Develop Reference

Wrong placement of button inside linear layout

I have three textviews with drawableleft on them in horizontal orientation of linear layout and trying to show first #+id/tv_video_call view then tv_language and showing correctly on the android studio preview and does not change its position inside the class.
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:orientation="horizontal">
<TextView
android:id="#+id/tv_video_call"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
android:layout_marginEnd="7dp"
android:drawableLeft="#drawable/ic_video"
android:drawablePadding="10dp"
android:gravity="center"
android:text="Video Call"
android:textColor="#color/white"
android:textScaleX="1.2"
android:textSize="16sp"
android:textStyle="bold" />
<View
android:id="#+id/vertical_line"
android:layout_width="2dp"
android:layout_height="22dp"
android:layout_marginStart="5dp"
android:layout_marginTop="5dp"
android:layout_marginEnd="3dp"
android:layout_marginBottom="5dp"
android:layout_toStartOf="#id/tv_language"
android:background="#color/white"
android:paddingTop="2dp"
android:textStyle="bold" />
<TextView
android:id="#+id/tv_language"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="7dp"
android:layout_marginTop="4dp"
android:layout_marginEnd="7dp"
android:layout_marginRight="15dp"
android:layout_toLeftOf="#id/tv_logout"
android:drawableLeft="#drawable/ic_language"
android:drawablePadding="10dp"
android:gravity="center"
android:text="#string/logout"
android:textColor="#color/white"
android:textScaleX="1.2"
android:textSize="16sp"
android:textStyle="bold" />
<View
android:id="#+id/logoutline"
android:layout_width="2dp"
android:layout_height="22dp"
android:layout_marginStart="5dp"
android:layout_marginTop="5dp"
android:layout_marginEnd="3dp"
android:layout_marginBottom="5dp"
android:layout_toStartOf="#id/tv_language"
android:background="#color/white"
android:paddingTop="2dp"
android:textStyle="bold" />
<TextView
android:id="#+id/tv_logout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_marginStart="7dp"
android:layout_marginTop="4dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="6dp"
android:drawableLeft="#drawable/logouticon"
android:gravity="center"
android:text="#string/logout"
android:textColor="#color/white"
android:textScaleX="1.2"
android:textSize="16sp"
android:textStyle="bold"
android:visibility="visible" />
</LinearLayout>
but the emulator is showing the first textview after the second one having no idea what causes it to shift to that place.

Try to set buttons width with 0dp and set weight to 1 for them to divide equally in the layout.
Right now you have set width to wrap content which means that if those 2 buttons can't fit at the same time, one of them will be shift out.

About the constraint layout height

The below picture is the output I wanted to make:
I have already gone through
How to set a view's height match parent in ConstraintLayout?
and
https://developer.android.com/reference/android/support/constraint/ConstraintLayout
What I have done is I have made a constrain layout as the main parent layout and inside that, I had mad a relative layout with the circle as background and Image on top.
And also the rectangular top curved corners one is in the background of a constraint layout. Now what I am not getting is the height of this constraint layout the bottom of this should touch the bottom of the screen but as soon as I declare the height as match parent it occupies the whole screen from top to bottom. Below is my XML code.
<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:background="#color/silver"
tools:context=".ResetPassword">
<RelativeLayout
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_marginLeft="20dp"
android:layout_marginStart="20dp"
android:layout_marginTop="20dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:background="#drawable/circle_shape"
>
<ImageView
android:id="#+id/iv_reset_bck"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:src="#drawable/ic_arrow_back_black_24dp"></ImageView>
</RelativeLayout>
<RelativeLayout
android:id="#+id/rl_reset_topImage"
android:layout_width="200dp"
android:layout_height="200dp"
android:layout_marginTop="40dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.498"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:background="#drawable/circle_shape">
<ImageView
android:id="#+id/iv_reset"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_alignParentBottom="true"
android:layout_marginBottom="20dp"
app:srcCompat="#mipmap/ic_launcher_round" />
</RelativeLayout>
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:background="#drawable/bg_rectangle"
android:paddingLeft="5dp"
android:paddingTop="5dp"
android:paddingRight="5dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toBottomOf="#+id/rl_reset_topImage">
<LinearLayout
android:id="#+id/welcomeLoginLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:layout_editor_absoluteY="5dp">
<com.example.portfolio.CustomViews.PopinsBoldTextView
android:id="#+id/tv_welcome"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="43dp"
android:layout_marginLeft="43dp"
android:layout_marginTop="44dp"
android:text="#string/welcome"
android:textColor="#color/black"
android:textSize="26sp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<com.example.portfolio.CustomViews.PopinsBoldTextView
android:id="#+id/tv_logintext_msg"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="43dp"
android:layout_marginLeft="43dp"
android:text="#string/loginwith"
android:textColor="#color/black"
android:textSize="20sp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</LinearLayout>
<RelativeLayout
android:id="#+id/emailRelativeLayout"
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_marginStart="40dp"
android:layout_marginLeft="40dp"
android:layout_marginTop="20dp"
android:layout_marginEnd="40dp"
android:layout_marginRight="40dp"
android:background="#drawable/bg_email_rect"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/welcomeLoginLayout">
<EditText
android:id="#+id/et_email"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginStart="20dp"
android:layout_marginLeft="20dp"
android:layout_marginEnd="20dp"
android:layout_marginRight="20dp"
android:background="#android:color/transparent"
android:hint="#string/prompt_email"
android:paddingTop="5dp"
android:textSize="20sp"
android:paddingBottom="5dp"
android:textColorHint="#color/dark_gey"></EditText>
</RelativeLayout>
<RelativeLayout
android:id="#+id/passwordlRelativeLayout"
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_marginStart="40dp"
android:layout_marginLeft="40dp"
android:layout_marginTop="20dp"
android:layout_marginEnd="40dp"
android:layout_marginRight="40dp"
android:background="#drawable/bg_email_rect"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/emailRelativeLayout">
<EditText
android:id="#+id/et_password"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginStart="20dp"
android:layout_marginLeft="20dp"
android:layout_marginEnd="20dp"
android:layout_marginRight="20dp"
android:background="#android:color/transparent"
android:hint="#string/prompt_password"
android:textSize="20sp"
android:paddingTop="5dp"
android:paddingBottom="5dp"
android:textColorHint="#color/dark_gey"></EditText>
</RelativeLayout>
<RelativeLayout
android:id="#+id/login_btnLayout"
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_marginStart="40dp"
android:layout_marginLeft="40dp"
android:layout_marginTop="20dp"
android:layout_marginEnd="40dp"
android:layout_marginRight="40dp"
android:background="#drawable/bg_btn"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/passwordlRelativeLayout">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="Login"
android:textColor="#FFF"
android:textSize="20dp"
android:textStyle="bold"></TextView>
</RelativeLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
This is what I get the output from the above code
How can I make it as the above image?

As mentioned in the comment, you do not need to setup parent Layouts inside ConstraintLayout as ConstraintLayout is pretty powerful and can easily achieve what you want. What you are lacking is good use of constraints, and you are trying to compensate that by using RelativeLayout. Having a ConstraintLayout inside a ConstraintLayout is an overkill.
I have not created the BottomSheet for you ResetPassword, but that is something you can work on yourself as its simply an arrangement of elements or bringing in a customView. My point is to simply use one ConstraintLayout as the parent that will manage all the ViewGroups, and refrain from using any other Layouts inside it.
Design preview
XML Layout 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">
<ImageView
android:id="#+id/imageView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.25"
tools:srcCompat="#tools:sample/avatars" />
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="100dp"
android:text="Reset your password"
app:layout_constraintEnd_toEndOf="#+id/imageView2"
app:layout_constraintStart_toStartOf="#+id/imageView2"
app:layout_constraintTop_toBottomOf="#+id/imageView2" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:text="Reset your password to use app"
app:layout_constraintEnd_toEndOf="#+id/textView"
app:layout_constraintStart_toStartOf="#+id/textView"
app:layout_constraintTop_toBottomOf="#+id/textView" />
<EditText
android:id="#+id/editTextTextPersonName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="100dp"
android:ems="10"
android:inputType="textPersonName"
android:text="Name"
app:layout_constraintEnd_toEndOf="#+id/textView2"
app:layout_constraintStart_toStartOf="#+id/textView2"
app:layout_constraintTop_toBottomOf="#+id/textView2" />
<EditText
android:id="#+id/editTextTextPassword"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:hint="Password"
android:inputType="textPassword"
app:layout_constraintEnd_toEndOf="#+id/editTextTextPersonName"
app:layout_constraintStart_toStartOf="#+id/editTextTextPersonName"
app:layout_constraintTop_toBottomOf="#+id/editTextTextPersonName" />
<Button
android:id="#+id/button"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="Button"
app:layout_constraintEnd_toEndOf="#+id/editTextTextPassword"
app:layout_constraintStart_toStartOf="#+id/editTextTextPassword"
app:layout_constraintTop_toBottomOf="#+id/editTextTextPassword" />
</androidx.constraintlayout.widget.ConstraintLayout>

Hello friends how achieve bottom media controller layout?

Hello friends i am beginner in android i want know how to achieve this type layout the image which shown below please help me i trying achieve this type of layout

It is very simple layout FYI
It can be done with any type of parent layout Constraint, Relative and
even with Linear
I will share a Relative one example. Use your own drawables and assests.
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/relativeLayoutMain"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#android:color/black"
android:padding="4dp">
<TextView
android:id="#+id/textViewSongTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_marginStart="24dp"
android:layout_marginEnd="10dp"
android:layout_toStartOf="#+id/buttonBackward"
android:ellipsize="end"
android:maxLines="1"
android:padding="2dp"
android:text="Song Name - [details]"
android:textColor="#android:color/white"
android:textSize="12sp"
android:textStyle="bold" />
<TextView
android:id="#+id/textViewArtistName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/textViewSongTitle"
android:layout_alignParentStart="true"
android:layout_marginStart="24dp"
android:layout_marginEnd="10dp"
android:layout_toStartOf="#+id/buttonBackward"
android:padding="2dp"
android:text="Singer Name"
android:textColor="#android:color/white"
android:textSize="12sp" />
<Button
android:id="#+id/buttonForward"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_alignParentEnd="true"
android:layout_centerVertical="true"
android:layout_marginEnd="8dp"
android:background="#android:color/holo_green_dark"
android:gravity="center"
android:text="F"
android:textColor="#android:color/white" />
<Button
android:id="#+id/buttonPlayAndStop"
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_centerVertical="true"
android:layout_marginEnd="8dp"
android:layout_toStartOf="#id/buttonForward"
android:background="#android:color/holo_green_dark"
android:gravity="center"
android:text="PS"
android:textColor="#android:color/white" />
<Button
android:id="#+id/buttonBackward"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_centerVertical="true"
android:layout_marginEnd="8dp"
android:layout_toStartOf="#id/buttonPlayAndStop"
android:background="#android:color/holo_green_dark"
android:gravity="center"
android:text="B"
android:textColor="#android:color/white" />
</RelativeLayout>

textview color and order not working

I have a problem with the following xml file:
<?xml version="1.0" encoding="utf-8"?>
<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"
android:background="#drawable/search_list_leaf"
tools:context=".Flowers_List">
<TextView
android:id="#+id/A"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentTop="true"
android:layout_centerVertical="true"
android:text="A"
android:textSize="30sp"
tools:layout_editor_absoluteX="16dp"
tools:layout_editor_absoluteY="56dp" />
<TextView
android:id="#+id/B"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="B"
android:textSize="30sp"
tools:layout_editor_absoluteX="16dp"
tools:layout_editor_absoluteY="112dp" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="SEARCH YOUR FLOWER"
android:textColor="#030303"
android:textSize="30sp"
tools:layout_editor_absoluteX="32dp"
tools:layout_editor_absoluteY="0dp" />
<TextView
android:id="#+id/C"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="C"
android:textSize="30sp"
tools:layout_editor_absoluteX="16dp"
tools:layout_editor_absoluteY="179dp" />
<TextView
android:id="#+id/D"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="D"
android:textSize="30sp"
tools:layout_editor_absoluteX="16dp"
tools:layout_editor_absoluteY="241dp" />
<TextView
android:id="#+id/E"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="E"
android:textSize="30sp"
tools:layout_editor_absoluteX="16dp"
tools:layout_editor_absoluteY="310dp" />
The problem is that, even if I change color with the command android:textColor="#color/colorIwant" I get a default color which is green (don't know why) when I run the application, while I have the right color in the design. Another problem is that even if I place all the letters in order on the design and then I apply contraint, when I launch the application I get all the letters distributed in a messy way.
What do you think the problem is about?

I place all the letters in order on the design and then I apply contraint, when I launch the application I get all the letters distributed in a messy way.
That's because you have not put necessary constraint to child TextViews, but the absolute positions.
I tried to solve this issue, see below xml:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
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="match_parent">
<TextView
android:id="#+id/A"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginStart="16dp"
android:layout_marginTop="8dp"
android:text="A"
android:textSize="30sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/textView2" />
<TextView
android:id="#+id/B"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginStart="16dp"
android:layout_marginTop="8dp"
android:text="B"
android:textSize="30sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/A" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:text="SEARCH YOUR FLOWER"
android:textColor="#030303"
android:textSize="30sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/C"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginStart="16dp"
android:layout_marginTop="8dp"
android:text="C"
android:textSize="30sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/B" />
<TextView
android:id="#+id/D"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginStart="16dp"
android:layout_marginTop="8dp"
android:text="D"
android:textSize="30sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/C" />
<TextView
android:id="#+id/E"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="16dp"
android:layout_marginTop="8dp"
android:text="E"
android:textSize="30sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/D"
app:layout_constraintVertical_bias="0.0" />
As you can see, each child TextView is now constrained both sides--vertically and horizontally to the parent, that is the rootview-constraintlayout or other child view.
For example, the constraint constraintEnd_toEndOf will align the end of this view to end of another view. Same way, other constraints work and are applied.
You can also give horizontal and vertical bias to position them properly. Hope this helped a little to understand how constraint works.

for order https://stackoverflow.com/a/50855782/7616371 this is correct
and for change textColor you can use :-
android:textColor="#fff"
and for textview background color
android:background="#fff"

Android RelativeLayout working in LayoutEditor but breaking on device

For the TitleBar I have a RelativeLayout, which should display two buttons on the right side, and two TextViews on the left side. I got the layout code working in the Editor, but on the device it always breaks down.
On the image you can see a Screenshot from the Layout Editor and from the device (runs like this on multiple devices).
Here is the Layout Code I'm using:
- I know I just can dump in LinearLayouts, but this should be possible with RelativeLayout?
- I used the "toStartOf" properties because I don't want to overflow the icons with text if the text might be longer.
- Bonus Question: how can I center the two labels vertical, so that they are also centered if I only have a title and set the subtitle visibility to GONE
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.AppCompatImageButton
android:id="#+id/toolbar_right_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentEnd="true"
android:layout_alignParentTop="true"
android:layout_marginEnd="#dimen/default_content_padding"
android:background="#android:color/transparent"
tools:src="#drawable/account"/>
<android.support.v7.widget.AppCompatImageButton
android:id="#+id/toolbar_left_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentTop="true"
android:layout_marginEnd="16dp"
android:layout_toStartOf="#id/toolbar_right_button"
android:background="#android:color/transparent"
tools:src="#drawable/ic_notifications"/>
<TextView
android:id="#+id/toolbar_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignWithParentIfMissing="true"
android:layout_toStartOf="#id/toolbar_left_button"
android:fontFamily="#string/font_family_medium"
android:textAppearance="?android:textAppearanceMedium"
tools:text="Title "/>
<TextView
android:id="#+id/toolbar_subtitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignWithParentIfMissing="true"
android:layout_below="#id/toolbar_title"
android:textAppearance="?android:textAppearanceSmall"
tools:text="Subtitle"/>
</RelativeLayout>

A ConstraintLayout would solve your problem. It keeps your layout flat, and also centers your text layouts vertically (and maintains it even after you 'remove' the subtitle).
<android.support.constraint.ConstraintLayout>
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.AppCompatImageButton
android:id="#+id/toolbar_right_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="#dimen/default_content_padding"
android:background="#android:color/transparent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:src="#drawable/account" />
<android.support.v7.widget.AppCompatImageButton
android:id="#+id/toolbar_left_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="#dimen/default_content_padding"
android:background="#android:color/transparent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintRight_toLeftOf="#+id/toolbar_right_button"
app:layout_constraintTop_toTopOf="parent"
tools:src="#drawable/ic_notifications" />
<TextView
android:id="#+id/toolbar_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fontFamily="#string/font_family_medium"
android:textAppearance="?android:textAppearanceMedium"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintBottom_toTopOf="#id/toolbar_subtitle"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toLeftOf="#+id/toolbar_left_button"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_chainStyle="packed"
tools:text="Title " />
<TextView
android:id="#+id/toolbar_subtitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="8dp"
android:layout_marginStart="8dp"
android:textAppearance="?android:textAppearanceSmall"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toBottomOf="#+id/toolbar_title"
tools:text="Subtitle" />
</android.support.constraint.ConstraintLayout>

I have made it simple so it wont get messy:
<RelativeLayout 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:orientation="vertical">
<ImageButton
android:id="#+id/imageButton"
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_alignParentEnd="true"
android:layout_alignParentTop="true"
app:srcCompat="#android:drawable/ic_menu_compass" />
<ImageButton
android:id="#+id/imageButton2"
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_alignStart="#+id/imageButton"
android:layout_below="#+id/imageButton"
app:srcCompat="#android:drawable/btn_dialog" />
<TextView
android:id="#+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/imageButton2"
android:layout_alignParentStart="true"
android:text="TextView" />
<TextView
android:id="#+id/textView5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_below="#+id/textView4"
android:text="TextView" />
There are high chances that if You add a lot of elements and tools to the layout it will get messy, try to keep it simple and You will find what caused the problem.