android在代码中添加一个横向的网页加载进度条

        val progressBar = ProgressBar(context, null, android.R.attr.progressBarStyleHorizontal)
        progressBar.minimumWidth = 800
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            progressBar.setProgress(30, true)
        }else{
            progressBar.progress = 30
        }
        progressBar.progressDrawable = resources.getDrawable(R.drawable.webview_progress);
        val layoutParams: RelativeLayout.LayoutParams = RelativeLayout.LayoutParams(LayoutParams.MATCH_PARENT, 16)
        layoutParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT)
        layoutParams.addRule(RelativeLayout.ALIGN_PARENT_TOP)
//        val top = 100
//        val left = 200
//        layoutParams.setMargins(left, top, 0, 0)
        addView(progressBar, layoutParams)

webview_progress文件：

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- 背景 -->
    <item android:id="@android:id/background">
        <shape>
            <solid android:color="@color/white" />
        </shape>
    </item>
    <!-- 第二条进度条颜色 -->
    <item android:id="@android:id/secondaryProgress">
        <clip>
            <shape>
                <solid android:color="@color/white" />
            </shape>
        </clip>
    </item>
    <!-- 进度条 -->
    <item android:id="@android:id/progress">
        <clip>
            <shape>
                <solid android:color="#4169E1" />
            </shape>
        </clip>
    </item>
</layer-list>