android 实现图片加水印

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

FileOutputStream iStream = new FileOutputStream(fImage); 

* 取出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);

6.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;

  }




转自:http://blog.csdn.net/hachirou/archive/2010/04/11/5473312.aspx

原文地址,http://www.devdiv.com/home.php?mod=space&uid=19970&do=blog&id=3868

 

 

//根据我自己的需要改进了一下

    //获取图片缩小的图片
    public static Bitmap scaleBitmap(String src,int max)
    {
        //获取图片的高和宽
        BitmapFactory.Options options = new BitmapFactory.Options();
        //这一个设置使 BitmapFactory.decodeFile获得的图片是空的,但是会将图片信息写到options中
        options.inJustDecodeBounds = true;        
        BitmapFactory.decodeFile(src, options); 
       // 计算比例 为了提高精度,本来是要640 这里缩为64
        max=max/10;
        int be = options.outWidth / max;
         if(be%10 !=0)
          be+=10;
         be=be/10;
         if (be <= 0)
          be = 1;
        options.inSampleSize = be;
        //设置可以获取数据
        options.inJustDecodeBounds = false;
        //获取图片
        return BitmapFactory.decodeFile(src, options);        
    }
    // 加水印 也可以加文字
    public static Bitmap watermarkBitmap(Bitmap src, Bitmap watermark,
            String title) {
        if (src == null) {
            return null;
        }
        int w = src.getWidth();
        int h = src.getHeight(); 
        //需要处理图片太大造成的内存超过的问题,这里我的图片很小所以不写相应代码了        
        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);
        cv.drawBitmap(src, 0, 0, null);// 在 0,0坐标开始画入src    
        Paint paint=new Paint();
        //加入图片
        if (watermark != null) {
            int ww = watermark.getWidth();
            int wh = watermark.getHeight();
            paint.setAlpha(50);
            cv.drawBitmap(watermark, w - ww + 5, h - wh + 5, paint);// 在src的右下角画入水印            
        }
        //加入文字
        if(title!=null)
        {
            String familyName ="宋体";
            Typeface font = Typeface.create(familyName,Typeface.BOLD);            
            TextPaint textPaint=new TextPaint();
            textPaint.setColor(Color.RED);
            textPaint.setTypeface(font);
            textPaint.setTextSize(22);
            //这里是自动换行的
            StaticLayout layout = new StaticLayout(title,textPaint,w,Alignment.ALIGN_NORMAL,1.0F,0.0F,true);
            layout.draw(cv);
            //文字就加左上角算了
            //cv.drawText(title,0,40,paint); 
        }
        cv.save(Canvas.ALL_SAVE_FLAG);// 保存
        cv.restore();// 存储
        return newb;
    }

 

posted @ 2012-08-15 09:57  meieiem  阅读(23688)  评论(0编辑  收藏  举报