Question

我正在为Firebase实时数据库设置一个应用程序。为此，我想在垂直布局中给出数据。问题是当我添加LinearLayoutManager时应用程序停止了。

这是我遵循的教程：https://www.youtube.com/watch?v=71H9-MRXYOE

我已经尝试以不同的方式添加LinearLayoutManager，但是没有一个起作用

public class MainActivity extends AppCompatActivity {

    RecyclerView recyclerView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        recyclerView = findViewById(R.id.recycler_view);
        recyclerView.setLayoutManager(new LinearLayoutManager(this, 
              RecyclerView.VERTICAL, false));

        recyclerView.setAdapter(adapter);

    }

我对使用android编程真的很陌生，对错误代码了解不多。

W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter androidx.vectordrawable.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
I/art: Rejecting re-init on previously-failed class java.lang.Class<androidx.core.view.ViewCompat$OnUnhandledKeyEventListenerWrapper>: java.lang.NoClassDefFoundError: Failed resolution of: Landroid/view/View$OnUnhandledKeyEventListener;
        at void androidx.core.view.ViewCompat.setOnApplyWindowInsetsListener(android.view.View, androidx.core.view.OnApplyWindowInsetsListener) (ViewCompat.java:2203)
        at android.view.ViewGroup androidx.appcompat.app.AppCompatDelegateImpl.createSubDecor() (AppCompatDelegateImpl.java:637)
I/art:     at void androidx.appcompat.app.AppCompatDelegateImpl.ensureSubDecor() (AppCompatDelegateImpl.java:518)
        at void androidx.appcompat.app.AppCompatDelegateImpl.setContentView(int) (AppCompatDelegateImpl.java:466)
        at void androidx.appcompat.app.AppCompatActivity.setContentView(int) (AppCompatActivity.java:140)
        at void com.example.firebasetest.MainActivity.onCreate(android.os.Bundle) (MainActivity.java:34)
        at void android.app.Activity.performCreate(android.os.Bundle) (Activity.java:6679)
        at void android.app.Instrumentation.callActivityOnCreate(android.app.Activity, android.os.Bundle) (Instrumentation.java:1118)
        at android.app.Activity android.app.ActivityThread.performLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent) (ActivityThread.java:2618)
        at void android.app.ActivityThread.handleLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:2726)
        at void android.app.ActivityThread.-wrap12(android.app.ActivityThread, android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:-1)
        at void android.app.ActivityThread$H.handleMessage(android.os.Message) (ActivityThread.java:1477)
        at void android.os.Handler.dispatchMessage(android.os.Message) (Handler.java:102)
        at void android.os.Looper.loop() (Looper.java:154)
        at void android.app.ActivityThread.main(java.lang.String[]) (ActivityThread.java:6119)
        at java.lang.Object java.lang.reflect.Method.invoke!(java.lang.Object, java.lang.Object[]) (Method.java:-2)
        at void com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run() (ZygoteInit.java:886)
        at void com.android.internal.os.ZygoteInit.main(java.lang.String[]) (ZygoteInit.java:776)
    Caused by: java.lang.ClassNotFoundException: Didn't find class "android.view.View$OnUnhandledKeyEventListener" on path: DexPathList[[zip file "/data/app/com.example.firebasetest-2/base.apk", zip file "/data/app/com.example.firebasetest-2/split_lib_dependencies_apk.apk", zip file "/data/app/com.example.firebasetest-2/split_lib_slice_0_apk.apk", zip file "/data/app/com.example.firebasetest-2/split_lib_slice_1_apk.apk", zip file "/data/app/com.example.firebasetest-2/split_lib_slice_2_apk.apk", zip file "/data/app/com.example.firebasetest-2/split_lib_slice_3_apk.apk", zip file "/data/app/com.example.firebasetest-2/split_lib_slice_4_apk.apk", zip file "/data/app/com.example.firebasetest-2/split_lib_slice_5_apk.apk", zip file "/data/app/com.example.firebasetest-2/split_lib_slice_6_apk.apk", zip file "/data/app/com.example.firebasetest-2/split_lib_slice_7_apk.apk", zip file "/data/app/com.example.firebasetest-2/split_lib_slice_8_apk.apk", zip file "/data/app/com.example.firebasetest-2/split_lib_slice_9_apk.apk"],na
        at java.lang.Class dalvik.system.BaseDexClassLoader.findClass(java.lang.String) (BaseDexClassLoader.java:56)
        at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String, boolean) (ClassLoader.java:380)
        at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String) (ClassLoader.java:312)
        at void androidx.core.view.ViewCompat.setOnApplyWindowInsetsListener(android.view.View, androidx.core.view.OnApplyWindowInsetsListener) (ViewCompat.java:2203)
        at android.view.ViewGroup androidx.appcompat.app.AppCompatDelegateImpl.createSubDecor() (AppCompatDelegateImpl.java:637)
        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 com.example.firebasetest.MainActivity.onCreate(android.os.Bundle) (MainActivity.java:34)
        at void android.app.Activity.performCreate(android.os.Bundle) (Activity.java:6679)
        at void android.app.Instrumentation.callActivityOnCreate(android.app.Activity, android.os.Bundle) (Instrumentation.java:1118)
        at android.app.Activity android.app.ActivityThread.performLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent) (ActivityThread.java:2618)
        at void android.app.ActivityThread.handleLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:2726)
        at void android.app.ActivityThread.-wrap12(android.app.ActivityThread, android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:-1)
        at void android.app.ActivityThread$H.handleMessage(android.os.Message) (ActivityThread.java:1477)
        at void android.os.Handler.dispatchMessage(android.os.Message) (Handler.java:102)
        at void android.os.Looper.loop() (Looper.java:154)
        at void android.app.ActivityThread.main(java.lang.String[]) (ActivityThread.java:6119)
        at java.lang.Object java.lang.reflect.Method.invoke!(java.lang.Object, java.lang.Object[]) (Method.java:-2)
        at void com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run() (ZygoteInit.java:886)
        at void com.android.internal.os.ZygoteInit.main(java.lang.String[]) (ZygoteInit.java:776)
I/ViewConfigCompat: Could not find method getScaledScrollFactor() on ViewConfiguration

这是我的布局

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <EditText
        android:id="@+id/edt_title"
        android:hint="Title"
        android:inputType="text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

    <EditText
        android:id="@+id/edt_content"
        android:hint="Content"
        android:inputType="text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

    <Button
        android:id="@+id/btn_post"
        android:text="POST"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

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

</LinearLayout>```

Answer 1

也许这会有所帮助

1]垂直滚动RecyclerView可以通过以下方式实现：-

LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(linearLayoutManager);

2] logcat中的错误显示如下：-

java.lang.ClassNotFoundException：未找到类路径上的“ android.view.View $ OnUnhandledKeyEventListener”： DexPathList [[zip文件“ /data/app/com.example.firebasetest-2/base.apk”，压缩文件 “ /data/app/com.example.firebasetest-2/split_lib_dependencies_apk.apk”，压缩文件 “ /data/app/com.example.firebasetest-2/split_lib_slice_0_apk.apk”，邮政编码文件“ /data/app/com.example.firebasetest-2/split_lib_slice_1_apk.apk”，压缩文件 “ /data/app/com.example.firebasetest-2/split_lib_slice_2_apk.apk”，邮政编码文件“ /data/app/com.example.firebasetest-2/split_lib_slice_3_apk.apk”，压缩文件 “ /data/app/com.example.firebasetest-2/split_lib_slice_4_apk.apk”，邮政编码文件“ /data/app/com.example.firebasetest-2/split_lib_slice_5_apk.apk”，压缩文件 “ /data/app/com.example.firebasetest-2/split_lib_slice_6_apk.apk”，邮政编码文件“ /data/app/com.example.firebasetest-2/split_lib_slice_7_apk.apk”，压缩文件 “ /data/app/com.example.firebasetest-2/split_lib_slice_8_apk.apk”，邮政编码文件 “ /data/app/com.example.firebasetest-2/split_lib_slice_9_apk.apk”]，na

基本上可以解决的问题（主要集中在与Fire base相关的依赖项上）

清理项目依赖项
根据需要将所有依赖项更新到最新版本。

最后

3]清理项目，重建并运行。

Answer 2

您的问题不在LayoutManager中。问题在于此错误消息：

W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter androidx.vectordrawable.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable

这已经被回答了看这个链接 https://stackoverflow.com/a/45191408/11555781

Answer 3

当我将图库切换到RecyclerView时，这个问题对我来说尤为突出。我可以通过将以下依赖项添加到我的build.gradle文件中来解决该问题：

implementation 'androidx.core:core:1.5.0-alpha01'

添加RecyclerView Layoutmanager时我的应用停止了

3 个答案: