第二个布局未在 android studio 中显示包含标签 [英] Second layout is not showing with include tag in android studio

问题描述

我设计了两个应按顺序显示的 Android 布局.因此，第一个布局必须显示在页面顶部，第二个布局必须显示在页面底部.但是，以下代码仅显示第一个布局.我怎样才能显示第二个布局?

I have designed two Android layouts which should be shown in order. So, the first layout must be showing in top of the page and the second layout must be showing in bottom of the page. However, the following code only shows the first layout. How can I show the second layout too?

主要布局是

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <include layout="@layout/first_layout"/>
    <include layout="@layout/second_layout"/>

</LinearLayout>

第一个xml布局是

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"     
    android:layout_width="match_parent"
    android:layout_height="match_parent"   
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context="net.simplifiedcoding.androidloginapp.UserProfile">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="Large Text"
        android:id="@+id/textView3"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />
</LinearLayout>

第二种布局是

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"       
    android:layout_width="match_parent"
    android:layout_height="match_parent"    
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:orientation="vertical"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"      
    tools:context=".MainActivity">
<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Name"
    android:id="@+id/textView" />

<EditText
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/editTextName" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Address"
    android:id="@+id/textView2" />

<EditText
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/editTextAddress" />

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Insert"
    android:onClick="insert"
    android:id="@+id/button" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/textViewResult" />
</LinearLayout>

推荐答案

我不确定这是否能解决您的问题，但是您可以尝试添加 android:layout_width 和 android:layout_height 在您包含的布局中以及布局权重?

I'm not yet sure if this will solve your problem, but can you try adding android:layout_width and android:layout_height in your included layout as well as layout weight?

<include layout="@layout/first_layout"
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="1"/>

<include layout="@layout/second_layout"
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="1"/>

添加信息

出现这个问题的原因是因为您的两个布局都使用 match_parent 作为高度.这意味着在第一个布局时，它将匹配父级的大小(在这种情况下是整个屏幕)，因此，第一个布局将占据整个屏幕，而第二个布局不会出现.

The reason why you have that problem is because both your layouts uses match_parent for the height. That means that at the first layout, it will match the size of the parent (which in this case is the whole screen), thus, the first layout will occupy the whole screen and the second layout won't appear.

在此解决方案中，您通过使用 layout_weight 告诉两个布局只占用屏幕的一半.

In this solution, you are telling both layouts to consume only half of the screen by using the layout_weight.

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