Android：Java / Kotlin的ScrollView中居中的LinearLayout

Question

我在XML中有此代码，并且可以按我的要求工作（LinearLayout位于ScrollView内部居中：]

<ScrollView
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:background="@android:color/holo_red_dark"
        android:layout_gravity="center">

       <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="some text" />

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="some text" />
    </LinearLayout>
</ScrollView>

但是我在Java / Kotlin中需要此代码，但是，我无法正确设置android:layout_gravity，因为LinearLayout仍然位于顶部，而不是居中。这是我的Kotlin代码：

ScrollView(context).also { scrollView ->
    scrollView.layoutParams = ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)

    LinearLayout(context).also { linearLayout ->
        linearLayout.orientation = LinearLayout.VERTICAL
        linearLayout.layoutParams = LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT).apply {
            gravity = Gravity.CENTER // have tried this
            weight = 1f // and have tried this
        }
        linearLayout.gravity = Gravity.CENTER // have tried this
        linearLayout.setBackgroundColor(0xff_00_ff_00.toInt())

        IntRange(0, 2).forEach {
            linearLayout.addView(TextView(context!!).apply {
                text = "some text"
                textSize = 50f
            })
        }

        scrollView.addView(linearLayout)
    }
}

我设法获得它的唯一方法是通过将isFillViewport的true设置为ScrollView，但是在这种情况下LinearLayout占据了整个高度，而这并不是我想要的。将不胜感激，忠告]

Answer 1

解决方案很简单，但是并不明显。我需要将LinearLayout.LayoutParams更改为FrameLayout.LayoutParams。所以Kotlin中的最终代码如下：

ScrollView(context).also { scrollView ->
    scrollView.layoutParams = ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)

    LinearLayout(context).also { linearLayout ->
        // I changed this line of code
        linearLayout.layoutParams = FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT).apply {
            gravity = Gravity.CENTER
        }

        linearLayout.orientation = LinearLayout.VERTICAL
        linearLayout.setBackgroundColor(0xff_00_ff_00.toInt())

        IntRange(0, 1).forEach {
            linearLayout.addView(TextView(context!!).apply {
                text = "some text"
                textSize = 50f
            })
        }

        scrollView.addView(linearLayout)
    }
}