android-fragments

问题 I have a fragment in my Activity and the fragment has its own toolbar. Like this: Image Here is the layout of the fragment: <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.hometsolutions.space.Fragments.ControlFragment"> <LinearLayout android:layout_width="match_parent" android

问题 After I have added fragment-testing dependency to my project: // Testing dependencies espressoVersion = '3.2.0-beta01' testCoreVersion = '1.1.0' runnerVersion = '1.1.0' extJunitVersion = '1.1.0' testRulesVersion = '1.1.0' fragmentVersion = '1.1.0-alpha09' orchestratorVersion = '1.1.0' uiAutomatorVersion = '2.2.0' junitVersion = '4.12' mockitoVersion = '2.7.22' robolectricVersion = '4.2.1' liveDataTestingVersion = '1.1.0' androidArchCoreTestingVersion = '2.0.0' androidTestImplementation(

问题 I'm writing an app using BottomNavigationView and Fragment for updating the layout programmatically. I'm trying to use a Stack to allow the user to click back and return to the previous fragment. I had tried to use addToBackStack after inflating a new fragment but when back is pressed despite the layout is changing correctly the selected item menu does not change with it. So I decided to create a custom stack of Fragment and change with setSelectedItemId the selected item but this operation

问题 How can I show dates in an app when I scroll the ListView like in WhatsApp? See the below image for clarity: When I scroll the ListView, the date gets displayed over the list. If you still did not understand my question please open your WhatsApp, go to any group & start scrolling: you will see the date getting displayed for older texts. 回答1: To show date like this screenshot, you can use val firstVisiblePosition = layoutManager.findFirstVisibleItemPosition() if (getDateFromFirebaseTime

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

问题 I have a Fragment (it is not an inner class, and it does not have any constructor whatsoever) public class PreferenceListFragment extends ListFragment implements OnClickListener I'm getting this crash report on the Android Developer Console: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.redacted.redacted/com.redacted.redacted.PreferenceActivity}: android.support.v4.app.Fragment$InstantiationException: Unable to instantiate fragment com.redacted.redacted

问题 I have a Fragment (it is not an inner class, and it does not have any constructor whatsoever) public class PreferenceListFragment extends ListFragment implements OnClickListener I'm getting this crash report on the Android Developer Console: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.redacted.redacted/com.redacted.redacted.PreferenceActivity}: android.support.v4.app.Fragment$InstantiationException: Unable to instantiate fragment com.redacted.redacted

问题 I have bottom Navigation also I'm replacing the <fragment> tag with FragmentContainerView it gives me error about does not have a NavController set on, then i was posted this question and fixed the problem, but I got this below error when orientation is changed and selecting item in Bottom Navigation java.lang.IllegalStateException: You must call setGraph() before calling getGraph() FragmentContainer <androidx.fragment.app.FragmentContainerView android:id="@+id/nav_host_fragment" android:name

问题 I have a single Activity android app with lots of fragments. When I'm showing a list screen I want to use the Toolbar with the, app:layout_scrollFlags="scroll|enterAlways" property. And in the detail fragments I want to use the CollapsingToolbarLayout with an image in it. Since it's a single Activity app, I have only one Toolbar . Is it possible to modify my layout programmatically to suit both cases? 回答1: Yes. Let's say you are going from the CollapsingToolbarLayout fragment to the Toolbar

问题 I have a single Activity android app with lots of fragments. When I'm showing a list screen I want to use the Toolbar with the, app:layout_scrollFlags="scroll|enterAlways" property. And in the detail fragments I want to use the CollapsingToolbarLayout with an image in it. Since it's a single Activity app, I have only one Toolbar . Is it possible to modify my layout programmatically to suit both cases? 回答1: Yes. Let's say you are going from the CollapsingToolbarLayout fragment to the Toolbar