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，那么最后的文本剪辑。

我希望背景的大小仅为 TextView。

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>

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

您使用的规则使视图延伸到父项的末尾。从 TextView XML 定义中删除这一行，它看起来应该没问题：

app:layout_constraintEnd_toEndOf="parent"

Answer 2

放置此属性。

<TextView
    ...
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    tools:text="This is a received "/>

Answer 3

将 TextView 放在其他布局中，并像这样将 TextView 对齐到它的开头

<?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:layout_width="match_parent"
android:layout_height="wrap_content"
tools:layout_height="match_parent">

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent">

    <TextView
        android:id="@+id/message_receive"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_margin="20dp"
        android:background="#ded"
        android:padding="20dp"
        android:textAppearance="@style/TextAppearance.AppCompat.
        Light.SearchResult.Subtitle"
        tools:text="This is a received message" />

</RelativeLayout>

</android.support.constraint.ConstraintLayout>

Answer 4

为了防止TextView在使用wrap_content时被裁剪需要设置app:layout_constrainedWidth="true"属性。当宽度设置为 wrap_content 时，这将强制执行水平约束，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_constraintHorizontal_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>

TextView背景不换行内容

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