CODEWITHSUNDEEP
androidlistview
hari
hari

Reputation: 11

How to avoid the clearing of listview while switching between one activity to another activity

I am using a an adapter function which will view the current location in the list view.

The list view is working fine, my problem is while switching to another activity and returning to the same activity my list is clear and it's starting from first what can I do for.Thanks in advance.

The below code is my Intent activity. From this only I have switched between two activities.

My adapter is

Adapter = new MyTrip_listview_Adapter(MyTrip.this, location, Date_Array, imagesview, j, context, arrayplaces);
listViewplace.setAdapter(adapter);
listViewplace.setSelection(location.size() - 1);
adapter.notifyDataSetChanged();

The below code is my Intent activity. From this only I have switch between two activity.

Here how can do the activity switching

home_lay.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        popupWindow.dismiss();
    }
});
trips_lay.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        Intent home_btn = new Intent(MyTrip.this, Trips_visited.class);
        startActivity(home_btn);
    }
});
notifi_lay.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        Intent home_btn = new Intent(MyTrip.this, Notification_from_friends.class);
        startActivity (home_btn);
    }
});
sett_lay.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {

    }
});

Upvotes: 0

Views: 118

Answers (2)

Justin Yang
Justin Yang

Reputation: 41

when you call another activity, u could set a flag on that intent so that it has multiple tasks.

Intent home_btn = new Intent(MyTrip.this, Trips_visited.class);
intent.setFlags(Intent.FLAG_ACTIVITY_MULTIPLE_TASK);
startActivity(home_btn);

If you want to go back to the activity with listview when u exit the app. You'd have to catch the back press.

you could override onkeydown and also add moveTaskToBack(true)

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK) {

                moveTaskToBack(true);

            return true;
        }
    }
    return super.onKeyDown(keyCode, event);
}

add this to your first activity.

Upvotes: 0

Lior Iluz
Lior Iluz

Reputation: 26573

I'm not sure where you put the Adapter code, it seems like you put it in onResume/onStart or something.

Just use this:

if (adapter == null) {
    adapter = new MyTrip_listview_Adapter(MyTrip.this, location, Date_Array, imagesview, j, context, arrayplaces);
    listViewplace.setAdapter(adapter); 
    listViewplace.setSelection(location.size() - 1); 
} else {
    adapter.notifyDataSetChanged();
}

Upvotes: 1

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