private EditText top_middle;//输入框

//-------------------------------------弹出软键盘-----------------------------------
top_middle.setFocusable(true);
top_middle.setFocusableInTouchMode(true);
top_middle.requestFocus();
InputMethodManager inputManager =
(InputMethodManager) top_middle.getContext().getSystemService(
   Context.INPUT_METHOD_SERVICE);
inputManager.showSoftInput(top_middle, 0);
Timer timer = new Timer();
timer.schedule(new TimerTask()
{
  public void run()
  {
   InputMethodManager inputManager =
   (InputMethodManager) top_middle.getContext().getSystemService(
      Context.INPUT_METHOD_SERVICE);
   inputManager.showSoftInput(top_middle, 0);
  }
},

998);

//-----------------------------------软键盘自动关闭----------------------------------------
InputMethodManager imm = (InputMethodManager) this.getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(top_middle.getWindowToken(), 0);

//--------------------------------对话框中自动弹出和关闭-----------------------------------
getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE | WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);