Android 实现clickspan显示及点击效果

在很多社交应用中需要实现类似新浪微博的@某某某的文本显示及点击效果。
如下图

下面来说下具体的实现步骤。

设置颜色及处理点击事件

设置颜色及点击事件处理需要自定义clickspan，代码如下：

public class WeiBoContentClickableSpan extends ClickableSpan {private Context mContext;public WeiBoContentClickableSpan(Context context) {    mContext = context;}@Overridepublic void onClick(View widget) {}@Overridepublic void updateDrawState(TextPaint ds) {    super.updateDrawState(ds);    ds.setColor(0xff507daf);    ds.setUnderlineText(false);}}

设置点击效果

实现点击效果需要自定义LinkMovementMethod类，代码如下：

/  * Created by pkhope on 2016/6/16. */public class MyLinkMovementMethod extends LinkMovementMethod {    private static LinkMovementMethod sInstance;    public static MovementMethod getInstance() {        if (sInstance == null)            sInstance = new MyLinkMovementMethod();        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 ||                action == MotionEvent.ACTION_MOVE) {            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) {                if (action == MotionEvent.ACTION_UP) {                    link[0].onClick(widget);                    buffer.setSpan(new BackgroundColorSpan(Color.TRANSPARENT),                            buffer.getSpanStart(link[0]), buffer.getSpanEnd(link[0]),                            Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);                    Selection.removeSelection(buffer);                } else if (action == MotionEvent.ACTION_DOWN) {                    buffer.setSpan(new BackgroundColorSpan(Color.GRAY),                            buffer.getSpanStart(link[0]), buffer.getSpanEnd(link[0]),                            Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);                    Selection.setSelection(buffer,                            buffer.getSpanStart(link[0]),                            buffer.getSpanEnd(link[0]));                } else if (action == MotionEvent.ACTION_MOVE){                    buffer.setSpan(new BackgroundColorSpan(Color.TRANSPARENT),                            buffer.getSpanStart(link[0]), buffer.getSpanEnd(link[0]),                            Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);                    Selection.removeSelection(buffer);                }                return true;            } else {                Selection.removeSelection(buffer);            }        }//        return super.onTouchEvent(widget, buffer, event);        return false;    }}

总结

设置点击效果的关键点是处理点击后背景色不消失的问题。
具体代码可以参考项目 https://github.com/pkhope/weibo

关键字：android, tspa, link, int

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