使用Material Button会导致ClassNotFound运行时错误。
使用Material Button会导致ClassNotFound运行时错误。
我正在用Material Buttons替换我的应用中的按钮，使用XML文件中的
我学习了代码实验室"MDC-101 Android: Material Components (MDC) Basics (Java)"，了解如何使用Material Button。我在gradle.build（Module:app）文件中添加了依赖项，就像实验室中的代码一样。
实验室中的代码可以编译和运行。我的应用程序可以编译，但在填充片段布局时出现错误：
E/AndroidRuntime: FATAL EXCEPTION: main
Process: nl.kl_solutions.schedulecompareforzermelo, PID: 16708
android.view.InflateException: Binary XML file line #26: Binary XML file line #26: Error inflating class com.google.android.material.button.MaterialButton
Caused by: android.view.InflateException: Binary XML file line #26: Error inflating class com.google.android.material.button.MaterialButton
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.google.android.material.button.MaterialButton" on path: DexPathList[[zip file "/data/app/nl.kl_solutions.schedulecompareforzermelo-o6fuvqQPirym08EhaTRI6Q==/base.apk", zip file "/data/app/nl.kl_solutions.schedulecompareforzermelo-o6fuvqQPirym08EhaTRI6Q==/split_lib_dependencies_apk.apk", zip file "/data/app/nl.kl_solutions.schedulecompareforzermelo-o6fuvqQPirym08EhaTRI6Q==/split_lib_resources_apk.apk", zip file "/data/app/nl.kl_solutions.schedulecompareforzermelo-o6fuvqQPirym08EhaTRI6Q==/split_lib_slice_0_apk.apk", zip file "/data/app/nl.kl_solutions.schedulecompareforzermelo-o6fuvqQPirym08EhaTRI6Q==/split_lib_slice_1_apk.apk", zip file "/data/app/nl.kl_solutions.schedulecompareforzermelo-o6fuvqQPirym08EhaTRI6Q==/split_lib_slice_2_apk.apk", zip file "/data/app/nl.kl_solutions.schedulecompareforzermelo-o6fuvqQPirym08EhaTRI6Q==/split_lib_slice_3_apk.apk", zip file "/data/app/nl.kl_solutions.schedulecompareforzermelo-o6fuvqQPirym08EhaTRI6Q==/split_lib_slice_4_apk.apk", zip file "/data/app/nl.kl_solutions.schedulecompareforzermelo-o6fuvqQPirym08EhaTRI6Q==/split_lib_slice_5_apk.apk", zip file "/data/app/nl.kl_solutions.schedulecompareforzermelo-o6fuvqQPirym08EhaTRI6Q==/split_lib_slice_6_apk.apk", zip file "/data/app/nl.kl_solutions.schedulecompareforzermelo-o6fuvqQPirym08EhaTRI6Q==/split_lib_slice_7_apk.apk", zip file "/data/app/nl.kl_solutions.schedulecompareforzermelo-o6fuvqQPirym08EhaTRI6Q==/split_lib_slice_8_apk.apk", zip file "/data/app/nl.kl_solutions.schedulecompareforzermelo-o6fuvqQPirym08EhaTRI6Q==/split_lib_slice_9_apk.apk"],nativeLibraryDirectories=[/data/app/nl.kl_solutions.schedulecompareforzermelo-o6fuvqQPirym08EhaTRI6Q==/lib/x86_64, /system/lib64]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:134)
这是我的布局文件的片段：
android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" android:background="@color/primaryLightColor" android:paddingLeft="@dimen/rasterleftpadding" android:paddingRight="@dimen/rasterrightpadding" > android:id="@+id/btn_previous" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:layout_gravity="left" android:text="prev" /> android:id="@+id/btn_week" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:layout_weight="1" /> android:id="@+id/btn_next" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="right" android:layout_weight="1" android:text="next" /> 这是onCreateView的片段： @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate the layout for this fragment View fragmentLayout = inflater.inflate(R.layout.fragment_week_schedule, container, false); //get references to the buttonBar buttons. leftButton = fragmentLayout.findViewById(R.id.btn_previous); rightButton = fragmentLayout.findViewById(R.id.btn_next); dateButton = fragmentLayout.findViewById(R.id.btn_week); 我只是将dateButton更改为Material Button，这给我带来了错误。当使用普通的Button时，应用程序运行正常。 这是我的gradle.build文件： dependencies { implementation fileTree(dir: 'libs', include: ['*.jar']) implementation "com.android.support:appcompat-v7:$rootProject.supportVersion" implementation "com.android.support:preference-v7:$rootProject.supportVersion" implementation "com.android.support:recyclerview-v7:$rootProject.supportVersion" implementation "com.android.support:cardview-v7:$rootProject.supportVersion" implementation "com.android.support.constraint:constraint-layout:1.1.3" implementation "com.android.support:design:$rootProject.supportVersion" implementation "com.android.support:support-v4:$rootProject.supportVersion" implementation 'com.google.code.gson:gson:2.8.5' testImplementation 'junit:junit:4.12' androidTestImplementation 'com.android.support.test:runner:1.0.2' androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2' //database components implementation "android.arch.persistence.room:runtime:$rootProject.roomVersion" annotationProcessor "android.arch.persistence.room:compiler:$rootProject.roomVersion" // Lifecycle components implementation "android.arch.lifecycle:extensions:$rootProject.archLifecycleVersion" annotationProcessor "android.arch.lifecycle:compiler:$rootProject.archLifecycleVersion" //QR library implementation 'me.dm7.barcodescanner:zxing:1.9.8' } 其中$rootProject.supportVersion是28.0.0-beta01。我知道rc-01和rc02的一些库可用，但我使用了beta01的依赖项运行了代码实验室，所以决定保持这个版本以减少更改。 有人知道是什么原因导致运行时错误吗？