/Java/How to change theme of app in android studio programmatically

How to change theme of app in android studio programmatically

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);
  }

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