How to handle back button in activity

Question

How to handle a back button in an activity  I have some buttons  If I click one of the button it s redirecting to the buttons which I required  It s working fine but When I press back button it gets finished   How to solve this problem  I have only one activity for all those buttons  Thanks in advance    Override public boolean onKeyDown int keyCode  KeyEvent event         if   keyCode    KeyEvent KEYCODE BACK                  return false    I have tried here true also           return super onKeyDown keyCode  event       I have used above code to handle back button but its not working  When I press back button its struck there itself

User · Answer

This helped me      Override public void onBackPressed         startActivity new Intent currentActivity this  LastActivity class        finish        OR       even you can use this for drawer toggle also   Override public void onBackPressed         DrawerLayout drawer    DrawerLayout  findViewById R id drawer layout       if  drawer isDrawerOpen GravityCompat START             drawer closeDrawer GravityCompat START         else           super onBackPressed                  startActivity new Intent currentActivity this  LastActivity class        finish         I hope this would help you

User · Answer

A simpler approach is to capture the Back button press and call moveTaskToBack true  as follows    Override public boolean onKeyDown int keyCode  KeyEvent event        if  keyCode    KeyEvent KEYCODE BACK            moveTaskToBack true           return true            return super onKeyDown keyCode  event       Android 2 0 introduced a new onBackPressed method  and these recommendations on how to handle the Back button

User · Answer

This is a simple way of doing something        Override         public void onBackPressed                    do what you want to do when the  back  button is pressed              startActivity new Intent Activity this  MainActivity class                finish                I think there might be more elaborate ways of going about it  but I like simplicity  For example  I used the template above to make the user sign out of the application AND THEN go back to another activity of my choosing

User · Answer

You can handle it like this    for API level 5 and greater   Override public void onBackPressed            your code      older than API 5   Override public boolean onKeyDown int keyCode  KeyEvent event        if  keyCode    KeyEvent KEYCODE BACK               your code         return true             return super onKeyDown keyCode  event

User · Answer

You should use    Override public boolean onKeyDown int keyCode  KeyEvent event         if  android os Build VERSION SDK INT  lt  android os Build VERSION CODES ECLAIR              amp  amp  keyCode    KeyEvent KEYCODE BACK              amp  amp  event getRepeatCount      0               Take care of calling this method on earlier versions of            the platform where it doesn t exist          onBackPressed               return super onKeyDown keyCode  event       Override public void onBackPressed            This will be called either automatically for you on 2 0        or later  or by the code above on earlier versions of the        platform      return      As defined here  http   android-developers blogspot com 2009 12 back-and-other-hard-keys-three-stories html  If you are using an older version to compile the code  replace android os Build VERSION CODES ECLAIR by 5  you can add a private int named ECLAIR for example

User · Answer

In addition to the above I personally recommend  onKeyUp      Programatically Speaking keydown will fire when the user depresses a key initially but It will repeat while the user keeps the key depressed     This remains true for all development platforms   Google development suggested that if you are intercepting the BACK button in a view you should track the KeyEvent with starttracking on keydown then invoke with keyup    public boolean onKeyDown int keyCode  KeyEvent event        if  keyCode    KeyEvent KEYCODE BACK              amp  amp  event getRepeatCount      0            event startTracking            return true            return super onKeyDown keyCode  event      public boolean onKeyUp int keyCode  KeyEvent event        if  keyCode    KeyEvent KEYCODE BACK  amp  amp  event isTracking                amp  amp   event isCanceled                     Your Code             return true            return super onKeyUp keyCode  event

User · Answer

For both hardware device back button and soft home  back  button e g     lt -    this is what works for me    Note I have an app bar    toolbar in the activity    Override public boolean onOptionsItemSelected MenuItem item        switch  item getItemId              case android R id home                finish                onBackPressed                break            return true        Override public void onBackPressed          Execute your code here    finish         Cheers

[android] How to handle back button in activity

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