自定义View示例-04-01 TextView图文混排的

1.效果图

image.png
image.png

2.思路分析

2.1 先添加图片

2.2 再绘制文字，使用breakText来判断折行

3.具体实现

public class cmImageTextView extends View {

    //图像宽度
    private static final float IMAGE_WIDTH = DpToPxUtil.dp2px(120);

    private static final float IMAGE_OFFSET = DpToPxUtil.dp2px(50);
    private static final float IMAGE_LEFT = DpToPxUtil.dp2px(45);

    //创建画笔
    private Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
    //图像
    private Bitmap mBitmap;

    Paint.FontMetrics mFontMetrics = new Paint.FontMetrics();

    private String text = "中华五千年的历史长河中，出现了数不尽的千古风流人物，他们的事迹影响了一代又一代中华儿女。他们的名字如星光般灿烂，照耀着我们前进的步伐，激励着我们努力奋进。他们是华夏的骄傲，是中华好儿郎！中华五千年的历史长河中，出现了数不尽的千古风流人物，他们的事迹影响了一代又一代中华儿女。他们的名字如星光般灿烂，照耀着我们前进的步伐，激励着我们努力奋进。他们是华夏的骄傲，是中华好儿郎！中华五千年的历史长河中，出现了数不尽的千古风流人物，他们的事迹影响了一代又一代中华儿女。他们的名字如星光般灿烂，照耀着我们前进的步伐，激励着我们努力奋进。他们是华夏的骄傲，是中华好儿郎！";
    //文字长度
    private int length;
    private float verticalOffset;
    private float textTop;
    private float textBottom;
    private int count;
    private int countLine;
    private int maxWidth;
    private float[] cutWidth = new float[1];

    {
        mBitmap = CMBitMapUtils.getAvatarWithImage(getResources(),(int) IMAGE_WIDTH, R.drawable.sun_photo);
        mPaint.setTextSize(DpToPxUtil.dp2px(15));
        mPaint.getFontMetrics(mFontMetrics);
        length = text.length();
    }

    public cmImageTextView(Context context) {
        super(context);
    }

    public cmImageTextView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
    }

    public cmImageTextView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        //绘制图像
        canvas.drawBitmap(mBitmap,getWidth() - IMAGE_WIDTH - IMAGE_LEFT,IMAGE_OFFSET,mPaint);
        //绘制TextView
        verticalOffset = -mFontMetrics.top;
        for (int start = 0; start < length;){
            textTop = mFontMetrics.top + verticalOffset;
            textBottom = mFontMetrics.bottom + verticalOffset;

            if(textTop > IMAGE_OFFSET && textTop < (IMAGE_WIDTH + IMAGE_OFFSET) || textBottom > IMAGE_OFFSET && textBottom < (IMAGE_OFFSET + IMAGE_WIDTH)){
                //图文在同一行
                maxWidth = (int)(getWidth() - IMAGE_WIDTH);
                count = mPaint.breakText(text,start,length,true,maxWidth,cutWidth);
                //如果图片不是在图片最右边
                if(IMAGE_LEFT > 0){
                    countLine = mPaint.breakText(text,start,length,true,maxWidth - IMAGE_LEFT,cutWidth);
                    canvas.drawText(text,start,start + countLine,0,verticalOffset,mPaint);
                    canvas.drawText(text,start + countLine , start + count,maxWidth - IMAGE_LEFT + IMAGE_WIDTH,verticalOffset,mPaint);
                }else{
                    canvas.drawText(text,start,start + count,0,verticalOffset,mPaint);
                }

            }else{
                //不在同一行
                maxWidth = getWidth();
                count = mPaint.breakText(text,start,length,true,maxWidth,cutWidth);
                canvas.drawText(text,start,start + count,0,verticalOffset,mPaint);
            }
            start += count;
            verticalOffset += mPaint.getFontSpacing();
        }
    }
}

Demo：CMViewDemo Github地址