android中ListView数据刷新时的同步方法

public class Main extends BaseActivity {  private static final String TAG = "tag";  private static final int STATUS_CHANGE = 0;  ExpandableListView mElv;  ArrayList<GroupInfo> mGroupArray;  @Override  public void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   setContentView(R.layout.main);   mElv = (ExpandableListView) findViewById(R.id.contact_list);   mStatus = (TextView) findViewById(R.id.setStatus);   mGroupArray = getIntent().getParcelableArrayListExtra("groupArray");// => 取数据   mExpandableAdapter = new ExpandableAdapter(this, Main.this);   mElv.setAdapter(mExpandableAdapter);     // 异步对比服务器分组和本地分组   HandlerThread handlerThread = new HandlerThread("handler_thread");   handlerThread.start();   UpdateGroupHandler myHandler = new UpdateGroupHandler(     handlerThread.getLooper());   Message message = myHandler.obtainMessage();   message.sendToTarget();   mHandler = new Handler() {    public void handleMessage(Message msg) {     switch (msg.what) {     case STATUS_CHANGE:      // 处理UI更新等操作      updateUI();      break;     }    };   };   }  /**   * 发送消息更新UI   */  private void sendMessageToUpdateUI() {   Message msg = new Message();   msg.what = STATUS_CHANGE;   mHandler.sendMessage(msg);  // 向Handler发送消息,更新UI  }  private void updateUI() {   // 详细的更新   mExpandableAdapter.notifyDataSetChanged();  // 更新ExpandableListView  }  /**   * 异步刷新分组的handler   *   * @author administrator   *   */  class UpdateGroupHandler extends Handler {   public UpdateGroupHandler() {   }   public UpdateGroupHandler(Looper looper) {    super(looper);   }   @Override   public void handleMessage(Message msg) {    ContactsManagerDbAdapter dbAdapter = new ContactsManagerDbAdapter(      Main.this);    dbAdapter.open();    // =>doSomeThing...    mGroupArray = groupList;    System.out.println("========数据更新后,刷新listview=========");    sendMessageToUpdateUI();   }  }  private class ExpandableAdapter extends BaseExpandableListAdapter {   Activity activity;   LayoutInflater layoutInflater;   public ExpandableAdapter(Activity a, Context context) {    activity = a;    layoutInflater = (LayoutInflater) context      .getSystemService(Context.LAYOUT_INFLATER_SERVICE);   }   public Object getChild(int groupPosition, int childPosition) {    return mGroupArray.get(groupPosition).getChildList()      .get(childPosition);   }   public long getChildId(int groupPosition, int childPosition) {    return childPosition;   }   public int getChildrenCount(int groupPosition) {    return mGroupArray.get(groupPosition).getChildList().size();   }   public View getChildView(int groupPosition, int childPosition,     boolean isLastChild, View convertView, ViewGroup parent) {    // .....    return vi;   }   public Object getGroup(int groupPosition) {    return mGroupArray.get(groupPosition);   }   public int getGroupCount() {    return mGroupArray.size();   }   public long getGroupId(int groupPosition) {    return groupPosition;   }   public View getGroupView(int groupPosition, boolean isExpanded,     View convertView, ViewGroup parent) {    GroupInfo groupInfo = mGroupArray.get(groupPosition);    String string = groupInfo.getName();    convertView = (View) layoutInflater.inflate(R.layout.group_layout,      null);    final TextView textView = (TextView) convertView      .findViewById(R.id.groupName);    if (textView != null) {     textView.setText(string);    }    return convertView;   }   public boolean hasStableIds() {    return true;   }   public boolean isChildSelectable(int groupPosition, int childPosition) {    return true;   }  } }

Message.obj = groupList;

@Override public void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.main);  mElv = (ExpandableListView) findViewById(R.id.contact_list);  mStatus = (TextView) findViewById(R.id.setStatus);  mGroupArray = getIntent().getParcelableArrayListExtra("groupArray"); // => 取数据  mExpandableAdapter = new ExpandableAdapter(this, Main.this);  mElv.setAdapter(mExpandableAdapter);    // 异步对比服务器分组和本地分组  HandlerThread handlerThread = new HandlerThread("handler_thread");  handlerThread.start();  UpdateGroupHandler myHandler = new UpdateGroupHandler(    handlerThread.getLooper());  Message message = myHandler.obtainMessage();  message.sendToTarget();  mHandler = new Handler() {   public void handleMessage(Message msg) {    switch (msg.what) {    case STATUS_CHANGE:     // 处理UI更新等操作     updateUI(msg.obj);     break;    }   };  };  } /** * 发送消息更新UI */ private void sendMessageToUpdateUI(ArrayList<GroupInfo> groupList) {  Message msg = new Message();  msg.what = STATUS_CHANGE;  msg.obj = groupList;  mHandler.sendMessage(msg); // 向Handler发送消息,更新UI }  @SuppressWarnings("unchecked") private void updateUI(Object obj) {  // 详细的更新  mGroupArray = (ArrayList<GroupInfo>) obj;  mExpandableAdapter.notifyDataSetChanged(); // 更新ExpandableListView } /**  * 异步刷新分组的handler  *  * @author administrator  *  */ class UpdateGroupHandler extends Handler {  public UpdateGroupHandler() {  }  public UpdateGroupHandler(Looper looper) {   super(looper);  }  @Override  public void handleMessage(Message msg) {   ContactsManagerDbAdapter dbAdapter = new ContactsManagerDbAdapter(     Main.this);   dbAdapter.open();   // =>doSomeThing...   System.out.println("========数据更新后,刷新listview=========");   sendMessageToUpdateUI(groupList);  } }