notifyDataSetChanged（）不刷新列表视图

Question

这是我的适配器：

public class Conversa extends BaseAdapter { 

private Context context; 
private ArrayList<String> log; 
private String target; 

public Conversa(Context context, String target) { 
    this.context = context; 
    this.target = target; 
    log = new ArrayList<String>(); 
} 

@Override 
public int getCount() { 
    return log.size(); 
} 

@Override 
public Object getItem(int pos) { 
    return log.get(pos); 
} 

@Override 
public long getItemId(int arg0) { 
    return 0; 
} 

@Override 
public View getView(int pos, View convertView, ViewGroup parent) { 
    if (convertView == null) { 
     LayoutInflater inflater = (LayoutInflater) context 
       .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     convertView = inflater.inflate(R.layout.msg_layout, parent, false); 
    } 

    TextView msg = (TextView) convertView.findViewById(R.id.msg); 
    msg.setText(log.get(pos)); 

    return convertView; 
} 

public ArrayList<String> getLog() { 
    return log; 
} 

public String getTarget() { 
    return target; 
} 

public void setTarget(String target) { 
    this.target = target; 
} 

public void addMessage(String msg) { 
    log.add(msg); 
    notifyDataSetChanged(); 
} 
    } 

这是我的片段，它富人当Conversa.addMessage（）被调用未刷新列表视图。

public class ChatFragment extends Fragment { 

private String target; 
private ListView listview; 
private EditText edittext; 
private Conversa conversa; 
private MainActivity activity; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

    target = getArguments().getString(IRCService.EXTRA_TARGET); 

    activity = (MainActivity) getActivity(); 

    conversa = activity.service.getConversa(target); 

} 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
     Bundle savedInstanceState) { 

    setHasOptionsMenu(true); 

    View view; 

    view = inflater.inflate(R.layout.chat_layout, container, false); 

    edittext = (EditText) view.findViewById(R.id.chatinput); 
    listview = (ListView) view.findViewById(R.id.chatlist); 

    listview.setAdapter(conversa); 

    // EM CASO DE RETORNO DO SERVICE EM BACKGROUND, ROLAR A LISTA ATEH O FIM 
    if (!conversa.getLog().isEmpty()) { 
     scrollMyListViewToBottom(); 
    } 

    // LISTENER QUE RECEBERA O "ENVIAR" DO TECLADO DO ANDROID 
    edittext.setOnEditorActionListener(new OnEditorActionListener() { 
     @Override 
     public boolean onEditorAction(TextView v, int actionId, 
       KeyEvent event) { 
      boolean handled = false; 
      if (actionId == EditorInfo.IME_ACTION_SEND) { 
       // ESCONDE O TECLADO APOS ENVIAR 
       InputMethodManager in = (InputMethodManager) getActivity() 
         .getSystemService(Context.INPUT_METHOD_SERVICE); 
       in.hideSoftInputFromWindow(
         edittext.getApplicationWindowToken(), 
         InputMethodManager.HIDE_NOT_ALWAYS); 

       sendMessage(target, edittext.getText().toString()); 

       // ALTERA O FLAG 
       handled = true; 

      } 

      return handled; 
     } 
    }); 

    return view; 
} 

@Override 
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { 
    if (target.equals(IRCService.CANAL)) { 
     inflater.inflate(R.menu.canal_menu, menu); 
    } else { 
     inflater.inflate(R.menu.pvt_menu, menu); 
    } 
} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    switch (item.getItemId()) { 
    case R.id.menu_closepvt: 
     activity.removePVTTab(conversa.getTarget()); 
     return true; 

    case R.id.menu_desconectar: 
     activity.service.IRCdisconnect(); 
     return true; 

    case R.id.menu_mudarnick: 
     // TODO IMPLEMENTAR MUDANÇA DE NICK 

     return true; 
    } 

    return false; 

} 

public void sendMessage(String target, String msg) { 
    activity.service.sendMessage(target, msg); 

    // APAGA O EDITTEXT 
    edittext.setText(""); 
} 

private void scrollMyListViewToBottom() { 
    listview.post(new Runnable() { 
     @Override 
     public void run() { 
      // Select the last row so it will scroll into view... 
      listview.setSelection(conversa.getCount() - 1); 
     } 
    }); 
} 

public void setQuote(String nick) { 
    ((MainActivity) getActivity()).drawerlayout.closeDrawers(); 
    edittext.setText(nick + ": "); 
    edittext.requestFocus(); 
} 
    } 

如果我收到一条聊天消息，它不会出现在列表上，尽管消息存在于日志中。当我触摸edittext编写消息时，它刷新视图并显示消息。 我想它一出现即会出现。 请帮帮我。

Answer 1

取出

public void addMessage(String msg) { 
log.add(msg); 
notifyDataSetChanged(); 

，并在您的主要活动中使用它：

Conversa.log.add(msg); 
notifyDataSetChanged();