Android: Preventing going back to the previous activity

I want to do this on Android: basically when BACK button is pressed on the phone, I want to prevent a specific activity to return to its previous one.

Specifically, I have login and sign up screens, both start a new activity called HomeScreen when successful login/signup occurs. Once HomeScreen is started, I want to prevent the users to be able to return login or sign up screens with pressing BACK key.

I tried using Intent.FLAG_ACTIVITY_NO_HISTORY but since the application has Facebook integration, when the 'Login with Facebook' is used, Facebook should return to initial login screen, therefore I should keep a history of these activities.

I thought of overriding behaviour of BACK button on HomeScreen to directly finish application when the button is pressed and I used

@Override
public void onBackPressed() {
    finish();
}

but that also does not work.

I am quite new in Android development, so any help would be very useful.

Thanks in advance.

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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.

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Following solution can be pretty useful in the usual login / main activity scenario or implementing a blocking screen.

To minimize the app rather than going back to previous activity, you can override onBackPressed() like this:

@Override
public void onBackPressed() {
    moveTaskToBack(true);
}

moveTaskToBack(boolean nonRoot) leaves your back stack as it is, just puts your task (all activities) in background. Same as if user pressed Home button .

Parameter boolean nonRoot - If false then this only works if the activity is the root of a task; if true it will work for any activity in a task.

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I'm not sure exactly what you want, but it sounds like it should be possible, and it also sounds like you're already on the right track.

Here are a few links that might help:

Disable back button in android

  MyActivity.java =>
    @Override
    public void onBackPressed() {

       return;
    }

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

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

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