没有找到类“android.view.View？答案

【问题标题】：Didn't find class "android.view.View?没有找到类“android.view.View？
【发布时间】：2020-03-08 11:44:48
【问题描述】：

我正在尝试使用充气机访问不同的 xml 文件。

LayoutInflater inflater = (LayoutInflater)getBaseContext()
                        .getSystemService(LAYOUT_INFLATER_SERVICE);

View vi = inflater.inflate(R.layout.imagelist_item, null);

TextView title = (TextView)vi.findViewById(R.id.description);
title.setText("My Awesome Text");

但我得到了错误 “在路径：DexPathList 上找不到类“android.view.View$OnUnhandledKeyEventListener”和“拒绝在先前失败的类 java.lang.Class 上重新初始化”

我不确定是什么导致了问题？

这是我的日志：


03/08 20:36:43: Launching 'app' on Nexus 5X API 26.
Waiting for process to come online...
Connected to process 4892 on device 'emulator-5554'.
Capturing and displaying logcat messages from application. This behavior can be disabled in the "Logcat output" section of the "Debugger" settings page.
I/zygote: Rejecting re-init on previously-failed class java.lang.Class<androidx.core.view.ViewCompat$2>: java.lang.NoClassDefFoundError: Failed resolution of: Landroid/view/View$OnUnhandledKeyEventListener;
        at void androidx.core.view.ViewCompat.setBackground(android.view.View, android.graphics.drawable.Drawable) (ViewCompat.java:2559)
        at void androidx.appcompat.widget.ActionBarContainer.<init>(android.content.Context, android.util.AttributeSet) (ActionBarContainer.java:62)
        at java.lang.Object java.lang.reflect.Constructor.newInstance0(java.lang.Object[]) (Constructor.java:-2)
        at java.lang.Object java.lang.reflect.Constructor.newInstance(java.lang.Object[]) (Constructor.java:334)
        at android.view.View android.view.LayoutInflater.createView(java.lang.String, java.lang.String, android.util.AttributeSet) (LayoutInflater.java:647)
        at android.view.View android.view.LayoutInflater.createViewFromTag(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet, boolean) (LayoutInflater.java:790)
I/zygote:     at android.view.View android.view.LayoutInflater.createViewFromTag(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet) (LayoutInflater.java:730)
        at void android.view.LayoutInflater.rInflate(org.xmlpull.v1.XmlPullParser, android.view.View, android.content.Context, android.util.AttributeSet, boolean) (LayoutInflater.java:863)
        at void android.view.LayoutInflater.rInflateChildren(org.xmlpull.v1.XmlPullParser, android.view.View, android.util.AttributeSet, boolean) (LayoutInflater.java:824)
        at android.view.View android.view.LayoutInflater.inflate(org.xmlpull.v1.XmlPullParser, android.view.ViewGroup, boolean) (LayoutInflater.java:515)
        at android.view.View android.view.LayoutInflater.inflate(int, android.view.ViewGroup, boolean) (LayoutInflater.java:423)
I/zygote:     at android.view.View android.view.LayoutInflater.inflate(int, android.view.ViewGroup) (LayoutInflater.java:374)
        at android.view.ViewGroup androidx.appcompat.app.AppCompatDelegateImpl.createSubDecor() (AppCompatDelegateImpl.java:607)
        at void androidx.appcompat.app.AppCompatDelegateImpl.ensureSubDecor() (AppCompatDelegateImpl.java:518)
        at void androidx.appcompat.app.AppCompatDelegateImpl.setContentView(int) (AppCompatDelegateImpl.java:466)
        at void androidx.appcompat.app.AppCompatActivity.setContentView(int) (AppCompatActivity.java:140)
        at void edu.cuhk.csci3310.cusweetnames.MainActivity.onCreate(android.os.Bundle) (MainActivity.java:36)
        at void android.app.Activity.performCreate(android.os.Bundle) (Activity.java:6975)
        at void android.app.Instrumentation.callActivityOnCreate(android.app.Activity, android.os.Bundle) (Instrumentation.java:1213)
        at android.app.Activity android.app.ActivityThread.performLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent) (ActivityThread.java:2770)
        at void android.app.ActivityThread.handleLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:2892)
        at void android.app.ActivityThread.-wrap11(android.app.ActivityThread, android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:-1)
        at void android.app.ActivityThread$H.handleMessage(android.os.Message) (ActivityThread.java:1593)
I/zygote:     at void android.os.Handler.dispatchMessage(android.os.Message) (Handler.java:105)
        at void android.os.Looper.loop() (Looper.java:164)
        at void android.app.ActivityThread.main(java.lang.String[]) (ActivityThread.java:6541)
        at java.lang.Object java.lang.reflect.Method.invoke(java.lang.Object, java.lang.Object[]) (Method.java:-2)
        at void com.android.internal.os.Zygote$MethodAndArgsCaller.run() (Zygote.java:240)
        at void com.android.internal.os.ZygoteInit.main(java.lang.String[]) (ZygoteInit.java:767)
    Caused by: java.lang.ClassNotFoundException: Didn't find class "android.view.View$OnUnhandledKeyEventListener" on path: DexPathList[[zip file "/data/app/edu.cuhk.csci3310.cusweetnames-mm4Y3gQqoVOgcskW219QlQ==/base.apk"],nativeLibraryDirectories=[/data/app/edu.cuhk.csci3310.cusweetnames-mm4Y3gQqoVOgcskW219QlQ==/lib/x86, /system/lib, /vendor/lib]]
        at java.lang.Class dalvik.system.BaseDexClassLoader.findClass(java.lang.String) (BaseDexClassLoader.java:93)
        at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String, boolean) (ClassLoader.java:379)
        at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String) (ClassLoader.java:312)
        at void androidx.core.view.ViewCompat.setBackground(android.view.View, android.graphics.drawable.Drawable) (ViewCompat.java:2559)
        at void androidx.appcompat.widget.ActionBarContainer.<init>(android.content.Context, android.util.AttributeSet) (ActionBarContainer.java:62)
        at java.lang.Object java.lang.reflect.Constructor.newInstance0(java.lang.Object[]) (Constructor.java:-2)
        at java.lang.Object java.lang.reflect.Constructor.newInstance(java.lang.Object[]) (Constructor.java:334)
        at android.view.View android.view.LayoutInflater.createView(java.lang.String, java.lang.String, android.util.AttributeSet) (LayoutInflater.java:647)
        at android.view.View android.view.LayoutInflater.createViewFromTag(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet, boolean) (LayoutInflater.java:790)
I/zygote:     at android.view.View android.view.LayoutInflater.createViewFromTag(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet) (LayoutInflater.java:730)
        at void android.view.LayoutInflater.rInflate(org.xmlpull.v1.XmlPullParser, android.view.View, android.content.Context, android.util.AttributeSet, boolean) (LayoutInflater.java:863)
        at void android.view.LayoutInflater.rInflateChildren(org.xmlpull.v1.XmlPullParser, android.view.View, android.util.AttributeSet, boolean) (LayoutInflater.java:824)
        at android.view.View android.view.LayoutInflater.inflate(org.xmlpull.v1.XmlPullParser, android.view.ViewGroup, boolean) (LayoutInflater.java:515)
        at android.view.View android.view.LayoutInflater.inflate(int, android.view.ViewGroup, boolean) (LayoutInflater.java:423)
        at android.view.View android.view.LayoutInflater.inflate(int, android.view.ViewGroup) (LayoutInflater.java:374)
        at android.view.ViewGroup androidx.appcompat.app.AppCompatDelegateImpl.createSubDecor() (AppCompatDelegateImpl.java:607)
        at void androidx.appcompat.app.AppCompatDelegateImpl.ensureSubDecor() (AppCompatDelegateImpl.java:518)
I/zygote:     at void androidx.appcompat.app.AppCompatDelegateImpl.setContentView(int) (AppCompatDelegateImpl.java:466)
        at void androidx.appcompat.app.AppCompatActivity.setContentView(int) (AppCompatActivity.java:140)
        at void edu.cuhk.csci3310.cusweetnames.MainActivity.onCreate(android.os.Bundle) (MainActivity.java:36)
        at void android.app.Activity.performCreate(android.os.Bundle) (Activity.java:6975)
        at void android.app.Instrumentation.callActivityOnCreate(android.app.Activity, android.os.Bundle) (Instrumentation.java:1213)

activity_main：

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:layout_width="wrap_content"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerview"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />


</androidx.constraintlayout.widget.ConstraintLayout>

imagelist_item.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="6dp">


    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:id="@+id/rl">

        <ImageView
            android:id ="@+id/image"
            android:src="@drawable/p0_frozen_yogurt_milano_fresh_cafe"
            style="@style/image_title" />

        <TextView
            android:id="@+id/description"
            android:textSize="17sp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignLeft="@+id/image"
            android:layout_toRightOf="@+id/image"

            android:layout_alignTop="@+id/image"
            android:layout_marginStart="170dp"
            android:layout_marginLeft="197dp"
            android:layout_marginTop="10dp"
            android:layout_marginEnd="10dp"
            android:layout_marginRight="-177dp"
            android:layout_marginBottom="10dp"
            android:text="@string/dessert_name"
            android:gravity="top"
            android:textColor="#000000" />

        <TextView
            android:id="@+id/location"
            android:textSize="15sp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignLeft="@+id/image"
            android:layout_toRightOf="@+id/image"

            android:layout_alignTop="@+id/image"
            android:layout_alignBottom="@+id/image"
            android:layout_marginStart="170dp"
            android:layout_marginLeft="197dp"
            android:layout_marginTop="10dp"
            android:layout_marginEnd="10dp"
            android:layout_marginRight="-177dp"
            android:layout_marginBottom="10dp"
            android:gravity="center_vertical"
            android:text="@string/location"
            android:textColor="#000000" />
        <TextView
            android:id="@+id/rating"
            android:textSize="15sp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignLeft="@+id/image"
            android:layout_toRightOf="@+id/image"
            android:layout_alignBottom="@+id/image"
            android:layout_marginStart="170dp"
            android:layout_marginLeft="197dp"
            android:layout_marginTop="10dp"
            android:layout_marginEnd="10dp"
            android:layout_marginRight="-177dp"
            android:layout_marginBottom="10dp"
            android:gravity="bottom"
            android:text="@string/rating"
            android:textColor="#000000"
            android:drawableLeft="@drawable/star"
            android:drawablePadding="7dp"
            />
    </RelativeLayout>
</LinearLayout>

gradle（应用程序）：

apply plugin: 'com.android.application'

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.2"
    defaultConfig {
        applicationId "edu.cuhk.csci3310.cusweetnames"
        minSdkVersion 15
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.0.2'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.0'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'
    implementation 'androidx.recyclerview:recyclerview:1.1.0'
}

【问题讨论】：

请显示你的xml文件
@Kirguduck 我已经在问题中添加了 xml 内容。
这能回答你的问题吗？ android.view.View$OnUnhandledKeyEventListener
@Kirguduck 我已经看到了其他解决方案，但我的 gradle 实现是 'implementation 'androidx.appcompat:appcompat:1.0.2' 格式。
请显示你的 gradle 文件

标签： android android-layout view

【解决方案1】：

问题是android.support.v4.view.ViewCompat 没有在新的androidx 包结构中实现View.OnUnhandledKeyEventListener，并且只在支持lib 结构中的API 28 开始实现它（至少在版本28.0.0 中）。因此，警告会出现在 API =28 的设备上。
尝试将此注释添加到您的onCreate()

@RequiresApi(28)
public void onCreate...

来自here 但它不适用于 Api28 之前的设备

【讨论】：

很抱歉，这不起作用。我仍然收到相同的错误消息。
@JangHyeonChoi 我怀疑您尝试在 Nexus 5X API 26 上启动您的应用程序。阅读我上面的答案