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- Go to manifest and move Main/Launcher intent filters to Splash activity

Thread splash = new Thread(new Runnable() {
     
      @Override
      public void run() {
  
          try { sleep(2000); }
          catch (Exception e) { }
  
          startActivity(new Intent(getApplicationContext(), DesiredActivity.class));
          finish();
      }
});

splash.start();