Android 代码在模拟器中打开时崩溃

Question

我对 java 很陌生，但出于某种原因，试图创建一个应用程序 该应用程序在 android studio 中正确构建，但是，当尝试在模拟器中打开时，它崩溃了。 This 是我的完整代码

是应用程序的zip，我猜，主要错误是

final View rootView = inflater.inflate(R.layout.fragment_sun, container, false); 

Logcat：错误

2019-07-25 10:42:48.002 5383-5383/com.example.phocast E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.phocast, PID: 5383
    android.view.InflateException: Binary XML file line #2: Binary XML file line #2: Error inflating class android.support.v7.widget.RecyclerView
    Caused by: android.view.InflateException: Binary XML file line #2: Error inflating class android.support.v7.widget.RecyclerView
    Caused by: java.lang.ClassNotFoundException: Didn't find class "android.support.v7.widget.RecyclerView" on path: DexPathList[[zip file "/data/app/com.example.phocast-j1KYRRVBUGO2ddQzmNBB8w==/base.apk", zip file "/data/app/com.example.phocast-j1KYRRVBUGO2ddQzmNBB8w==/split_lib_dependencies_apk.apk", zip file "/data/app/com.example.phocast-j1KYRRVBUGO2ddQzmNBB8w==/split_lib_resources_apk.apk", zip file "/data/app/com.example.phocast-j1KYRRVBUGO2ddQzmNBB8w==/split_lib_slice_0_apk.apk", zip file "/data/app/com.example.phocast-j1KYRRVBUGO2ddQzmNBB8w==/split_lib_slice_1_apk.apk", zip file "/data/app/com.example.phocast-j1KYRRVBUGO2ddQzmNBB8w==/split_lib_slice_2_apk.apk", zip file "/data/app/com.example.phocast-j1KYRRVBUGO2ddQzmNBB8w==/split_lib_slice_3_apk.apk", zip file "/data/app/com.example.phocast-j1KYRRVBUGO2ddQzmNBB8w==/split_lib_slice_4_apk.apk", zip file "/data/app/com.example.phocast-j1KYRRVBUGO2ddQzmNBB8w==/split_lib_slice_5_apk.apk", zip file "/data/app/com.example.phocast-j1KYRRVBUGO2ddQzmNBB8w==/split_lib_slice_6_apk.apk", zip file "/data/app/com.example.phocast-j1KYRRVBUGO2ddQzmNBB8w==/split_lib_slice_7_apk.apk", zip file "/data/app/com.example.phocast-j1KYRRVBUGO2ddQzmNBB8w==/split_lib_slice_8_apk.apk", zip file "/data/app/com.example.phocast-j1KYRRVBUGO2ddQzmNBB8w==/split_lib_slice_9_apk.apk"],nativeLibraryDirectories=[/data/app/com.example.phocast-j1KYRRVBUGO2ddQzmNBB8w==/lib/x86, /system/lib, /vendor/lib]]
        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:125)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
        at android.view.LayoutInflater.createView(LayoutInflater.java:606)
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:790)
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
        at com.example.phocast.ui.main.SunFragment.onCreateView(SunFragment.java:69)
        at androidx.fragment.app.Fragment.performCreateView(Fragment.java:2439)
        at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManager.java:1460)
        at androidx.fragment.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1784)

SunFragment.java 代码的第 69 行。

我不明白 XML 出了什么问题。

对应的XML是：

    <?xml version="1.0" encoding="utf-8"?>
    <android.support.v7.widget.RecyclerView
        android:id="@+id/rv_recycler_view"
        android:scrollbars="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        xmlns:android="http://schemas.android.com/apk/res/android" />

有人可以检查一下吗？

build.gradel

apply plugin: 'com.android.application'

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.1"
    defaultConfig {
        applicationId "com.example.phocast"
        minSdkVersion 21
        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 'com.google.android.material:material:1.0.0'
    implementation'com.google.android.gms:play-services-places:17.0.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation 'androidx.lifecycle:lifecycle-extensions:2.0.0'
    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test:runner:1.2.0'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
    implementation 'org.shredzone.commons:commons-suncalc:2.6'
    implementation 'androidx.cardview:cardview:1.0.0'
    implementation 'androidx.recyclerview:recyclerview:1.0.0'
    implementation 'com.github.bumptech.glide:glide:3.7.0'
    implementation 'com.google.android.gms:play-services-maps:17.0.0'
    implementation 'com.google.android.gms:play-services-location:17.0.0'
}

Answer 1

使用

androidx.recyclerview.widget.RecyclerView

在fragment_sun.xml 中而不是

android.support.v7.widget.RecyclerView

因为在 build.gradle 中依赖是 androidx.recyclerview:recyclerview:1.0.0 但在 SunFragment 中 RecyclerView 是从 androidx 导入的

Answer 2

您正在使用androidx 支持库，因此请使用androidx.recyclerview.widget.RecyclerView

<androidx.recyclerview.widget.RecyclerView
    android:id="@+id/rv_recycler_view"
    android:scrollbars="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:android="http://schemas.android.com/apk/res/android" />

Answer 3

以下截图来自您的项目搜索结果：

尝试将所有android.support.v7 包替换为对应的androidx 包

请参阅Migrating to AndroidX 了解详细的包映射。

例如改变

android.support.v7.widget.RecyclerView

到

androidx.recyclerview.widget.RecyclerView

这是因为您的源代码使用 AndroidsX 包，但您的 xml 布局声明使用 android support 包这是错误的。