我有一个位图采取的Base64字符串从我的远程数据库,(encodedImage是字符串表示图像与Base64):

profileImage = (ImageView)findViewById(R.id.profileImage);

byte[] imageAsBytes=null;
try {
    imageAsBytes = Base64.decode(encodedImage.getBytes());
} catch (IOException e) {e.printStackTrace();}

profileImage.setImageBitmap(
    BitmapFactory.decodeByteArray(imageAsBytes, 0, imageAsBytes.length)
);

profileImage是我的ImageView

但在显示在布局的ImageView中之前,我需要调整图像的大小。我得把它调整到120x120。

有人能告诉我调整大小的代码吗?

我发现的例子不能应用于base64字符串获得位图。


当前回答

* For resize bitmap with width and height ratio.    

public static Bitmap getResizedBitmap(Bitmap image, int maxSize) {
            int width = image.getWidth();
            int height = image.getHeight();
    
            float bitmapRatio = (float) width / (float) height;
            if (bitmapRatio > 1) {
                width = maxSize;
                height = (int) (width / bitmapRatio);
            } else {
                height = maxSize;
                width = (int) (height * bitmapRatio);
            }
            return Bitmap.createScaledBitmap(image, width, height, true);
        }

其他回答

试试这段代码:

BitmapDrawable drawable = (BitmapDrawable) imgview.getDrawable();
Bitmap bmp = drawable.getBitmap();
Bitmap b = Bitmap.createScaledBitmap(bmp, 120, 120, false);

希望对大家有用。

如果你已经有一个位图,你可以使用下面的代码来调整大小:

Bitmap originalBitmap = <original initialization>;
Bitmap resizedBitmap = Bitmap.createScaledBitmap(
    originalBitmap, newWidth, newHeight, false);
      Try this kotlin code for resize....Where Max size any size you 
      want

      fun getResizedBitmap(image: Bitmap?, maxSize: Int): Bitmap {
    var width = image!!.width
    var height = image.height
    val bitmapRatio = width.toFloat() / height.toFloat()
     if (bitmapRatio > 0) {
        width = maxSize
        height = (width / bitmapRatio).toInt()
     } else {
        height = maxSize
         width = (height * bitmapRatio).toInt()
     }
         return Bitmap.createScaledBitmap(image, width, height, true)
     }

试试这个: 这个函数按比例调整位图的大小。当最后一个参数设置为“X”时,newDimensionXorY被视为s的新宽度,当设置为“Y”时,一个新的高度。

public Bitmap getProportionalBitmap(Bitmap bitmap, 
                                    int newDimensionXorY, 
                                    String XorY) {
    if (bitmap == null) {
        return null;
    }

    float xyRatio = 0;
    int newWidth = 0;
    int newHeight = 0;

    if (XorY.toLowerCase().equals("x")) {
        xyRatio = (float) newDimensionXorY / bitmap.getWidth();
        newHeight = (int) (bitmap.getHeight() * xyRatio);
        bitmap = Bitmap.createScaledBitmap(
            bitmap, newDimensionXorY, newHeight, true);
    } else if (XorY.toLowerCase().equals("y")) {
        xyRatio = (float) newDimensionXorY / bitmap.getHeight();
        newWidth = (int) (bitmap.getWidth() * xyRatio);
        bitmap = Bitmap.createScaledBitmap(
            bitmap, newWidth, newDimensionXorY, true);
    }
    return bitmap;
}

变化:

profileImage.setImageBitmap(
    BitmapFactory.decodeByteArray(imageAsBytes, 0, imageAsBytes.length)

To:

Bitmap b = BitmapFactory.decodeByteArray(imageAsBytes, 0, imageAsBytes.length)
profileImage.setImageBitmap(Bitmap.createScaledBitmap(b, 120, 120, false));