Android Span在项目中的几种使用方式

/\*\*

 \* 自定义颜色

 \*

 \* @param content 全部文本

 \* @param keyWord 需要变色的关键字

 \* @param color   颜色

 \*/

public static SpannableStringBuilder getSpan(String content, String keyWord, int color) {

    SpannableStringBuilder span = null;

    if (content == null) {

        span = new SpannableStringBuilder("");

        return span;

    } else {

        int startIndex = 0;

        int endIndex = 0;

        if (keyWord != null) {

            startIndex = content.indexOf(keyWord);

            endIndex = content.indexOf(keyWord) + keyWord.length();

            span = new SpannableStringBuilder(content);

            if (startIndex != -1 && startIndex <= endIndex) {

                span.setSpan(new ForegroundColorSpan(getResoure().getColor(color)), startIndex, endIndex, Spannable.SPAN\_EXCLUSIVE\_EXCLUSIVE);

            }

        }

        return span;

    }

}

/\*\*

 \* 设置单个字符串的文字大小

 \*

 \* @param content 全部文字

 \* @param keyWord 需要改变的文本

 \* @param spValue 需要设置的文本大小

 \*/

public static SpannableStringBuilder getSizeSpan(String content, String keyWord, float spValue) {

    SpannableStringBuilder span = null;

    if (TextUtils.isEmpty(content)) {

        span = new SpannableStringBuilder("");

        return span;

    } else {

        int startIndex = 0;

        int endIndex = 0;

        if (keyWord != null) {

            startIndex = content.indexOf(keyWord);

            endIndex = content.indexOf(keyWord) + keyWord.length();

            span = new SpannableStringBuilder(content);

            if (startIndex != -1 && startIndex <= endIndex) {

                float px = DensityAppUtil.sp2px(spValue);

                span.setSpan(new AbsoluteSizeSpan((int) px), startIndex, endIndex, Spannable.SPAN\_EXCLUSIVE\_EXCLUSIVE);

            }

        }

        return span;

    }

}

public class ButtonSpan extends ClickableSpan {



    View.OnClickListener onClickListener;

    private Context context;

    private int colorId;



    public ButtonSpan(Context context, View.OnClickListener onClickListener) {

        this(context, onClickListener, R.color.color\_theme);

    }



    public ButtonSpan(Context context, View.OnClickListener onClickListener, int colorId) {

        this.onClickListener = onClickListener;

        this.context = context;

        this.colorId = colorId;

    }



    @Override

    public void updateDrawState(TextPaint ds) {

        ds.setColor(context.getResources().getColor(colorId));

        ds.setUnderlineText(false);

    }



    @Override

    public void onClick(View widget) {

        if (onClickListener != null) {

            onClickListener.onClick(widget);

        }

    }

}

// content为全部的字符串，keyWord为需要改变的字符串

SpannableString spannableString = new SpannableString(content);

ButtonSpan span = new ButtonSpan(v.getContext(), new View.OnClickListener() {

    @Override

    public void onClick(View v) {

        // do something..

        }

    }

}, R.color.color\_theme);

spannableString.setSpan(span, content.indexOf(keyWord), content.indexOf(keyWord + keyWord.length(), Spanned.SPAN\_EXCLUSIVE\_EXCLUSIVE);

//不设置 没有点击事件

titleTop.setMovementMethod(LinkMovementMethod.getInstance());

//设置点击后的颜色为透明

titleTop.setHighlightColor(Color.TRANSPARENT);

titleTop.setText(spannableString);

public class TagSpan extends ReplacementSpan {



    // span width

    private int mSize;

    // text and background wireframe colo

    private int mColor;

    // tag text size

    private int mTextSizePx;

    // background radius

    private int mRadiusPx;

    // background wireframe right margin

    private int mRightMarginPx;



    public TagSpan(int color, int textSizePx, int radiusPx, int rightMarginPx) {

        mColor = color;

        mTextSizePx = textSizePx;

        mRadiusPx = radiusPx;

        mRightMarginPx = rightMarginPx;

    }



    @Override

    public int getSize(@NonNull Paint paint, CharSequence text, int start, int end, Paint.FontMetricsInt fm) {

        mSize = (int) paint.measureText(text, start, end) + mRightMarginPx;

        return mSize;

    }



    @Override

    public void draw(@NonNull Canvas canvas, CharSequence text, int start, int end, float x, int top, int y, int bottom, Paint paint) {

        drawTagRect(canvas, x, y, paint);

        drawTagText(canvas, text, start, end, y, paint);

    }



    private void drawTagRect(Canvas canvas, float x, int y, Paint paint) {

        paint.setColor(mColor);

        paint.setAntiAlias(true);



        Paint.FontMetricsInt fontMetrics = paint.getFontMetricsInt();

        final float strokeWidth = paint.getStrokeWidth();

        RectF oval = new RectF(x + strokeWidth + 0.5f, y + fontMetrics.ascent, x + mSize + strokeWidth + 0.5f - mRightMarginPx, y + fontMetrics.descent);

        paint.setStyle(Paint.Style.STROKE);

        canvas.drawRoundRect(oval, mRadiusPx, mRadiusPx, paint);

    }



    private void drawTagText(Canvas canvas, CharSequence text, int start, int end, int y, Paint paint) {

        paint.setTextSize(mTextSizePx);

        paint.setColor(mColor);

        paint.setAntiAlias(true);

        paint.setTextAlign(Paint.Align.CENTER);



        Paint.FontMetrics fontMetrics = paint.getFontMetrics();

        final int textCenterX = (mSize - mRightMarginPx / 2) / 2;

        int textBaselineY = (int) (y - fontMetrics.descent / 2);

        final String tag = text.subSequence(start, end).toString();

        canvas.drawText(tag, textCenterX, textBaselineY, paint);

    }

}

/\*\*

 \* 增加边框和改变颜色及字体大小

 \*

 \* @param content 内容

 \* @param keyWord 关键字

 \* @param color   颜色

 \* @param sp      字体sp，需转换为对应的px

 \*/

public static SpannableStringBuilder getSpan(String content, String keyWord, int color, int sp) {

    SpannableStringBuilder span = null;

    if (content == null) {

        span = new SpannableStringBuilder("");

        return span;

    } else {

        int startIndex = 0;

        int endIndex = 0;



        if (!TextUtils.isEmpty(keyWord)) {

            startIndex = content.indexOf(keyWord);

            endIndex = content.indexOf(keyWord) + keyWord.length();

            span = new SpannableStringBuilder(content);

            if (startIndex != -1 && startIndex <= endIndex) {

                // 圆角 右边距

                span.setSpan(new TagSpan(color, (int) sp, 4, 8), startIndex, endIndex, Spannable.SPAN\_EXCLUSIVE\_EXCLUSIVE);

            }

        }

        return span;

    }

}