Android 按钮背景颜色不变，代码更改，但未显示

Question

Android Button background color not changing, CHANGE IN CODE, BUT NOT DISPLAYED I have been using button inside the grid layout. When I am changing the color of the button, its showing the change in the code ,but the color change is not displayed.

enter image description here

<?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=".MainActivity">

    <Button
        android:id="@+id/goButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="161dp"
        android:layout_marginTop="347dp"
        android:layout_marginEnd="156dp"
        android:layout_marginBottom="336dp"
        android:backgroundTint="@android:color/holo_green_light"
        android:padding="40dp"
        android:text="GO"
        android:textSize="60sp"
        android:visibility="invisible"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/timerTextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginTop="16dp"
        android:background="@android:color/holo_orange_light"
        android:padding="10dp"
        android:text="30s"
        android:textSize="40sp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/scoreTextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="16dp"
        android:background="@android:color/holo_blue_bright"
        android:padding="10dp"
        android:text="0/0"
        android:textSize="40sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/sumTextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:padding="15dp"
        android:text="31+7"
        android:textSize="30dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <androidx.gridlayout.widget.GridLayout
        android:layout_width="373dp"
        android:layout_height="583dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="75dp"
        android:layout_marginEnd="8dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/timerTextView">

        <Button
            android:id="@+id/button2"
            android:layout_width="340dp"
            android:layout_height="518dp"
            android:background="@android:color/holo_red_light"/* 
                      THE COLOR CHANGED IS NOT DISPLAYED */
            android:backgroundTint="@color/teal_200"
            android:tag="0"
            android:text="14"
            android:textColor="#263238"
            android:textSize="80sp"
            app:layout_column="0"
            app:layout_columnWeight="1"
            app:layout_gravity="fill"
            app:layout_row="0"
            app:layout_rowWeight="1" />
    </androidx.gridlayout.widget.GridLayout>
</androidx.constraintlayout.widget.ConstraintLayout>

Answer 1

不用这个试试

android:background="@android:color/holo_red_light"