java - 确定要更新的 fragment

Question

我正在更新当前显示的 View 并隐藏/显示两个 fragment 。

FragmentTransaction fragmentTransaction =  getSupportFragmentManager().beginTransaction();

    if (mTaxLocationListViewFrag.isVisible()) {
        if (mGoogleMapFrag == null) {
            mGoogleMapFrag = new GoogleMapFragment();
            fragmentTransaction.add(R.id.fragment_container, mGoogleMapFrag);
        }
        fragmentTransaction.hide(mListViewFrag);
        fragmentTransaction.show(mGoogleMapFrag).commit();

    } else {fragmentTransaction.hide(mGoogleMapFrag).show(mListViewFrag).commit();
    }

    updateDisplay();

updateDisplay 方法-

if (mListViewFrag != null && mListViewFrag.isVisible()) {
            Log.d(TAG, "Update Location ListView");
            mListViewFrag.setLocations(mLocations);
        }

        if (mGoogleMapFrag != null && mGoogleMapFrag.isVisible()) {
            Log.d(TAG, "Update Google Maps Markers");
            //Convert locations to markers to display.

        }

问题是我猜测 fragmentTransaction 在执行 .show 和 .hide 时是异步的，并且 updateDisplay 没有像它认为的那样正常工作要隐藏的 fragment 仍在显示。有没有更可靠的方法来检查要更新哪个 fragment ？

Answer 1

添加 fragment 后添加fragmentTransaction.executePendingTransactions()。来自 executePendingTransactions() 的文档:

It is scheduled to be executed asynchronously on the process's main thread. If you want to immediately executing any such pending operations, you can call this function (only from the main thread) to do so. Note that all callbacks and other related behavior will be done from within this call, so be careful about where this is called from.