Question

要在约束布局中为一组视图设置背景，我们的想法是创建一个View项并将其约束到极端视图的边界。但是，如果一个组仅依赖于右侧约束，则无法向左侧添加边距，因此可能设置背景的视图组不会产生左边距，

<?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>

这里我想在左侧填充一些填充，其中“view”是所有视图的背景，但顶部Constraint布局具有不同的背景。目前它看起来像这样

Answer 1

找到了解决方案。

在屏障左侧添加一个空视图，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"/>

现在将背景视图左侧设置为此视图的左侧。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" />

是否可以在距离约束布局中设置障碍或在没有约束的情况下为视图添加边距？

1 个答案: