TextView自定义换行

强制字符占满一行才换行，避免TextView中英混合过早换行，并且在最后添加点击文字

public class TextViewLineFeed extends TextView {    private float textX;    private float textY;    private int clickStart;    private ClickTextListner clickTextListner;    private float clickTextWidth;    protected void onDraw(Canvas canvas) {//        使用默认画笔        getPaint().setColor(getCurrentTextColor());        getPaint().setUnderlineText(false);//        获取文字内容        String text = getText().toString();//        获取每个字符宽        float[] charWidths = new float[text.length()];        getPaint().getTextWidths(text, charWidths);//        点击文字宽        for (int i = clickStart; i < charWidths.length; i++)            clickTextWidth += charWidths[i];//        循环换行输出        textLineFeed(canvas, text, charWidths);    }    /**     * 换行，并在最后添加点击文字     */    private void textLineFeed(Canvas canvas, String text, float[] charWidths) {//        第一行文字基线Y坐标        textY = getTextSize();        for (int start = 0, end = 0, strLineLen = 0; end < charWidths.length; ++end) {//            文本宽超过View宽，换行输出            if ((strLineLen += charWidths[end]) > getWidth()) {                if (end - 1 < clickStart) {                    canvas.drawText(text.substring(start, end), 0, textY, getPaint());                } else {                    canvas.drawText(text.substring(start, clickStart), 0, textY, getPaint());//                    避免点击文字中间换行，强制把点击文字换行输出                    getPaint().setColor(0xff0000ff);                    getPaint().setUnderlineText(true);                    canvas.drawText(text.substring(clickStart, charWidths.length), (textX = 0), (textY = textY + getLineHeight()), getPaint());                    break;                }                strLineLen = 0;                start = end;                textY += getLineHeight();            }//            文本结束且不超过View宽，不换行输出            if (end == charWidths.length - 1) {                canvas.drawText(text.substring(start, clickStart), 0, textY, getPaint());                textX = 0;                for (int i = start; i < clickStart; i++)                    textX += charWidths[i];                getPaint().setColor(0xff0000ff);                getPaint().setUnderlineText(true);                canvas.drawText(text.substring(clickStart, ++end), textX, textY, getPaint());            }        }    }    @Override    public boolean onTouchEvent(MotionEvent event) {        switch (event.getAction()) {            case MotionEvent.ACTION_DOWN:                if (event.getX() > textX &&                        event.getX() < (textX + clickTextWidth) &&                        event.getY() > (textY - getLineHeight()))                    clickTextListner.clickText();                break;        }        return super.onTouchEvent(event);    }    /**     * 在文字最后附加点击功能     * @param start 点击文字的起始位置     */    public void setClickText(int start) {        clickStart = start;    }    public interface ClickTextListner {        public void clickText();    }    public void setClickTextListner(ClickTextListner click) {        clickTextListner = click;    }    public TextViewLineFeed(Context context) {        this(context, null);    }    public TextViewLineFeed(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public TextViewLineFeed(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);    }}

GitHub博客：http://lioil.win/2016/11/17/TextView-LineFeed.html
Coding博客：http://c.lioil.win/2016/11/17/TextView-LineFeed.html