activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical">

  <!-- character spacing applied to this TextView -->
  <com.sampleapp.CustomTextView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      app:characterSpacing="@dimen/default_character_spacing"/>

  <!-- line spacing applied to this TextView -->
  <com.sampleapp.CustomTextView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_marginTop="16dp"
      app:lineSpacing="@dimen/default_line_spacing"/>
    
</LinearLayout>  

attrs.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="CustomTextView">
        <attr name="characterSpacing" format="float"/>
        <attr name="lineSpacing" format="dimension"/>
    </declare-styleable>
</resources>

CustomTextView.java

public class CustomTextView extends AppCompatTextView {
    public CustomTextView(Context context) {
        super(context);
        init(context,null);
    }

    public CustomTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(context, attrs);
    }

    public CustomTextView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init(context, attrs);
    }

    private void init(Context context, AttributeSet attrs){
        if (!isInEditMode()) {
            TypedArray attributeArray = context.obtainStyledAttributes(
                    attrs,
                    R.styleable.TextView);

            float characterSpacing;
            float lineSpacing;

            try {
                characterSpacing = attributeArray.getFloat(R.styleable.CustomTextView_characterSpacing, 0.0F);
                lineSpacing = attributeArray.getDimension(R.styleable.CustomTextView_lineSpacing, 0);
            } finally {
                attributeArray.recycle();
            }

            setUpCharacterSpacing(characterSpacing);
            setUpLineSpacing(lineSpacing);
        }
    }

    private void setUpLineSpacing(float lineSpacing){
        if(lineSpacing != 0)
            setLineSpacing(lineSpacing - getTextSize(), 1);
    }

    private void setUpCharacterSpacing(float characterSpacing){
        if(characterSpacing != 0.0F){
            if (Build.VERSION.SDK_INT > Build.VERSION_CODES.LOLLIPOP) {
                setLetterSpacing(characterSpacing / (getTextSize() / getResources().getDisplayMetrics().scaledDensity));
            }
        }
    }
}

dimens.xml

<resources>
    <!-- These are the values from the Sketch file -->
    <item name="default_character_spacing" format="float" type="dimen">2.0</item>
    <dimen name="default_line_spacing">40dp</dimen>
</resources>

This will handle character spacing and line spacing of text in a Sketch file.