activity_login.xml
<?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="match_parent"
android:layout_height="match_parent"
tools:context=".Login">
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="40dp"
android:layout_marginEnd="8dp"
android:fontFamily="sans-serif-black"
android:text="LogIn"
android:textColor="#641FE4"
android:textSize="25sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.502"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
Material Button
<com.google.android.material.button.MaterialButton
android:id="@+id/button"
android:layout_width="123dp"
android:layout_height="50dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="32dp"
android:fontFamily="sans-serif-black"
android:text="Go!"
android:textAllCaps="false"
android:backgroundTint="#203377"
android:textSize="17sp"
app:cornerRadius="20dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textInputLayout2"
app:layout_constraintVertical_bias="0.113"
app:rippleColor="#03A9F4" />
</androidx.constraintlayout.widget.ConstraintLayout>
这是布局文件。当我添加另一个按钮时,会导致渲染问题。当我重新启动Studio时,它不会引发错误,但是在构建后会引发异常java.lang.ClassCastException@b46a6ec
最佳答案
检查是否已添加材料设计库。