How to animate the textview (very very long text )scroll automatically horizontally

Question

I am not interested in Marquee because, in Marquee you can not control the speed of marquee. I have tried to animate the textview but Parent view clips the text at the end e

Answer 1

Can try out this. This is a solution using TranslateAnimation for creating an auto scrolling text (horizontal scroll, from Right to Left) (Tested on Android 8)

Class: AnimationAutoTextScroller.java

/**
 * A Class for automatically scrolling text horizontally from Right to Left 
 * using TranslateAnimation so that the scrolling speed can be controlled -Suresh Kodoor
 */

public class AnimationAutoTextScroller {

    Animation animator;
    TextView  scrollingTextView;
    int       duration = 50000;  // default value

    public AnimationAutoTextScroller(TextView tv, float screenwidth) {

        this.scrollingTextView = tv;
        this.animator = new TranslateAnimation(
                Animation.ABSOLUTE, screenwidth,
                Animation.RELATIVE_TO_SELF, -1f,
                Animation.RELATIVE_TO_SELF, 0f,
                Animation.RELATIVE_TO_SELF, 0f
        );
        this.animator.setInterpolator(new LinearInterpolator());
        this.animator.setDuration(this.duration);
        this.animator.setFillAfter(true);
        this.animator.setRepeatMode(Animation.RESTART);
        this.animator.setRepeatCount(Animation.INFINITE);

        // setAnimationListener();
    }

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

    public void setScrollingText(String text) {
        this.scrollingTextView.setText(text);
    }

    public void start() {
        this.scrollingTextView.setSelected(true);
        this.scrollingTextView.startAnimation(this.animator);
    }

    public void setAnimationListener() {

        animator.setAnimationListener(new Animation.AnimationListener() {
            public void onAnimationStart(Animation animation) {
            }
            public void onAnimationEnd(Animation animation) {
                // This callback function can be used to perform any task at the end of the Animation
            }
            public void onAnimationRepeat(Animation animation) {
            }
        });
    }
}

Layout XML: (keep the TextView under a HorizontalScrollView)

Activity:

TextView scrollertextview = findViewById(R.id.translateanimatortextviewscroller);
textscroller = new AnimationAutoTextScroller(scrollertextview, screenwidth);
textscroller.setScrollingText(scrollertext);
textscroller.setDuration(60000);
textscroller.start();