在以前的 xml 布局中，我有多个 View 组，里面的元素很少。隐藏每个 View 组也将隐藏其所有子元素。因为我想要扁平结构并尝试了 ConstraintLayout。酷我知道如何将元素与传播链接以正确对齐。由于平面结构没有包裹 LinearLayout，所以现在我有 3 个 View 可以隐藏。我想知道是否有其他方法可以实现这一目标。

无约束布局

<RelativeLayout....
..........
..........
<LinearLayout
        android:visibility="gone"
        tools:visibility="visible"
        android:id="@+id/filter_area"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <android.support.v7.widget.AppCompatTextView
            android:id="@+id/lblTerminal"
            android:background="@color/lightGray"
            style="@style/PurpleSubtitle"
            android:drawableRight="@drawable/i_down_yellow"
            android:drawableEnd="@drawable/i_down_yellow"
            android:padding="10dp"
            android:text="@string/lblTerminal"
            android:layout_weight="5"
            android:layout_width="0dp"
            android:layout_height="wrap_content" />

        <View
            android:background="@android:color/black"
            android:layout_width="1dp"
            android:layout_height="match_parent"/>

        <android.support.v7.widget.AppCompatTextView
            android:id="@+id/lblCategory"
            android:background="@color/lightGray"
            android:padding="10dp"
            android:drawableRight="@drawable/i_down_yellow"
            android:drawableEnd="@drawable/i_down_yellow"
            style="@style/PurpleSubtitle"
            android:text="@string/lblCategory"
            android:layout_weight="5"
            android:layout_width="0dp"
            android:layout_height="wrap_content" />


    </LinearLayout>
  .......
  .......
  </RelativeLayout>

带约束布局

    <android.support.constraint.ConstraintLayout
    .....
    .....
    .....
       #happy that i no longer need LinearLayout for align properly
       <android.support.v7.widget.AppCompatTextView
            android:id="@+id/lblTerminal"
            android:background="@color/lightGray"
            style="@style/PurpleSubtitle"
            android:drawableRight="@drawable/i_down_yellow"
            android:drawableEnd="@drawable/i_down_yellow"
            android:padding="10dp"
            android:text="@string/lblTerminal"
            android:layout_weight="5"
            android:layout_width="0dp"
            android:layout_height="50dp"
            app:layout_constraintTop_toBottomOf="@+id/txt_search"
            app:layout_constraintRight_toLeftOf="@+id/view3"
            app:layout_constraintLeft_toLeftOf="@+id/guideline2"
            app:layout_constraintHorizontal_chainStyle="spread"/>

        <View
            android:background="@android:color/black"
            android:layout_width="1dp"
            android:layout_height="50dp"
            android:id="@+id/view3"
            app:layout_constraintTop_toBottomOf="@+id/txt_search"
            app:layout_constraintRight_toLeftOf="@+id/lblCategory"
            app:layout_constraintLeft_toRightOf="@+id/lblTerminal" />

        <android.support.v7.widget.AppCompatTextView
            android:id="@+id/lblCategory"
            android:background="@color/lightGray"
            android:padding="10dp"
            android:drawableRight="@drawable/i_down_yellow"
            android:drawableEnd="@drawable/i_down_yellow"
            style="@style/PurpleSubtitle"
            android:text="@string/lblCategory"
            android:layout_width="0dp"
            android:layout_height="50dp"
            app:layout_constraintTop_toTopOf="@+id/view3"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintLeft_toRightOf="@+id/view3" />



  ......
  ......
  ......

  </android.support.constraint.ConstraintLayout>

最佳答案

是的，所以现在在 ConstraintLayout 中，我们也可以使用 Group 处理特定 View 组的可见性

This is a new feature introduced in ConstraintLayout which is currently in Beta version.

如何将测试版 ConstraintLayout 添加到您的项目中？请按照以下步骤操作:

在项目 gradle 文件中添加 maven 支持，如下所示

allprojects {
    repositories {
        maven { url 'https://maven.google.com' }
        jcenter()
    }
}

然后在app gradle dependencies中添加ConstraintLayout库依赖

compile 'com.android.support.constraint:constraint-layout:1.1.0-beta3'

现在您必须在 ConstraintLayout 中添加一个 Group，如下所示

<android.support.constraint.Group
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:constraint_referenced_ids="button7,button3,button2"
        android:id="@+id/group" />  

在Group中，引用id...

app:constraint_referenced_ids="button7,button3,button2"

... 包含您要处理运行时的逗号分隔 View ID，因此，在 Activity 中，您只需如下绑定(bind) Group 并处理可见性

import android.support.constraint.Group; //import statement in activity

Group group=(Group)findViewById(R.id.group); //bind view from xml
group.setVisibility(View.VISIBLE); //this will visible all views
group.setVisibility(View.GONE); //this will set Gone to all views
group.setVisibility(View.INVISIBLE); //this will set INVISIBLE to all view

编辑:ConstraintLayout 1.1.0 稳定版于 2018 年 4 月 12 日发布 https://androidstudio.googleblog.com/2018/04/constraintlayout-110.html

implementation 'com.android.support.constraint:constraint-layout:1.1.0'

Edit for Android X: If anyone is using the Android X package, you can find package info here

https://developer.android.com/jetpack/androidx/migrate

关于android - 在约束布局中切换链组的可见性，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/44449495/