Clear listview content

Question

I have a little problem with ListView  How do I clear a ListView content  knowing that it has a custom adapter   edit - the custom adapter class extends BaseAdapter  it looks like this   import android app Activity  import android content Context  import android view LayoutInflater  import android view View  import android view ViewGroup  import android widget BaseAdapter  import android widget TextView   public class MyAdapter extends BaseAdapter        private Activity activity      private String   data      private static LayoutInflater inflater   null       public MyAdapter Activity a  String   str            activity   a          data   str          inflater    LayoutInflater  activity getSystemService Context LAYOUT INFLATER SERVICE              public static class ViewHolder           public TextView text              Override     public int getCount             return data length              Override     public Object getItem int position            return position              Override     public long getItemId int position            return position              Override     public View getView int position  View view  ViewGroup parent            View v   view          ViewHolder holder          if  v    null                v   inflater inflate R layout rowa  null               holder   new ViewHolder                holder text  v findViewById R id dexter               v setTag holder             else               holder   v getTag                       holder text setText data position             return v

User · Answer

It s simple  First you should clear your collection and after clear list like this code     yourCollection clear     setListAdapter null

User · Answer

Remove your items from your custom adapter and call notifyDataSetChanged

User · Answer

You need to call both clear   from ArrayAdapter and notifyDataSetChanged   both   Below is link  click

User · Answer

As of Android versions M and N  following works for me and would be the correct approach  Emptying the ListView or setting the Adapter to null is not the right approach and would lead to null pointer issue  invalid ListView and or crash of the app   Simply do       mList clear        mAdapter notifyDataSetChanged      i e  first you clear the list altogether  and then let the adapter know about this change  Android will take care of correctly updating the UI with an empty list  In my case  my list is an ArrayList   In case you are doing this operation from a different thread  run this code on the UI thread       runOnUiThread mRunnable     Where mRunnable would be       Runnable mRunnable   new Runnable             public void run                 mList clear                mAdapter notifyDataSetChanged

User · Answer

Just put the code ListView Items Clear    on your method

User · Answer

Call clear   method from your custom adapter

User · Answer

Simple its works me    YourArrayList Object clear

User · Answer

Simply write  listView setAdapter null

User · Answer

I guess you passed a List or an Array to the Adapter  If you keep the instance of this added collection  you can do a   collection clear    listview getAdapter   notifyDataSetChanged      this ll work only if you instantiated the adapter with collection and it s the same instance   Also  depending on the Adapter you extended  you may not be able to do this  SimpleAdapter is used for static data  thus it can t be updated after creation   PS  not all Adapters have a clear   method  ArrayAdapter does  but ListAdapter or SimpleAdapter don t

User · Answer

There is a solution for the duplicate entry in listview  You have to declare the onBackPress  -method on your activity and write down the highlight code given below      Override public void onBackPressed            TODO Auto-generated method stub     super onBackPressed                attendence webdata clear    list setAdapter null       --------------------------------------------------

[android] Clear listview content?

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