TagTextView 行内标签TextView

效果

效果如下，可以解析xml中配置的drawableStart ，然后将这个drawable显示在一行内。下一个开始。从这个drawable开始。

代码

MaxLengthTextView 是我另外一个自定义view MaxLengthTextView 如果内容超过xml中maxLength属性定义的文字数量时，会被添加省略号

package com.trs.v7.home.toutiao_v2.provider.rdwz;

import static android.text.Spanned.SPAN_INCLUSIVE_EXCLUSIVE;

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.text.SpannableString;
import android.text.style.ImageSpan;
import android.util.AttributeSet;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;

import com.trs.nmip.common.ui.news.list.view.MaxLengthTextView;


/**
 * <pre>
 * Created by zhuguohui
 * Date: 2024/1/9
 * Time: 10:39
 * Desc:这个类的作用是将在xml中配置的drawableStart
 * 对应的drawable 显示在一行里面。
 * </pre>
 */
public class TagTextView extends MaxLengthTextView {


    private Drawable leftDrawable;

    public TagTextView(@NonNull Context context) {
        super(context);
    }

    @SuppressLint("UseCompatLoadingForDrawables")
    public TagTextView(@NonNull Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        leftDrawable = null;
        if(attrs!=null) {
            int resourceValue = attrs.getAttributeResourceValue("http://schemas.android.com/apk/res/android",
                    "drawableStart", -1);
            if(resourceValue!=-1){
                leftDrawable=getResources().getDrawable(resourceValue);
            }
            //重置
            setCompoundDrawables(null, null, null, null);
        }

    }


    @Override
    public void setText(CharSequence text, BufferType type) {


        super.setText(getTextWithLeftIcon(text, leftDrawable), type);
    }

    private static CharSequence getTextWithLeftIcon(CharSequence text, Drawable icon) {

        if (icon == null) {
            return text;
        }

        icon.setBounds(0, 0, icon.getIntrinsicWidth(), icon.getIntrinsicHeight());
        Bitmap bitmap = Bitmap.createBitmap(icon.getIntrinsicWidth(), icon.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        icon.draw(canvas);
        //获取View的截图，用来当Tag图标

        //将图片设置到TextView中
        BitmapDrawable bitmapDrawable = new BitmapDrawable(bitmap);
        bitmapDrawable.setBounds(0, 0, bitmap.getWidth(), bitmap.getHeight());
        SpannableString spannableString = new SpannableString("icon" + text);
        MyIm imageSpan = new MyIm(bitmapDrawable);
        spannableString.setSpan(imageSpan, 0, "icon".length(), SPAN_INCLUSIVE_EXCLUSIVE);
        return spannableString;
    }


    /**
     * 可以居中对齐的ImageSPan
     */
    public static class MyIm extends ImageSpan {
        public MyIm(Context arg0, int arg1) {
            super(arg0, arg1);
        }

        public MyIm(Drawable drawable) {
            super(drawable);
        }

        public int getSize(Paint paint, CharSequence text, int start, int end,
                           Paint.FontMetricsInt fm) {
            Drawable d = getDrawable();
            Rect rect = d.getBounds();
            if (fm != null) {
                Paint.FontMetricsInt fmPaint = paint.getFontMetricsInt();
                int fontHeight = fmPaint.bottom - fmPaint.top;
                int drHeight = ((Rect) rect).bottom - rect.top;

                int top = drHeight / 2 - fontHeight / 4;
                int bottom = drHeight / 2 + fontHeight / 4;

                fm.ascent = -bottom;
                fm.top = -bottom;
                fm.bottom = top;
                fm.descent = top;
            }
            //15为padding
            return rect.right + 15;
        }

        @Override
        public void draw(Canvas canvas, CharSequence text, int start, int end,
                         float x, int top, int y, int bottom, Paint paint) {
            Drawable b = getDrawable();
            canvas.save();
            int transY = 0;
            transY = ((bottom - top) - b.getBounds().bottom) / 2 + top;
            canvas.translate(x, transY);
            b.draw(canvas);
            canvas.restore();
        }
    }

}