How to prevent going back to the previous activity

Question

When the BACK button is pressed on the phone  I want to prevent a specific activity from returning 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 from being able to return to the login or sign up screens by pressing the 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 the initial login screen  therefore I should keep a history of these activities   I thought of overriding the behaviour of the BACK button on HomeScreen to directly finish an application when the button is pressed and I used   Override public void onBackPressed         finish        but that also does not work

User · Answer

If you don t want to go back to all the activities on your application  you can use   android launchMode  singleTask    Learn more here  http   developer android com guide topics manifest activity-element html

User · Answer

finish   gives you method to close current Activity not whole application  And you better don t try to look for methods to kill application  Little advice   Have you tried conjunction of Intent FLAG ACTIVITY EXCLUDE FROM RECENTS   Intent FLAG ACTIVITY NO HISTORY  Remember to use this flags in Intent starting activity

User · Answer

There are two solutions for your case  activity A starts activity B  but you do not want to back to activity A in activity B   1  Removed previous activity A from back stack       Intent intent   new Intent activityA this  activityB class       startActivity intent       finish       Destroy activity A and not exist in Back stack   2  Disabled go back button action in activity B   There are two ways to prevent go back event as below   1  Recommend approach   Override public void onBackPressed         2 Override onKeyDown method   Override public boolean onKeyDown int keyCode  KeyEvent event        if keyCode  KeyEvent KEYCODE BACK            return false            return super onKeyDown keyCode  event       Hope that it is useful  but still depends on your situations

User · Answer

Override public void onBackPressed         When you create onBackPressed   just remove super onBackPressed   and that should work

User · Answer

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   gt       Override     public void onBackPressed             return          How can I disable   39 go back  39  to some activity     AndroidManifest xml   gt   lt activity android name   SplashActivity  android noHistory  true   gt

User · Answer

Put finish   just after   Intent i   new Intent Summary1 this MainActivity class               startActivity i   finish

User · Answer

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

User · Answer

paulsm4 s answer is the correct one  If in onBackPressed   you just return  it will disable the back button  However  I think a better approach given your use case is to flip the activity logic  i e  make your home activity the main one  check if the user is signed in there  if not  start the sign in activity  The reason is that if you override the back button in your main activity  most users will be confused when they press back and your app does nothing

User · Answer

Put  finish      immediately after     ActivityStart to stop the activity preventing any way of going back to it   Then add  onCreate        getActionBar   setDisplayHomeAsUpEnabled false               to the activity you are starting

User · Answer

Just override the onKeyDown method and check if the back button was pressed    Override public boolean onKeyDown int keyCode  KeyEvent event         if  keyCode    KeyEvent KEYCODE BACK                   Back buttons was pressed  do whatever logic you want            return false

User · Answer

This method is working fine  Intent intent   new Intent Profile this  MainActivity class    intent addFlags Intent FLAG ACTIVITY CLEAR TOP   intent addFlags Intent FLAG ACTIVITY NEW TASK    startActivity intent

User · Answer

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

User · Answer

Since there are already many great solutions suggested  ill try to give a more dipictive explanation   How to skip going back to the previous activity   Remove the previous Activity from Backstack  Simple  How to remove the previous Activity from Backstack   Call finish   method The Normal Flow   All the activities are stored in a Stack known as Backstack  When you start a new Activity startActivity       then the new Activity is pushed to top of the stack and when you press back button the Activity is popped from the stack  One key point to note is that when the back button is pressed then finish    method is called internally  This is the default behavior of onBackPressed   method  So if you want to skip Activity B   ie A lt --- C  Just add finish    method after your startActvity      in the Activity B Intent i   new Intent this  C class   startActivity i   finish

[android] How to prevent going back to the previous activity?

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