使用静态布局绘制文本，使用画布在android中特定矩形之外绘制文本

Question

我想在特定大小的矩形中绘制文本，但是得到的结果并不令人满意。

这是我到目前为止尝试过的代码：

@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    mCanvas = canvas;
    parentRect = new Rect();
    mCanvas.getClipBounds(parentRect);
    maxLeft = parentRect.left;
    maxTop = parentRect.top;
    maxRight = parentRect.right;
    maxBottom = parentRect.bottom;

    // custom drawing code here
    paint = new Paint();
    paint.setStyle(Paint.Style.FILL);

    // make the entire canvas white
    paint.setColor(Color.GRAY);
    canvas.drawPaint(paint);

    String txt = getContext().getString(R.string.txt_graphics_rotation);
    paint.setStyle(Paint.Style.FILL);
    paint.setColor(Color.BLACK);
    paint.setTextSize(50);
    paint.setTextAlign(Paint.Align.CENTER);

    canvas.save();
    canvas.translate(mPosX, mPosY);
    canvas.scale(scaleFactor, scaleFactor);

    rect = new Rect();
    paint.getTextBounds(txt, 0, txt.length(), rect);
    paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_OVER));

    Log.e(TAG, "onDraw: rect : " + rect.left + " : " + rect.top + " : " + rect.right + " : " + rect.bottom);
    Paint paint1 = new Paint();
    paint1.setColor(Color.BLUE);
    paint1.setStrokeWidth(5);
    paint1.setStyle(Paint.Style.STROKE);
    canvas.save();

    TextPaint textPaint = new TextPaint();
    textPaint.set(paint);

    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
        StaticLayout staticLayout = StaticLayout.Builder
                .obtain(txt, 0, txt.length(), textPaint, parentRect.width())
                .setBreakStrategy(Layout.BREAK_STRATEGY_BALANCED)
                .setAlignment(Layout.Alignment.ALIGN_NORMAL)
                .setIncludePad(true)
                .build();
        if (staticLayout.getLineCount() == 1) {
            widthOfText = textPaint.measureText(txt);
            heightOfText = -textPaint.ascent() + textPaint.descent();
        } else {
            widthOfText = staticLayout.getWidth();
            heightOfText = (staticLayout.getHeight());
        }

        canvas.translate(widthOfText / 2, heightOfText / 2);
        staticLayout.draw(canvas);
        canvas.drawRect(0, 0, widthOfText, heightOfText, paint1);
        canvas.restore();
    } else {
        canvas.drawText(txt, rect.left, rect.top / 2, paint);
        widthOfText = paint.measureText(txt) / 2;
        heightOfText = rect.height();
        canvas.restore();
    }
}

我在这里将矩形和文本放置在不同的位置，但是我想将它们合并。

注意：我知道我没有遵循最佳实践，请暂时忽略它。