title: How to update the listview when i click the button?
body: <pre><code>    public class MainActivity extends Activity {
      ListView list;
      String[] abc={"1","2","3"};
      MyCustomAdapter adapter;
      Button refresh;
          @Override
          protected void onCreate(Bundle savedInstanceState) {
              super.onCreate(savedInstanceState);
              setContentView(R.layout.main);
              list=(ListView) findViewById(R.id.list);
               refresh=(Button) findViewById(R.id.refresh);
               adapter=new MyCustomAdapter(MainActivity.this,abc);
              list.setAdapter(adapter);
  
          }
           private class MyCustomAdapter extends BaseAdapter {
                  private final Context context;
                  private ArrayList mData = new ArrayList();
                  private LayoutInflater mInflater;
                  private String[] hashmap;
                  ViewHolder holder = null;
                  public MyCustomAdapter(Context context,String[] hashMaps) {
                      super();
                      this.context = context;
                      this.hashmap = hashMaps;
                      mInflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                  }
                  public int getCount() {
  
                      return hashmap.length;
  
                  }
  
  
                  public Object getItem(int position) {
                      return hashmap.length;
                  }
  
  
                  public long getItemId(int position) {
  
                      return position;
                  }
  
                  @Override
                  public void notifyDataSetChanged() // Create this function in your adapter class
                  {
                      super.notifyDataSetChanged();
                  }
                  @Override
                  public View getView(final int position, View convertView, ViewGroup parent) {
                      System.out.println("getView " + position + " " + convertView);
                     // final ViewHolder holder = null;
                      if (convertView == null) {
                          convertView = mInflater.inflate(R.layout.view1, null);
                          holder = new ViewHolder();
                          holder.textView = (TextView)convertView.findViewById(R.id.text);
                          holder.btn = (Button)convertView.findViewById(R.id.refresh);
                          convertView.setTag(holder);
                      } else {
                          holder = (ViewHolder)convertView.getTag();
                      }
                      holder.textView.setText(hashmap[position]);
  
                      holder.btn.setOnClickListener(new OnClickListener(){  
                             @Override
                            public void onClick(View v) {
                               RelativeLayout rl = (RelativeLayout)v.getParent();
                              holder.textView = (TextView)rl.getChildAt(position);
                              Log.i("position",String.valueOf(position));
                              holder.textView.setText("10");
                             }
                           });
  
                      return convertView;
  
                  }
  
              }
  
              public static class ViewHolder {
                  public TextView textView;
                  public Button btn;
              }
  
  
  
  
      }
  </code></pre>
  
  <p><strong>View.xml</strong></p>
  
  <pre><code>&lt;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"
     android:id="@+id/real"
      &gt;
      &lt;TextView 
                  android:id="@+id/text"
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:layout_alignParentLeft="true"
                  android:text="Text"
                  android:layout_marginTop="15dp"
                  android:layout_marginLeft="20dp"
                  /&gt;
      &lt;Button 
                  android:id="@+id/refresh"
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:layout_toRightOf="@id/text"
                  android:text="button"
                   android:layout_marginLeft="20dp"
                  /&gt;
      &lt;/RelativeLayout&gt;
  </code></pre>
  
  <p>Here in my ListView,when i click the button the value is not changed inside my adapter view.how to resolve this? the list contains 3 values of each position.so when i click the button in the clicked position,the value is going to be change instead of old value.                                  </p>