java - 如何用多行文本覆盖图像(文本将位于 Canvas 的中心)

Question

我正在开发摄影应用程序，因为我会在图像上叠加文字。

这是我的代码:

Bitmap mBitmap = BitmapFactory.decodeResource(getResources(),
        R.drawable.themes11);
// create a mutable bitmap with the same size as the background image's size
bmOverlay = Bitmap.createBitmap(mBitmap.getWidth(),
        mBitmap.getHeight(), Bitmap.Config.ARGB_4444);
// create a canvas on which to draw
Canvas canvas = new Canvas(bmOverlay);
TextPaint paint = new TextPaint();
paint.setColor(Color.RED);

paint.setTextSize(40);
paint.setFlags(Paint.ANTI_ALIAS_FLAG);
// if the background image is defined in main.xml, omit this line
canvas.drawBitmap(mBitmap, 0, 0, null);

// draw the text and the point
canvas.drawPoint(50, 100, paint);
// canvas.drawText(InstaTextActivity.CurrentWord, 300, 200, paint);
StaticLayout layout = new StaticLayout(InstaTextActivity.CurrentWord,
        paint, display.getHeight(),
        android.text.Layout.Alignment.ALIGN_NORMAL, (float) 1.0,
        (float) 0.0, true);

canvas.translate(width / 5, height / 5);
layout.draw(canvas);
imageview_img.setImageBitmap(bmOverlay);

在此代码中，我将文本覆盖在屏幕宽度/2 和高度/2 上，它将显示在图像顶部，但我希望文本居中对齐。此外，当我写一个大文本时，它会将表格中心向右对齐。

看看图片，了解我想要的效果:

图片背景:

我想要的结果:

Answer 1

使用以下方法测量文本的高度和宽度。然后在canvas上绘制文字的时候

left = width/2 - textWidth/2
top = height/2 - textHeight/2

但是如果长文本需要多行文本，那就有点棘手了。

/**
 * Method to get the height of the paint
 * 
 * @param brush The TextPaint used to paint the text
 * @param text The text which needs to be measured
 * @return height of the text
 */
public static int measureTextHeight(Paint brush, String text) {
    Rect result = new Rect();
    // Measure the text rectangle to get the height
    brush.getTextBounds(text, 0, text.length(), result);
    return result.height();
}
/**
 * Method to get the width of the paint
 * 
 * @param brush The TextPaint used to paint the text
 * @param text The text which needs to be measured
 * @return width of the text
 */
public static int measureTextWidth(Paint brush, String text) {
    Rect result = new Rect();
    // Measure the text rectangle to get the height
    brush.getTextBounds(text, 0, text.length(), result);
    return result.width();
}