避免在FragmentTabHost标签交换数据重装 [英] Avoid reloading data in FragmentTabHost tab switching

问题描述

我已经卡式布局使用FragmentTabHost两个片段。在标签选择每个片段重新创建（onCreateView，onActivityCreated ......再次调用）。我载荷数据的第一片段（在onCreateView）移动到其他选项卡，当我回来的第一个片段，整个片段重建等数据再次加载。我不想对标签交换一次又一次加载数据。我该怎么办？

I have Tabbed layout with two fragments using FragmentTabHost. On tab selection each fragment is re-created (onCreateView, onActivityCreated... called again). I loads data in first fragment (in onCreateView) move to other tab and when I come back to first fragment, whole fragment is recreated and so data is again loaded. I don't want to load data again and again on tab switching. What should I do?

我试图安装和拆卸碎片，而不是添加/更换，但所有片段生命周期方法仍然被一再呼吁选项卡切换。什么是实现期望的行为的正确方法？

I tried attaching and detaching fragments instead of adding/replacing but all Fragment life cycle methods are still being called again and again on tab switching. What is the right way to achieve desired behavior?

推荐答案

您应该隐藏和显示你的片段。否则onCreateView如果添加/替换被调用。因此，如果碎片已经是present，使用显示和隐藏。

You should hide and show your fragments. Otherwise onCreateView gets called if you add/replace. So if the fragment is already present, use show and hide.

在您onTabChanged，请补充以下code。

In your onTabChanged, please add the below code.

if (mLastTab != newTab) {
            FragmentTransaction ft = this.getSupportFragmentManager()
                    .beginTransaction();
            if (mLastTab != null) {
                if (mLastTab.fragment != null) {
                    ft.hide(mLastTab.fragment);
                }
            }
            if (newTab != null) {
                if (newTab.fragment == null) {
                    newTab.fragment = Fragment.instantiate(this,
                            newTab.clss.getName(), newTab.args);
                    ft.add(android.R.id.tabcontent, newTab.fragment, newTab.tag);
                } else {
                    ft.show(newTab.fragment);
                }
            }

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