Clash Royale CLAN TAG#URR8PPP

Add list to ArrayList<String> and show on ListView

I want to make a ListView from the time that I get from a TimePicker'
I succeed to add the time into a variable.
but when I'm trying to add them into the ListView I don't get anything.

addArray = new ArrayList<String>();
ArrayAdapter<String> adapter = new ArrayAdapter(chart_houres_cosher.this,android.R.layout.simple_list_item_1,addArray);
ListView listView = (ListView) findViewById(R.id.leassons);
listView.setAdapter(adapter);


Clicked button

textView.setText( firstHouer + " : " + firstdMinute + " - " + seccoundHouer + " : " + seccoundMinute );
addArray.add(firstHouer + " : " + firstdMinute + " - " + seccoundHouer + " : " + seccoundMinute);


I can see the outcome on the TextView but not on the ListView.

2 Answers
2

Once you change the data of adapter you have to invoke notifyDataSetChanged() to see the effects in the list view.

notifyDataSetChanged()

textView.setText( firstHouer + " : " + firstdMinute + " - " + seccoundHouer + " : " + seccoundMinute );
addArray.add(firstHouer + " : " + firstdMinute + " - " + seccoundHouer + " : " + seccoundMinute);
addArray.notifyDataSetChanged();
//^^^^^^^^^^^^^^^^^^^
// once adapter is linked and later data source is modified , notify it
// only then adapter go though the data source
//and update the listView/RecyclerView accordingly


addArray.add()

addArray.add(textView.getText())

setText()

setText()

add()

And where is your data? From your code you are trying to add an empty Array.

addArray = new ArrayList<String>();


You just declare addArray, it dosen't have any data in it. And you are adding empty array into ListView.

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