水印的生成方法

文字水印的生成方法

File fImage = new File("/sdcard/dcim", "beijing.jpeg");
FileOutputStream iStream = new FileOutputStream(fImage);

Bitmap oriBmp
oriBmp.compress(CompressFormat.JPEG, 100, iStream);

int w = 320, h = 240;
String mstrTitle = "感受Android带给我们的新体验";
Bitmap mbmpTest = Bitmap.createBitmap(w,h, Config.ARGB_8888);
Canvas canvasTemp = new Canvas(mbmpTest);
canvasTemp.drawColor(Color.WHITE);
Paint p = new Paint();
String familyName = "宋体";
Typeface font = Typeface.create(familyName,Typeface.BOLD);
p.setColor(Color.RED);
p.setTypeface(font);
p.setTextSize(22);
canvasTemp.drawText(mstrTitle,0,100,p);

图片水印的生成方法


  生成水印的过程,其实分为三个环节:第一,载入原始图片;第二,载入水印图片;第三,保存新的图片。

/**
 * create the bitmap from a byte array
 *
 * @param src the bitmap object you want proecss
 * @param watermark the water mark above the src
 * @return return a bitmap object ,if paramter's length is 0,return null
 */
private Bitmap createBitmap(Bitmap src, Bitmap watermark)
{
  String TAG = "createBitmap";
  Log.d(TAG, "create a new bitmap");
  if (src == null)
  {
      return null;
  }

  int w = src.getWidth();
  int h = src.getHeight();
  int ww = watermark.getWidth();
  int wh = watermark.getHeight();

  //create the new blank bitmap
  Bitmap newb = Bitmap.createBitmap(w, h, Config.ARGB_8888);//创建一个新的和SRC长度宽度一样的位图
  Canvas cv = new Canvas(newb);

  //draw src into
  cv.drawBitmap(src, 0, 0, null);//在 0,0坐标开始画入src

  //draw watermark into
  cv.drawBitmap(watermark, w - ww + 5, h - wh + 5, null);//在src的右下角画入水印

  //save all clip
  cv.save(Canvas.ALL_SAVE_FLAG);//保存

  //store
    cv.restore();//存储

  return newb;
}

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