android,loops,listview,items , Android : loop through all items in a listview


Android : loop through all items in a listview

Question:

Tag: android,loops,listview,items

Want to get quick answer how to list all items on my listview, in order to print out a list or share to a notepad app etc. That is, to get a variable with following information from the listview: "apple", "banana", "orange". Below is my listview. Thanks

    String[] values = new String[] { "apple", "banana", "orange" };

    listItems = new ArrayList<String>();
    for (int i = 0; i < values.length; ++i) {
        listItems.add(values[i]);
    }

    adapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_list_item_1, android.R.id.text1,
            listItems);

    // Assign adapter to ListView
    listView.setAdapter(adapter);

Answer:

Your question says,

Loop through all items in a listview.

I understand from your code that you want to add the items from String array to ArrayList.

But, you can pass String array directly as a third parameter to your ArrayAdapter.

Look at the suggestions provided by Android studio for ArrayAdapter. You can pass String[] or ArrayList too :

enter image description here

Either you can pass String[] or if you wanted to loop through all String[] items to ArrayList, you can simply do by a single line.

    Collections.addAll(arrayList,values);

arrayList - ArrayList

values - String[]

instead of,

    listItems = new ArrayList<String>();
    for (int i = 0; i < values.length; ++i) {
        listItems.add(values[i]);
    }

And in comment section, you said

I think I may add/remove item at a time to the listView later.

In this case, you can have some button to reload the list to show the old items + added new items or to show the list except the items which you've deleted. I'll add below how you have to achieve it.

Have a button AddMore in your layout and whenever you want to add new items, then do like this

button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                arrayList.add("lemon"); // this adds item lemon to arraylist
                arrayList.add("Pomgranete");
                arrayAdapter.notifyDataSetChanged(); // this will refresh the listview and shows the newly added items too
            }
        });

You can delete the item similarly by passing the position of the item in arrayList,

      arrayList.remove(arrayList.get(i)); // i is the position & note arrayList starts from 0

So, by summing up everything, here's the full working code :

public class MainActivity extends AppCompatActivity {

    ListView listView;
    String[] values = {"Apple", "Orange", "Banana"};
    List<String> arrayList;
    Button button;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        listView = (ListView)findViewById(R.id.listView);
        button = (Button)findViewById(R.id.button);
        arrayList = new ArrayList<String>();

        Collections.addAll(arrayList,values); // here you're copying all items from String[] to ArrayList

        final ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,arrayList);
        listView.setAdapter(arrayAdapter);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                arrayList.remove(arrayList.get(2)); // here i remove banana since it's position is two. My ordering of items is different so it removed banana. If i use ordering from your quest, it will remove orange.
                arrayList.add("lemon"); // adding lemon to list
                arrayList.add("Pomgranete"); // adding pomgranete
                arrayAdapter.notifyDataSetChanged(); // this used to refresh the listView
            }
        });

     }
    }

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent"  tools:context=".MainActivity">

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="ADD MORE"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:id="@+id/button" />

    <ListView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/listView"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_above="@+id/button" />


</RelativeLayout>

Output :

List with pre-defined 3 items and one button to load more items.

enter image description here

List with old 3 items + newly added 2 items (Here i didn't use arrayList.remove)

enter image description here

List with old items except deleted item + newly added 2 items (Here i used arrayList.remove to remove banana by arrayList.remove(arrayList.get(2));)

enter image description here


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