Goodbye `shape` - AndroidのMaterialButtonがすごい良かった話

Getting started with Material Components for Android

style="@style/Widget.MaterialComponents.Button"

style="@style/Widget.MaterialComponents.Button.UnelevatedButton"

style="@style/Widget.MaterialComponents.Button.OutlinedButton"

style="@style/Widget.MaterialComponents.Button.TextButton"

style="@style/Widget.MaterialComponents.Button.Icon"

style="@style/Widget.MaterialComponents.Button.TextButton.Icon"

build.gradle(Project)

    repositories {
        google() // ←確認
        jcenter()
 
    }

build.gradle(app)

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.core:core-ktx:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation 'com.google.android.material:material:1.0.0-alpha1'　// ←追加
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
}

activity_main.xml

    <com.google.android.material.button.MaterialButton
        android:textAppearance="@style/TextAppearance.MaterialComponents.Button"
        app:backgroundTint="@color/colorPrimary"
        android:id="@+id/buttonClear"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/button_clear"
        app:layout_constraintBottom_toBottomOf="@+id/imageView"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@+id/imageView"
        app:layout_constraintTop_toTopOf="@+id/imageView" />