I had nested LinearLayouts and after reading some doc I tried to switch to ConstraintLayout. But I did not find how to insert a view to just display a background.
So far I just set the background on the layout containing the items.
This is what the old nested structure looks like (with more nested items in other sub-layouts):
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#color/black"
android:gravity="center" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
... some margins and padding
android:background="#drawable/global_background" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_gravity="center"
android:background="#drawable/text_area_background" >
<TextView
android:id="#+id/Text1"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:gravity="center" />
<TextView
android:id="#+id/Text2"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:gravity="center" />
...
This way I was able to easily set a shape of my own as a background for the different groups of items I displayed.
How can I achieve the equivalent using ConstraintLayout?
I understand how I can constrain my items to get organized the same way, and how I could set the backgrounds to align with everything too. But how do I insert a simple background item?
I used ImageView to display my background and (hardly) found a way to assemble my items inside it.
One problem is that I get a warning Image without contentDescription.
<androidx.constraintlayout.widget.ConstraintLayout
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/constraintLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/black">
<ImageView
android:id="#+id/background"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginStart="10dp"
android:layout_marginLeft="10dp"
android:layout_marginTop="10dp"
android:layout_marginEnd="10dp"
android:layout_marginRight="10dp"
android:layout_marginBottom="10dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintDimensionRatio="2:5"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="1.0"
app:srcCompat="#drawable/global_background" />
...
<Button
android:id="#+id/buttonValidate"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginStart="10dp"
android:layout_marginLeft="10dp"
android:layout_marginTop="2dp"
android:layout_marginEnd="10dp"
android:layout_marginRight="10dp"
android:layout_marginBottom="8dp"
android:background="#drawable/green_button"
android:text="#string/validate"
app:layout_constraintBottom_toBottomOf="#+id/background"
app:layout_constraintDimensionRatio="15:6"
app:layout_constraintEnd_toEndOf="#+id/background"
app:layout_constraintStart_toStartOf="#+id/background"
app:layout_constraintTop_toBottomOf="#+id/upperButton" />
But I struggled to put another background inside (itself containing several TextView). My constraints were always messing one or the other... I ended up with a nested ConstraintLayout which is working fine, probably not the optimal solution but all my other attempts failed.
Related
first of all I am new to Android-Development.
My question is regards alignment of different views in Android Studio/Development.
Specifically the properly height-alignment of an icon and text.
Icon-Text-Alignment
As you can see, I tried to align the text with the icon. However the result looks slightly different in the emulator.
Here is my .xml-file:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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=".DashboardActivity">
<TextView
android:id="#+id/textView3"
android:layout_width="0dp"
android:layout_height="50dp"
android:layout_marginStart="32dp"
android:layout_marginTop="32dp"
android:layout_marginBottom="352dp"
android:fontFamily="#font/poppins_medium"
android:text="Dashboard"
android:textAlignment="viewStart"
android:textColor="#color/colorText"
android:textSize="30sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="#+id/imageView10"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.04" />
<ImageView
android:id="#+id/imageView10"
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_marginEnd="32dp"
app:layout_constraintBottom_toBottomOf="#+id/textView3"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#+id/textView3"
app:layout_constraintTop_toTopOf="#+id/textView3"
app:srcCompat="#drawable/ic_settings_black_24dp" />
</androidx.constraintlayout.widget.ConstraintLayout>
My questions are:
1. How can i fix the alignment of these two views?
2. Why is the result in the emulator different?
3. Is there a best-practice to align views properly?
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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=".DashboardActivity">
<TextView
android:id="#+id/textView3"
android:layout_width="0dp"
android:layout_height="50dp"
android:layout_marginStart="32dp"
android:layout_marginTop="32dp"
android:layout_marginBottom="352dp"
android:fontFamily="#font/poppins_medium"
android:text="Dashboard"
android:textAlignment="viewStart"
android:textColor="#color/colorText"
android:textSize="30sp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintEnd_toStartOf="#+id/imageView10" />
<ImageView
android:id="#id/imageView10"
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_marginEnd="32dp"
app:srcCompat="#drawable/ic_settings_black_24dp"
app:layout_constraintTop_toTopOf="#id/textView3"
app:layout_constraintBottom_toBottomOf="#id/textView3"
app:layout_constraintEnd_toEndOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
You can do this simply by using a custom toolbar and adding a menu to it.
Try using Custom toolbar :
<LinearLayout 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"
android:orientation="vertical"
tools:context=".terminalShortActivity">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#4EACE2"
app:popupTheme="#style/ThemeOverlay.AppCompat">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center_vertical"
android:orientation="horizontal">
<TextView
style="#style/TextAppearance.AppCompat.Widget.ActionBar.Title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Terminal Shortcuts"
android:textColor="#FFFFFF" />
</LinearLayout>
</androidx.appcompat.widget.Toolbar>
</LinearLayout>
So I dig into the alignment issue a little further and came up with a few "solutions". Generally speaking and to answer my questions the "Custom Toolbar" is not the right solution to align the views.
The problem lies in the padding of fonts. Android take the whole view to align views and not as assumed the "text" only. Therefore the alignment looks off.
Different paddings/fonts
Poppinsmedium: without padding
Poppinsmedium: with padding; normal state
Android-Font: with padding; normal state
The bottom-padding can be eliminated with the following code:
android:includeFontPadding="false"
Or check this thread for more in-depth knowledge of the issues of font-padding.
To align views, now I am using Chain-Constraints and do it without padding. It looks like the best-way to align views, especially Text-Views. However, I have to say that despite the deleting of the bottom padding it is necessary to adjust the alignment a littlebit with the vertical-bias.
For reference:
constraintlayout.com
Android-Doc: constrain-chain
I am trying to center the text in a TextView, which itself is contained in a constraint layout. The problem is, wrap_content does not wrap the text tightly enough, which causes it to be off-center. I tried all gravities, making it fill the parent and then use gravities, etc. and can't think of a solution and did not find anything useful when googling.
Problem can be seen well in the layout preview:
badge.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
android:orientation="vertical"
android:textAlignment="center"
tools:layout_height="32dp"
tools:layout_width="32dp">
<ImageView
android:id="#+id/badge_background"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="#drawable/circle_accent"
android:visibility="gone"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:visibility="visible"/>
<TextView
android:id="#+id/badge_counter"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:foregroundGravity="center"
android:gravity="center"
android:textAlignment="center"
android:textColor="#color/white"
android:visibility="gone"
app:layout_constraintBottom_toBottomOf="#+id/badge_background"
app:layout_constraintLeft_toLeftOf="#id/badge_background"
app:layout_constraintRight_toRightOf="#id/badge_background"
app:layout_constraintTop_toTopOf="#id/badge_background"
tools:text="21"
tools:visibility="visible" />
<ImageView
android:id="#+id/badge_watched_tick"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_watch"
android:visibility="gone"
app:layout_constraintBottom_toBottomOf="#+id/badge_background"
app:layout_constraintLeft_toLeftOf="#id/badge_background"
app:layout_constraintRight_toRightOf="#id/badge_background"
app:layout_constraintTop_toTopOf="#id/badge_background"/>
</androidx.constraintlayout.widget.ConstraintLayout>
Try to use round drawable as TextView background
After adding a ConstraintLayout inside a ScrollView, I noticed that the content remains stuck in the middle of the screen (both horizontally and vertically). I already tried add android:layout_gravity="top" to the main ConstraintLayout but that didn't work. Is there something else I can use to position the content at the top?
<?xml version="1.0" encoding="utf-8"?>
<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fillViewport="true">
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/cl_main"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingStart="#dimen/activity_horizontal_margin"
android:paddingEnd="#dimen/activity_horizontal_margin">
<androidx.cardview.widget.CardView
android:id="#+id/cv_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="30dp"
app:cardUseCompatPadding="true"
app:contentPadding="10dp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintBottom_toTopOf="#+id/tv_disclaimer">
<LinearLayout
android:id="#+id/ll_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<ImageView
android:id="#+id/iv_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:importantForAccessibility="no"
android:paddingEnd="10dp" />
<TextView
android:id="#+id/tv_title"
style="#android:style/TextAppearance.Medium"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="?android:attr/textColorPrimary" />
</LinearLayout>
</androidx.cardview.widget.CardView>
<TextView
android:id="#+id/tv_disclaimer"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp"
android:gravity="center"
android:textColor="?android:attr/textColorPrimary"
app:layout_constraintTop_toBottomOf="#+id/cv_title"
app:layout_constraintBottom_toTopOf="#+id/cv_description"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
style="#android:style/TextAppearance.Medium" />
<androidx.cardview.widget.CardView
android:id="#+id/cv_description"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:cardUseCompatPadding="true"
app:contentPadding="10dp"
app:layout_constraintTop_toBottomOf="#+id/tv_disclaimer"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent">
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/cl_description"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:id="#+id/ll_allergies"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintBottom_toTopOf="#+id/ll_ingredients">
<ImageView
android:id="#+id/iv_allergies"
android:importantForAccessibility="no"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingEnd="5dp"/>
<TextView
android:id="#+id/tv_allergies"
style="#android:style/TextAppearance.Large"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:textColor="?android:attr/textColorPrimary" />
</LinearLayout>
<LinearLayout
android:id="#+id/ll_allergyinfo"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintTop_toBottomOf="#+id/ll_allergies"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintBottom_toTopOf="#+id/ll_ingredients">
<TextView
android:id="#+id/tv_allergyinfo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="?android:attr/textColorPrimary"
android:layout_marginBottom="2dp"
android:gravity="start"
style="#android:style/TextAppearance.Medium" />
</LinearLayout>
<LinearLayout
android:id="#+id/ll_ingredients"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintTop_toBottomOf="#+id/ll_allergyinfo"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintBottom_toBottomOf="parent">
<ImageView
android:id="#+id/iv_ingredients"
android:importantForAccessibility="no"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingEnd="5dp" />
<TextView
android:id="#+id/tv_ingredients"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:textColor="?android:attr/textColorPrimary"
style="#android:style/TextAppearance.Large" />
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.cardview.widget.CardView>
</androidx.constraintlayout.widget.ConstraintLayout>
</ScrollView>
Current result
Two important things are going on here.
The first is that your ScrollView specifies android:fillViewport="true". This means that whenever the contents of the ScrollView are "smaller" than the screen size, they will be stretched to fill the screen. In other words, your wrap_content ConstraintLayout will only actually wrap its content when you have to scroll. In all other cases, your ConstraintLayout will functionally be match_parent in height.
The second is that the constraints on your CardView, TextView, and second CardView form a vertical chain. Chains have special behavior regarding spacing when the parent is larger than the sum of the views in the chain (which it is due to the fillViewport behavior discussed above); the default is "spread", which will position the three views such that all the remaining space is evenly divided into four chunks (one at the start of the chain, one between the first two views, one between the second two views, and the last at the end of the chain).
How to fix it, though?
The best thing to do is to break the chain. Assuming you just want the views all stacked one after the other, starting from the top of the screen, there's no need to use a chain. To break the chain, remove the bottom constraint from each view:
<?xml version="1.0" encoding="utf-8"?>
<ScrollView
...>
<androidx.constraintlayout.widget.ConstraintLayout
...>
<androidx.cardview.widget.CardView
android:id="#+id/cv_title"
...
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent">
...
</androidx.cardview.widget.CardView>
<TextView
android:id="#+id/tv_disclaimer"
...
app:layout_constraintTop_toBottomOf="#+id/cv_title"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"/>
<androidx.cardview.widget.CardView
android:id="#+id/cv_description"
...
app:layout_constraintTop_toBottomOf="#+id/tv_disclaimer"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent">
...
</androidx.cardview.widget.CardView>
</androidx.constraintlayout.widget.ConstraintLayout>
</ScrollView>
Alternatively, you could delete the fillViewport attribute from your ScrollView. Without this, the child ConstraintLayout won't ever be stretched to fill the screen, and wrap_content will mean that there's never any extra space to spread out between your chain views.
Try removing app:layout_constraintTop_toTopOf="parent" from your ll_allergies LinearLayout. When copied on my AS it was this line that was adding the unnecessary space between the textview and the layout. Alternatively, keep the constraint and add 0dp on its height so that it enforces the constraint.
UPDATE after comment: I think your views are overlapping because the bottom constraint of ll_allergies is on the top of ll_ingredients instead of ll_allergyinfo. Try changing this:
app:layout_constraintBottom_toTopOf="#id/ll_ingredients"
to this:
app:layout_constraintBottom_toTopOf="#id/ll_allergyinfo"
and bring back the wrap_content of ll_alergies. Hopefully, now everything will fall into place
Update: response no longer valide after the code was updated
There are some errors in your code:
1.you set the layout to be to bottom of itself
android:id="#+id/ll_ingredients"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintTop_toBottomOf="#+id/ll_ingredients"`
the id "ll_alighting" is not defined
I am using the following layouts:
<merge
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<VideoView
android:layout_width="match_parent"
android:layout_height="match_parent" />
<ProgressBar
android:visibility="invisible"
android:id="#+id/progress"
android:layout_gravity="center"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<LinearLayout
android:id="#+id/llSearch"
android:visibility="visible"
android:background="#50AAAAAA"
android:paddingTop="10dp"
android:gravity="center_vertical"
android:paddingBottom="10dp"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="72dp">
<ImageView
android:layout_marginLeft="16dp"
android:layout_marginStart="16dp"
android:src="#drawable/abc_ic_search_api_mtrl_alpha"
android:layout_width="40dp"
android:layout_height="40dp" />
<EditText
android:textColor="#android:color/white"
android:textColorHint="#android:color/white"
android:background="#android:color/transparent"
android:visibility="visible"
android:maxLines="1"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
<android.support.v7.widget.RecyclerView
android:visibility="invisible"
android:layout_marginTop="72dp"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<android.support.v7.widget.RecyclerView
android:visibility="gone"
android:layout_marginTop="72dp"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<com.myapp.custom.RevealView
android:id="#+id/reveal"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</merge>
When running the app through DDMS, I've noticed that the layout ends up being measured twice, why is this and how can I prevent overdraw?
What's also strange is that I can't figure out where the other LinearLayouts are coming from.
Measuring twice isnt overdraw. Depending on the type of layout you're using Android might need to measure it twice because of the relationship between child views require it. This can happen with layouts like LinearLayout or RelativeLayout. For exact reason you need to check the source of those, but its hardly an issue (usually).
But if you have something like a recycleview you should avoid using big nested layouts inside.
I have a FrameLayout that consists of a list view and a button. The whole point of the FrameLayout is that elements that are after other elements will be displayed above them.
Since the button code is below the ListView code, I expected the button will always be on top, but it isn't. I can't figure it out - as soon as I get enough items in my list, the button is underneath it and it becomes obsolete.
XML:
<FrameLayout
android:id="#+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ListView
android:id="#+id/lvMovies"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:background="#fff"
android:elevation="3dp"
android:paddingTop="8dp" />
<Button
android:id="#+id/btnAddMovie"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_gravity="bottom|end"
android:layout_marginBottom="16dp"
android:layout_marginEnd="16dp"
android:layout_marginRight="16dp"
android:background="#drawable/raised_action_button"
android:elevation="5dp"
android:fontFamily="sans-serif-light"
android:gravity="center"
android:text="+"
android:textColor="#ffffff"
android:textSize="30sp" />
</FrameLayout>
From developer.android:
FrameLayout is designed to block out an area on the screen to display
a single item. Generally, FrameLayout should be used to hold a single
child view,
The current dimensions of the framelayout is the entire screen. If I was to use the entire screen for the above layout I would do something like the following:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="5"
android:orientation="horizontal">
<ListView
android:id="#+id/lvMovies"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:background="#fff"
android:elevation="3dp"
android:paddingTop="8dp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:orientation="horizontal">
<Button
android:id="#+id/btnAddMovie"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_gravity="bottom|end"
android:layout_marginBottom="16dp"
android:layout_marginEnd="16dp"
android:layout_marginRight="16dp"
android:background="#drawable/raised_action_button"
android:elevation="5dp"
android:fontFamily="sans-serif-light"
android:gravity="center"
android:text="+"
android:textColor="#ffffff"
android:textSize="30sp" />
</LinearLayout>
</LinearLayout>
You can say 0dp weight for either a height or a width, but not both. You then team it up with a layout_weight. In this case the first nested linear layout takes up 5/6ths of the screen, the second 1/6th. Thus your button sits in a protected space that the list view will not block out.
The outer linear layout has a vertical orientation which makes the two inner layouts stack on top of each other, the inners are horizontal to make them go across the entire screen. You will need to tweak those weights to make it work for you.
You can use RelativeLayout for this. If you want button view over the listview android:layout_above="#+id/btnAddMovie" delete this line.
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ListView
android:id="#+id/lvMovies"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#+id/btnAddMovie"
android:layout_marginBottom="8dp"
android:background="#fff"
android:elevation="3dp"
android:paddingTop="8dp" />
<Button
android:id="#+id/btnAddMovie"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_alignParentBottom="true"
android:layout_gravity="bottom|end"
android:layout_marginBottom="16dp"
android:layout_marginEnd="16dp"
android:layout_marginRight="16dp"
android:elevation="5dp"
android:fontFamily="sans-serif-light"
android:gravity="center"
android:text="+"
android:textColor="#ffffff"
android:textSize="30sp" />
</RelativeLayout>
Remove the elevation property from the list view. That's it.
It seems like the elevation causes the element to be on top of other elements.