androidxmlandroid-fragmentsandroid-scrollviewandroid-constraintlayout
ScrollView doesn't fit width of parent
I'm trying to fill my parent Activity with a new Fragment. It appears fine in designer mode, but crushes down to an arbitrary width when run. Setting fillViewport=true doesn't seem to make a difference.
SrollView in Designer
SrollView in Emulator
The other tabs contain grids of RecyclerViewFragments. They had the same issue until I defined a fixed width for the columns in the XML, and also programmatically set the number of columns to the total width of the screen divided by the fixed column width (noOfColumns=dpWidth/columnWidth+1).
Activity
<?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:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/gray"
tools:context="com.jamesjmtaylor.weg2015.TabBarActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="bottom"
android:orientation="vertical">
<android.support.design.widget.BottomNavigationView
android:id="@+id/navigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/gray"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:menu="@menu/navigation"/>
</LinearLayout>
<FrameLayout
android:id="@+id/fragmentFrameLayout"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_marginBottom="@dimen/bottomNavigationViewHeight"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
</FrameLayout>
<FrameLayout
android:id="@+id/hudFrameLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
</FrameLayout>
</android.support.constraint.ConstraintLayout>
ScrollView
<ScrollView
android:id="@+id/cardsSetupFragment"
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:fillViewport="true"
tools:context=".cardsTab.CardsFragment">
<android.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:context=".cardsTab.CardsActivity">
<TextView
android:id="@+id/textView2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:text="@string/equipment_flash_cards"
android:textAlignment="center"
android:textColor="@color/black"
android:textSize="20sp"
android:textStyle="bold"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"/>
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="16dp"
android:text="@string/choose_set_difficulty"
android:textStyle="bold"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView2"/>
<TextView
android:id="@+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:text="@string/choose_set_type"
android:textStyle="bold"
app:layout_constraintStart_toStartOf="@+id/textView5"
app:layout_constraintTop_toBottomOf="@+id/qtyTextView"/>
<TextView
android:id="@+id/textView5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:text="@string/choose_set_quantity"
android:textStyle="bold"
app:layout_constraintStart_toStartOf="@+id/radioGroup"
app:layout_constraintTop_toBottomOf="@+id/radioGroup"/>
<RadioGroup
android:id="@+id/radioGroup"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:checkedButton="@+id/easyRadioButton"
android:orientation="horizontal"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView3">
<RadioButton
android:id="@+id/easyRadioButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingEnd="16dp"
android:paddingStart="8dp"
android:text="@string/easy"/>
<RadioButton
android:id="@+id/mediumRadioButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingEnd="16dp"
android:paddingStart="8dp"
android:text="@string/medium"/>
<RadioButton
android:id="@+id/hardRadioButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingEnd="16dp"
android:paddingStart="8dp"
android:text="@string/hard"/>
</RadioGroup>
<SeekBar
android:id="@+id/qtySeekBar"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:max="100"
android:progress="10"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="@+id/qtyTextView"
app:layout_constraintTop_toTopOf="@+id/qtyTextView"/>
<TextView
android:id="@+id/qtyTextView"
android:layout_width="64dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:text="@string/placeholder_card_qty"
app:layout_constraintStart_toStartOf="@+id/textView5"
app:layout_constraintTop_toBottomOf="@+id/textView5"/>
<ToggleButton
android:id="@+id/airToggleButton"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:textOff="@string/title_air"
android:textOn="@string/title_air"
app:layout_constraintEnd_toEndOf="@+id/landToggleButton"
app:layout_constraintStart_toEndOf="@+id/seaToggleButton"
app:layout_constraintTop_toTopOf="@+id/seaToggleButton"/>
<ToggleButton
android:id="@+id/seaToggleButton"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:textOff="@string/title_sea"
android:textOn="@string/title_sea"
app:layout_constraintEnd_toStartOf="@+id/airToggleButton"
app:layout_constraintStart_toStartOf="@+id/gunsToggleButton"
app:layout_constraintTop_toBottomOf="@+id/gunsToggleButton"/>
<ToggleButton
android:id="@+id/landToggleButton"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:textOff="@string/title_land"
android:textOn="@string/title_land"
app:layout_constraintEnd_toEndOf="@+id/qtySeekBar"
app:layout_constraintStart_toEndOf="@+id/gunsToggleButton"
app:layout_constraintTop_toTopOf="@+id/gunsToggleButton"/>
<ToggleButton
android:id="@+id/gunsToggleButton"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:checked="true"
android:textOff="@string/weapons"
android:textOn="@string/weapons"
app:layout_constraintEnd_toStartOf="@+id/landToggleButton"
app:layout_constraintHorizontal_chainStyle="spread_inside"
app:layout_constraintStart_toStartOf="@+id/textView4"
app:layout_constraintTop_toBottomOf="@+id/textView4"
/>
<Button
android:id="@+id/startButton"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="24dp"
android:background="@color/black"
android:text="@string/start"
android:textColor="@android:color/white"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/seaToggleButton"
app:layout_constraintVertical_bias="1.0"/>
</android.support.constraint.ConstraintLayout>
</ScrollView>
Solution
When You give all 4 constrains to a view then make its width and height 0dp
<?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:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/gray"
tools:context="com.jamesjmtaylor.weg2015.TabBarActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="bottom"
android:orientation="vertical">
<android.support.design.widget.BottomNavigationView
android:id="@+id/navigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/gray"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:menu="@menu/navigation"/>
</LinearLayout>
<FrameLayout
android:id="@+id/fragmentFrameLayout"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginBottom="@dimen/bottomNavigationViewHeight"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
</FrameLayout>
<FrameLayout
android:id="@+id/hudFrameLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
</FrameLayout>
change this https://gist.github.com/jamesjmtaylor/ef5ea59197cb52d1ecb46fa101b7af51 with above code I have changed width of FrameLayout to 0dp from match_parent