position - android span click event

Question

Ok. These are my problems.

1. I need to user regular expressions to filet out everything except for letters and then I need to encase the found words within a $word tag. With this str = str.replaceAll(pattern, "$0");. right now I am filtering all of the right elements (punctuation, numbers etc) but its encasing every letter within each word in an a tag not the word. so how do I use the regular expression to group the letters to a word?

from "(a tag open)t(a close)(a tag open)h(a close)(a tag open)i(a close)(a tag open)s(a close) (a tag open)i(a close)(a tag open)s(a close) (a tag open)w(a close)(a tag open)r(a close)(a tag open)o(a close)(a tag open)n(a close)(a tag open)g(a close)";

to :

"(a tag open)This(a close) (a tag open)is(a close) (a tag open)right(a close)";

then I'm making them clickable and I need to catch the click event and get the position on screen on the clicked word as I want to use the clicked event to make a tool tip show up just below the clicked word. thank you for your help.

public class MainActivity extends Activity {

public String text = "This is just a sentence to test you. 23 this is another number23!g?";
public TextView tv;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);

    text = explode(text);

    tv = (TextView) findViewById(R.id.tv1);

    tv.setLinksClickable(true);
    tv.setMovementMethod(LinkMovementMethod.getInstance());

    Spanned article = Html.fromHtml(text, null, null);
    setHTML(article);
}


public void setHTML(Spanned html) {
      SpannableString message = new SpannableString(html.toString());
      Object[] spans = html.getSpans(0, html.length(), Object.class);
      for (Object span : spans) {
         int start = html.getSpanStart(span);
         int end = html.getSpanEnd(span);
         int flags = html.getSpanFlags(span);
         if (span instanceof URLSpan) {
            URLSpan urlSpan = (URLSpan) span;
            span = new CallbackSpan(urlSpan.getURL());
         }
         message.setSpan(span, start, end, flags);
      }
      tv.setText(message);
   }
    public String explode(String str){  
      String pattern = "([a-zA-Z])";
      str = str.replaceAll(pattern, "<a href="$0">$0</a>");
      return str;
    }

   private final class CallbackSpan extends ClickableSpan {

      private String m_data;
      private String url_main;

      public CallbackSpan(String url) {
         m_data = url.substring(0);
         url_main = url;

      }

      public void onClick(View view) {

          TextView item = (TextView)findViewById(R.id.tv2);
          item.setText(url_main + " was clicked.");
          Log.d("item", url_main);
      }
   }

}

Answer 1

Latest code ,pls see link form github

message.setSpan(span, start, end, flags);

You need remove origin span before set new span. Please see below
The onClick() of ClickableSpan is not working for URLSpan?

EDIT
You can capture any span click event by extends LinkMovementMethod

    import android.os.Handler;
import android.os.Message;
import android.text.Layout;
import android.text.Selection;
import android.text.Spannable;
import android.text.method.LinkMovementMethod;
import android.text.method.MovementMethod;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.widget.TextView;

import java.lang.ref.WeakReference;

public class LinkMovementMethodExt extends LinkMovementMethod {
    public static final int LinkMovementMethod_Down = 1001;
    public static final int LinkMovementMethod_Up = 2002;
    private static LinkMovementMethod sInstance;
    private Class mSpanClass = null;
    private WeakReference<Handler> mWeakReference = null;

    public static MovementMethod getInstance(Handler handler, Class spanClass) {
        if (sInstance == null) {
            sInstance = new LinkMovementMethodExt();
            ((LinkMovementMethodExt) sInstance).mWeakReference = new WeakReference<>(handler);
            ((LinkMovementMethodExt) sInstance).mSpanClass = spanClass;
        }
        return sInstance;
    }

    @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);
            /**
             * get you interest span
             */
            Object[] spans = buffer.getSpans(off, off, mSpanClass);
            if (spans.length != 0) {
                if (action == MotionEvent.ACTION_DOWN) {
                    Selection.setSelection(buffer, buffer.getSpanStart(spans[0]), buffer.getSpanEnd(spans[0]));
                    MessageSpan obj = new MessageSpan();
                    obj.setObj(spans);
                    obj.setView(widget);
                    Handler handler = mWeakReference.get();
                    if (handler != null) {
                        Message message = handler.obtainMessage();
                        message.obj = obj;
                        message.what = LinkMovementMethod_Down;
                        message.sendToTarget();
                        return true;
                    }
                    return false;
                } else if (action == MotionEvent.ACTION_UP) {
                    Handler handler = mWeakReference.get();
                    if (handler != null) {
                        MessageSpan obj = new MessageSpan();
                        obj.setView(widget);
                        Message message = handler.obtainMessage();
                        message.obj = obj;
                        message.what = LinkMovementMethod_Up;
                        message.sendToTarget();
                        return true;
                    }
                    return false;
                }
            }
        }

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

    public boolean canSelectArbitrarily() {
        return true;
    }

    public boolean onKeyUp(TextView widget, Spannable buffer, int keyCode,
                           KeyEvent event) {
        return false;
    }

textView.setMovementMethod(LinkMovementMethodExt.getInstance());

---

Edit for "android developer"
It is better way to add Handler property for LinkMovementMethodExt class.
You can capture all Spanned which are delivered as Message object.

Snip code in onTouchEvent method:

Message message = Handler.obtainMessage();
message.obj = buffer.getSpans(off, off, Spanned.class);//get all spanned
message.what = 111;//which value ,it is up to you
message.sendToTarget(); //send message to you target handler

You can handler expected spanned in you handler class. May be it is flexible way to handle .
Hope to help you.

---

Above textview text is <a href='/a'>aaaa</a>123456<a href='/b'>bbbb</b>7890
I understand you requirement :
Click 'aaaa',you want get its href value '/a', click 'bbbb',get its href '/b'; Do not trigger default action which is opened in web browser.
If my understand is right, you can do like this:

• Set LinkMovementMethod for textview, etc:textview.setMovementMethod(LinkMovementMethodExt.getInstance(handler, URLSpan.class));
• Get interest span, here is URLSpan.
  In you handler handleMessage method, you can do like this:
  

private Handler handler = new Handler() {
      public void handleMessage(Message msg) {
          int what = msg.what;
          if (what == 100) {
              Object[] spans = (Object[])msg.obj;
              for (Object span : spans) {
                  if (span instanceof URLSpan) {
                      System.out.println(((URLSpan) span).getURL());
                  }
              }
          }
      };
  };

---

Download demo code

• MainActivity has color property which you can assign which color value as you like.

How to do?

• Step1, get current click span.

• Step2, set BackgroundColorSpan for current click span