Nsryjdtyk

I'm trying to add a toolbar inside a constraint layout but this is the result I'm getting:

As you can see it doesn't fit the whole screen.
Here's my xml:

<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=".MainActivity">



    <android.support.v7.widget.Toolbar

        android:id="@+id/toolbar"

        android:layout_width="match_parent"

        android:layout_height="?attr/actionBarSize"

        android:background="?attr/colorPrimary"

        android:theme="@style/ThemeOverlay.AppCompat.ActionBar"

        app:popupTheme="@style/ThemeOverlay.AppCompat.Light">



        <TextView

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="Fragment title"/>



    </android.support.v7.widget.Toolbar>

</android.support.constraint.ConstraintLayout>

The ConstraintLayout width and length are set to match parent (which should be the screen?) and the toolbar width is set to match the layout width.
What am I missing?

try this you have to set the constraintTop to the parent and also make width value match constraints and set start and end constraint to parent,

check the code below

<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=".MainActivity">



    <android.support.v7.widget.Toolbar

        android:id="@+id/toolbar"

        android:layout_width="0dp"

        android:layout_height="?attr/actionBarSize"

        android:background="?attr/colorPrimary"

        android:theme="@style/ThemeOverlay.AppCompat.ActionBar"

        app:layout_constraintEnd_toEndOf="parent"

        app:layout_constraintStart_toStartOf="parent"

        app:layout_constraintTop_toTopOf="parent"

        app:popupTheme="@style/ThemeOverlay.AppCompat.Light">



        <TextView

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="Fragment title" />



    </android.support.v7.widget.Toolbar>

</android.support.constraint.ConstraintLayout>

Try this out by adding these content inside toolbar

android:contentInsetLeft="0dp"

    android:contentInsetStart="0dp"

    app:contentInsetLeft="0dp"

    app:contentInsetStart="0dp"

    android:contentInsetRight="0dp"

    android:contentInsetEnd="0dp"

    app:contentInsetRight="0dp"

    app:contentInsetEnd="0dp" 

I got this from Android: remove left margin from actionbar's custom layout. And u can try other solutions in there as well if this is not solve your problem.

I solved this issue by putting the action bar on the main activity instead of the fragment layout.