彈出軟鍵盤

commentEditText.requestFocus();
Timer timer = new Timer(); //設置定時器
timer.schedule(new TimerTask() {
    @Override
    public void run() { //彈出軟鍵盤的代碼
                    InputMethodManager imm = (InputMethodManager)mContext.getSystemService(Context.INPUT_METHOD_SERVICE);
    imm.showSoftInput(commentEditText, InputMethodManager.RESULT_SHOWN);
    imm.toggleSoftInput(InputMethodManager.SHOW_FORCED, InputMethodManager.HIDE_IMPLICIT_ONLY);
                }
            }, 500);

彈出軟鍵盤以前，要保證EditText獲取到焦點，並延遲執行，等待界面繪製完畢