FragmentDialog继承自v4包的Fragment
便于管理Dialog的生命周期
原理：
1.可以看出内部实现还是用的Dialog，Fragment的作用只是便于管理Dialog的生命周期，状态数值等
2.Dialog的初始化

 mDialog = onCreateDialog(savedInstanceState);
 
     @NonNull
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        return new Dialog(getActivity(), getTheme());
    }
2.Dialog的显示
    @Override
    public void onStart() {
        super.onStart();

        if (mDialog != null) {
            mViewDestroyed = false;
            mDialog.show();
        }
    }

可见，当FragmentDialog处于onStart状态时候，dialog就显示了，可以简单理解为fragment显示的时候带出了个dialog
3.Dialog的隐藏

    @Override
    public void onStop() {
        super.onStop();
        if (mDialog != null) {
            mDialog.hide();
        }
    }

4.Dialog的销毁

@Override
    public void onDestroyView() {
        super.onDestroyView();
        if (mDialog != null) {
            // Set removed here because this dismissal is just to hide
            // the dialog -- we don't want this to cause the fragment to
            // actually be removed.
            mViewDestroyed = true;
            mDialog.dismiss();
            mDialog = null;
        }
    }

5.异常情况下的状态保存

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        if (mDialog != null) {
            Bundle dialogState = mDialog.onSaveInstanceState();
            if (dialogState != null) {
                outState.putBundle(SAVED_DIALOG_STATE_TAG, dialogState);
            }
        }
        if (mStyle != STYLE_NORMAL) {
            outState.putInt(SAVED_STYLE, mStyle);
        }
        if (mTheme != 0) {
            outState.putInt(SAVED_THEME, mTheme);
        }
        if (!mCancelable) {
            outState.putBoolean(SAVED_CANCELABLE, mCancelable);
        }
        if (!mShowsDialog) {
            outState.putBoolean(SAVED_SHOWS_DIALOG, mShowsDialog);
        }
        if (mBackStackId != -1) {
            outState.putInt(SAVED_BACK_STACK_ID, mBackStackId);
        }
    }

6.状态的恢复

 if (savedInstanceState != null) {
            mStyle = savedInstanceState.getInt(SAVED_STYLE, STYLE_NORMAL);
            mTheme = savedInstanceState.getInt(SAVED_THEME, 0);
            mCancelable = savedInstanceState.getBoolean(SAVED_CANCELABLE, true);
            mShowsDialog = savedInstanceState.getBoolean(SAVED_SHOWS_DIALOG, mShowsDialog);
            mBackStackId = savedInstanceState.getInt(SAVED_BACK_STACK_ID, -1);
        }

7.手动销毁FragmentDialog

    void dismissInternal(boolean allowStateLoss) {
        if (mDismissed) {
            return;
        }
        mDismissed = true;
        mShownByMe = false;
        if (mDialog != null) {
            mDialog.dismiss();
            mDialog = null;
        }
        mViewDestroyed = true;
        if (mBackStackId >= 0) {
            getFragmentManager().popBackStack(mBackStackId,
                    FragmentManager.POP_BACK_STACK_INCLUSIVE);
            mBackStackId = -1;
        } else {
            FragmentTransaction ft = getFragmentManager().beginTransaction();
            ft.remove(this);
            if (allowStateLoss) {
                ft.commitAllowingStateLoss();
            } else {
                ft.commit();
            }
        }
    }