Android中TextView动态设置缩进距离的方法

val spannableString = SpannableString(text)
val what = LeadingMarginSpan.Standard(width, 0)
spannableString.setSpan(what, 0, spannableString.length, SpannableString.SPAN_INCLUSIVE_INCLUSIVE)

class MainActivity2 : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        val tv1 = findViewById<TextView>(R.id.tv1)
        val tv2 = findViewById<TextView>(R.id.tv2)
        tv1.text = "New"
        calculateTag(tv1, tv2, "This is a long long long long title")
    }

    //动态设置缩进距离
    fun calculateTag(tag: TextView, title: TextView, text: String?) {
        val observer = tag.viewTreeObserver
        observer.addOnPreDrawListener(object : ViewTreeObserver.OnPreDrawListener {
            override fun onPreDraw(): Boolean {
                val spannableString = SpannableString(text)
                val what = LeadingMarginSpan.Standard(tag.width + dip2px(this@MainActivity2, 3.0), 0)
                spannableString.setSpan(
                    what,
                    0,
                    spannableString.length,
                    SpannableString.SPAN_INCLUSIVE_INCLUSIVE
                )
                title.text = spannableString
                tag.viewTreeObserver.removeOnPreDrawListener(
                    this
                )
                return false
            }
        })
    }

    fun dip2px(context: Context, dpValue: Double): Int {
        val density: Float = context.resources.displayMetrics.density
        return (dpValue * density + 0.5).toInt()
    }
}

<?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">

    <FrameLayout
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="10dp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <TextView
            android:id="@+id/tv1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="5dp"
            android:layout_marginEnd="3dp"
            android:background="@drawable/bg_tag"
            android:includeFontPadding="false"
            android:paddingHorizontal="2dp"
            android:textColor="@color/white"
            android:textSize="13sp" />

        <TextView
            android:id="@+id/tv2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="@color/black"
            android:textSize="17sp"
            android:textStyle="normal" />
    </FrameLayout>

</androidx.constraintlayout.widget.ConstraintLayout>