DialogFragment生命週期簡介

之前一篇文章Dialog使用介紹介紹了DialogFragemnt的一些使用常識，本文來簡單介紹DialogFragment常用的生命週期函數，調用順序如下：
onAttach -->onCreate–>onCreateDialog–>onCreateView–>onViewCreated–>onSaveInstanceState

在onAttach裏傳入要attach的Activity實例，使得在DialogFragment中可以調用Activity的函數。

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);

        historyViewClickListener = (OnHistoryViewClickListener) activity;
        context = activity;
    }

在onCreate裏對DialogFragment的樣式進行設置，如是不是全屏顯示，要不要展示Titlebar等。

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setStyle(STYLE_NO_FRAME, android.R.style.Theme_Holo_Light); // 沒有titlebar，全屏展示
    }

在onCreateDialog裏設置dialog監聽函數，如對返回鍵的監聽。

    @NonNull
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        Dialog dialog = super.onCreateDialog(savedInstanceState);

        dialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
        dialog.setOnKeyListener(new DialogInterface.OnKeyListener() {
            @Override
            public boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event) {
                if (keyCode == KeyEvent.KEYCODE_BACK) {
                    doHide();
                    return true;
                }
                return false;
            }
        });
        return dialog;
    }

在onCreateView中進行view的初始化，並且解析savedIsntanceState Bundle數據，處理DialogFragment被回收後進行重建的數據處理邏輯。

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = getActivity().getLayoutInflater().inflate(R.layout.atom_flight_history_record_view, container, false);
        Injector.inject(this, view);

        if (null != savedInstanceState) {
            records = (List<SearchRecord>) savedInstanceState.getSerializable("records");
            isShowDays = savedInstanceState.getBoolean("isShowDays", false);
            spaceHeight = savedInstanceState.getInt("spaceHeight");
            listAdapter = new FlightHistoryListAdapter(context, records, isShowDays);
        } else {
            listAdapter = new FlightHistoryListAdapter(context, records, isShowDays);
        }
         return view;
}

onViewCreated緊跟在onCreateView之後執行，執行界面初始化完成之後的一些操作，如動畫效果。

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        showHistoryAnimation();
    }

在onSaveInstanceState中保存重構頁面需要的數據。

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);

        outState.putSerializable("records", (Serializable) records);
        outState.putBoolean("isShowDays", isShowDays);
        outState.putInt("spaceHeight", spaceHeight);
    }