How to implement the Android ActionBar back button

Question

I have an activity with a listview  When the user click the item  the item  viewer  opens   List1 setOnItemClickListener new OnItemClickListener          Override     public void onItemClick AdapterView lt   gt  arg0  View arg1  int arg2 long arg3             Intent nextScreen   new Intent context ServicesViewActivity class           String   Service    String   List1 getItemAtPosition arg2              Sending data to another Activity         nextScreen putExtra  data   datainfo           startActivityForResult nextScreen 0           overridePendingTransition R anim right enter  R anim left exit               This works fine  but on the actionbar the back arrow next to the app icon doesn t get activated  Am I missing something

User · Answer

Android Annotations   OptionsItem android R id home  void homeSelected         onBackPressed       Source  https   github com excilys androidannotations

User · Answer

https   stackoverflow com a 46903870 4489222  To achieved this  there are simply two steps   Step 1  Go to AndroidManifest xml and in the add the parameter in tag - android parentActivityName   home HomeActivity   example      lt activity     android name   home ActivityDetail      android parentActivityName   home HomeActivity      android screenOrientation  portrait    gt    Step 2  in ActivityDetail add your action for previous page activity  example     Override public boolean onOptionsItemSelected MenuItem item       switch  item getItemId            case android R id home             onBackPressed              return true          return super onOptionsItemSelected item

User · Answer

Following Steps are much enough to back button   Step 1  This code should be in Manifest xml    lt activity android name   activity ChildActivity          android parentActivityName   activity ParentActivity          android screenOrientation  portrait  gt           lt meta-data             android name  android support PARENT ACTIVITY              android value   activity ParentActivity    gt  lt  activity gt    Step 2  You won t give   finish      in your Parent Activity while starting Child Activity   Step 3  If you need to come back to Parent Activity from Child Activity  Then you just give this code for Child Activity   startActivity new Intent ParentActivity this  ChildActivity class

User · Answer

To enable the ActionBar back button you obviously need an ActionBar in your Activity  This is set by the theme you are using  You can set the theme for your Activity in the AndroidManfiest xml  If you are using e g the  android style Theme NoTitleBar theme  you don t have an ActionBar  In this case the call to getActionBar   will return null  So make sure you have an ActionBar first  The next step is to set the android parentActivityName to the activity you want to navigate if you press the back button  This should be done in the AndroidManifest xml too  Now you can enable the back button in the onCreate method of your  quot child quot  activity   Override protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState       getActionBar   setDisplayHomeAsUpEnabled true      Now you should implement the logic for the back button  You simply override the onOptionsItemSelected method in your  quot child quot  activity and check for the id of the back button which is android R id home  Now you can fire the method NavUtils navigateUpFromSameTask this   BUT if you don t have specified the android parentActivityName in you AndroidManifest xml this will crash your app  Sometimes this is what you want because it is reminding you that you forgot  quot something quot   So if you want to prevent this  you can check if your activity has a parent using the getParentActivityIntent   method  If this returns null  you don t have specified the parent  In this case you can fire the onBackPressed   method that does basically the same as if the user would press the back button on the device  A good implementation that never crashes your app would be   Override public boolean onOptionsItemSelected MenuItem item        switch  item getItemId              case android R id home              if  getParentActivityIntent      null                    Log i TAG   quot You have forgotten to specify the parentActivityName in the AndroidManifest  quot                    onBackPressed                  else                   NavUtils navigateUpFromSameTask this                             return true          default              return super onOptionsItemSelected item            Please notice that the animation that the user sees is different between NavUtils navigateUpFromSameTask this   and onBackPressed    It is up to you which road you take  but I found the solution helpful  especially if you use a base class for all of your activities

User · Answer

getSupportActionBar   setDisplayHomeAsUpEnabled true     in onCreated method for the new apis

User · Answer

I think onSupportNavigateUp   is simplest and best way to do so  check the code in this link Click here for complete code

User · Answer

In the OnCreate method add this   if  getSupportActionBar      null                getSupportActionBar   setDisplayHomeAsUpEnabled true           Then add this method    Override public boolean onSupportNavigateUp         onBackPressed        return true

User · Answer

Selvin already posted the right answer  Here  the solution in pretty code   public class ServicesViewActivity extends Activity        Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState              etc            getActionBar   setDisplayHomeAsUpEnabled true               Override     public boolean onOptionsItemSelected MenuItem item            switch  item getItemId              case android R id home              NavUtils navigateUpFromSameTask this               return true          default              return super onOptionsItemSelected item                       The function NavUtils navigateUpFromSameTask this  requires you to define the parent activity in the AndroidManifest xml file   lt activity android name  com example ServicesViewActivity   gt       lt meta-data      android name  android support PARENT ACTIVITY       android value  com example ParentActivity    gt   lt  activity gt    See here for further reading

User · Answer

AndroidManifest file                                                                               lt activity android name   activity DetailsActivity  gt           lt meta-data             android name  android support PARENT ACTIVITY              android value  br com halyson materialdesign activity HomeActivity    gt       lt  activity gt    add in DetailsActivity   protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState          Toolbar toolbar    Toolbar  findViewById R id toolbar       setSupportActionBar toolbar       getSupportActionBar   setDisplayHomeAsUpEnabled true       it s work

User · Answer

Building on Jared s answer  I had to enable and implement the action bar back button behavior in several activities and created this helper class to reduce code duplication   public final class ActionBarHelper       public static void enableBackButton AppCompatActivity context            if context    null  return           ActionBar actionBar   context getSupportActionBar            if  actionBar    null  return           actionBar setDisplayHomeAsUpEnabled true             Usage in an activity    Override protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState                ActionBarHelper enableBackButton this

User · Answer

If you are using Toolbar  I was facing the same issue  I solved by following these two steps   In the AndroidManifest xml    lt activity android name   activity SecondActivity  android parentActivityName   activity MainActivity   gt     In the SecondActivity  add these      Toolbar toolbar   findViewById R id second toolbar   setSupportActionBar toolbar   getSupportActionBar   setDisplayShowTitleEnabled false   getSupportActionBar   setDisplayHomeAsUpEnabled true

User · Answer

Make sure your the ActionBar Home Button is enabled in the Activity   Android  API 5     Override public void onBackPressed                   super onBackPressed        ActionBarSherlock and App-Compat  API 7     Override public void onCreate  Nullable Bundle savedInstanceState                getSupportActionBar   setDisplayHomeAsUpEnabled true       Android  API 11     Override public void onCreate  Nullable Bundle savedInstanceState                getActionBar   setDisplayHomeAsUpEnabled true       Example MainActivity that extends ActionBarActivity   public class MainActivity extends ActionBarActivity        Override     public void onCreate  Nullable Bundle savedInstanceState            super onCreate savedInstanceState              Back button         getSupportActionBar   setDisplayHomeAsUpEnabled true               Override     public boolean onOptionsItemSelected MenuItem item            switch  item getItemId              case android R id home                  API 5  solution             onBackPressed                return true           default              return super onOptionsItemSelected item                       This way all the activities you want can have the backpress   Android  API 16    http   developer android com training implementing-navigation ancestral html  AndroidManifest xml    lt application      gt               lt  -- The main home activity  it has no parent activity  -- gt       lt activity         android name  com example myfirstapp MainActivity      gt                   lt  activity gt       lt  -- A child of the main activity -- gt       lt activity         android name  com example myfirstapp DisplayMessageActivity          android label   string title activity display message          android parentActivityName  com example myfirstapp MainActivity   gt           lt  -- The meta-data element is needed for versions lower than 4 1 -- gt           lt meta-data             android name  android support PARENT ACTIVITY              android value  com example myfirstapp MainActivity    gt       lt  activity gt   lt  application gt    Example MainActivity that extends ActionBarActivity   public class MainActivity extends ActionBarActivity        Override     public void onCreate  Nullable Bundle savedInstanceState            super onCreate savedInstanceState              Back button         getSupportActionBar   setDisplayHomeAsUpEnabled true               Override     public boolean onOptionsItemSelected MenuItem item            switch  item getItemId                 Respond to the action bar s Up Home button         case android R id home              NavUtils navigateUpFromSameTask this               return true                    return super onOptionsItemSelected item

[java] How to implement the Android ActionBar back button?

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