How to Prevent Going Back to the Previous Activity

How to prevent going back to the previous activity?

My suggestion would be to finish the activity that you don't want the users to go back to. For instance, in your sign in activity, right after you call startActivity, call finish(). When the users hit the back button, they will not be able to go to the sign in activity because it has been killed off the stack.

Disable ability go back to previous activity

This will clear back task of application and when you press back button application will close. You need to add flags in Intent or you can use finish().

val intent = Intent(this, MainActivity::class.java)
intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK
startActivity(intent)
finish()

Stop user from going back to MANY previous activities in Android

Start your activity with these flags:

(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK)

Navigating back to previous Activity

1) when navigation from activity A to B, the android system does not destroy activity A, but takes it to the back stack and adds B to the foreground. thats why when you press the back button or call onBackPressed() from the java code activity B is destroyed and A is set to the foreground. here is an example from the docs : Understand Tasks and Back stack

2) when using an intent/navigateUpFromSameTask activity A is recreated and set to the foreground and B is set to the background, it's like adding another activity A to the stack so it will be A,B,A but if you press the back btn then you will be back to B and then A.

if you want to keep the scroll position and other data in activity A you call the onBackPressed in B or use the onSaveInstanceState to save the data and use it in the onCreate .

here is an example of saved instance:

@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
    super.onSaveInstanceState(savedInstanceState);
    savedInstanceState.putString("VariableName", variableData);
    savedInstanceState.putString("VariableName", variableData);
    savedInstanceState.putString("VariableName", variableData);
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.penguin_main);

    if(savedInstanceState!=null){
    bookData = (String) savedInstanceState.getSerializable("VariableName");
    bookData =  (String) savedInstanceState.getSerializable("VariableName");
    bookData =  (String) savedInstanceState.getSerializable("VariableName");
    }
}

How can I disable 'go back' to some activity?

Call finish() in your Splash Screen activity right after starting the next activity.

Another approach is to add this attribute to your activity in AndroidManifest.xml: android:noHistory="true"

Example:

<activity android:name=".SplashActivity" android:noHistory="true"/>

This attribute instructs Android to remove SplashActivity from the history stack once its navigated away from.

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