Android 圖片添加文字水印

        /**


     * 添加文字到圖片，類似水印文字。 
     * @param gContext 
     * @param gResId 
     * @param gText 
     * @return 
     */  
    public static Bitmap drawTextToBitmap(Context gContext, int gResId, String gText) {  
        Resources resources = gContext.getResources();  
        float scale = resources.getDisplayMetrics().density;  
        Bitmap bitmap = BitmapFactory.decodeResource(resources, gResId);  

        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.rgb(61,61,61));  
        // text size in pixels  
        paint.setTextSize((int) (14 * scale*5));  
        // text shadow  
        paint.setShadowLayer(1f, 0f, 1f, Color.WHITE);  

        // draw text to the Canvas center  
        Rect bounds = new Rect();  
        paint.getTextBounds(gText, 0, gText.length(), bounds);  
//      int x = (bitmap.getWidth() - bounds.width()) / 2;  
//      int y = (bitmap.getHeight() + bounds.height()) / 2;  
        //draw  text  to the bottom  
        int x = (bitmap.getWidth() - bounds.width())/10*9 ;  
        int y = (bitmap.getHeight() + bounds.height())/10*9;  
        canvas.drawText(gText, x , y, paint);  

        return bitmap;  
    }  </pre><br />