无法获得按钮的背景颜色

我试图获得当前背景色的按钮从一项随机调色板。 然而，我的程序是始终崩溃时，我尝试下列代码。

int activeColor = ((ColorDrawable)color1.getBackground()).getColor();

我总是获得这条错误消息。

    Process: com.boredgiant.chora, PID: 17418
    java.lang.ClassCastException: android.graphics.drawable.RippleDrawable cannot be cast to android.graphics.drawable.ColorDrawable
        at com.boredgiant.chora.DrawActivity$103.onClick(DrawActivity.java:850)
        at android.view.View.performClick(View.java:6314)
        at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1119)
        at android.view.View$PerformClick.run(View.java:24793)
        at android.os.Handler.handleCallback(Handler.java:790)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:6543)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:440)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:810)