How can I use onTouchListeners on each word in a TextView?

Question

I would like to assign onTouchListeners to each word in a TextView. (Not to link to something on the internet, but just to continue the game logic inside the app). The gener

Answer 1

So I copied ClickableSpan.java and made TouchableSpan.java:

import android.text.TextPaint;
import android.text.style.CharacterStyle;
import android.text.style.UpdateAppearance;
import android.view.MotionEvent;
import android.view.View;

/**
 * If an object of this type is attached to the text of a TextView
 * with a movement method of LinkTouchMovementMethod, the affected spans of
 * text can be selected.  If touched, the {@link #onTouch} method will
 * be called.
 */
public abstract class TouchableSpan extends CharacterStyle implements UpdateAppearance     {

    /**
     * Performs the touch action associated with this span.
     * @return 
     */
    public abstract boolean onTouch(View widget, MotionEvent m);

    /**
     * Could make the text underlined or change link color.
     */
    @Override
    public abstract void updateDrawState(TextPaint ds);

}

And I extended LinkMovementMethod.java to LinkTouchMovementMethod.java. The onTouchEvent method is the same the same except for a mention of onClick is changed to onTouch and a new line is added:

import android.text.Layout;
import android.text.Selection;
import android.text.Spannable;
import android.text.method.LinkMovementMethod;
import android.view.MotionEvent;
import android.widget.TextView;

public class LinkTouchMovementMethod extends LinkMovementMethod
{

    @Override
    public boolean onTouchEvent(TextView widget, Spannable buffer,
                            MotionEvent event) {
        int action = event.getAction();

        if (action == MotionEvent.ACTION_UP ||
            action == MotionEvent.ACTION_DOWN) {
            int x = (int) event.getX();
            int y = (int) event.getY();

            x -= widget.getTotalPaddingLeft();
            y -= widget.getTotalPaddingTop();

            x += widget.getScrollX();
            y += widget.getScrollY();

            Layout layout = widget.getLayout();
            int line = layout.getLineForVertical(y);
            int off = layout.getOffsetForHorizontal(line, x);

            TouchableSpan[] link = buffer.getSpans(off, off, TouchableSpan.class);

            if (link.length != 0) {
                if (action == MotionEvent.ACTION_UP) {
                    link[0].onTouch(widget,event); //////// CHANGED HERE
                } else if (action == MotionEvent.ACTION_DOWN) {
                    link[0].onTouch(widget,event); //////// ADDED THIS
                    Selection.setSelection(buffer,
                                           buffer.getSpanStart(link[0]),
                                           buffer.getSpanEnd(link[0]));
                }

                return true;
            } else {
                Selection.removeSelection(buffer);
            }
        }

        return super.onTouchEvent(widget, buffer, event);
    }

}

And set the MovementMethod appropriately in your code:

TextView tv = (TextView) findViewById(R.id.tv);
tv.setMovementMethod(new LinkTouchMovementMethod());

Now to show the text:

touchableSpan = new TouchableSpan() {

    public boolean onTouch(View widget, MotionEvent m) {

        ...

    }

    public void updateDrawState(TextPaint ds) {
        ds.setUnderlineText(false);
        ds.setAntiAlias(true);
    }

};

String rv = "Text to span";

text = new SpannableString(rv);

text.setSpan(touchableSpan, begin, end, 0);

tv.setText(text, BufferType.SPANNABLE);