android - Automatic horizontal scroll in TextView

Question

I have custom gallery. Gallery represents items that are frame layout. There are one imageView and textView above it.

If text in textView is too long, i need it to be scrolled automatically. It's one line of text, and it's needed to be scrolled horizontally.

I've found this snippet of code:

TextView
    android:text="Single-line text view that scrolls automatically"       
    android:singleLine="true" 
    android:ellipsize="marquee"
    android:marqueeRepeatLimit ="marquee_forever"
    android:focusable="true"
    android:focusableInTouchMode="true" 
    android:scrollHorizontally="true"
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content"/>   

It works in my test app with only one text view in it. But it doesn't work in my gallery. Noting happens, text just stay still.

Any help?

Answer 1

Try this custom TextView class:

public class AutoScrollingTextView extends TextView {
    public AutoScrollingTextView(Context context, AttributeSet attrs,
            int defStyle) {
        super(context, attrs, defStyle);
    }

    public AutoScrollingTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public AutoScrollingTextView(Context context) {
        super(context);
    }

    @Override
    protected void onFocusChanged(boolean focused, int direction,
            Rect previouslyFocusedRect) {
        if (focused) {
            super.onFocusChanged(focused, direction, previouslyFocusedRect);
        }
    }

    @Override
    public void onWindowFocusChanged(boolean focused) {
        if (focused) {
            super.onWindowFocusChanged(focused);
        }
    }

    @Override
    public boolean isFocused() {
        return true;
    }
}

and set the following XML attributes:

android:scrollHorizontally="true"
android:ellipsize="marquee"
android:marqueeRepeatLimit="marquee_forever"

This works beautifully in my dictionary apps where multiple entries may need to auto-scroll simultaneously to display complete content.