CODEWITHSUNDEEP
androidandroid-layoutandroid-listview
Nowak Florent
Nowak Florent

Reputation: 13

Android: fill a listview with an object

I am wondering if it is possible to put a list of TextView inside a Listview in Android. I tried this code but the result does not give me the right text wanted. I want to display 20 toto for testing.

Here my Main.class

public class MainActivity extends Activity {

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

    listview = (ListView) findViewById(R.id.listcontacts);

    // Instanciating an array list (you don't need to do this, 
    // you already have yours).
    List<TextView> contacts = new ArrayList<TextView>();
    for(int i = 0 ; i< 20; i++)
    {
        TextView toto = new TextView(this);
        toto.setText("toto");
        contacts.add(toto);

    }

    // This is the array adapter, it takes the context of the activity as a 
    // first parameter, the type of list view as a second parameter and your 
    // array as a third parameter.
    ArrayAdapter<TextView> arrayAdapter = new ArrayAdapter<TextView>(
            this, 
            android.R.layout.simple_list_item_1,
            contacts );

    listview.setAdapter(arrayAdapter); 
}

Then the XML file of main 

 <ListView
        android:id="@+id/listcontacts"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >

 </ListView>

Should I need to create a TextView inside my listview and call "findViewById(TextView)" in my class?

Thanks.

Upvotes: 1

Views: 76

Answers (5)

Nowak Florent
Nowak Florent

Reputation: 13

Thank you all for your answers. I found something on internet and tested it. This is exactly I want to do.

"Using a Custom ArrayAdapter" is the solution I use.

https://github.com/codepath/android_guides/wiki/Using-an-ArrayAdapter-with-ListView

In this they create a model with 2 String data. Then create the template xml you want to show. And create you adapter to fill data. Fill data.

Upvotes: 0

Maycon Cardoso
Maycon Cardoso

Reputation: 179

you can create a custom adapter. Or use an String adapter.

List<String> list = new ArrayList<String>();
for(int i = 0; i < 20; i++){
   list.add("toto");
}

listview.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, list);

Upvotes: 0

Lamorak
Lamorak

Reputation: 11137

You don't have to create the TextViews the adapter does that for you. Just create 

List<String> contacts = new ArrayList<String>(20);
for(int i = 0 ; i< 20; i++) {
    contacts.add("toto");
}

And call 

ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(
        this, 
        android.R.layout.simple_list_item_1,
        contacts );

Upvotes: 0

rcorbellini
rcorbellini

Reputation: 1337

Just change your Array of TextView for Strings:

remove:

  List<TextView> contacts = new ArrayList<TextView>();
    for(int i = 0 ; i< 20; i++)
    {
        TextView toto = new TextView(this);
        toto.setText("toto");
        contacts.add(toto);

    }

and: 

ArrayAdapter<TextView> arrayAdapter = new ArrayAdapter<TextView>(
        this, 
        android.R.layout.simple_list_item_1,
        contacts );

add: 

List<String> contacts = new ArrayList<String>();
    for(int i = 0 ; i< 20; i++)
    {
        contacts.add("toto");

    }

and:

  ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(
                this, 
                android.R.layout.simple_list_item_1,
                contacts );

Upvotes: 0

Blackbelt
Blackbelt

Reputation: 157437

Should I need to create a TextView inside my listview and call "findViewById(TextView)" in my class?

No you shouldn't. The Adapter is responsible to adapt your dataset to some sort of visualization. ArrayAdapter, for instance, is using the TextView contained into simple_list_item_1.xml. In your case, contacts, should be an ArrayList<String> and the adapter should Adapter<String>

Upvotes: 1

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