带有可点击链接的Android TextView:如何捕获点击次数？

Question

我有一个TextView,它呈现基本HTML,包含2个以上的链接.我需要捕获链接上的点击并打开链接 - 在我自己的内部WebView中(不在默认浏览器中).

处理链接呈现的最常用方法似乎是这样的:

String str_links = "<a href='http://google.com'>Google</a><br /><a href='http://facebook.com'>Facebook</a>";
text_view.setLinksClickable(true);
text_view.setMovementMethod(LinkMovementMethod.getInstance());
text_view.setText( Html.fromHtml( str_links ) );

但是,这会导致链接在默认的内部Web浏览器中打开(显示"使用完整操作..."对话框).

我尝试实现一个onClickListener,当单击链接时正确触发,但我不知道如何确定单击了哪个链接...

text_view.setOnClickListener(new OnClickListener(){

    public void onClick(View v) {
        // what now...?
    }

});

或者,我尝试创建自定义LinkMovementMethod类并实现onTouchEvent ...

public boolean onTouchEvent(TextView widget, Spannable text, MotionEvent event) {
    String url = text.toString();
    // this doesn't work because the text is not necessarily a URL, or even a single link... 
    // eg, I don't know how to extract the clicked link from the greater paragraph of text
    return false;
}

想法？

---

示例解决方案

我想出了一个解决方案,它解析HTML字符串中的链接并使它们可以点击,然后让你回复URL.

Answer 1

基于另一个答案,这里是一个函数setTextViewHTML(),它解析HTML字符串中的链接并使它们可单击,然后让您响应URL.

protected void makeLinkClickable(SpannableStringBuilder strBuilder, final URLSpan span)
{
    int start = strBuilder.getSpanStart(span);
    int end = strBuilder.getSpanEnd(span);
    int flags = strBuilder.getSpanFlags(span);
    ClickableSpan clickable = new ClickableSpan() {
        public void onClick(View view) {
            // Do something with span.getURL() to handle the link click...
        }
    };
    strBuilder.setSpan(clickable, start, end, flags);
    strBuilder.removeSpan(span);
}

protected void setTextViewHTML(TextView text, String html)
{
    CharSequence sequence = Html.fromHtml(html);
    SpannableStringBuilder strBuilder = new SpannableStringBuilder(sequence);
    URLSpan[] urls = strBuilder.getSpans(0, sequence.length(), URLSpan.class);   
    for(URLSpan span : urls) {
        makeLinkClickable(strBuilder, span);
    }
    text.setText(strBuilder);
    text.setMovementMethod(LinkMovementMethod.getInstance());       
}

Answer 2

我在Kotlin 中创建了一个简单的扩展函数，通过对 URLSpan 元素应用新的回调来捕获 TextView 中的 url 链接点击。

strings.xml（文本中的示例链接）

<string name="link_string">this is my link: <a href="https://www.google.com/">CLICK</a></string>

在调用“handleUrlClicks”之前，请确保将跨区文本设置为 TextView

textView.text = getString(R.string.link_string)

这是扩展功能：

/**
 * Searches for all URLSpans in current text replaces them with our own ClickableSpans
 * forwards clicks to provided function.
 */
fun TextView.handleUrlClicks(onClicked: ((String) -> Unit)? = null) {
    //create span builder and replaces current text with it
    text = SpannableStringBuilder.valueOf(text).apply {
        //search for all URL spans and replace all spans with our own clickable spans
        getSpans(0, length, URLSpan::class.java).forEach {
            //add new clickable span at the same position
            setSpan(
                object : ClickableSpan() {
                    override fun onClick(widget: View) {
                        onClicked?.invoke(it.url)
                    }
                },
                getSpanStart(it),
                getSpanEnd(it),
                Spanned.SPAN_INCLUSIVE_EXCLUSIVE
            )
            //remove old URLSpan
            removeSpan(it)
        }
    }
    //make sure movement method is set
    movementMethod = LinkMovementMethod.getInstance()
}

我是这样称呼它的：

textView.handleUrlClicks { url ->
    Timber.d("click on found span: $url")
}

Answer 3

你做了如下:

text_view.setMovementMethod(LinkMovementMethod.getInstance());
text_view.setText( Html.fromHtml( str_links ) );

你按照下面的顺序尝试了相反的顺序吗？

text_view.setText( Html.fromHtml( str_links ) );
text_view.setMovementMethod(LinkMovementMethod.getInstance());

没有:

text_view.setLinksClickable(true);

Answer 4

这可以通过使用Spannable String简单地解决.你真正想做的事情(业务要求)对我来说有点不清楚,所以下面的代码不会给出你的情况的确切答案,但我很小心它会给你一些想法和您将能够根据以下代码解决您的问题.

正如你所做的那样,我也通过HTTP响应得到了一些数据,我在我的案例中添加了一些额外的带下划线的文本"more",这个带下划线的文本将在click事件上打开Web浏览器.希望这对你有帮助.

TextView decription = (TextView)convertView.findViewById(R.id.library_rss_expan_chaild_des_textView);
String dec=d.get_description()+"<a href='"+d.get_link()+"'><u>more</u></a>";
CharSequence sequence = Html.fromHtml(dec);
SpannableStringBuilder strBuilder = new SpannableStringBuilder(sequence);
UnderlineSpan[] underlines = strBuilder.getSpans(0, 10, UnderlineSpan.class);   
for(UnderlineSpan span : underlines) {
    int start = strBuilder.getSpanStart(span);
    int end = strBuilder.getSpanEnd(span);
    int flags = strBuilder.getSpanFlags(span);
    ClickableSpan myActivityLauncher = new ClickableSpan() {
        public void onClick(View view) {
            Log.e(TAG, "on click");
            Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(d.get_link()));
            mContext.startActivity(intent);         
        }
    };
    strBuilder.setSpan(myActivityLauncher, start, end, flags);
}
decription.setText(strBuilder);
decription.setLinksClickable(true);
decription.setMovementMethod(LinkMovementMethod.getInstance());

Answer 5

我遇到了同样的问题,但很多文字混合了很少的链接和电子邮件.我认为使用'autoLink'是一种更简单,更清洁的方法:

  text_view.setText( Html.fromHtml( str_links ) );
  text_view.setLinksClickable(true);
  text_view.setAutoLinkMask(Linkify.ALL); //to open links

如果只想使用其中一个或从XML布局设置,可以设置Linkify.EMAIL_ADDRESSES或Linkify.WEB_URLS

  android:linksClickable="true"
  android:autoLink="web|email"

可用选项包括:无,网络,电子邮件,电话,地图,全部

Answer 6

一种更清洁,更好的解决方案,使用原生的Linkify库.

例:

Linkify.addLinks(mTextView, Linkify.ALL);

Answer 7

解

我已经实现了一个小类,您可以通过它帮助长按TextView本身并点击TextView中的链接.

布局

TextView android:id="@+id/text"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:autoLink="all"/>

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, "----> Long Click Occurs on TextView with ID: " + mWidget.getId() + "\n" +
                                  "Text: " + text + "\n<----");

                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, "----> Tap Occurs on TextView with ID: " + mWidget.getId() + "\n" +
                                  "Link Text: " + linkText + "\n" +
                                  "Link Type: " + linkType + "\n<----");

                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 "";
        }
    }
}

用法

String str_links = "<a href='http://google.com'>Google</a><br /><a href='http://facebook.com'>Facebook</a>";
text_view.setText( Html.fromHtml( str_links ) );
text_view.setMovementMethod(new TextViewClickMovement(this, context));

链接

希望这有助于此!你可以在这里找到代码.

Answer 8

如果您使用的是 Kotlin，我为这种情况编写了一个简单的扩展：

/**
 * Enables click support for a TextView from a [fullText] String, which one containing one or multiple URLs.
 * The [callback] will be called when a click is triggered.
 */
fun TextView.setTextWithLinkSupport(
    fullText: String,
    callback: (String) -> Unit
) {
    val spannable = SpannableString(fullText)
    val matcher = Patterns.WEB_URL.matcher(spannable)
    while (matcher.find()) {
        val url = spannable.toString().substring(matcher.start(), matcher.end())
        val urlSpan = object : URLSpan(fullText) {
            override fun onClick(widget: View) {
                callback(url)
            }
        }
        spannable.setSpan(urlSpan, matcher.start(), matcher.end(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE)
    }
    text = spannable
    movementMethod = LinkMovementMethod.getInstance() // Make link clickable
}

用法：

yourTextView.setTextWithLinkSupport("click on me: https://www.google.fr") {
   Log.e("URL is $it")
}