自定义分离器引起例外

Question

我有自定义的视图分离器，由于某种原因，其背景颜色选择器正在引起异常。如果我更改背景颜色以静态价值的功能完美。

这个问题的原因是什么？

 <include
   layout="@layout/field_underline"
   android:id="@+id/input_underline"
   android:layout_width="wrap_content"
   android:layout_height="1dp"
   android:layout_below="@+id/main_field"/>

field_underline.xml

<View xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="1dp"
    android:background="@color/field_underline_color" />

field_underline_color.xml

<?xml version="1.0" encoding="utf-8"?>
<selector
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:exitFadeDuration="200"
    android:enterFadeDuration="200">
    <item
        android:state_enabled="false"
        android:state_checked="false"
        android:state_activated="false"
        android:alpha="0.4"
        android:color="@color/content_50"
        />
    <item
        android:state_enabled="true"
        android:state_checked="true"
        android:state_activated="false"
        android:alpha="1"
        android:color="@color/invalid"
        />
    <item
        android:state_enabled="true"
        android:state_checked="false"
        android:state_activated="true"
        android:alpha="1"
        android:color="@color/primary"
        />
    <item
        android:alpha="1"
        android:color="@color/content_50"/>
</selector>

异常：

android.view.InflateException: Binary XML file line #71: Binary XML file line #4: Error inflating class <unknown>
    Caused by: android.view.InflateException: Binary XML file line #4: Error inflating class <unknown>
    Caused by: java.lang.reflect.InvocationTargetException
        at java.lang.reflect.Constructor.newInstance0(Native Method)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:343)
        at android.view.LayoutInflater.createView(LayoutInflater.java:647)
        at com.android.internal.policy.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:58)
        at android.view.LayoutInflater.onCreateView(LayoutInflater.java:720)
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:788)
        at android.view.LayoutInflater.parseInclude(LayoutInflater.java:965)
        at android.view.LayoutInflater.rInflate(LayoutInflater.java:859)
        at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
        at androidx.databinding.DataBindingUtil.inflate(DataBindingUtil.java:126)
        at androidx.databinding.DataBindingUtil.inflate(DataBindingUtil.java:95)

Answer 1

分离器需要这些行动吗？似乎并非如此。

Answer 2

您需要在logcat中向下看较低，才能找到真正的错误。我相信，如果您向下滚动，您会看到类似于以下错误的内容：

e/androidruntime：由：org.xmlpull.v1.xmlpullparserexception：binary xml文件行＃6：标签需要“可绘制的”属性或儿童标签，以定义可绘制的

如果您查看 statelistdrawable>

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android"
    android:constantSize=["true" | "false"]
    android:dither=["true" | "false"]
    android:variablePadding=["true" | "false"] >
    <item
        android:drawable="@[package:]drawable/drawable_resource"
        android:state_pressed=["true" | "false"]
        android:state_focused=["true" | "false"]
        android:state_hovered=["true" | "false"]
        android:state_selected=["true" | "false"]
        android:state_checkable=["true" | "false"]
        android:state_checked=["true" | "false"]
        android:state_enabled=["true" | "false"]
        android:state_activated=["true" | "false"]
        android:state_window_focused=["true" | "false"] />
</selector>

则标签需要一个“可绘制”属性或儿童标记，以定义可绘制的drawable。 href =“ https://developer.android.com/guide/topics/resources/drawable-resource#statelist ”

Android：可绘制

＆nbsp;＆nbsp;＆nbsp; nbsp; drable Resource。 必需。引用可绘制的资源。

您缺少可绘制的属性。