How to update listview when clicked again from another android?

Question

Hi, how to refresh listView when clicked again in another action. I use a database where I delete a specific row in one Activity , if it is pressed alone, it is not updated. When I switch to some other activity or close the application and open, it works fine where the listView updated.

Here is the code ..

 public class FragmentLiveChats extends Fragment { private AdapterLiveChat adapterChatHistory; private List<LiveChatDetails> customerDetail; private ListView mListView; private List<LiveChatDetails> list; @Override public void onViewCreated(View view, Bundle savedInstanceState) { list =AAEDatabaseHelper.getLiveChatDetails(Constants.TABLE_LIVE_CHAT); mListView = (ListView) rootView.findViewById(R.id.list_chat_history); parseResponse(); } private void parseResponse(){ for(int i=0;i<list.size();i++){ LiveChatDetails chatDetailsList = new LiveChatDetails(); chatDetailsList.setId(list.get(i).getId()); chatDetailsList.setFromUsername(list.get(i).getFromUsername()); chatDetailsList.setChatTime(list.get(i).getChatTime()); chatDetailsList.setLatMsg(list.get(i).getLatMsg()); customerDetail.add(chatDetailsList); } setValuesInAdapter(); } @Override public void onResume() { // TODO Auto-generated method stub super.onResume(); adapterChatHistory.updateList(customerDetail); adapterChatHistory.notifyDataSetChanged(); } private void setValuesInAdapter() { if (adapterChatHistory == null) { adapterChatHistory = new AdapterLiveChat(context); } adapterChatHistory.setExpertData(customerDetail); if (customerDetail != null && !customerDetail.isEmpty()) { mListView.setVisibility(View.VISIBLE); viewNoData.setVisibility(View.GONE); mListView.setAdapter(adapterChatHistory); } else { mListView.setVisibility(View.GONE); viewNoData.setVisibility(View.VISIBLE); } adapterChatHistory.notifyDataSetChanged(); mListView.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { LiveChatDetails chatDetails = (LiveChatDetails) parent.getAdapter() .getItem(position); Log.e("chatDetails", "chat details"+chatDetails.getId()); Intent intent = new Intent(context,ActivityExpertChatView.class); intent.putExtra(Constants.CHAT_USER_NAME, chatDetails.getId()); startActivity(intent); } }); } 

In the adapter:

 public void setExpertData(List<LiveChatDetails> mTempData) { this.mTempData = mTempData; } 

In ExpertChatView activity, I delete the entry, and if I come to this screen, i.e. by pressing the previous action, it still remains the same list and is not updated. But when I close the application and open it, it works fine.

In expertChatView activity, I delete the username entry.

 AAEDatabaseHelper.deleteUsername(<username>); 

I tried using the notifyDatasetChanged method in onResume() , but still the same question.

EDIT

  Adapter class public class AdapterLiveChat extends BaseAdapter { private Context context; private List<LiveChatDetails> mTempData; private LayoutInflater mInflater; private LiveChatDetails liveChatDetails; private View adView; private ViewHolder holder; private String userImageUrl; public AdapterLiveChat(Context context) { this.context = context; imgLoader = Picasso.with(context); mCalendar = Calendar.getInstance(); } public void setExpertData(List<LiveChatDetails> mTempData) { this.mTempData = mTempData; } public void updateList(List<LiveChatDetails> mChatDetails) { this.mTempData = mChatDetails; } @Override public int getCount() { return mTempData.size(); } @Override public LiveChatDetails getItem(int position) { return mTempData.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { mInflater = (LayoutInflater) context .getSystemService(Context.LAYOUT_INFLATER_SERVICE); liveChatDetails = getItem(position); adView = convertView; if (adView == null) { holder = new ViewHolder(); adView = mInflater.inflate(R.layout.row_live_chats, null); holder.txtName = (CustomTextView) adView .findViewById(R.id.txt_name); adView.setTag(holder); } else holder = (ViewHolder) adView.getTag(); holder.txtName.setText(liveChatDetails.getFromUsername()); return adView; } 

// consider the owner class here ...

Answer 1

First write below method in adapter

  public void updateList(List<Messages> mChatDetails) { this.mChatDetails.clear(); this.mChatDetails.addAll(mChatDetails) } 

To resume retrieving data from the database and calling the updateList (List mChatDetails) method, then call notifyDatasetChanged ()

  @Override public void onResume() { // fetch updated data adapter.updateList(mChatDetails); adapter.notifyDataSetChanged(); } 

Answer 2

Remove this item from the customerDetail list and then call notifydatasetchanged()

Answer 3

call the finish () in Activity1

 Intent intent = new Intent(getApplicationContext(), Activity2.class); startActivity(intent); finish(); 

In Activity2, override backPressed

 public void onBackPressed(){ Intent i = new Intent(this,AdminActivity.class); startActivity(i); }