Ellipsize TextView with 0dp in ConstraintLayout

ellipsized_text.xml

<TextView
    android:id="@+id/textView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="16dp"
    android:layout_marginEnd="16dp"
    android:ellipsize="end"
    android:maxLines="4"
    app:layout_constrainedWidth="true"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<!-- layout_constrainedWidth="true" is key -->

@andor201995 I think this is the view I was working with most recently:

<TextView
    android:id="@+id/searchResultsExplainer"
    style="?attr/textAppearanceBody1"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_marginHorizontal="16dp"
    android:ellipsize="end"
    android:maxLines="4"
    app:layout_constraintBottom_toTopOf="@id/topBarrier"
    app:layout_constraintEnd_toStartOf="@id/viewTypeToggle"
    app:layout_constraintStart_toEndOf="@id/openFilters"
    app:layout_constraintTop_toBottomOf="@id/searchInputLayout"
    app:layout_constraintVertical_bias="0.5"
    tools:text="Search results: &quot;Dining Room&quot;"
    tools:visibility="visible" />

Idk if that helps you at all.

Another thing you can try doing is ellipsizing the text manually. Something like:

val text = "Whatever really long string you are setting"

someTextView.addOnLayoutChangeListener { _, _, _, _, _, _, _, _, _ ->
    someTextView.text = TextUtils.ellipsize(
        text,
        someTextView.paint,
        someTextView.width.toFloat(),
        TextUtils.TruncateAt.MIDDLE // Or END, etc
    )
}

You need to do the change in an OnLayoutChangeListener because your view might not be laid out yet when you are calling this code to set the text. The TextUtils.ellipsize method needs to know the width of the view the text is going into in order to ellipsize it properly.

Your solution was really helpful in guiding my usecase and used below code

private fun setSubTitle(text: String?) {
        // set the layout with expected max width for text
        contentText.isSingleLine = true
        contentText.text = text
        // reset the text with ellipsized text
        contentText.doOnNextLayout {
            if (it is TextView) {
                it.text = TextUtils.ellipsize(
                    text,
                    it.paint,
                    it.width.toFloat(),
                    TextUtils.TruncateAt.END
                )
            }
        }
    }

Thanks a lot.