自定义带背景的Spannable

Android

内容较老，仅提供思路

import android.content.res.Resources;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.Typeface;
import android.graphics.drawable.Drawable;
import android.support.annotation.NonNull;
import android.support.v4.content.res.ResourcesCompat;
import android.text.style.ImageSpan;
import com.imlib.common.utils.IMUtils;
import net.appcloudbox.uniform.HSApplication;
public class CenterAlignSpanWithNum extends ImageSpan {
    private int resId;
    public CenterAlignSpanWithNum(@NonNull Drawable d, int resId) {
        super(d);
        this.resId = resId;
    }
    @Override
    public void draw(@NonNull Canvas canvas, CharSequence text, int start, int end, float x, int top, int y, int bottom, @NonNull Paint paint) {
        Drawable background = getDrawable();
        Rect bounds = background.getBounds();
        Paint.FontMetricsInt fm = paint.getFontMetricsInt();
        int transY = (y + fm.descent + y + fm.ascent) / 2 - bounds.bottom / 2;//计算y方向的位移
        canvas.save();
        canvas.translate(x, transY);//绘制图片位移一段距离
        background.draw(canvas);
        canvas.restore();
        String str = text.subSequence(start, end).toString();
        paint.setTextSize(IMUtils.dip2px(13));
        Rect textBounds = new Rect();
        //获得字符串所占空间大小
        paint.getTextBounds(str, 0, str.length(), textBounds);
        paint.setColor(Color.parseColor("#121212"));
        Typeface tf = null;
        try {
            tf = ResourcesCompat.getFont(HSApplication.getContext(), resId);
        } catch (Resources.NotFoundException e) {
            e.printStackTrace();
        }
        if (null == tf) {
            tf = Typeface.create("sans-serif_medium", Typeface.NORMAL);
            paint.setFakeBoldText(true); // semi-bold要比bold细一点
        }
        paint.setTypeface(tf);
        float textX = x + bounds.width() / 2f - textBounds.width() / 2f + IMUtils.dip2px(2);
        canvas.drawText(str, textX, (float) y, paint);
    }
}