Simple yet tricky layout using ConstraintLayout

问题

I am trying to make the following seemingly simple yet tricky layout using ConstraintLayout.

Normal UI:

With longer title:

I have tried following code:

<androidx.constraintlayout.widget.ConstraintLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="16dp">

    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:ellipsize="end"
        android:maxLines="1"
        android:text="April Ludgate"
        android:textColor="#000"
        android:textSize="16sp"
        android:textStyle="bold"
        app:layout_constraintEnd_toStartOf="@+id/threadType"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintWidth_default="wrap" />


    <TextView
        android:id="@+id/threadType"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginLeft="4dp"
        android:text="SMS"
        android:textSize="12sp"
        app:layout_constraintBottom_toBottomOf="@+id/title"
        app:layout_constraintEnd_toStartOf="@+id/dummy"
        app:layout_constraintStart_toEndOf="@+id/title"
        app:layout_constraintTop_toTopOf="@+id/title"
        app:layout_constraintWidth_default="wrap" />


    <View
        android:id="@+id/dummy"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_weight="1"
        app:layout_constraintBottom_toBottomOf="@+id/title"
        app:layout_constraintEnd_toStartOf="@+id/date"
        app:layout_constraintStart_toEndOf="@+id/threadType"
        app:layout_constraintTop_toTopOf="@+id/title"
        app:layout_constraintWidth_default="spread" />

    <TextView
        android:id="@+id/date"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="4:18 PM"
        android:textSize="12sp"
        app:layout_constraintBottom_toBottomOf="@+id/title"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@+id/dummy"
        app:layout_constraintTop_toTopOf="@+id/title"
        app:layout_constraintWidth_default="wrap" />

</androidx.constraintlayout.widget.ConstraintLayout>

Which give me this:

But quickly fall apart with a longer name:

Is there a way to achieve this via ConstraintLayout just in xml? I am willing to switch to another layout if it accomplished what I want.

回答1:

Use constraintHorizontal_chainStyle to packed in title with constraintHorizontal_bias to 0.0 like below:

<androidx.constraintlayout.widget.ConstraintLayout android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="16dp"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <TextView
        android:id="@+id/title"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:ellipsize="end"
        android:maxLines="1"
        android:text="April Ludgate April Ludgate April Ludgate April Ludgate"
        android:textColor="#000"
        android:textSize="16sp"
        android:textStyle="bold"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintHorizontal_chainStyle="packed"
        app:layout_constraintEnd_toStartOf="@+id/threadType"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintWidth_default="wrap" />

    <TextView
        android:id="@+id/threadType"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginLeft="4dp"
        android:layout_marginRight="4dp"
        android:text="SMS"
        android:textSize="12sp"
        app:layout_constraintBottom_toBottomOf="@+id/title"
        app:layout_constraintEnd_toStartOf="@+id/date"
        app:layout_constraintStart_toEndOf="@+id/title"
        app:layout_constraintTop_toTopOf="@+id/title"
        app:layout_constraintWidth_default="wrap" />

    <TextView
        android:id="@+id/date"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="4:18 PM"
        android:textSize="12sp"
        app:layout_constraintBottom_toBottomOf="@+id/title"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="@+id/title"
        app:layout_constraintWidth_default="wrap" />

</androidx.constraintlayout.widget.ConstraintLayout>

Output:

• Short Text

• Long Text

来源：https://stackoverflow.com/questions/60163233/simple-yet-tricky-layout-using-constraintlayout