Cannot auto scroll text in TextView

Question

I'm trying to have a auto scroll TextView when my text is too long. I followed every tutorial or tips posted here on stackoverflow (yes I readed a bunch of topics similar to this but no one fixed it).

So I have my activity layout like that:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >

....

<TextView
    android:id="@+id/music_name"
    android:layout_width="fill_parent"
    android:layout_height="60dp"
    android:gravity="center"
    android:text="Music Name"
    android:textSize="24sp"
    android:layout_centerHorizontal="true"
    android:singleLine="true"
    android:scrollHorizontally="true"
    android:ellipsize="marquee"
    android:focusable="true"
    android:focusableInTouchMode="true"
    android:marqueeRepeatLimit="marquee_forever" />

....

</RelativeLayout>

And in OnCreate( ) I do that:

music_name.setSelected(true);
music_name.setMovementMethod(new ScrollingMovementMethod());

music_name is the TextView.

So even doing all that my TextView doesn't scroll. What could be wrong?

EDIT[NEW]: I noticed that it works only for the first time. The other times I change the text on the TextView it doesnt works anymore. What it could be doing that? I have thread (Timer) that wakes up every 50ms to update an SeekBar and other two TextViews, this could be blocking something?

Answer 1

TextView sometimes comes tricky when handling scrolling. The main attributes you've to set into your layout are the following:

android:scrollHorizontally="false"
android:scrollbars="vertical"
android:gravity="bottom"

The gravity set to bottom will make your scrollbar descend to the bottom of your TextView everytime you append a line. So use that only if you want it to be that way.

The music_name.setMovementMethod(new ScrollingMovementMethod()); statement is also needed.

This way it should work.