Android 恢复片段而不重新创建?
我有8个片段和一个活动。根据用户选择,我将用适当的片段替换内容。在这里,我正在将片段添加到后堆栈中。这工作正常。。当点击“后退”按钮时,片段将从后堆栈中逐个显示。。但是这些片段将再次重新加载。。如何在不重新创建的情况下恢复片段 我试过这样做Android 恢复片段而不重新创建?,android,android-fragments,fragment,back-stack,Android,Android Fragments,Fragment,Back Stack,我有8个片段和一个活动。根据用户选择,我将用适当的片段替换内容。在这里,我正在将片段添加到后堆栈中。这工作正常。。当点击“后退”按钮时,片段将从后堆栈中逐个显示。。但是这些片段将再次重新加载。。如何在不重新创建的情况下恢复片段 我试过这样做 public <T> void attachFragmentToContentView(int fragmentId) { Fragment fragment = null; switch (frag
public <T> void attachFragmentToContentView(int fragmentId) {
Fragment fragment = null;
switch (fragmentId) {
case Constants.ID_FRAGMENT_DEVICE_THEME:
fragment = DeviceThemeFragment.createInstance();
break;
case Constants.ID_FRAGMENT_CORPORATION_INFO:
fragment = CorporationInformationFragment.createInstance();
break;
case Constants.ID_FRAGMENT_NEW_OFFERS:
fragment = new NewOffersFragment<T>();
break;
case Constants.ID_FRAGMENT_ACHIEVEMENTS:
fragment = new CompanyAchievementFragment<T>();
break;
case Constants.ID_FRAGMENT_CLIENTELE:
fragment = new ClienteleFragment<T>();
break;
case Constants.ID_FRAGMENT_ONGOING_SCHEMES:
fragment = new OnGoingSchemesFragment<T>();
break;
case Constants.ID_FRAGMENT_TRACKING:
fragment = new TrackingFragment<T>();
break;
case Constants.ID_FRAGMENT_ENQUIRY_FORM:
fragment = new EnquiryFragment<T>();
break;
case Constants.ID_FRAGMENT_NEWS_EVENTS:
fragment = new NewsEventsFragment<T>();
break;
default:
comingSoon();
break;
}
if (fragment != null) {
FragmentTransaction fragmentTransaction = fragmentManager
.beginTransaction();
fragmentTransaction.replace(R.id.content, fragment,
String.valueOf(fragmentId));
//
fragmentManager.addOnBackStackChangedListener(this);
fragmentTransaction.addToBackStack(String.valueOf(fragmentId));
fragmentTransaction.commit();
}
}
public void attachFragmentToContentView(int fragmentId){
片段=空;
交换机(碎片ID){
case Constants.ID\u片段\u设备\u主题:
fragment=DeviceThemeFragment.createInstance();
打破
case Constants.ID\u片段\u公司\u信息:
fragment=CorporationInformationFragment.createInstance();
打破
case Constants.ID_FRAGMENT_NEW_提供:
fragment=新的newOfferFragment();
打破
case Constants.ID_片段_成就:
fragment=新公司实现fragment();
打破
case Constants.ID_FRAGMENT_客户:
片段=新客户片段();
打破
case Constants.ID\u片段\u正在进行的\u方案:
fragment=新的OnGoingSchemesFragment();
打破
case Constants.ID\u片段\u跟踪:
fragment=新的TrackingFragment();
打破
case Constants.ID\u片段\u查询\u表格:
片段=新查询片段();
打破
case Constants.ID\u片段\u新闻\u事件:
fragment=新的NewsEventsFragment();
打破
违约:
即将到来();
打破
}
if(片段!=null){
FragmentTransaction FragmentTransaction=fragmentManager
.beginTransaction();
fragmentTransaction.replace(R.id.content,fragment,
valueOf(fragmentId));
//
fragmentManager.AddonBackbackChangedListener(此);
fragmentTransaction.addToBackStack(String.valueOf(fragmentId));
fragmentTransaction.commit();
}
}
我从后堆栈弹出时遇到问题。如果有人能解决我的问题,我将不胜感激
谢谢,
Chaitanya.K试试这个
Fragment fragment = null;
switch (position) {
case 0:
fragment = new HomePage();
break;
case 1:
fragment = new SecondPage();
break;
case 2:
fragment = new ThirdPage();
break;
case 3:
fragment = new SettingsPage();
break;
default:
break;
}
if (fragment != null) {
FragmentManager fm = getSupportFragmentManager();
FragmentTransaction transaction = fm.beginTransaction().replace(R.id.frame_container, fragment);
transaction.commit();
在所有片段中都应该有一个构造函数。
至少是这样
public HomePage(){}
我认为您可能必须使用attach/detach,但首先,在创建新实例之前,尝试搜索片段的现有实例:
Fragment fragment = fragmentManager.findFragmentByTag(String.valueOf(fragmentId));
if (fragment != null) {
FragmentTransaction fragmentTransaction = fragmentManager
.beginTransaction();
fragmentTransaction.attach(R.id.content, fragment);
fragmentManager.addOnBackStackChangedListener(this);
fragmentTransaction.addToBackStack(String.valueOf(fragmentId));
fragmentTransaction.commit();
}
else {
// contents of your switch statement setting fragment
if (fragment != null) {
FragmentTransaction fragmentTransaction = fragmentManager
.beginTransaction();
fragmentTransaction.replace(R.id.content, fragment,
String.valueOf(fragmentId));
fragmentManager.addOnBackStackChangedListener(this);
fragmentTransaction.addToBackStack(String.valueOf(fragmentId));
fragmentTransaction.commit();
}
}
如果我明白你的意思。这对你有帮助
@Override
public void onBackPressed(){
if (getSupportFragmentManager().getBackStackEntryCount() == 1){
finish();
}
else {
super.onBackPressed();
}
}
试试这个。这确实不是问题。请考虑在OnSaveStestScript()中保存片段的状态,并基于该状态重新加载它。我试着把每一个片段都保存在一个静态状态。但是,onSavedInstanceState没有调用..你知道吗?请查看上面的链接,但当用户点击back时,我需要往回遍历。所以我必须将片段添加到后堆栈中。对!!!根据用户选择,碎片加载良好。但使用“后退”按钮返回时,这些碎片正在重新加载/重新创建。