use it in a switch on    listener      setting up Night Mode     AppCompatDelegate setDefaultNightMode AppCompatDelegate MODE NIGHT YES     Store current mode in a sharedprefernce to retrieve on restarting app             editor putBoolean  quot NightMode quot   true               editor apply      restart all the activities to apply changed mode                TaskStackBuilder create getActivity                         addNextIntent new Intent getActivity    MainActivity class                        addNextIntent getActivity   getIntent                         startActivities

User · Answer

This one works fine for me    theme applyStyle R style AppTheme  true   Usage     override fun onCreate savedInstanceState  Bundle         super onCreate savedInstanceState        The call goes right after super onCreate   and before setContentView       theme applyStyle R style AppTheme  true      setContentView layoutId      onViewCreated savedInstanceState

User · Answer

user1462299 s response works great  but if you include fragments  they will use the original activities theme  To apply the theme to all fragments as well you can override the getTheme   method of the Context instead    Override public Resources Theme getTheme         Resources Theme theme   super getTheme        if useAlternativeTheme           theme applyStyle R style AlternativeTheme  true                you could also use a switch if you have many themes that could apply     return theme      You do not need to call setTheme   in the onCreate   Method anymore  You are overriding every request to get the current theme within this context this way

[android] Change Activity's theme programmatically

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