Android 图片添加水印图片或者文字

给图片添加水印的基本思路都是载入原图，添加文字或者载入水印图片，保存图片这三个部分

添加水印图片：

 

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private Bitmap createWaterMaskImage(Context gContext, 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, 20, 20, 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;     }

添加文字

 

 

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public static Bitmap scaleWithWH(Bitmap src, double w, double h) {           if (w == 0 || h == 0 || src == null) {               return src;           } else {               // 记录src的宽高               int width = src.getWidth();               int height = src.getHeight();               // 创建一个matrix容器               Matrix matrix = new Matrix();               // 计算缩放比例               float scaleWidth = (float) (w / width);               float scaleHeight = (float) (h / height);               // 开始缩放               matrix.postScale(scaleWidth, scaleHeight);               // 创建缩放后的图片               return Bitmap.createBitmap(src, 0, 0, width, height, matrix, true);           }       }       public Bitmap drawTextToBitmap(Context gContext,               int gResId,               String gText) {              Resources resources = gContext.getResources();              float scale = resources.getDisplayMetrics().density;              Bitmap bitmap =                   BitmapFactory.decodeResource(resources, gResId);                             bitmap = scaleWithWH(bitmap, 300*scale, 300*scale);                           android.graphics.Bitmap.Config bitmapConfig =                  bitmap.getConfig();                                                        // set default bitmap config if none              if(bitmapConfig == null) {                bitmapConfig = android.graphics.Bitmap.Config.ARGB_8888;              }              // resource bitmaps are imutable,               // so we need to convert it to mutable one              bitmap = bitmap.copy(bitmapConfig, true);                             Canvas canvas = new Canvas(bitmap);              // new antialised Paint              Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);              // text color - #3D3D3D              paint.setColor(Color.RED);                paint.setTextSize((int) (18 * scale));                           paint.setDither(true); //获取跟清晰的图像采样               paint.setFilterBitmap(true);//过滤一些              Rect bounds = new Rect();              paint.getTextBounds(gText, 0, gText.length(), bounds);                          int x = 30;              int y = 30;                          canvas.drawText(gText, x * scale, y * scale, paint);                             return bitmap;            }

 

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