CODEWITHSUNDEEP
android
user1462299
user1462299

Reputation: 4287

Change Activity's theme programmatically

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:

 <activity android:name="SecondActivity" android:theme="@android:style/Theme.Dialog"></activity>

When I run it's still dialog themed.

API10

Thanks.

Upvotes: 146

Views: 175758

Answers (5)

Tamim Attafi
Tamim Attafi

Reputation: 2511

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)
}

Upvotes: 5

Noby Ali
Noby Ali

Reputation: 63

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();

Upvotes: 5

Bj&#246;rn Kechel
Bj&#246;rn Kechel

Reputation: 8463

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.

Upvotes: 61

user1462299
user1462299

Reputation: 4287

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);
}

Upvotes: 224

dondondon
dondondon

Reputation: 901

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!

Upvotes: 15

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