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:

When I run it's still dialog themed.

API10

Thanks.

user_12407819 · 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("NightMode", 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_9005383 · 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)
}

OR using setTheme(R.style.AppTheme_Light):

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    //The call goes right after super.onCreate() and before setContentView()
    setTheme(R.style.AppTheme_Light)
    setContentView(R.layout.activity_main)
}

Change Activity's theme programmatically

5 Answers