Android使用include标签在ConstraintLayout中添加其他布局 [英] Android add other layout in ConstraintLayout using include tag

问题描述

我使用ConstraintLayout制作了一些简单的应用进行测试.但是我有一些问题.

I make some simple app for test using ConstraintLayout. But I have some problem.

这是我的代码

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<layout 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.support.constraint.ConstraintLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.user.myapplication.activity.MainActivity">

    <Button
        android:id="@+id/btn_launch"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="8dp"
        android:layout_marginTop="16dp"
        android:text="launch"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/text_view"
        android:layout_width="100dp"
        android:layout_height="50dp"
        android:layout_marginEnd="16dp"
        android:layout_marginTop="16dp"
        android:text="Hello World!"
        app:layout_constraintHorizontal_bias="1"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/btn_launch" />

    <include
        layout="@layout/content_main"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/text_view" />

</android.support.constraint.ConstraintLayout>

content_main.xml

<?xml version="1.0" encoding="utf-8"?>
<layout 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.support.constraint.ConstraintLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:text="123456"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/textView3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginTop="8dp"
        android:text="98765"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView2" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginTop="8dp"
        android:text="abc"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView3" />

</android.support.constraint.ConstraintLayout>

代码结果

我希望" content_main "位于"Hellow世界"之下！ TextView.

I want "content_main" to be under the "Hellow world!" TextView.

我在" content_main "元素上使用了RelativeLayout，LinearLayout，ConstraintLayout.但不起作用.

I using RelativeLayout, LinearLayout, ConstraintLayout at "content_main" element. but not work.

我找到任何解决方案.但是我只是找到了如何使用ConstraintLayout.

I find any solution. But I Just find that How to use ConstraintLayout.

在ConstraintLayout中，Android"include"标签不起作用吗?

Is Android "include" tag not work at ConstraintLayout?

推荐答案

Android include 标记与ConstraintLayout兼容，但是您需要声明要包含在布局中的布局有多大以下属性.

Android include tag does work with ConstraintLayout, but you need to declare how big is the layout you want to include with the following attributes.

<include
     layout="@layout/content_main"
     android:layout_width="100dp"
     android:layout_height="250dp"
     .../>

对于具有动态高度的包含布局，请使用wrap_content作为包含标记的layout_height或layout_width属性中的值.

For included layout having dynamic height use wrap_content as a value in layout_height or layout_width attributes of include tag.

<include
    android:id="@+id/input_include"
    layout="@layout/task_input"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"/>

在那之后，您的约束应该起作用.

After that, your constraints should work.

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