java - 有什么方法可以在距离约束布局处设置障碍或在没有约束的情况下向 View 添加边距？

Question

要在约束布局中为一组 View 设置背景，想法是创建一个 View 项并将其约束到极端 View 的边界。但是，如果一组只依赖于右侧约束，则无法向左侧添加边距，因此可能设置背景的 View 组没有左侧填充，

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <data>
        <import type="android.view.View"/>
        <variable
            name="audio"
            type="example.model.observables.AttachmentObservableModel"/>
    </data>

    <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:layout_marginBottom="10dp"
        android:background="@drawable/selector_chat_row"
        >

        <include
            android:id="@+id/message_preview_layout"
            layout="@layout/reply_preview_layout"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:minWidth="160dp"
            android:layout_marginLeft="10dp"
            app:layout_constraintRight_toLeftOf="@+id/guideline"

            app:layout_constraintTop_toTopOf="parent" />

        <android.support.constraint.Barrier
            android:id="@+id/left_barrier"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:barrierDirection="left"
            app:constraint_referenced_ids="play_pause,message_preview_layout" />

        <View
            android:id="@+id/view"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:background="@drawable/chat_me_background"
            app:layout_constraintBottom_toBottomOf="@+id/play_pause"
            app:layout_constraintLeft_toLeftOf="@+id/left_barrier"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

        <ImageButton
            android:id="@+id/play_pause"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:layout_marginTop="10dp"
            android:layout_marginRight="10dp"
            android:layout_marginBottom="10dp"
            android:background="@null"
            android:enabled="@{!(audio.filePath == null || audio.filePath.isEmpty())}"
            android:onClick="@{() -> audio.playing? audio.onPausePressed(): audio.onPlayPressed()}"
            android:paddingLeft="10dp"
            android:paddingBottom="10dp"
            android:src="@{audio.playing? @drawable/ic_pause_circle_filled: @drawable/ic_play_arrow}"
            app:layout_constraintRight_toLeftOf="@+id/seekbar"
            app:layout_constraintTop_toBottomOf="@+id/message_preview_layout" />

        <android.support.v7.widget.AppCompatSeekBar
            android:id="@+id/seekbar"
            android:layout_width="170dp"
            android:layout_height="wrap_content"
            android:layout_marginRight="10dp"
            android:enabled="@{!(audio.filePath == null || audio.filePath.isEmpty() || !audio.playing)}"
            android:max="@{audio.max}"
            android:onProgressChanged="@{audio::onProgressChanged}"
            android:paddingStart="10dp"
            android:paddingRight="10dp"
            android:paddingBottom="10dp"
            android:progress="@{audio.progress}"
            android:progressTint="@color/selected"
            android:secondaryProgressTint="@color/colorAccent"
            android:thumbTint="@color/colorWhite"
            app:layout_constraintBottom_toBottomOf="@+id/play_pause"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="@+id/play_pause" />

        <ProgressBar

            android:id="@+id/progress"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:indeterminateTint="@color/color_offline"
            android:visibility="@{(audio.filePath == null ||audio.filePath.isEmpty())? View.VISIBLE:View.GONE}"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintLeft_toLeftOf="@+id/play_pause"
            app:layout_constraintRight_toRightOf="@+id/seekbar"
            app:layout_constraintTop_toTopOf="parent"
            style="?android:attr/progressBarStyleSmall"/>

        <android.support.constraint.Guideline
            android:id="@+id/guideline"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            app:layout_constraintGuide_end="15dp"
            />

    </android.support.constraint.ConstraintLayout>
</layout>

这里我想在左侧添加一些填充，其中“view”是所有 View 的背景，但顶部 Constraint 布局具有不同的背景。目前它看起来像这样

Answer 1

找到解决方案。

在屏障左侧添加一个空 View ，宽度为所需的填充。

<View
            android:id="@+id/left_view"
            android:layout_width="15dp"
            android:layout_height="1dp"
            app:layout_constraintRight_toLeftOf="@+id/left_barrier"/>

现在将背景 View 的左侧设置为该 View 的左侧。即改变

<View
            android:id="@+id/view"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:background="@drawable/chat_me_background"
            app:layout_constraintBottom_toBottomOf="@+id/play_pause"
            app:layout_constraintLeft_toLeftOf="@+id/left_barrier"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

到

<View
            android:id="@+id/view"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:background="@drawable/chat_me_background"
            app:layout_constraintBottom_toBottomOf="@+id/play_pause"
            app:layout_constraintLeft_toLeftOf="@+id/left_view"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent" />