How to change current Theme at runtime in Android [duplicate]

Answer 1

This way work for me:

  @Override
protected void onCreate(Bundle savedInstanceState) {
    setTheme(GApplication.getInstance().getTheme());
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);
}

Then you want to change a new theme:

GApplication.getInstance().setTheme(R.style.LightTheme);
recreate();

Answer 2

You can finish the Acivity and recreate it afterwards in this way your activity will be created again and all the views will be created with the new theme.

Answer 3

This had no effect for me:

public void changeTheme(int newTheme) {
    setTheme(newTheme);
    recreate();
}

But this worked:

int theme = R.style.default;

protected void onCreate(Bundle savedInstanceState) {
    setTheme(this.theme);
    super.onCreate(savedInstanceState);
}

public void changeTheme(int newTheme) {
    this.theme = newTheme;
    recreate();
}

Answer 4

If you want to change theme of an already existing activity, call recreate() after setTheme().

Note: don't call recreate if you change theme in onCreate(), to avoid infinite loop.

Answer 5

Instead of

getApplication().setTheme(R.style.BlackTheme);

use

setTheme(R.style.BlackTheme);

My code: in onCreate() method:

super.onCreate(savedInstanceState);

if(someExpression) {
    setTheme(R.style.OneTheme);
} else {
    setTheme(R.style.AnotherTheme);
}

setContentView(R.layout.activity_some_layout);

Somewhere (for example, on a button click):

YourActivity.this.recreate();

You have to recreate activity, otherwise - change won't happen

Answer 6

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);
}