滚动字幕并更新文字

Question

我有一个textView文本，每10秒由Runnable更新一次。添加选框效果后我遇到了问题。文本更新时，它会闪烁并显示在其他位置。我该怎么做才能改变字母？

        TextView oneText = (TextView) findViewById(R.id.oneText);
    oneText.setSelected(true);


    handler = new Handler();
    final Runnable r = new Runnable() {
        public void run() {
            try {
                String bigstring = "Some text here";
                oneText.setText(bigstring);
                    handler.postDelayed(this, 20 * 1000);
            } catch (Exception e) {
                Log.e(LOG_TAG, e.getMessage());
            }
        }
    };


            <TextView
            android:id="@+id/oneText"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:singleLine="true"
            android:ellipsize="marquee"
            android:marqueeRepeatLimit="marquee_forever"
            android:focusable="false"
            android:scrollHorizontally="true"
            android:text="@string/someString" />