[android篇]textview中片断响应点击事件(SpannableString)

• 项目需求

点击textView中的一小段文字，弹一个dialog框

• 失败解决方案

刚开始是用了两个textView水平布局，可想而知，当第一个textView快占满一行，还未换行时，第二个textView很可能出现换行排版问题

• 用spannableString的问题

小段文字有下划线

点击textView中的小段文字时，系统会当做url处理，给点击部分的text加一个蓝色的背景

• 解决方案

public class TouchableSpan extends ClickableSpan {	    private boolean mIsPressed;	    private int mPressedBackgroundColor;	    private int mNormalTextColor;	    private int mPressedTextColor;	    public TouchableSpan(int normalTextColor, int pressedTextColor, int pressedBackgroundColor) {	        mNormalTextColor = normalTextColor;	        mPressedTextColor = pressedTextColor;	        mPressedBackgroundColor = pressedBackgroundColor;	    }	    public void setPressed(boolean isSelected) {	        mIsPressed = isSelected;	    }	    @Override	    public void updateDrawState(TextPaint ds) {	        super.updateDrawState(ds);	        ds.setColor(mIsPressed ? mPressedTextColor : mNormalTextColor);	        ds.bgColor = mIsPressed ? mPressedBackgroundColor : 0x00eeeeee;	        ds.setUnderlineText(false);	    }		@Override		public void onClick(View widget) {			//todo		}	}

class LinkTouchMovementMethod extends LinkMovementMethod {	    private TouchableSpan mPressedSpan;	    @Override	    public boolean onTouchEvent(TextView textView, Spannable spannable, MotionEvent event) {	        if (event.getAction() == MotionEvent.ACTION_DOWN) {	            mPressedSpan = getPressedSpan(textView, spannable, event);	            if (mPressedSpan != null) {	                mPressedSpan.setPressed(true);	                Selection.setSelection(spannable, spannable.getSpanStart(mPressedSpan),	                        spannable.getSpanEnd(mPressedSpan));	            }	        } else if (event.getAction() == MotionEvent.ACTION_MOVE) {	            TouchableSpan touchedSpan = getPressedSpan(textView, spannable, event);	            if (mPressedSpan != null && touchedSpan != mPressedSpan) {	                mPressedSpan.setPressed(false);	                mPressedSpan = null;	                Selection.removeSelection(spannable);	            }	        } else {	            if (mPressedSpan != null) {	                mPressedSpan.setPressed(false);	                super.onTouchEvent(textView, spannable, event);	            }	            mPressedSpan = null;	            Selection.removeSelection(spannable);	        }	        return true;	    }	    TouchableSpan getPressedSpan(TextView textView, Spannable spannable, MotionEvent event) {	        int x = (int) event.getX();	        int y = (int) event.getY();	        x -= textView.getTotalPaddingLeft();	        y -= textView.getTotalPaddingTop();	        x += textView.getScrollX();	        y += textView.getScrollY();	        Layout layout = textView.getLayout();	        int line = layout.getLineForVertical(y);	        int off = layout.getOffsetForHorizontal(line, x);	        TouchableSpan[] link = spannable.getSpans(off, off, TouchableSpan.class);	        TouchableSpan touchedSpan = null;	        if (link.length > 0) {	            touchedSpan = link[0];	        }	        return touchedSpan;	    }	}

mStartPageTermsCondition.setMovementMethod(new LinkTouchMovementMethod());