Question

我想在Android中实现以下效果： http://i.imgur.com/SPwQuNq.png

我非常接近使用下面的方法，但我现在需要它来清除背景，而文本仍然存在。叠加文本也有一个浅色调 - 因为#setColor（Color.WHITE） - 但没有它也没有显示文字。

public static Bitmap filterTextLetters(Bitmap bitmap, String text) {
    Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
    paint.setColor(Color.WHITE);
    paint.setTextAlign(Align.CENTER);
    paint.setTypeface(Typeface.DEFAULT_BOLD);
    paint.setTextSize(180);
    paint.setXfermode(new PixelXorXfermode(Color.BLACK));

    Bitmap photo = bitmap.copy(Bitmap.Config.ARGB_8888, true);
    Canvas canvas = new Canvas(photo);

    canvas.drawText(text, Statics.PHOTO_WIDTH / 2, Statics.PHOTO_HEIGHT / 2, paint);

    return photo;
}

Answer 1

您可以使用BitmapShader：

public static Bitmap filterTextLetters(Bitmap bitmap, String text) {
  Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
  paint.setTextAlign(Align.CENTER);
  paint.setTypeface(Typeface.DEFAULT_BOLD);
  paint.setTextSize(180);

  Shader shader = new BitmapShader(
      bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
  paint.setShader(shader);

  final int width = bitmap.getWidth();
  final int height = bitmap.getHeight();
  Bitmap photo = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
  Canvas canvas = new Canvas(photo);
  canvas.drawText(text, width / 2, height / 2, paint);

  return photo;
}

适用于Android的位图文字剪裁

1 个答案: