Using listview in android

Question

I am making an android application that needs to use a ListView. I want to add a menubutton that says "Add to list" and once the user presses that menubutton, it pops up a popupwindow containing a TextView, EditText and two Buttons, "Ok" and "Cancel". Once the user presses "Ok", the text inside the EditText should be added to the ListView. And the cancel Button is obvious. I also want to be able to long press on a ListView item to open a popupwindow containing a delete Button. I want to design the ListView screen using XML. How can i make this possible??? Please help me and thanks SO much in advance! I am using this code so far:

ListView activity:

public class NotesActivity extends ListActivity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
}

Main screen XML:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/background"
android:orientation="vertical" >








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

</ListView>

</LinearLayout>

Answer 1

1. You have to create a layout containing a listView.

2. You have to create an xml lyout corresponding to one row of your list view.

3. You have to create an adapter which will populate data to insert in your listView

4. You have to create an onClickListener on your button to add data in your list

5. If you are using an ArrayAdapter or a CursorAdapter, add the new item you created to the list or the cursor used by your adapter and (notifyDataSetChanged() is automatically called), so your adapter will update the listview

Source : http://developer.android.com/resources/tutorials/views/hello-listview.html

Previous topic on it : Dynamic ListView in Android app

Answer 2

more details:- http://www.listviewinandroid.blogspot.in/

   public class SimpleListViewActivity extends Activity {

  private ListView mainListView ;


  private ArrayAdapter<String> listAdapter ;

  public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

// Find the ListView resource. 
mainListView = (ListView) findViewById( R.id.mainListView );

//


// Create and populate a List of planet names.
String[] planets = new String[] { "Mercury", "Venus", "Earth", "Mars",
                                  "Jupiter", "Saturn", "Uranus", "Neptune"};  




ArrayList<String> planetList = new ArrayList<String>();
planetList.addAll( Arrays.asList(planets) );




// Create ArrayAdapter using the planet list.
listAdapter = new ArrayAdapter<String>(this, R.layout.simplerow, planetList);




// Add more planets. If you passed a String[] instead of a List<String> 
// into the ArrayAdapter constructor, you must not add more items. 
// Otherwise an exception will occur.
listAdapter.add( "Ceres" );
listAdapter.add( "Pluto" );
listAdapter.add( "Haumea" );
listAdapter.add( "Makemake" );
listAdapter.add( "Eris" );

   // Set the ArrayAdapter as the ListView's adapter.
mainListView.setAdapter( listAdapter ); 


mainListView.setOnItemClickListener(new OnItemClickListener() {

    public void onItemClick(AdapterView<?> arg0, View arg1, int pos,
            long arg3) {

        //Log.i("m", "-"+pos);


    Intent myIntent = new Intent(SimpleListViewActivity.this, MainActivity.class);
    myIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    myIntent.putExtra("pos", pos);
    startActivity(myIntent);

    }

});


  }
}

MainActivity.java

    package com.windrealm.android;
    import android.app.Activity;
    import android.os.Bundle;   
    import android.util.Log;
    import android.widget.TextView;



public class MainActivity extends Activity {
//TextView tv;

/** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.mainactivity);
 TextView   tv = (TextView) findViewById(R.id.textView1);
   Bundle b = getIntent().getExtras();
   int pos = b.getInt("pos"); 
    Log.i("pos=", "-"+pos);
     if(pos==0)

 {

      tv.setText("MERCURY \n Aphelion \n69,816,900 km\n0.466 697 AU\nPerihelion\n 46,001,200 km\n");




 }
 if(pos==2)
{
  tv.setText("earth");
}

  }

  }