Heghlight Text in text view

You have to create custom class for scrolling the text:

ScrollTextView.java

public class ScrollTextView extends TextView {

     // scrolling feature
     private Scroller mSlr;

     // milliseconds for a round of scrolling
     private int mRndDuration = 10000;

     // the X offset when paused
     private int mXPaused = 0;

     // whether it's being paused
     private boolean mPaused = true;

     /*
     * constructor
     */
     public ScrollTextView(Context context) {
     this(context, null);
     // customize the TextView
     setSingleLine();
     setEllipsize(null);
     setVisibility(INVISIBLE);
     }

     /*
     * constructor
     */
     public ScrollTextView(Context context, AttributeSet attrs) {
     this(context, attrs, android.R.attr.textViewStyle);
     // customize the TextView
     setSingleLine();
     setEllipsize(null);
     setVisibility(INVISIBLE);
     }

     /*
     * constructor
     */
     public ScrollTextView(Context context, AttributeSet attrs, int defStyle) {
     super(context, attrs, defStyle);
     // customize the TextView
     setSingleLine();
     setEllipsize(null);
     setVisibility(INVISIBLE);
     }

     /**
     * begin to scroll the text from the original position
     */
     public void startScroll() {
     // begin from the very right side
     mXPaused = -1 * getWidth();
     // assume it's paused
     mPaused = true;
     resumeScroll();
     }

     /**
     * resume the scroll from the pausing point
     */
     public void resumeScroll() {

     if (!mPaused)
     return;

     // Do not know why it would not scroll sometimes
     // if setHorizontallyScrolling is called in constructor.
     setHorizontallyScrolling(true);

     // use LinearInterpolator for steady scrolling
     mSlr = new Scroller(this.getContext(), new LinearInterpolator());
     setScroller(mSlr);

     int scrollingLen = calculateScrollingLen();
     int distance = scrollingLen - (getWidth() + mXPaused);
     int duration = (new Double(mRndDuration * distance * 1.00000
     / scrollingLen)).intValue();

     setVisibility(VISIBLE);
     mSlr.startScroll(mXPaused, 0, distance, 0, duration);
     invalidate();
     mPaused = false;
     }

     /**
     * calculate the scrolling length of the text in pixel
     *
     * @return the scrolling length in pixels
     */
     private int calculateScrollingLen() {
     TextPaint tp = getPaint();
     Rect rect = new Rect();
     String strTxt = getText().toString();
     tp.getTextBounds(strTxt, 0, strTxt.length(), rect);
     int scrollingLen = rect.width() + getWidth();
     rect = null;
     return scrollingLen;
     }

     /**
     * pause scrolling the text
     */
     public void pauseScroll() {
     if (null == mSlr)
     return;

     if (mPaused)
     return;

     mPaused = true;

     // abortAnimation sets the current X to be the final X,
     // and sets isFinished to be true
     // so current position shall be saved
     mXPaused = mSlr.getCurrX();

     mSlr.abortAnimation();
     }

     @Override
     /*
     * override the computeScroll to restart scrolling when finished so as that
     * the text is scrolled forever
     */
     public void computeScroll() {
     super.computeScroll();

     if (null == mSlr) return;

     if (mSlr.isFinished() && (!mPaused)) {
     this.startScroll();
     }
     }

     public int getRndDuration() {
     return mRndDuration;
     }

     public void setRndDuration(int duration) {
     this.mRndDuration = duration;
     }

     public boolean isPaused() {
     return mPaused;
     }
    }

In your layout write like this:

<yourpackagename.ScrollTextView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:id="@+id/scrolltext">
    </yourpackagename.ScrollTextView>

In your activity write like this:

ScrollTextView scrolltext=(ScrollTextView) findViewById(R.id.scrolltext);

        scrolltext.setText(yourscrollingtext);
        scrolltext.setTextColor(Color.BLACK);
        scrolltext.startScroll();

If you want to increase the scrolling speed then reduce the value of :

private int mRndDuration = 10000;//reduce the value of mRndDuration to increase scrolling speed