androidx-master-dev/frameworks/support/slices/view/src/main/java/slice/widget/RowView.java

RowView.java

private void addRange() {
        if (mHandler == null) {
            mHandler = new Handler();
        }

        SliceItem style = SliceQuery.findSubtype(mRangeItem, FORMAT_INT, SUBTYPE_RANGE_MODE);
        final boolean isIndeterminate = style != null && style.getInt() == INDETERMINATE_RANGE;
        final boolean isSeekBar = FORMAT_ACTION.equals(mRangeItem.getFormat());
        final boolean renderInNewLine = mStartItem == null;
        final ProgressBar progressBar;
        if (isSeekBar) {
            android.util.Log.d("ROWVIEW", "Build custom SeekBar.");
            //if (renderInNewLine) {
                //progressBar = new SeekBar(getContext());
            //} else {
                progressBar = (SeekBar) LayoutInflater.from(getContext()).inflate(
                        R.layout.abc_slice_seekbar_view, this, false);
            //}
        } else {
            if (renderInNewLine) {
                progressBar = new ProgressBar(getContext(), null,
                        android.R.attr.progressBarStyleHorizontal);
            } else {
                progressBar = (ProgressBar) LayoutInflater.from(getContext()).inflate(
                        R.layout.abc_slice_progress_inline_view, this, false);
            }
        }
        ...