Back button and refreshing previous activity

Question

If we have two activities    List of files and last modified time File editing activity   A user selects a file from the list and is taken to the file editing activity  When done editing  the user presses the back button to return to the file list   The list is not reloaded and therefore an incorrect value is displayed for the just edited files modified time   What is the proper method of causing the file list to refresh after the back button is pressed    This example assumes that no database is being used  just an ArrayAdapter

User · Answer

If you want to refresh previous activity, this solution should work:

In previous activity where you want to refresh:

@Override
public void onRestart()
{
    super.onRestart();
    // do some stuff here
}

User · Answer

One option would be to use the onResume of your first activity    Override public void onResume             After a pause OR at startup     super onResume          Refresh your stuff here          Or you can start Activity for Result   Intent i   new Intent this  SecondActivity class   startActivityForResult i  1     In secondActivity if you want to send back data    Intent returnIntent   new Intent     returnIntent putExtra  result  result    setResult RESULT OK returnIntent         finish      if you don t want to return data   Intent returnIntent   new Intent    setResult RESULT CANCELED  returnIntent           finish      Now in your FirstActivity class write following code for onActivityResult   method  protected void onActivityResult int requestCode  int resultCode  Intent data       if  requestCode    1          if resultCode    RESULT OK                    Update List                      if  resultCode    RESULT CANCELED                   Do nothing                onActivityResult

User · Answer

I would recommend overriding the onResume   method in activity number 1  and in there include code to refresh your array adapter  this is done by using  yourListViewAdapater  notifyDataSetChanged     Read this if you are having trouble refreshing the list  Android List view refresh

User · Answer

The think best way to to it is using   Intent i   new Intent this myActivity  SecondActivity class    startActivityForResult i  1

User · Answer

I think onRestart   works better for this     Override public void onRestart          super onRestart          When BACK BUTTON is pressed  the activity on the stack is restarted       Do what you want on the refresh procedure here     You could code what you want to do when the Activity is restarted  called again from the event  back button pressed   inside onRestart      For example  if you want to do the same thing you do in onCreate    paste the code in onRestart    eg  reconstructing the UI with the updated values

User · Answer

Override public void onBackPressed         Intent intent   new Intent this DesiredActivity class       startActivity intent       super onBackPressed

User · Answer

private Cursor getAllFavorites         return mDb query DocsDsctnContract DocsDsctnEntry Description Table Name              null              null              null              null              null              DocsDsctnContract DocsDsctnEntry COLUMN Timest      Override public void onResume         After a pause OR at startup     super onResume        mAdapter swapCursor getAllFavorites         mAdapter notifyDataSetChanged        public void swapCursor Cursor newCursor       if  mCursor  null  mCursor close        mCursor   newCursor      if  newCursor    null           mAdapter notifyDataSetChanged              I just have favorites category so when i click to the item from favorites there appear such information and if i unlike it - this item should be deleted from Favorites   for that i refresh database and set it to adapter for recyclerview  I wish you will understand my problem  amp  solution

User · Answer

Try This   public void refreshActivity         Intent i   new Intent this  MainActivity class       i addFlags Intent FLAG ACTIVITY CLEAR TOP       startActivity i       finish         or in Fragment    public void refreshActivity         Intent i   new Intent getActivity    MainActivity class       i addFlags Intent FLAG ACTIVITY CLEAR TOP       startActivity i       finish         And Add this method to your onBackPressed   like     Override public void onBackPressed                   refreshActivity            super onBackPressed              Thats It

User · Answer

If not handling a callback from the editing activity  with onActivityResult   then I d rather put the logic you mentioned in onStart  or possibly in onRestart   since having it in onResume just seems like overkill  given that changes are only occurring after onStop   At any rate  be familiar with the Activity lifecycle   Plus  take note of the onRestoreInstanceState and onSaveInstanceState methods  which do not appear in the pretty lifecycle diagram    Also  it s worth reviewing how the Notepad Tutorial handles what you re doing  though it does use a database

User · Answer

in main    Override public void onRestart         super onRestart        finish        startActivity getIntent

User · Answer

Override protected void onRestart         super onRestart        finish        overridePendingTransition 0  0       startActivity getIntent         overridePendingTransition 0  0       In previous activity use this code  This will do a smooth transition and reload the activity when you come back by pressing back button

[android] Back button and refreshing previous activity

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