Develop Reference

Put on the bottom elements in an App on Android Studio

I have an issue with my App on Android Studio.
I want to know how can I put on the bottom of my layout (in a fixed position) without ruining the structure on various smartphones. I'm using a Linear Layout and the elements to put at the bottom are :
Edit-text (comments area) + Button "Send comment" in the right of the Edit-Text. Thank you.

Ideal approach is to use a ConstraintLayout, because it will give you a lot of options to do that. Using a LinearLayout if the linear layout height is match parent. You can set the item property of gravity=bottom.
Sample Code of constraint layout
<androidx.constraintlayout.widget.ConstraintLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<EditText
android:id="#+id/editText"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="16dp"
android:background="#drawable/bg_input"
android:hint="Taper votre message"
android:padding="16dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="#+id/button"
app:layout_constraintStart_toStartOf="parent" />
<Button
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="16dp"
android:background="#drawable/bg_button"
android:text="Send"
android:textColor="#android:color/white"
app:layout_constraintBottom_toBottomOf="#+id/editText"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="#+id/editText" />
</androidx.constraintlayout.widget.ConstraintLayout>

Maybe you can use a new Layout called ConstraintLayout. You have to put this new layout at the same level as your linear layout and it will not destroy your work.

Inexplicable white/blank space in Android app, not showing in layout preview

The preview looks fine, but the app runs differently. In the layout inspector, there is simply nothing where this weird white space is. It seems to be a problem with ConstraintLayout + ViewPager. I had the same issue in three places, all with same ViewPager, 0dp vertical size setup. I have solved by converting ConstraintLayouts into LinearLayouts. But the question is why do I need to regress to a LinearLayout? I originally wrote the UI with ConstraintLayout, and ViewPager, it was fine. Somewhere along the way, without touching the code, things turned weird and this blank space showed up. As if something in Android UI rendering changed under the hood. Anyone have any idea what it is, or how to solve while keeping a ConstraintLayout?
Here is the layout inspector image of the app running on a device. I have clearly marked the problematic white space with my mouse calligraphy skills.
Here is the layout preview for the following xml code, note UI elements fill the screen, no white space after the bottom toolbar in this view, unlike live app. Don't mind the colour difference, the app changes colours at run time.
fragment_layout.xml (Between green and marked blank space in live app image, the rest of UI is from activity, but I know that's not the problem, so won't add the xml for that)
<?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">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ui.order.OrderBuildFragment"
>
<com.google.android.material.tabs.TabLayout
android:id="#+id/order_tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabMode="fixed"
app:layout_constraintBottom_toTopOf="#+id/order_viewpager"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"/>
<androidx.viewpager.widget.ViewPager
android:id="#+id/order_viewpager"
android:layout_width="match_parent"
android:layout_height="0dp"
android:background="#android:color/white"
app:layout_constraintTop_toBottomOf="#id/order_tabs"
app:layout_constraintBottom_toTopOf="#id/build_order_bottom_toolbar"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent">
</androidx.viewpager.widget.ViewPager>
<androidx.constraintlayout.widget.ConstraintLayout
android:id="#+id/build_order_bottom_toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintTop_toBottomOf="#id/order_viewpager"
app:layout_constraintBottom_toBottomOf="parent"
android:background="?attr/colorPrimary"
>
<TextView
android:id="#+id/order_service_point_spinner_label"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="#string/service_point"
android:textColor="#color/white"
app:layout_constraintEnd_toStartOf="#id/order_toolbar_service_point_spinner"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toTopOf="#id/build_order_guideline_service_point_and_action_buttons"
app:layout_constraintStart_toStartOf="parent"
android:layout_marginStart="8dp"
/>
<androidx.appcompat.widget.AppCompatSpinner
android:id="#+id/order_toolbar_service_point_spinner"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toTopOf="#id/build_order_guideline_service_point_and_action_buttons"
app:layout_constraintStart_toEndOf="#id/order_service_point_spinner_label"
android:layout_marginEnd="8dp"/>
<androidx.constraintlayout.widget.Guideline
android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/build_order_guideline_service_point_and_action_buttons"
app:layout_constraintGuide_percent="0.5"
/>
<TextView
android:id="#+id/order_textView_price"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:text="#{#string/currency_symbol + viewModel.price}"
android:textColor="#color/white"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="#id/order_toolbar_button_more"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#id/build_order_guideline_service_point_and_action_buttons"
tools:text="$999.99"
/>
<Button
android:id="#+id/order_toolbar_button_more"
style="?android:attr/borderlessButtonStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="moreButtonAction"
android:text="#string/more"
android:textColor="#color/white"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="#id/order_toolbar_button_send"
app:layout_constraintStart_toEndOf="#id/order_textView_price"
app:layout_constraintTop_toBottomOf="#id/build_order_guideline_service_point_and_action_buttons"/>
<Button
android:id="#+id/order_toolbar_button_send"
style="?android:attr/borderlessButtonStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="sendButtonAction"
android:text="#{viewModel.sendButtonText}"
android:textColor="#color/white"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#id/order_toolbar_button_more"
app:layout_constraintTop_toBottomOf="#+id/build_order_guideline_service_point_and_action_buttons"
tools:text="#string/send"/>
</androidx.constraintlayout.widget.ConstraintLayout>
<androidx.core.widget.ContentLoadingProgressBar
android:id="#+id/build_order_progress_bar"
style="?android:attr/progressBarStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:visibility="#{safeUnbox(viewModel.loading)}"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
/>
</androidx.constraintlayout.widget.ConstraintLayout>
</layout>
My Linear layout solution simply included replacing ConstraintLayout with a LinearLayout, removing all constraints from child elements and adding orientation: "vertical" (of course) plus putting layout_weight: 1 in the ViewPager element. If that helps anyone.

My guess is that you are using androidx.constraintlayout:constraintlayout:2.0.0-beta2.
This specific version is known to cause issues like this.
Update to the latest version ('androidx.constraintlayout:constraintlayout:2.0.0-beta6' at the time of writing).

FAB 2 coloured icon

I am using a FAB widget and I want to add a 2 coloured icon in it. Is that possible? This is my current code right now:
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/notificationFAB"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:fabSize="mini"
android:tintMode="multiply"
android:backgroundTint="#color/colorWhite"
android:layout_marginTop="5dp"
app:tint="#color/colorPrimaryLight"
app:rippleColor="#color/colorPrimary"
android:layout_marginHorizontal="10dp"
android:src="#drawable/active_notif_final"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:borderWidth="0dp"
/>
I did a workaround: made the colors of the icon light and added tintMode as multiply to get the original color. But it still doesn't look good.
workaround
Original
<com.google.android.material.floatingactionbutton.ExtendedFloatingActionButton
android:id="#+id/notificationFAB"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:backgroundTint="#color/colorWhite"
android:layout_marginTop="5dp"
app:rippleColor="#color/colorPrimary"
android:layout_marginHorizontal="10dp"
app:icon="#drawable/active_notif_final"
app:iconTint="#color/colorPrimaryLight"
app:iconTintMode="multiply"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:borderWidth="0dp"
/>
with extended FAB:

By default, the icon (app:srcCompat) is tinted with the app:tint color as per the FloatingActionButton documentation.
You can disable this behavior by adding app:tint="#null" to your fab:
<com.google.android.material.floatingactionbutton.FloatingActionButton
app:srcCompat="#drawable/..."
app:tint="#null"
.../>
In the ExtendedFloatingActionButton the app:icon is tinted with the app:iconTint:
<com.google.android.material.floatingactionbutton.ExtendedFloatingActionButton
app:icon="#drawable/...."
app:iconTint="#null"
.../>

ExtendedFloatingActionButton - how to achieve same height when button is extended as when it's shrank

I'm using latest material components - 1.1.0-beta01.
When ExtendedFloatingActionButton expands, its height also reduces.
Here is how xml layout looks:
<?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:id="#+id/main_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<com.google.android.material.floatingactionbutton.ExtendedFloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="56dp"
android:text="Text"
android:textColor="#02220D"
android:backgroundTint="#F2C203"
style="#style/Widget.MaterialComponents.ExtendedFloatingActionButton"
android:textSize="15sp"
android:fontFamily="sans-serif-medium"
android:textStyle="normal"
android:layout_marginBottom="16dp"
android:layout_marginEnd="16dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:iconTint="#02220D"
app:icon="#drawable/ic_camera"
app:iconPadding="10dp"
android:insetLeft="0dp"
android:insetBottom="0dp"
android:insetTop="0dp"
android:insetRight="0dp"
/>
</androidx.constraintlayout.widget.ConstraintLayout>
I tried to set min and max height, but it didn't work. Any idea how to achieve the same height when button is expanded and shrank?
Thanks.

The ExtendedFloatingActionButton is a MaterialButton.
You can use the android:minHeight attribute:
<com.google.android.material.floatingactionbutton.ExtendedFloatingActionButton
android:minHeight="56dp"
../>
Otherwise you can define a custom style:
<style name="CustomExtendedFloating" parent="Widget.MaterialComponents.ExtendedFloatingActionButton.Icon">
<item name="android:minHeight">56dp</item>
</style>

Try setting app:collapsedSize property with your required size
app:collapsedSize="56dp"

Instead of hardcoded value use the one provided by the material library :
<com.google.android.material.floatingactionbutton.ExtendedFloatingActionButton
android:minHeight="#dimen/design_fab_size_normal"

It's worth noting, according to the spec for FAB and Extended FAB, in the extended state, it's not as tall. https://material.io/components/buttons-floating-action-button/#specs

How to add label next to elements of circular floating action menu?

I added circular floating action menu to my app but I can't find anywhere option to add label to elements. Can some has any idea how to add text?
I used this tutorial:
http://androidlift.info/2015/10/12/create-floating-action-button-fab-android/

Circular floating menu can be created easily in ConstraintLayout. layout_constraintCircle, layout_constraintCircleAngle, layout_constraintCircleRadius this property of ConstraintLayout will help you to create circular positioning of views.
Check this official documentation.
layout_constraintCircle is for the id of the center view
layout_constraintCircleAngle is for the angle of the circular positioning view
layout_constraintCircleRadius is for the radius of the circle.
This is a sample xml code for Arc menu:
<android.support.constraint.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=".CircularPositioningActivity">
<android.support.design.widget.FloatingActionButton
android:id="#+id/fabMenu"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="16dp"
android:layout_marginEnd="16dp"
android:layout_marginRight="16dp"
android:clickable="true"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:srcCompat="#drawable/ic_menu_white_24dp" />
<android.support.design.widget.FloatingActionButton
android:id="#+id/fabAttachFile"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:clickable="true"
app:layout_constraintCircle="#id/fabMenu"
app:layout_constraintCircleAngle="270"
app:layout_constraintCircleRadius="100dp"
app:srcCompat="#drawable/ic_attach_file_white_24dp"
/>
<android.support.design.widget.FloatingActionButton
android:id="#+id/fabAudio"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:clickable="true"
app:layout_constraintCircle="#id/fabMenu"
app:layout_constraintCircleAngle="315"
app:layout_constraintCircleRadius="100dp"
app:srcCompat="#drawable/ic_audiotrack_white_24dp" />
<android.support.design.widget.FloatingActionButton
android:id="#+id/fabCamera"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:clickable="true"
app:layout_constraintCircle="#id/fabMenu"
app:layout_constraintCircleAngle="0"
app:layout_constraintCircleRadius="100dp"
app:srcCompat="#drawable/ic_camera_alt_white_24dp" />
<android.support.constraint.Group
android:id="#+id/group"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:constraint_referenced_ids="fabAttachFile,fabCamera,fabAudio"
/>
</android.support.constraint.ConstraintLayout>
This is how it look like
can't find anywhere option to add label to elements
You can replace each circular positioning views with viewgroup or different layout for adding multiple view. This is the easiest way to do with out any library.