java – Refresh activity without re-opening it?-ThrowExceptions

Exception or error:

I implemented a button in my app that clears all sharedpreferences using this code:

context.getSharedPreferences("bifrostPrefs", 0).edit().clear().commit();

Now the problem is that whenever I use the button, I then need to exit the activity and re-open it to see results. I tried solving this by simply making the button re-open the activity with this code:

Intent reOpen = new Intent (Bifrost.this, Bifrost.class);
startActivity(reOpen);

My idea seemed smart until I noticed that if I re-open the activity, I then need to press the back button twice to get back to main activity. So I did some reserach and found this code:

finish();
startActivity(getIntent());

This now works fine, the activity gets refreshed and then I only need to click the back button once. But is there another way to refresh activity without it “flashing” in and out? As you know, everytime you open a new activity, it flashes in and out so the app lags for a second. Is there a way to refresh an activity by bypassing this?

How to solve:

Well, it would be better to update the content of the activity, but if it’s too complicated you can override the default animation with this method :

finish();
overridePendingTransition( 0, 0);
startActivity(getIntent());
overridePendingTransition( 0, 0);

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You can add the flag Intent.FLAG_ACTIVITY_NO_ANIMATION (link) to your reOpen intent to eleminate all animations. But as stated from the other answer better refresh the data inside you Activity.

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do you have some views that may change their value/size based on values from your shared preferences? if yes, create a method that init the views and call that methon on onCreate() method and in onClick() method.

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