动态设置线性布局背景

    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#FF0000">
</LinearLayout>

LinearLayout linearLayout = (LinearLayout) findViewById(R.id.linear_layout);
linearLayout.setBackgroundColor(Color.parseColor("#FF0000"));

val linearLayout = findViewById<LinearLayout>(R.id.linear_layout)
linearLayout.setBackgroundColor(Color.parseColor("#FF0000"))

val linearLayout = findViewById<LinearLayout>(R.id.linear_layout)
val colorAnimation = ObjectAnimator.ofArgb(linearLayout, "backgroundColor", Color.parseColor("#FF0000"), Color.parseColor("#00FF00"))
colorAnimation.duration = 1000 // 设置动画持续时间为1秒
colorAnimation.start() // 开始动画