安卓按钮背景替换图片无显示

Question

<Button
        android:id="@+id/button7"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:background="@drawable/ic_up_1"
        app:layout_constraintBottom_toTopOf="@+id/button6"
        app:layout_constraintEnd_toStartOf="@+id/guideline"
        app:layout_constraintHorizontal_bias="0.501"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

Answer 1

默认的颜色设置来自于res/values/themes.xml将里面的主题由
parent="Theme.MaterialComponents.DayNight.DarkActionBar"

修改为（其他主题也可以）parent="Theme.MaterialComponents.DayNight.DarkActionBar.Bridge"