获取Bitmap附加到ImageView

Question

鉴于

ImageView image = R.findViewById(R.id.imageView);
image.setImageBitmap(someBitmap);

是否可以检索位图？

Answer 1

Bitmap bitmap = ((BitmapDrawable)image.getDrawable()).getBitmap();

Answer 2

这会从Bitmap获得ImageView。但是，它与您设置的位图对象不同。这是一个新的。

imageView.buildDrawingCache();
Bitmap bitmap = imageView.getDrawingCache();

===编辑===

 imageView.setDrawingCacheEnabled(true);
 imageView.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), 
                   MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
 imageView.layout(0, 0, 
                  imageView.getMeasuredWidth(), imageView.getMeasuredHeight()); 
 imageView.buildDrawingCache(true);
 Bitmap bitmap = Bitmap.createBitmap(imageView.getDrawingCache());
 imageView.setDrawingCacheEnabled(false);

Answer 3

写下面的代码

ImageView yourImageView = (ImageView) findViewById(R.id.yourImageView);
Bitmap bitmap = ((BitmapDrawable)yourImageView.getDrawable()).getBitmap();

Answer 4

此代码更好。

public static  byte[] getByteArrayFromImageView(ImageView imageView)
    {
        BitmapDrawable bitmapDrawable = ((BitmapDrawable) imageView.getDrawable());
        Bitmap bitmap;
        if(bitmapDrawable==null){
            imageView.buildDrawingCache();
            bitmap = imageView.getDrawingCache();
            imageView.buildDrawingCache(false);
        }else
        {
            bitmap = bitmapDrawable .getBitmap();
        }
        ByteArrayOutputStream stream = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.JPEG, 100, stream);
        return stream.toByteArray();
    }

Answer 5

对于那些正在寻找Kotlin解决方案以从Bitmap获得ImageView的人。

var bitmap = (image.drawable as BitmapDrawable).bitmap

Answer 6

获取图像位图的其他方法是这样做：

Bitmap imagenAndroid = BitmapFactory.decodeResource(getResources(),R.drawable.jellybean_statue);
imageView.setImageBitmap(imagenAndroid);

Answer 7

试试这段代码：

UIStoryboard