Canvas drawText 字太长使用省略号

public void drawBottomOverlay(Bitmap bitmap, String title, String duration) {        // Draw overlay at the bottom of the canvas.        final Canvas canvas = new Canvas(bitmap);        final Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);        paint.setColor(Color.BLACK);        paint.setAlpha(128);        final int left = 0, top = bitmap.getHeight() - mOverlayHeight,                right = bitmap.getWidth(), bottom = bitmap.getHeight();        canvas.drawRect(left, top, right, bottom, paint);        paint.setColor(Color.WHITE);        paint.setTextSize((int) mResources.getDimension(R.dimen.project_picker_item_font_size));        // Draw movie title at the left of the overlay. Trim title if it is going to overlap with        // duration text.        final int availableTitleWidth = bitmap.getWidth() - (int) paint.measureText(duration) - 2 * mOverlayHorizontalInset;        title = TextUtils.ellipsize(title, new TextPaint(paint), availableTitleWidth,                TextUtils.TruncateAt.END).toString();        canvas.drawText(title, mOverlayHorizontalInset,                bitmap.getHeight() - mOverlayHeight + mOverlayVerticalInset,                paint);        // Draw movie duration at the right of the overlay.        canvas.drawText(duration,                bitmap.getWidth() - paint.measureText(duration) - mOverlayHorizontalInset,                bitmap.getHeight() - mOverlayHeight + mOverlayVerticalInset,                paint);    }

title = TextUtils.ellipsize(title, new TextPaint(paint), availableTitleWidth, TextUtils.TruncateAt.END).toString();