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My activity declares all of its GUI fragments in a single XML layout. It only needs to display a few of the fragments at launch time; the rest get shown as the user interacts with the app. A portion of the layout is as follows:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<fragment
android:id="@+id/map_panel"
android:name="com.example.MapPanel"
android:layout_width="match_parent"
android:layout_height="@dimen/map_panel_height" />
<fragment
android:id="@+id/list_panel"
android:name="com.example.ListPanel"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/map_panel" />
<fragment
android:id="@+id/detail_panel"
android:name="com.example.DetailPanel"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/map_panel"
android:visibility="gone" />
My intention is that the list_panel fragment is visible at startup, and the detail_panel fragment is hidden until the user selects something from the list.
By default, a fragment starts out with the isHidden attribute as false. That means my activity has to iterate through the loaded fragments and manually call isHidden(true) on fragments like detail_panel at startup time.
I would prefer to declare the isHidden status in the XML layout. However, setting android:visibility="gone" in a <fragment> declaration does not change the isHidden status, and I can't find any documentation on another attribute that would do the trick.
Is it possible to set an XML attribute on a <fragment> to cause it to be hidden?
Note: I'm not concerned with view visibility, I'm concerned with the fragment.isHidden() value. That affects how FragmentManager manipulates the back stack and performs animations. If you call transaction.show(fragment) on a fragment whose view is invisible or gone, but the fragment.isHidden() value is false, then the FragmentManager will not make the view visible. See http://developer.android.com/reference/android/app/Fragment.html#isHidden() for reference.
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If you remove layout. setVisibility(View. GONE); from the code then ft. hide(f); will not hide fragment.
A Fragment is a combination of an XML layout file and a java class much like an Activity . Using the support library, fragments are supported back to all relevant Android versions. Fragments encapsulate views and logic so that it is easier to reuse within activities.
To declaratively add a fragment to your activity layout's XML, use a FragmentContainerView element. The android:name attribute specifies the class name of the Fragment to instantiate.
specifying a fragment in the XML file using inside the activity's layout file; and programmatically by adding the fragment to an existing ViewGroup. First, let's look at the fragment_layout.xml file below.
For adding the fragment in the layout please go to the following step. On the main_activity layout file click on the Design view and on the left side please go to the bottom and there will be an option named <fragment> click on that and one box will appear. From that please select FragmentA which we have created.
How to use context in a fragment? Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project. Step 2 − Add the following code to res/layout/activity_main.xml. In the above code, we have taken two fragments. Step 3 − Add the following code to src/MainActivity.java
As mentioned before a fragment is a portion of the UI associated with an activity overall view hierarchy. In the fragment app example we add fragments to the activity layout in two different ways: specifying a fragment in the XML file using inside the activity's layout file; and programmatically by adding the fragment to an existing ViewGroup.
I faced a similar situation, where I had to hide a fragment.
I simply included the fragment inside a LinearLayout and marked the layout to be visible/gone.
<LinearLayout
android:id="@+id/map_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:visibility="visible" >
<fragment
android:id="@+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.MapFragment" />
</LinearLayout>
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