drawable-图片绘制

首先看一下，下端代码

private Bitmap createSelectedChip(RecipientEntry contact, TextPaint paint) {
        int height = (int) mChipHeight;
        int deleteWidth = height;
        float[] widths = new float[1];
        paint.getTextWidths(" ", widths);
        CharSequence ellipsizedText = ellipsizeText(createChipDisplayText(contact), paint,
                calculateAvailableWidth() - deleteWidth - widths[0]);
        printDebugLog(TAG,"[createSelectedChip] " + ellipsizedText);

        int width = Math.max( 0 /*deleteWidth * 2*/, (int) Math.floor(paint.measureText(ellipsizedText, 0,
                ellipsizedText.length()))
                + (mChipPadding * 2) + deleteWidth);
        /// @}
        // Create the background of the chip.

//创建一个画布，宽为width,高为height
        Bitmap tmpBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
//创建一个工具，这个工具的操作，都是在这个画布上进行的
        Canvas canvas = new Canvas(tmpBitmap);
        if (mChipBackgroundPressed != null) {
//创建一个矩形
            Rect backgroundPadding = new Rect();
            mChipBackgroundPressed.getPadding(backgroundPadding);
//获得一个图片的大小，这个应该是按比例压缩的感觉
            mChipBackgroundPressed.setBounds(0, 0, width - deleteWidth, height);
//把这个压缩以后的图片绘制到这个画布上（图过工具）
            mChipBackgroundPressed.draw(canvas);
//创建一个画笔，给他设定颜色
            paint.setColor(sSelectedTextColor);
//通过工具跟画笔，绘制一个文字
            canvas.drawText(ellipsizedText, 0, ellipsizedText.length(), mChipPadding,
                    getTextYOffset((String) ellipsizedText, paint, height), paint);
            mChipDelete.setBounds(width - deleteWidth - backgroundPadding.left,
+ backgroundPadding.top/2,
                    width - backgroundPadding.right/2,
                    height);
            mChipDelete.draw(canvas);
        } else {
            Log.w(TAG, "Unable to draw a background for the chips as it was never set");
        }
        return tmpBitmap;
    }

如

Drawable drawable = xxxx;
drawable.setBounds(int, int, int, int);
drawable.draw(canvas);

setBounds 有人给出的解释是，绘制图片时候，相对于父容器的边距

但是，通过验证，我感觉应该是如下的解释，看图