使用Material Button会导致ClassNotFound运行时错误 [英] Using Material Button gives ClassNotFound runtime error
问题描述
我正在使用XML文件中的<com.google.android.material.button.MaterialButton和Java片段文件中的private MaterialButton dateButton;用材质按钮替换我应用程序中的按钮.
我研究了代码实验室" MDC-101 Android:材料组件(MDC)基础知识(Java)"，了解如何使用材质按钮".在gradle.build(Module:app)文件中，我像在代码实验室中一样添加了依赖项.
代码实验室可以编译并正常运行.我的应用程序可以很好地编译，但是在增加片段布局时会出现错误:
I am in the process of replacing the buttons in my app with Material Buttons using <com.google.android.material.button.MaterialButton in the XML file and private MaterialButton dateButton; in the Java fragment file.
I studied the Code Lab "MDC-101 Android: Material Components (MDC) Basics (Java)" to see how a Material Button is used. In the gradle.build (Module:app) file I added the dependencies like in the code lab.
The code lab compiles and runs fine. My app compiles fine but gives an error when inflating the fragment layout:
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)
这是我的布局文件中的摘录:
This is a snippet from my layout file:
<LinearLayout
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" >
<Button
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" />
<com.google.android.material.button.MaterialButton
android:id="@+id/btn_week"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1"
/>
<Button
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" />
</LinearLayout>
这是onCreateView的一个片段:
And here is a snippet from the onCreateView:
@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);
我只将datebutton更改为Material Button，这给了我错误.将普通按钮用作dateButton时，该应用程序运行良好.
I only changed the datebutton to a Material Button which gives me the error. The app runs fine when using an ordinary Button for the dateButton.
这是我的gradle.build文件:
This is my gradle.build file:
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为28.0.0-beta01.我知道某些库的rc-01和rc02可用，但是我运行了带有beta01依赖项的代码实验室，因此决定保留此版本以最小化更改.
where $rootProject.supportVersion is 28.0.0-beta01. I know that rc-01 and rc02 for some libraries are available but I ran the code lab with the beta01 dependencies so decided to keep this version to minimize changes.
有人知道导致运行时错误的原因吗?
Anybody knows what is causing the runtime error?
推荐答案
如建议在这里，您必须在build.gradle中添加一个依赖项:
As it suggest HERE you have to add a dependency in your build.gradle:
implementation 'com.google.android.material:material:1.0.0-beta01'
或者，如果您已经在使用Google支持设计库，则必须将应用程序主题更改为从Material Components主题继承
Or if you already use google support design library you must change your app theme to inherit from a Material Components theme
<style name="Theme.MyApp" parent="Theme.MaterialComponents.Light">
<!-- ... -->
如果您不能将主题更改为从Material Components主题继承，则可以从Material Components Bridge主题继承.
If you cannot change your theme to inherit from a Material Components theme, you can inherit from a Material Components Bridge theme.
<style name="Theme.MyApp" parent="Theme.MaterialComponents.Light.Bridge">
<!-- ... -->
雷斯克怎么说:
请注意，现在它已经超出beta了！因此，您可以使用实现'com.google.android.material:material:1.0.0'
note that it is out of beta now! So you can use implementation 'com.google.android.material:material:1.0.0'
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