How to get constraints working in Java Android Studio

Tomgxz — Wed, 14 Sep 2022 06:55:39 +0000

I am trying to programmatically define objects in one of the activities, so I'm using the ConstraintSet class it Java to do it. However, when I run the application, all of the widgets that I gave constraints to with java go to 0,0 as if they don't have constraints. I've tried looking online but havent found any fixes.

activity.java
`

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity);

    addCharacterGroupToSelection("Outsider",ConstraintSet.PARENT_ID);
    addCharacterGroupToSelection("Minion",R.id.activity_team_outsider);
}

protected void addCharacterGroupToSelection(String team, int previousGroupId) {
    int teamColor; int teamTitleId; int teamGroupId;

    switch (team) {
        case "Outsider":
            teamColor = getResources().getColor(R.color.good);
            break;
        case "Minion":
            teamColor = getResources().getColor(R.color.evil);
            break;
        default:
            throw new IllegalStateException("Unexpected value: " + team);
    }

    switch (team) {
        case "Outsider":
            teamGroupId = R.id.activity_team_outsider;
            teamTitleId = R.id.activity_team_outsider_title;
            break;
        case "Minion":
            teamGroupId = R.id.activity_team_minion;
            teamTitleId = R.id.activity_team_minion_title;
            break;
        default:
            throw new IllegalStateException("Unexpected value: " + team);
    }

    ConstraintLayout characterSelectContent = findViewById(R.id.activity_characterselect_content);
    ConstraintLayout teamGroup = new ConstraintLayout(this);
    TextView teamTitle = new TextView(this);

    teamGroup.setId(teamGroupId);

    characterSelectContent.addView(teamGroup);

    teamTitle.setId(teamTitleId);
    teamTitle.setText(team);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { teamTitle.setTextAppearance(R.style.body_black); }
    teamTitle.setTextColor(teamColor);

    teamGroup.addView(teamTitle);

    ConstraintSet constraintSet = new ConstraintSet();
    constraintSet.clone(characterSelectContent);

    constraintSet.constrainWidth(teamGroup.getId(),ConstraintLayout.LayoutParams.MATCH_PARENT);
    constraintSet.constrainHeight(teamGroup.getId(),ConstraintLayout.LayoutParams.WRAP_CONTENT);

    constraintSet.connect(teamGroup.getId(),ConstraintSet.END,ConstraintSet.PARENT_ID,ConstraintSet.END,0);
    constraintSet.connect(teamGroup.getId(),ConstraintSet.START,ConstraintSet.PARENT_ID,ConstraintSet.START,0);
    constraintSet.connect(teamGroup.getId(),ConstraintSet.TOP,previousGroupId,ConstraintSet.TOP,0);

    constraintSet.applyTo(characterSelectContent);

}

activity.xml
<?xml version="1.0" encoding="utf-8"?>
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=".activity">

<LinearLayout
    android:id="@+id/header"
    android:layout_width="0dp"
    android:layout_height="@dimen/header_height"
    android:layout_marginStart="@dimen/left_margin"
    android:layout_marginEnd="@dimen/right_margin"
    android:clipToPadding="false"
    android:orientation="horizontal"
    android:padding="-32dp"
    android:paddingLeft="-32dp"
    android:paddingRight="-32dp"
    android:paddingBottom="-32dp"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.0"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent">

    <ImageView
        android:id="@+id/header_editionlogo"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_marginStart="@dimen/left_margin"
        android:layout_marginTop="@dimen/top_margin"
        android:layout_marginBottom="@dimen/bottom_margin"
        android:layout_weight="1"
        android:contentDescription="@string/trouble_brewing"
        app:srcCompat="@drawable/tb_logo" />

    <TextView
        android:id="@+id/activity_text_select_characters"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_marginTop="@dimen/top_margin"
        android:layout_marginEnd="@dimen/right_margin"
        android:layout_marginBottom="@dimen/bottom_margin"
        android:layout_weight="3"
        android:text="@string/select_characters"
        android:textAlignment="center"
        android:textAppearance="@style/body_black"
        android:textColor="@color/black"
        android:textSize="34sp" />

</LinearLayout>

<ScrollView
    android:id="@+id/activity_characterselect"
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:layout_marginStart="@dimen/left_margin"
    android:layout_marginTop="1dp"
    android:layout_marginEnd="@dimen/right_margin"
    android:layout_marginBottom="@dimen/bottom_margin"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/header">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/activity_characterselect_content"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

    </androidx.constraintlayout.widget.ConstraintLayout>
</ScrollView>


</androidx.constraintlayout.widget.ConstraintLayout>

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How to get constraints working in Java Android Studio