AlertDialog不顯示時不創建

Question

我有一個活動，必須顯示AlertDialog與ListView供用戶選擇其中一個選項。當我將AlertDialog的代碼放入onCreate方法時，它可以工作。但是在其他地方，它不會。控制檯上沒有錯誤。

這裏是它被稱爲（在活動）：

@Override 
public void onStateChanged(IntegratorState state) { 
    switch (state.getState()) { 
    case AWAITING_MENU_OPTION: 
     IntegratorHelper.showOptionsMenu(state, SitefMenuActivity.this).show(); 
     break; 
    default: 
     Toast.makeText(getApplicationContext(), state.getState().name(), 
       Toast.LENGTH_LONG).show(); 
    } 
} 

這裏是我創建對話框（在其他類）：

public static AlertDialog showOptionsMenu(IntegratorState state, Context context) { 
    AlertDialog.Builder builder = new AlertDialog.Builder(context); 
    builder.setTitle(state.getGatewayMessageExtra()); 
    String[] strings; 
    strings = state.getGatewayMessage().split(";"); 

    final List<String> options = Arrays.asList(strings); 

    builder.setAdapter(new MenuSaleAdapter(context, 
      android.R.layout.simple_list_item_1, options), 
      new DialogInterface.OnClickListener() { 
       @Override 
       public void onClick(DialogInterface dialog, int which) { 
        if (which == options.size()-1) { 
         // Do a thing 
        } else { 
         // Do other thing 
        } 
       } 
      }); 
    return builder.create(); 
} 

private static class MenuSaleAdapter extends ArrayAdapter<String> { 

    public MenuSaleAdapter(Context context, int textViewResourceId, 
      List<String> objects) { 
     super(context, textViewResourceId, objects); 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     TextView view = (TextView) super.getView(position, convertView, 
       parent); 
     view.setTextColor(Color.BLACK); 
     return view; 
    } 
} 

我試圖把所有的代碼在同一個活動中，但它仍然不起作用。該應用程序不凍結或任何東西，它只是不顯示對話框。有任何想法嗎？感謝

Answer 1

嘗試改變第一部分：

@Override 
    public void onStateChanged(IntegratorState state) { 
    switch (state.getState()) { 
    case AWAITING_MENU_OPTION: 
     IntegratorHelper.showOptionsMenu(state, SitefMenuActivity.this); 
     break; 
    default: 
     Toast.makeText(getApplicationContext(), state.getState().name(), 
       Toast.LENGTH_LONG).show(); 
    } 
} 

和第二部分：

public static void showOptionsMenu(IntegratorState state, Activity activity) { 
    AlertDialog.Builder builder = new AlertDialog.Builder(activity); 
    builder.setTitle(state.getGatewayMessageExtra()); 
    String[] strings; 
    strings = state.getGatewayMessage().split(";"); 

    final List<String> options = Arrays.asList(strings); 

    builder.setAdapter(new MenuSaleAdapter(activity, 
      android.R.layout.simple_list_item_1, options), 
      new DialogInterface.OnClickListener() { 
       @Override 
       public void onClick(DialogInterface dialog, int which) { 
        if (which == options.size()-1) { 
         // Do a thing 
        } else { 
         // Do other thing 
        } 
       } 
      }); 
    builder.create().show(); 
}