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等比例縮放圖片
/ 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 block
e.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;
}
最後更新：2017-04-03 12:53:47