fragment | 易学教程

Bad window token, you cannot show a dialog before an Activity is created or after it's hidden

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问题 I am using an AppIntro library in my app. It has 3 slides. I want to ask the user something when the third slide is shown. To achieve that I am using material dialogs by afollestad. My code in the AppIntro Activity looks like that: @Override public void onNextPressed() { if(this.pager.getCurrentItem() == 2) { MaterialDialog dialog = new MaterialDialog.Builder(getApplicationContext()) .title("QR Code scannen") .content("Möchtest du den QR Code scannen oder selbst eingeben?") .positiveText(

How to show activity (which cannot be converted to fragment) using BottomNavigationBar?

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问题 I have problem with showing my activity. I don't know how to implement methods from NoteActivity to HomeFragment . HomeFragment is carried out by BottomNavigationBar without executing a NoteActivity . NoteActivity- public class NoteActivity extends AppCompatActivity { private FirebaseFirestore db = FirebaseFirestore.getInstance(); private CollectionReference notebookRef = db.collection("Notebook"); private NoteAdapter adapter; @Override protected void onCreate(Bundle savedInstanceState) {

FragmentContainerView as NavHostFragment

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问题 Seems like using the FragmentContainerView doesn't work right out of the box? <androidx.fragment.app.FragmentContainerView class="androidx.navigation.fragment.NavHostFragment" android:id="@+id/fragment_nav_host" android:layout_width="match_parent" android:layout_height="match_parent" app:defaultNavHost="true" app:navGraph="@navigation/nav_app" /> Here's my code using fragment-ktx:1.2.0-rc01 and I'm just always getting this error: Caused by: java.lang.IllegalStateException: Activity ..

FragmentContainerView as NavHostFragment

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getSupportFragmentManager().findFragmentById returns null for google maps in fragment in android?

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问题 I have a problem with Google Maps, i.e. getSupportFragmentManager().findFragmentById returns always null. Do you have an idea how to solve this? Here is the code: fragment_map.xml: <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.myapp.something.MapFragment"> <fragment android:id="@+id/map" android:layout_width="match_parent" android

Proper use of sub sub fragments with (Child)FragmentManager

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问题 How do I properly use Fragments in Fragments? My (simplified) use case is following, I have an activity with a layout fragment and this fragment theirself contains a sub fragment... all fragments are added manually to their parents... ---------------------------------------------------------- - Activity - - - - - - --------------------------------------- - - - Fragment - - - - - - - - ----------------- - - - - - SubFragment - - - - - - - - - - - - - - - - - ----------------- - - - -----------

Proper use of sub sub fragments with (Child)FragmentManager

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测试应用documentFragment 和直接操作dom 的区别

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DocumentFragment 节点不属于文档树，继承的 parentNode 属性总是 null。不过它有一种特殊的行为，该行为使得它非常有用，即当请求把一个 DocumentFragment 节点插入文档树时，插入的不是 DocumentFragment 自身，而是它的所有子孙节点。这使得 DocumentFragment 成了有用的占位符，暂时存放那些一次插入文档的节点。它还有利于实现文档的剪切、复制和粘贴操作同时我们了解到当需要对页面DOM进行操作的时候必然会导致多次重绘、回流（什么是重绘，回流？）。这样会加大页面的负担。影响页面性能。因此我们可以创建这样一个临时占位符。测试 demo: <!DOCTYPE html> <html> <head> <title></title> </head> <body> <div id="box"> <button onclick="addList()">Button</button> <button onclick="addList2()">Button</button> </div> <div> <ul id="myList"> <li>item</li> </ul> <hr> </div> <script type="text/javascript"> function addList(){ var doc =

Add same fragment second time (add more then one time fragment) then RecyclerView scroll lagging

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问题 Add same fragment second time (add more then one time fragment) then RecyclerView scroll lagging I am using fragment reusability .but add second time fragment then start this problem. I am remove image load library but not any improvement i am face same problem. I am also check this link click add fragment then facing this problem. but replace fragment then not facing this problem more add fragment then RecyclerView lagging. i think fragment memory issue Every time user click see all related

Android自定义控件----RadioGroup实现APP首页底部Tab的切换

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【声明】欢迎转载，但请保留文章原始出处→_→ 生命壹号： http://www.cnblogs.com/smyhvae/ 文章来源： http://www.cnblogs.com/smyhvae/p/4463931.html 【正文】实现APP首页底部Tab的切换已经见过四五种方式了，先来看运行的效果图吧：今天我们就用RadioGroup的方法来实现以下。【开发环境】物理机版本：win 7旗舰版（64位） IDE版本：Android Studio 1.2 preview 工程文件结构：（本文最后有源码） HomeActivity.java:整个首页的界面四个Fragment.java:对应的四个Fragment界面 drawable文件夹中是对应tab和文字切换的状态剩下的xml文件就是对应的Activity和Fragment的布局文件了。一、布局文件：（1） activity_home.xml :HomeActivity的布局文件 1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 2 xmlns:tools="http://schemas.android.com/tools" 3 android:layout_width="match_parent" 4