handle textview link click in my android app

Question

I m currently rendering HTML input in a TextView like so   tv setText Html fromHtml   lt a href  test  gt test lt  a gt        The HTML being displayed is provided to me via an external resource  so I cannot change things around as I will  but I can  of course  do some regex tampering with the HTML  to change the href value  say  to something else   What I want is to be able to handle a link click directly from within the app  rather than having the link open a browser window  Is this achievable at all  I m guessing it would be possible to set the protocol of the href-value to something like  myApp      and then register something that would let my app handle that protocol  If this is indeed the best way  I d like to know how that is done  but I m hoping there s an easier way to just say   when a link is clicked in this textview  I want to raise an event that receives the href value of the link as an input parameter

User · Answer

if there are multiple links in the text view . For example textview has "https://" and "tel no" we can customise the LinkMovement method and handle clicks for words based on a pattern. Attached is the customised Link Movement Method.

public class CustomLinkMovementMethod extends LinkMovementMethod
{

private static Context movementContext;

private static CustomLinkMovementMethod linkMovementMethod = new CustomLinkMovementMethod();

public boolean onTouchEvent(android.widget.TextView widget, android.text.Spannable buffer, android.view.MotionEvent event)
{
    int action = event.getAction();

    if (action == MotionEvent.ACTION_UP)
    {
        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);

        URLSpan[] link = buffer.getSpans(off, off, URLSpan.class);
        if (link.length != 0)
        {
            String url = link[0].getURL();
            if (url.startsWith("https"))
            {
                Log.d("Link", url);
                Toast.makeText(movementContext, "Link was clicked", Toast.LENGTH_LONG).show();
            } else if (url.startsWith("tel"))
            {
                Log.d("Link", url);
                Toast.makeText(movementContext, "Tel was clicked", Toast.LENGTH_LONG).show();
            } else if (url.startsWith("mailto"))
            {
                Log.d("Link", url);
                Toast.makeText(movementContext, "Mail link was clicked", Toast.LENGTH_LONG).show();
            }
            return true;
        }
    }

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

public static android.text.method.MovementMethod getInstance(Context c)
{
    movementContext = c;
    return linkMovementMethod;
}

This should be called from the textview in the following manner:

textViewObject.setMovementMethod(CustomLinkMovementMethod.getInstance(context));

User · Answer

Coming at this almost a year later  there s a different manner in which I solved my particular problem  Since I wanted the link to be handled by my own app  there is a solution that is a bit simpler   Besides the default intent filter  I simply let my target activity listen to ACTION VIEW intents  and specifically  those with the scheme com package name   lt intent-filter gt       lt category android name  android intent category DEFAULT    gt       lt action android name  android intent action VIEW    gt       lt data android scheme  com package name    gt     lt  intent-filter gt    This means that links starting with com package name    will be handled by my activity   So all I have to do is construct a URL that contains the information I want to convey   com package name   action-to-perform id-that-might-be-needed    In my target activity  I can retrieve this address   Uri data   getIntent   getData      In my example  I could simply check data for null values  because when ever it isn t null  I ll know it was invoked by means of such a link  From there  I extract the instructions I need from the url to be able to display the appropriate data

User · Answer

for who looks for more options here is a one     Set text within a  TextView  TextView textView    TextView  findViewById R id textView   textView setText  Hey  sarah  where did  jim go   lost       Style clickable spans based on pattern new PatternEditableBuilder        addPattern Pattern compile        w      Color BLUE         new PatternEditableBuilder SpannableClickedListener              Override         public void onSpanClicked String text                Toast makeText MainActivity this   Clicked username      text                  Toast LENGTH SHORT  show                 into textView     RESOURCE   CodePath

User · Answer

public static void setTextViewFromHtmlWithLinkClickable TextView textView  String text        Spanned result      if  android os Build VERSION SDK INT  gt   android os Build VERSION CODES N            result   Html fromHtml text  Html FROM HTML MODE LEGACY         else           result   Html fromHtml text             textView setText result       textView setMovementMethod LinkMovementMethod getInstance

User · Answer

Solution  I have implemented a small class with the help of which you can handle long clicks on TextView itself and Taps on the links in the TextView   Layout  TextView android id    id text                  android layout width  wrap content                  android layout height  wrap content                  android autoLink  all   gt    TextViewClickMovement java  import android content Context  import android text Layout  import android text Spannable  import android text method LinkMovementMethod  import android text style ClickableSpan  import android util Patterns  import android view GestureDetector  import android view MotionEvent  import android widget TextView   public class TextViewClickMovement extends LinkMovementMethod        private final String TAG   TextViewClickMovement class getSimpleName         private final OnTextViewClickMovementListener mListener      private final GestureDetector                 mGestureDetector      private TextView                              mWidget      private Spannable                             mBuffer       public enum LinkType                Indicates that phone link was clicked            PHONE               Identifies that URL was clicked            WEB URL               Identifies that Email Address was clicked            EMAIL ADDRESS               Indicates that none of above mentioned were clicked            NONE                       Interface used to handle Long clicks on the   link TextView  and taps        on the phone  web  mail links inside of   link TextView               public interface OnTextViewClickMovementListener                           This method will be invoked when user press and hold            finger on the   link TextView                         param linkText Text which contains link on which user presses              param linkType Type of the link can be one of   link LinkType  enumeration                     void onLinkClicked final String linkText  final LinkType linkType                                       param text Whole text of   link TextView                      void onLongClick final String text               public TextViewClickMovement final OnTextViewClickMovementListener listener  final Context context            mListener          listener          mGestureDetector   new GestureDetector context  new SimpleOnGestureListener                 Override     public boolean onTouchEvent final TextView widget  final Spannable buffer  final MotionEvent event             mWidget   widget          mBuffer   buffer          mGestureDetector onTouchEvent event            return false                        Detects various gestures and events         Notify users when a particular motion event has occurred              class SimpleOnGestureListener extends GestureDetector SimpleOnGestureListener            Override         public boolean onDown MotionEvent event                   Notified when a tap occurs              return true                      Override         public void onLongPress MotionEvent e                   Notified when a long press occurs              final String text   mBuffer toString                 if  mListener    null                    Log d TAG   ---- gt  Long Click Occurs on TextView with ID      mWidget getId       n                                       Text      text     n lt ----                     mListener onLongClick text                                     Override         public boolean onSingleTapConfirmed MotionEvent event                   Notified when tap occurs              final String linkText   getLinkText mWidget  mBuffer  event                LinkType linkType   LinkType NONE               if  Patterns PHONE matcher linkText  matches                      linkType   LinkType PHONE                            else if  Patterns WEB URL matcher linkText  matches                      linkType   LinkType WEB URL                            else if  Patterns EMAIL ADDRESS matcher linkText  matches                      linkType   LinkType EMAIL ADDRESS                             if  mListener    null                    Log d TAG   ---- gt  Tap Occurs on TextView with ID      mWidget getId       n                                       Link Text      linkText     n                                       Link Type      linkType     n lt ----                     mListener onLinkClicked linkText  linkType                              return false                     private String getLinkText final TextView widget  final Spannable buffer  final MotionEvent event                 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                ClickableSpan   link   buffer getSpans off  off  ClickableSpan class                if  link length    0                    return buffer subSequence buffer getSpanStart link 0                            buffer getSpanEnd link 0    toString                               return                         Usage  TextView tv    TextView  v findViewById R id textview   tv setText Html fromHtml   lt a href  test  gt test lt  a gt      textView setMovementMethod new TextViewClickMovement this  context      Links  Hope this helps  You can find code here

User · Answer

its very simple add this line to your code   tv setMovementMethod LinkMovementMethod getInstance

User · Answer

Just to share an alternative solution using a library I created   With Textoo  this can be achieved like   TextView locNotFound   Textoo      config  TextView  findViewById R id view location disabled        addLinksHandler new LinksHandler              Override         public boolean onClick View view  String url                if   internal   settings location  equals url                     Intent locSettings   new Intent android provider Settings ACTION LOCATION SOURCE SETTINGS                   startActivity locSettings                   return true                else                   return false                                      apply      Or with dynamic HTML source   String htmlSource    Links   lt a href  http   www google com  gt Google lt  a gt    Spanned linksLoggingText   Textoo      config htmlSource       parseHtml        addLinksHandler new LinksHandler              Override         public boolean onClick View view  String url                Log i  MyActivity    Linking to google                   return false     event not handled   Continue default processing i e  link to google                       apply    textView setText linksLoggingText

User · Answer

I changed the TextView s color to blue by using for example    android textColor   3399FF    in the xml file  How to make it underlined is explained here    Then use its onClick property to specify a method  I m guessing you could call setOnClickListener this  as another way   e g    myTextView setOnClickListener new OnClickListener     public void onClick View v        doSomething            In that method  I can do whatever I want as normal  such as launch an intent   Note that you still have to do the normal myTextView setMovementMethod LinkMovementMethod getInstance     thing  like in your acitivity s onCreate   method

User · Answer

Example  Suppose you have set some text in textview and you want to provide a link on a particular text expression   Click on  facebook will take you to facebook com   In layout xml     lt TextView             android id    id testtext              android layout width  wrap content              android layout height  wrap content    gt    In Activity   String text      Click on  facebook will take you to facebook com   tv setText text   Pattern tagMatcher   Pattern compile       A-Za-z0-9-     b    String newActivityURL    content   ankit testactivity    Linkify addLinks tv  tagMatcher  newActivityURL     Also create one tag provider as   public class TagProvider extends ContentProvider         Override     public int delete Uri arg0  String arg1  String   arg2               TODO Auto-generated method stub         return 0              Override     public String getType Uri arg0            return  vnd android cursor item vnd cc tag               Override     public Uri insert Uri arg0  ContentValues arg1               TODO Auto-generated method stub         return null              Override     public boolean onCreate                TODO Auto-generated method stub         return false              Override     public Cursor query Uri arg0  String   arg1  String arg2  String   arg3                          String arg4               TODO Auto-generated method stub         return null              Override     public int update Uri arg0  ContentValues arg1  String arg2  String   arg3               TODO Auto-generated method stub         return 0             In manifest file make as entry for provider and test activity as    lt provider     android name  ankit TagProvider      android authorities  ankit testactivity    gt    lt activity android name   TestActivity      android label     string app name  gt       lt intent-filter  gt           lt action android name  android intent action VIEW    gt           lt category android name  android intent category DEFAULT    gt           lt data android mimeType  vnd android cursor item vnd cc tag    gt       lt  intent-filter gt   lt  activity gt    Now when you click on  facebook  it will invoke testactivtiy  And in test activity you can get the data as   Uri uri   getIntent   getData

User · Answer

Here is a more generic solution based on  Arun answer  public abstract class TextViewLinkHandler extends LinkMovementMethod        public boolean onTouchEvent TextView widget  Spannable buffer  MotionEvent event            if  event getAction      MotionEvent ACTION UP              return super onTouchEvent widget  buffer  event            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            URLSpan   link   buffer getSpans off  off  URLSpan class           if  link length    0                onLinkClick link 0  getURL                       return true             abstract public void onLinkClick String url       To use it just implement onLinkClick of TextViewLinkHandler class  For instance       textView setMovementMethod new TextViewLinkHandler              Override         public void onLinkClick String url                Toast makeText textView getContext    url  Toast LENGTH SHORT  show

User · Answer

This answer extends Jonathan S s excellent solution   You can use the following method to extract links from the text   private static ArrayList lt String gt  getLinksFromText String text            ArrayList links   new ArrayList             String regex        b  http https    www     -A-Za-z0-9  amp                    -A-Za-z0-9  amp                       Pattern p   Pattern compile regex           Matcher m   p matcher text           while  m find                  String urlStr   m group                if  urlStr startsWith       amp  amp  urlStr endsWith                         urlStr   urlStr substring 1  urlStr length   - 1                             links add urlStr                     return links          This can be used to remove one of the parameters in the clickify   method   public static void clickify TextView view                                  final ClickSpan OnClickListener listener             CharSequence text   view getText            String string   text toString              ArrayList lt String gt  linksInText   getLinksFromText string           if  linksInText isEmpty                 return                      String clickableText   linksInText get 0           ClickSpan span   new ClickSpan listener clickableText            int start   string indexOf clickableText           int end   start   clickableText length            if  start    -1  return           if  text instanceof Spannable                  Spannable  text  setSpan span  start  end  Spanned SPAN EXCLUSIVE EXCLUSIVE             else               SpannableString s   SpannableString valueOf text               s setSpan span  start  end  Spanned SPAN EXCLUSIVE EXCLUSIVE               view setText s                      MovementMethod m   view getMovementMethod            if   m    null       m instanceof LinkMovementMethod                 view setMovementMethod LinkMovementMethod getInstance                       A few changes to the ClickSpan   public static class ClickSpan extends ClickableSpan            private String mClickableText          private OnClickListener mListener           public ClickSpan OnClickListener listener  String clickableText                mListener   listener              mClickableText   clickableText                      Override         public void onClick View widget                if  mListener    null  mListener onClick mClickableText                      public interface OnClickListener               void onClick String clickableText                     Now you can simply set the text on the TextView and then add a listener to it   TextViewUtils clickify textWithLink new TextUtils ClickSpan OnClickListener      Override public void onClick String clickableText       action

User · Answer

Another way  borrows a bit from Linkify but allows you to customize your handling   Custom Span Class   public class ClickSpan extends ClickableSpan        private OnClickListener mListener       public ClickSpan OnClickListener listener            mListener   listener              Override     public void onClick View widget           if  mListener    null  mListener onClick               public interface OnClickListener           void onClick              Helper function   public static void clickify TextView view  final String clickableText       final ClickSpan OnClickListener listener         CharSequence text   view getText        String string   text toString        ClickSpan span   new ClickSpan listener        int start   string indexOf clickableText       int end   start   clickableText length        if  start    -1  return       if  text instanceof Spannable              Spannable text  setSpan span  start  end  Spanned SPAN EXCLUSIVE EXCLUSIVE         else           SpannableString s   SpannableString valueOf text           s setSpan span  start  end  Spanned SPAN EXCLUSIVE EXCLUSIVE           view setText s              MovementMethod m   view getMovementMethod        if   m    null       m instanceof LinkMovementMethod             view setMovementMethod LinkMovementMethod getInstance               Usage    clickify textView  clickText new ClickSpan OnClickListener                   Override         public void onClick                    do something

[android] handle textview link click in my android app

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