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

有人问在这种情况下如何保持纵横比:

计算用于缩放的因子,并将其用于两个维度。 假设你想要一个图像的高度是屏幕的20%

int scaleToUse = 20; // this will be our percentage
Bitmap bmp = BitmapFactory.decodeResource(
    context.getResources(), R.drawable.mypng);
int sizeY = screenResolution.y * scaleToUse / 100;
int sizeX = bmp.getWidth() * sizeY / bmp.getHeight();
Bitmap scaled = Bitmap.createScaledBitmap(bmp, sizeX, sizeY, false);

为了获得屏幕分辨率,你有这样的解决方案: 以像素为单位获取屏幕尺寸

其他回答

保持纵横比,

  public Bitmap resizeBitmap(Bitmap source, int width,int height) {
    if(source.getHeight() == height && source.getWidth() == width) return source;
    int maxLength=Math.min(width,height);
    try {
        source=source.copy(source.getConfig(),true);
        if (source.getHeight() <= source.getWidth()) {
            if (source.getHeight() <= maxLength) { // if image already smaller than the required height
                return source;
            }

            double aspectRatio = (double) source.getWidth() / (double) source.getHeight();
            int targetWidth = (int) (maxLength * aspectRatio);

            return Bitmap.createScaledBitmap(source, targetWidth, maxLength, false);
        } else {

            if (source.getWidth() <= maxLength) { // if image already smaller than the required height
                return source;
            }

            double aspectRatio = ((double) source.getHeight()) / ((double) source.getWidth());
            int targetHeight = (int) (maxLength * aspectRatio);

            return Bitmap.createScaledBitmap(source, maxLength, targetHeight, false);

        }
    }
    catch (Exception e)
    {
        return source;
    }
}

基于纵横比的规模:

float aspectRatio = yourSelectedImage.getWidth() / 
    (float) yourSelectedImage.getHeight();
int width = 480;
int height = Math.round(width / aspectRatio);

yourSelectedImage = Bitmap.createScaledBitmap(
    yourSelectedImage, width, height, false);

使用高度作为基础而不是宽度更改为:

int height = 480;
int width = Math.round(height * aspectRatio);

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);

在API 19中,位图setWidth(int width)和setHeight(int height)已经存在。 http://developer.android.com/reference/android/graphics/Bitmap.html

有人问在这种情况下如何保持纵横比:

计算用于缩放的因子,并将其用于两个维度。 假设你想要一个图像的高度是屏幕的20%

int scaleToUse = 20; // this will be our percentage
Bitmap bmp = BitmapFactory.decodeResource(
    context.getResources(), R.drawable.mypng);
int sizeY = screenResolution.y * scaleToUse / 100;
int sizeX = bmp.getWidth() * sizeY / bmp.getHeight();
Bitmap scaled = Bitmap.createScaledBitmap(bmp, sizeX, sizeY, false);

为了获得屏幕分辨率,你有这样的解决方案: 以像素为单位获取屏幕尺寸