Add buttons above scroll (I guess you can't teach an old dog new tricks! ) - button

ON SUNDAY I ACTUALLY SIDE-LOADED MY FIRST APP!!! Simple, unfinished, couple bugs, but it works.
My opening screen (XML: "event_list.xml") is a scroll list - select one get detail screen.
XML looks like: (This code is still a fragment.)
<?xml version="1.0" encoding="utf-8"?>
<fragment
xmlns:android="http://schemas.android.com/apk/res/android"
android:name="com.dummies.android.taskreminder.EventListFragment"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
And the row (XML "event_row.xml") looks like:
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/text1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:textSize="12dp"
android:padding="2dip" />
I want a couple buttons at the top above the scroll. The best I can do is:
<?xml version="1.0" encoding="utf-8"?>
<fragment
xmlns:android="http://schemas.android.com/apk/res/android"
android:name="com.dummies.android.taskreminder.EventListFragment"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<Button
android:id="#+id/btn_Add"
android:text="#string/add"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</fragment>
But the button overlays the first entry!
What ties the row to the list screen and how do I get two buttons above the scroll (rows)?

This is what finally worked.
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<Button android:id="#+id/btn_Add"
android:layout_width="50dp"
android:layout_height="30dp"
android:textSize="12dp"
android:padding="1dip"
android:text="#string/add" />
<Button android:id="#+id/btn_Exit"
android:layout_width="50dp"
android:layout_height="30dp"
android:textSize="12dp"
android:padding="1dip"
android:layout_marginLeft="5dp"
android:layout_toRightOf="#+id/btn_Add"
android:text="#string/exit" />
<Button android:id="#+id/btn_Other"
android:layout_width="50dp"
android:layout_height="30dp"
android:textSize="12dp"
android:padding="1dip"
android:layout_marginLeft="5dp"
android:layout_toRightOf="#+id/btn_Exit"
android:text="#string/other" />
<fragment
android:name="com.dummies.android.taskreminder.EventListFragment"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/btn_Add" />
</RelativeLayout>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/text1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:textSize="12dp"
android:padding="2dip" />
<!-- This defines a row in which text can be placed -->
<!-- "text1" is the IDof the view for loading the list with data -->
Now just need to make the button code copied from detail screen (activity only) work in list screen (w/ fragment):
This generates errors: (findViewById undefined)
mExitButton = (Button)findViewById(R.id.btn_Exit);
This crashed:
mExitButton = (Button)getView().findViewById(R.id.btn_Exit);
Still working in this (it's late):
View myFragmentView = inflater.inflate(R.layout.????????, container, false);

Related

onBindViewHolder of RecyclerView inside nestedscrollview is getting invoked for all item at once

I am having a CollapsingToolbar and a bottom navbar as shown:
<androidx.coordinatorlayout.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:fitsSystemWindows="true"
app:layout_constraintBottom_toTopOf="#id/nav_view"
app:layout_constraintTop_toTopOf="parent">
<!-- Scrollable view here -->
<com.google.android.material.appbar.AppBarLayout
android:id="#+id/appBar"
android:layout_width="match_parent"
android:layout_height="#dimen/height335"
android:background="#drawable/ic_appbar_bg"
android:fitsSystemWindows="true"
app:elevation="0dp">
<com.google.android.material.appbar.CollapsingToolbarLayout
android:id="#+id/collapsingToolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
app:contentScrim="#color/colorPrimaryDark"
app:toolbarId="#+id/toolbar"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#android:color/transparent"
android:contentInsetStart="0dp"
android:contentInsetLeft="0dp"
android:gravity="center"
app:contentInsetEnd="0dp"
app:contentInsetEndWithActions="0dp"
app:contentInsetLeft="0dp"
app:contentInsetRight="0dp"
app:contentInsetStart="0dp"
app:contentInsetStartWithNavigation="2dp"
app:layout_collapseMode="pin"
app:theme="#style/ToolbarTheme">
<include
android:id="#+id/toolbar_header_view"
layout="#layout/widget_header_view_top"
android:layout_width="match_parent"
android:layout_height="wrap_content"
bind:cardDetails="#{viewModel}" />
</androidx.appcompat.widget.Toolbar>
<include
layout="#layout/widget_header"
bind:cardDetails="#{viewModel}" />
</com.google.android.material.appbar.CollapsingToolbarLayout>
</com.google.android.material.appbar.AppBarLayout>
<androidx.swiperefreshlayout.widget.SwipeRefreshLayout
android:id="#+id/swipe"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<!-- just a nestedscrollview
override fun onTouchEvent(ev: MotionEvent): Boolean {
return scrollable && super.onTouchEvent(ev)
}
override fun onInterceptTouchEvent(ev: MotionEvent): Boolean {
return scrollable && super.onInterceptTouchEvent(ev)
}
fun setScrollingEnabled(enabled: Boolean) {
scrollable = enabled
} -->
<com.android.utils.LockableNestedScrollView
android:id="#+id/nestedScrollView"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
android:clipChildren="false"
android:clipToPadding="false"
android:fillViewport="true">
<LinearLayout>
<Some views...
<androidx.fragment.app.FragmentContainerView
android:id="#+id/nav_host_fragment"
android:layout_width="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
android:layout_height="match_parent" />
</LinearLayout>
</com.android.utils.LockableNestedScrollView>
</androidx.swiperefreshlayout.widget.SwipeRefreshLayout>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/add"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="#{()->viewModel.fabClicked()}"
android:src="#drawable/ic_plus"
app:fabCustomSize="#dimen/fab70"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="1" />
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="#+id/nav_view"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="0dp"
android:layout_marginEnd="0dp"
android:background="?android:attr/windowBackground"
android:elevation="#dimen/elevation3"
android:paddingTop="#dimen/padding10"
app:itemTextAppearanceActive="#style/BottomNavigationViewTextStyle"
app:itemTextAppearanceInactive="#style/BottomNavigationViewTextStyle"
app:labelVisibilityMode="labeled"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:menu="#menu/nav_view" />
Fragment container will be replaced with fragments when nav bar items are clicked. The issue is that in one of the fragment I have a recyclerview. The onBindView of all the items in the recyclerview is getting invoked all at once. I need to avoid this mainly because I am trying to implement Pagination like this:
override fun onBindViewHolder(holder: TopUpViewHolder, position: Int) {
val item = myDataset[position]
holder.bind(item)
if (position == this.itemCount - 1){
// do your load more task here
viewModel.fetchTopUpData()
}
}
(I tried attaching scroll listener and implement pagination like this. But the canScrollVertically(1) is getting invoked even when the user has not reached the end, probably because of nestedscrollview itself.)
Here is my fragment with recyclerview:
<?xml version="1.0" encoding="utf-8"?>
<data>
<import type="android.view.View" />
<variable
name="viewmodel"
type="com.android.ui.topup.viewmodel.TopUpViewModel" />
</data>
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clipChildren="false"
android:clipToPadding="false"
android:padding="#dimen/padding15">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clipChildren="false"
android:clipToPadding="false"
android:orientation="vertical">
<androidx.constraintlayout.widget.ConstraintLayout
android:id="#+id/status_header"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingBottom="#dimen/padding20"
android:visibility="#{viewmodel.headerVisibility}">
<TextView
android:id="#+id/recentLabel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="#dimen/margin20"
android:text="#string/recent_top_ups"
android:textAllCaps="true"
android:textColor="#color/topup_label_text_color"
android:textSize="#dimen/text12"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/viewAll"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="#dimen/margin20"
android:onClick="#{()->viewmodel.viewAllClicked()}"
android:text="#string/view_all"
android:textColor="#color/topup_label_color_orenge"
android:textSize="#dimen/text14"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/topUpRCView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:nestedScrollingEnabled="false"
android:clipChildren="false"
android:clipToPadding="false"
app:scrollListener="#{viewmodel.scrollListener}" />
<ProgressBar
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:visibility="#{viewmodel.fetchingFlag?View.VISIBLE:View.GONE}" />
</LinearLayout>
<LinearLayout
android:id="#+id/empty_list"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="#{viewmodel.listEmpty}"
android:orientation="vertical">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:src="#drawable/ic_illustration_receipt"/>
<TextView
android:id="#+id/empty_list_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/you_have_no_topup_requests"
android:fontFamily="#font/colfaxregular"
android:textColor="#333547"
android:layout_marginTop="36dp"
android:textSize="#dimen/text16"
android:alpha=".3"/>
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
Things that I have tried:
Added android:nestedScrollingEnabled="false" in the recyclerview
Added app:layout_behavior="#string/appbar_scrolling_view_behavior"
Changed the height of recyclerview to match_parent wrap_content also 0 and set layout weight as 1(RCV is inside a linearlayout)
https://stackoverflow.com/a/44470106/6341943 => adding a header viewholder for some reason
https://stackoverflow.com/a/37558761/6341943 => cant do this because, I have a bottomnavbar
Now for the Weird part
If I keep my fragment inside a viewpager, for some reason the issue is not happening. (Even this hack is not usable is because it's messing up my collpsingToolbarLayout)
I have wasted at least a week behind this and the only solution that works is to remove the nestedscrollview. To make the recyclerview to actually recycle the view, you HAVE TO REMOVE the nestedscrollview. If you happen to have multiple views inside instead of just the recyclerview, You have to add them as items of the recyclerview by setting different viewholders, and then adding
app:layout_behavior="#string/appbar_scrolling_view_behavior"
to the recyclerview or the parent of recyclerview(the parent cannot have any other view other than Recyclerview for this to work).
In my case, the requirement was as follows:
<androidx.coordinatorlayout.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:fitsSystemWindows="true"
app:layout_constraintTop_toTopOf="parent">
<!-- Scrollable view here -->
<com.google.android.material.appbar.AppBarLayout
.... >
<com.google.android.material.appbar.CollapsingToolbarLayout
....>
<androidx.appcompat.widget.Toolbar
....>
<include
android:id="#+id/toolbar_header_view"
.... />
</androidx.appcompat.widget.Toolbar>
<include layout="#layout/widget_header" />
</com.google.android.material.appbar.CollapsingToolbarLayout>
</com.google.android.material.appbar.AppBarLayout>
<androidx.swiperefreshlayout.widget.SwipeRefreshLayout
....>
<LinearLayout orientation="vertical" ....>
<View .../> <!-- I needed to have these two views along with recyclerview and i wanted them to do nestedscroll along with recyclerview -->
<View .../>
<androidx.recyclerview.widget.RecyclerView
.... />
</androidx.swiperefreshlayout.widget.SwipeRefreshLayout>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
I needed to have two views before recyclerview and I wanted them to do nestedscroll along with recyclerview. The only thing that worked was by removing these to views and adding them as the first two items of recyclerview, and then adding
app:layout_behavior="#string/appbar_scrolling_view_behavior"
to the swipetorefresh layout
Hope this helps someone. I will add more info If required.

How to add NavHostFragment in a Fragment destination?

My goal is to understand and use the Navigation component in the best way with a complex navigation architecture (I suppose).
To make the global context, I use a main BottomNavigationBar with 5 items. For the management of the fragments associate, I use the example given by Google : https://github.com/googlesamples/android-architecture-components/tree/master/NavigationAdvancedSample.
But my case is a bit more complex than just a bottom bar. In one of the destinations from one of the fragments launched by the bottom bar, I have another RecyclerView menu and a fragment container to navigate between fragments. I put here the important part of my primary graph :
<?xml version="1.0" encoding="utf-8"?>
<navigation 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:id="#+id/main"
app:startDestination="#id/mainFragment">
<fragment
android:id="#+id/mainFragment"
android:name="com.exemple.fragment.MainFragment"
android:label="#string/main_label"
tools:layout="#layout/mainFragment">
<action
android:id="#+id/action_mainFragment_to_goScreen"
app:destination="#id/goScreen">
</action>
</fragment>
<fragment
android:id="#+id/goScreen"
android:name="com.exemple.fragment.GoFragment"
android:label="#string/goLabel"
tools:layout="#layout/fragment_go">
<action
android:id="#+id/action_goScreen_to_mainFragment"
app:destination="#id/mainFragment" />
<argument
android:name="arg1"
app:argType="com.exemple.customType"
android:defaultValue="#null"
app:nullable="true" />
<argument
android:name="arg2"
app:argType="string"
android:defaultValue="#null"
app:nullable="true" />
</fragment>
</navigation>
And the xml with the bottom bar which starts this graph :
<?xml version="1.0" encoding="utf-8"?>
<layout 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"
tools:context="com.exemple.MainActivity">
<RelativeLayout
android:id="#+id/constraintLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.appcompat.widget.Toolbar
android:id="#+id/fake_toolbar"
android:layout_width="0dp"
android:layout_height="0dp"/>
<androidx.fragment.app.FragmentTabHost
android:id="#+id/main_host_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#+id/bottom_navigation" />
<!-- navigation bottom -->
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="#+id/bottom_navigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="start"
android:layout_alignParentBottom="true"
android:background="#color/navigationBarColor"
app:itemIconTint="#color/textColorNavigationBar"
app:itemTextColor="#color/textColorNavigationBar"
app:menu="#menu/menu_bottom_navigation" />
</RelativeLayout>
</layout>
And here is an example of the graph corresponding to the go fragment (the destination ):
<?xml version="1.0" encoding="utf-8"?>
<navigation 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:id="#+id/go"
app:startDestination="#id/firstGoFragment">
<action android:id="#+id/action_to_firstGoFragment"
app:destination="#id/firstGoFragment"/>
<fragment
android:id="#+id/firstGoFragment"
android:name="com.exemple.go.firstGoFragment"
android:label="#string/firstGoFragmentLabel"
tools:layout="#layout/firstGoFragment" >
</fragment>
<action android:id="#+id/action_to_secondFragment"
app:destination="#id/secondFragment"/>
<fragment
android:id="#+id/secondFragment"
android:name="com.exemple.go.SecondFragment"
android:label="#string/secondFragmentLabel"
tools:layout="#layout/secondFragment" >
</fragment>
</navigation>
The associate xml is :
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:tools="http://schemas.android.com/tools"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/colorGreyLight"
android:clickable="true"
android:focusable="true">
<RelativeLayout
android:id="#+id/linearLayout3"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#color/colorPrimary"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<androidx.appcompat.widget.AppCompatImageView
android:id="#+id/quit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginStart="16dp"
android:paddingBottom="15dp"
android:paddingEnd="15dp"
android:paddingTop="15dp"
app:srcCompat="#drawable/ic_quit_white" />
<com.teedji.mobeelity.custom.CustomTextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="#string/go"
android:textColor="#color/colorWhite"
android:textSize="17sp"
android:textStyle="bold" />
</RelativeLayout>
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/goMenu"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="#color/colorWhite"
android:overScrollMode="never"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/linearLayout3" />
<!-- include fragment child container -->
<fragment
android:id="#+id/go_nav_host_fragment_container"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginTop="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/goMenu"
app:navGraph="#navigation/go"/>
</androidx.constraintlayout.widget.ConstraintLayout>
</layout>
Now, to navigate to the go screen I simply use
findNavController().navigate(MainFragmentDirections.actionMainFragmentToGoScreen(arg1, arg2))
or
findNavController().navigate(R.id. action_mainFragment_to_goScreen)
But when I am on the Go fragment, the navController the I find using findNavController() is still the mainFragment one. So the navigate() fonction didn't find the action id. To solve it, I had to change the navHost programaticaly in the GoFragment like this :
override fun onCreate(savedInstanceState: Bundle?) {
Log.i(LOG_TAG, "onCreate")
super.onCreate(savedInstanceState)
if( fragmentManager != null ) {
// If the Nav Host fragment exists, return it
val existingFragment = fragmentManager!!.findFragmentByTag(FRAGMENT_TAG) as NavHostFragment?
existingFragment?.let { navHostGoFragment = it }
// Otherwise, create it and return it.
if ( navHostGoFragment == null) {
navHostGoFragment = NavHostFragment.create(R.navigation.go)
fragmentManager!!.beginTransaction()
.add(R.id.go_nav_host_fragment_container, navHostGoFragment!!, FRAGMENT_TAG)
.commit()
}
}else {
Log.e(LOG_TAG, "fragmentManager is null so I can't find the fragment host")
}
}
and then use navHostGoFragment!!.navController.navigate(R.id.action_to_firstGoFragment) to navigate in the new container
But doing like this, my firstFragment is created twice (I can see it on my logs) and that generate some problems like Cannot add the same observer with different lifecycles for example ( I solve this with adding
if (model.getLiveData().hasObservers()) {
model.getLiveData().removeObserver(observer)
}
before
model.getLiveData().observe(viewLifecycleOwner, observer)
)
But I think I am not doing the Navigation part like I should...
Could you provide any help to make this work more efficiently with stability ?
Try to use go_nav_host_fragment_container.findNavController().navigate(), if you are using Kotlin Android Extensions or findViewById(R.id.go_nav_host_fragment_container).findNavController().navigate(), and see if it works.

LinearLayout works differently in ExpandableListView

I'm trying to implement a book contents selector using ExpandableListView, but I'm finding that LinearLayout seems to work differently when inside the ELV, than it does in an activity.
To illustrate what I am trying to do, here is where I am at so far:
Screen Capture
Notice when the text wraps to the next line, the TextView fills the available space and aligns the vertical line (and button in the groupView) to the right (section 1.1 and 3), but if the text does not wrap, the TextView only takes up as much space as it needs.
Here is the child view layout, the group view is similar but with a button.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#android:color/white" >
<View android:layout_width="3dp" android:layout_height="match_parent" android:background="#000000" />
<View android:layout_width="10dp" android:layout_height="match_parent" />
<TextView
android:id="#+id/sectionNumber"
android:layout_width="65sp"
android:layout_height="wrap_content"
android:textSize="18sp" />
<TextView
android:id="#+id/sectionTitle"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:textSize="18sp" />
<View android:layout_width="6dp" android:layout_height="match_parent" />
<View android:layout_width="3dp" android:layout_height="match_parent" android:background="#000000" />
</LinearLayout>
When I tried this outside of an ExpandableListView, it works as intended. What am I missing?
The problem was elsewhere in the fragment xml layout:
<ExpandableListView
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:id="#+id/expandableListView" />
layout_width was set to "wrap_content" and should have been "match_parent"

Android LinearLayout does not left align contents

I want to create a horizontal line of small images thumbnails on top of the display. They should be lined up from left to write (all floated left). When you click on a thumbnail, its bigger version should be displayed below this line. I decided to go with a horizontal LinearLayout (see the one with ID = galleryLayout). It should be a LinearLayout because I want to use it later within a HorizontalScrollView. Here is my layout code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:background="#ffffef3a"
android:orientation="vertical"
tools:context=".Gallery01">
<LinearLayout
android:id="#+id/galleryLayout"
android:orientation="horizontal"
android:gravity="left"
android:layout_width="match_parent"
android:layout_height="120dp"
android:background="#ffff3e34">
<ImageView
android:src="#drawable/pic02"
android:layout_gravity="left"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
<ImageView
android:id="#+id/image1"
android:scaleType="fitXY"
android:layout_width="320dp"
android:layout_height="320dp" />
</LinearLayout>
But the problem is that the image is displayed in the center of the layout as you can see here:
As you can see the gravity in the LinearLayout does not work and the image is displayed in the center horizontally. The gravity of the ImageView itself does not work as well (that is just an attempt to make it work!).
Do you guys have any idea what I am doing wrong? Thank you for help!!
I could manage to resolve the problem step by step. Here the results:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#000000"
xmlns:android="http://schemas.android.com/apk/res/android">
<HorizontalScrollView
android:layout_width="wrap_content"
android:layout_height="120dp"
xmlns:android="http://schemas.android.com/apk/res/android"
android:background="#ffffff">
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:gravity="left"
android:background="#000000"
xmlns:android="http://schemas.android.com/apk/res/android">
<ImageView
android:src="#drawable/pic01"
android:layout_width="120dp"
android:layout_height="120dp"
android:padding="10dp"
android:background="#000000" />
<ImageView
android:src="#drawable/pic05"
android:layout_width="120dp"
android:layout_height="120dp"
android:padding="10dp"
android:background="#000000" />
<ImageView
android:src="#drawable/pic03"
android:layout_width="120dp"
android:layout_height="120dp"
android:padding="10dp"
android:background="#000000" />
<ImageView
android:src="#drawable/pic04"
android:layout_width="120dp"
android:layout_height="120dp"
android:padding="10dp"
android:background="#000000" />
</LinearLayout>
</HorizontalScrollView>
<ImageView
android:src="#drawable/pic01"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
It works perfectly :-)

set ImageView above Textview

I just want to do a very simple think :
I want to put an ImageView on full screen with just a simple TextView on his Bottom, not Over but just on his bottom..
I tried some combination but nothing worked fine..
Here is my current basic XML code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<ImageView
android:id="#+id/imgset"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#color/white"
android:src="#drawable/creditview" />
<RelativeLayout
android:id="#+id/layoutimgset"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="This spot is for Ad"
android:textStyle="bold"
android:textColor="#color/black"
android:background="#color/white" />
</RelativeLayout>
</LinearLayout>
This only show the ImageView..
Try to use for your ImageView this:
android:layout_weight="1"
In this case you don't need RelativeLayout.
Or put all to RelativeLayout and use
android:layout_below="#+id/imgset"
for your TextView

Resources