pcwiki的部落格

图片合成

 /**
  * 图片合成
  * @param bitmap
  * @return
  */
private Bitmap createBitmap( Bitmap src, Bitmap watermark ) {
     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;
}

图片圆角

 /**
  * 图片圆角
  * @param bitmap
  * @return
  */
 public static Bitmap getRoundedCornerBitmap(Bitmap bitmap) { 
     Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), 
         bitmap.getHeight(), Config.ARGB_8888); 
     Canvas canvas = new Canvas(output);

     final int color = 0xff424242; 
     final Paint paint = new Paint(); 
     final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight()); 
     final RectF rectF = new RectF(rect); 
     final float roundPx = 12;

     paint.setAntiAlias(true); 
     canvas.drawARGB(0, 0, 0, 0); 
     paint.setColor(color); 
     canvas.drawRoundRect(rectF, roundPx, roundPx, paint);

     paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN)); 
     canvas.drawBitmap(bitmap, rect, rect, paint); 
     return output; 
 }

图片缩放、翻转和旋转

 /**
  * 缩放、翻转和旋转图片
  * @param bmpOrg
  * @param rotate
  * @return
  */
 private android.graphics.Bitmap gerZoomRotateBitmap(
   android.graphics.Bitmap bmpOrg, int rotate) {
  // 获取图片的原始的大小
  int width = bmpOrg.getWidth();
  int height = bmpOrg.getHeight();

  int newWidth = 300;
  int newheight = 300;
  // 定义缩放的高和宽的比例
  float sw = ((float) newWidth) / width;
  float sh = ((float) newheight) / height;
  // 创建操作图片的用的Matrix对象
  android.graphics.Matrix matrix = new android.graphics.Matrix();
  // 缩放翻转图片的动作
  // sw sh的绝对值为绽放宽高的比例，sw为负数表示X方向翻转，sh为负数表示Y方向翻转
  matrix.postScale(sw, sh);
  // 旋转30*
  matrix.postRotate(rotate);
  //创建一个新的图片   
  android.graphics.Bitmap resizeBitmap = android.graphics.Bitmap
    .createBitmap(bmpOrg, 0, 0, width, height, matrix, true);
  return resizeBitmap;
 }