Android 等比例縮放圖片

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// 縮放圖片public static Bitmap zoomImg(String img, int newWidth ,int newHeight){// 圖片源   Bitmap bm = BitmapFactory.decodeFile(img);   if(null!=bm){    return zoomImg(bm,newWidth,newHeight);   }   return null;}public static Bitmap zoomImg(Context context,String img, int newWidth ,int newHeight){// 圖片源try {Bitmap bm = BitmapFactory.decodeStream(context.getAssets().open(img));if (null != bm) {return zoomImg(bm, newWidth, newHeight);}} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}return null;}// 縮放圖片public static Bitmap zoomImg(Bitmap bm, int newWidth ,int newHeight){   // 獲得圖片的寬高   int width = bm.getWidth();   int height = bm.getHeight();   // 計算縮放比例   float scaleWidth = ((float) newWidth) / width;   float scaleHeight = ((float) newHeight) / height;   // 取得想要縮放的matrix參數   Matrix matrix = new Matrix();   matrix.postScale(scaleWidth, scaleHeight);   // 得到新的圖片   Bitmap newbm = Bitmap.createBitmap(bm, 0, 0, width, height, matrix, true);    return newbm;}

 

Android 等比例縮放圖片