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Thread: Android how to use adapter for listView without extending listActivity

  1. #1
    Junior Member
    Join Date
    Jun 2012
    Posts
    10

    Android how to use adapter for listView without extending listActivity

    I have an application with tabs. In one tab I need to put data (strings) in rows. To do so I chose tableLayout but when I wanted to use a contextmenu on its rows it doesn't work.

    I can show the contextmenu onLongClick but the problem is that I can't get the info about the selected row to edit or delete the selected row. Then I read in a discussion that using listView is better than tablelayout if we have many rows. But the examples I saw extend listactivity but I don't want to do this.

    So when I try working on a listView without extending listactivity I don't know how to do it what I mean is that I've never used listView before so I try different examples I found on the internet to understand it but it's not working. Here's what I did so far for the listView:
    Code:
    String [] items=getRessources().getStringArray(R.arra.resolution);
     //Resolution is an array of strings
    ListView lv=(ListeView) findViewById(R.id.listView);
    v.setAdapter(new ArrayAdapter<string>(this, android.R.layout.simple_list_item_1, items);
    When I compile it I get a list with elements of my array in it but first, I want to change the color of text which I can't. And secondly I want to add rows dynamically to the list which I don't know how to do either. I think I have to use an adapter to do it but I don't know how. Can someone please guide me through this. I just want to know how to attach my list to an adapter which'll allow me to dynamically add rows, add contextMenu etc.

  2. #2
    Junior Member
    Join Date
    Jun 2012
    Posts
    13
    main Activity class:
    Code:
    import java.util.ArrayList;
    import android.app.Activity;
    import android.os.Bundle;
    import android.view.View;
    import android.widget.AdapterView;
    import android.widget.AdapterView.OnItemClickListener;
    import android.widget.Button;
    import android.widget.ListView;
    
    public class SelectedActivity extends Activity {
    
    private SelectedAdapter selectedAdapter;
    private ArrayList<String> list;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.selected_example);
    
        // populate the model - a simple a list
        list = new ArrayList<String>();
        list.add("Apple");
        list.add("Orange");
        list.add("Grape");
        list.add("Grape1");
        list.add("Grape2");
        list.add("Grape3");
        list.add("Grape4");
        list.add("Grape5");
        list.add("Grape6");
    
        // create our SelectedAdapter
        selectedAdapter = new SelectedAdapter(this,0,list);
        selectedAdapter.setNotifyOnChange(true);
    
        ListView listview = (ListView) findViewById(R.id.listExample);
        listview.setAdapter(selectedAdapter);
    
        listview.setOnItemClickListener(new OnItemClickListener() {
            //@Override
            public void onItemClick(AdapterView arg0, View view,
                                           int position, long id) {
                // user clicked a list item, make it "selected"
                selectedAdapter.setSelectedPosition(position);
            }
        });
    }
    Adapter class:
    Code:
       import java.util.List;
        import android.content.Context;
        import android.graphics.Color;
        import android.view.LayoutInflater;
        import android.view.View;
        import android.view.ViewGroup;
        import android.widget.ArrayAdapter;
        import android.widget.Button;
        import android.widget.TextView;
    
        public class SelectedAdapter extends ArrayAdapter{
    
            // used to keep selected position in ListView
            private int selectedPos = -1;   // init value for not-selected
    
            public SelectedAdapter(Context context, int textViewResourceId,
                           List objects) {
                 super(context, textViewResourceId, objects);
            }
            public void setSelectedPosition(int pos){
            selectedPos = pos;
                 // inform the view of this change
                 notifyDataSetChanged();
            }
            public int getSelectedPosition(){
                 return selectedPos;
            }
            @Override
            public View getView(int position, View convertView, ViewGroup parent) {
                     View v = convertView;
                     // only inflate the view if it's null
                     // if (v == null) {
                            LayoutInflater vi =   (LayoutInflater)this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                            v = vi.inflate(R.layout.selected_row, null);
                     //  }
    
                     // get text view
                         TextView label = (TextView)v.findViewById(R.id.txtExample);
                         Button btn=(Button)v.findViewById(R.id.btn1);
    
                         // change the row color based on selected state
                         if(selectedPos == position){
                            label.setBackgroundColor(Color.CYAN);
                            btn.setBackgroundResource(R.drawable.next);
                         }
                         else{
                            label.setBackgroundColor(Color.WHITE);
                         }
    
                         label.setText(this.getItem(position).toString());       
                         return(v);
            }
    }

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