ArrayList<MyClass> myList = new ArrayList<MyClass>(); ListView listView = (ListView) findViewById(R.id.list); ArrayAdapter<MyClass> adapter = new ArrayAdapter<MyClass>(this, R.layout.row, to, myList.); listView.setAdapter(adapter); class MyClass { public String reason; public long long_val; } I have created row.xml in layouts, but don't know how to show both reason and long_val in the ListView using ArrayAdapter.
Implement custom adapter for your class:
public class MyClassAdapter extends ArrayAdapter<MyClass> { private static class ViewHolder { private TextView itemView; } public MyClassAdapter(Context context, int textViewResourceId, ArrayList<MyClass> items) { super(context, textViewResourceId, items); } public View getView(int position, View convertView, ViewGroup parent) { if (convertView == null) { convertView = LayoutInflater.from(this.getContext()) .inflate(R.layout.listview_association, parent, false); viewHolder = new ViewHolder(); viewHolder.itemView = (TextView) convertView.findViewById(R.id.ItemView); convertView.setTag(viewHolder); } else { viewHolder = (ViewHolder) convertView.getTag(); } MyClass item = getItem(position); if (item!= null) { // My layout has only one TextView // do whatever you want with your string and long viewHolder.itemView.setText(String.format("%s %d", item.reason, item.long_val)); } return convertView; } } For those not very familiar with the Android framework, this is explained in better detail here: https://github.com/codepath/android_guides/wiki/Using-an-ArrayAdapter-with-ListView.
textViewResourceId isn't used above?
You could just add a toString() method to MyClass, per http://developer.android.com/reference/android/widget/ArrayAdapter.html:
However the TextView is referenced, it will be filled with the toString() of each object in the array. You can add lists or arrays of custom objects. Override the toString() method of your objects to determine what text will be displayed for the item in the list.
class MyClass { @Override public String toString() { return "Hello, world."; } } 
MyClass, you wil have to refactor. Finally, it's generally a bad idea to tie presentation logic to your models. Models should not be aware of how they are presented to the user.
MyClass would require you to add a dedicated class called MyClassView which wraps the underlying model (and provides the toString( ) implementation
I think this is the best approach. Using generic ArrayAdapter class and extends your own Object adapter is as simple as follows:
public abstract class GenericArrayAdapter<T> extends ArrayAdapter<T> { // Vars private LayoutInflater mInflater; public GenericArrayAdapter(Context context, ArrayList<T> objects) { super(context, 0, objects); init(context); } // Headers public abstract void drawText(TextView textView, T object); private void init(Context context) { this.mInflater = LayoutInflater.from(context); } @Override public View getView(int position, View convertView, ViewGroup parent) { final ViewHolder vh; if (convertView == null) { convertView = mInflater.inflate(android.R.layout.simple_list_item_1, parent, false); vh = new ViewHolder(convertView); convertView.setTag(vh); } else { vh = (ViewHolder) convertView.getTag(); } drawText(vh.textView, getItem(position)); return convertView; } static class ViewHolder { TextView textView; private ViewHolder(View rootView) { textView = (TextView) rootView.findViewById(android.R.id.text1); } } } and here your adapter (example):
public class SizeArrayAdapter extends GenericArrayAdapter<Size> { public SizeArrayAdapter(Context context, ArrayList<Size> objects) { super(context, objects); } @Override public void drawText(TextView textView, Size object) { textView.setText(object.getName()); } } and finally, how to initialize it:
ArrayList<Size> sizes = getArguments().getParcelableArrayList(Constants.ARG_PRODUCT_SIZES); SizeArrayAdapter sizeArrayAdapter = new SizeArrayAdapter(getActivity(), sizes); listView.setAdapter(sizeArrayAdapter); I've created a Gist with TextView layout gravity customizable ArrayAdapter:
Subclass the ArrayAdapter and override the method getView() to return your own view that contains the contents that you want to display.
Here's a quick and dirty example of how to use an ArrayAdapter if you don't want to bother yourself with extending the mother class:
class MyClass extends Activity { private ArrayAdapter<String> mAdapter = null; @Override protected void onCreate(Bundle savedInstanceState) { mAdapter = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_dropdown_item_1line, android.R.id.text1); final ListView list = (ListView) findViewById(R.id.list); list.setAdapter(mAdapter); //Add Some Items in your list: for (int i = 1; i <= 10; i++) { mAdapter.add("Item " + i); } // And if you want selection feedback: list.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { //Do whatever you want with the selected item Log.d(TAG, mAdapter.getItem(position) + " has been selected!"); } }); } } 