android - TextView背景不换行内容

Question

我在 ConstraintLayout 中有一个带有可绘制背景的 TextView。它的宽度设置为 0dp (match_constraint)。如果我将它设置为 wrap_content，文本将在末尾剪辑。

我希望背景只有 TextView 的大小。

XML:

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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="wrap_content"
    tools:layout_height="match_parent">

    <TextView
        android:id="@+id/message_receive"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="16dp"
        android:background="@drawable/rounded_chat_message"
        android:padding="8dp"
        android:textAppearance="@style/TextAppearance.AppCompat.Light.SearchResult.Subtitle"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        tools:text="This is a received message"/>

</androidx.constraintlayout.widget.ConstraintLayout>

将其设置为wrap_content后:

编辑:

rounded_chat_message.xml:

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <shape android:shape="rectangle">

            <gradient android:angle="0"
                android:startColor="@android:color/darker_gray"
                android:endColor="@android:color/darker_gray" />
            <corners android:radius="16dp" />
            <padding
                android:bottom="2dp"
                android:left="2dp"
                android:right="2dp"
                android:top="2dp" />
        </shape>
    </item>
    <item>
        <shape android:shape="rectangle">
            <solid android:color="@android:color/white" />
            <corners android:radius="16dp" />
        </shape>
    </item>
</layer-list>

Answer 1

要防止 TextView 在使用 wrap_content 时发生裁剪，需要设置 app:layout_constrainedWidth="true" 属性。这将在宽度设置为 wrap_content 时强制执行水平约束，因此必须设置 start 和 end (它们在您的情况下).现在要使 TextView 保持在开头，您需要设置 app:layout_constraintHorizo​​ntal_bias="0"(或 1 对齐到结尾) .

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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="wrap_content"
    tools:layout_height="match_parent">

    <TextView
        android:id="@+id/message_receive"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="16dp"
        android:background="@drawable/rounded_chat_message"
        android:padding="8dp"
        android:textAppearance="@style/TextAppearance.AppCompat.Light.SearchResult.Subtitle"
        app:layout_constrainedWidth="true"
        app:layout_constraintHorizontal_bias="0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        tools:text="Message"/>

</androidx.constraintlayout.widget.ConstraintLayout>