android imageview 中未显示 Base64 图像

Question

我试图在图像视图中显示 base64 图像，但它没有显示。我正在解码和设置图像视图的图像位图。我正在动态添加图像视图。问题是因为我正在动态添加图像吗？下面是代码片段：

LayoutInflater inflaterDocuments = (LayoutInflater)GetSystemService(Context.LayoutInflaterService);
View inflatedHeaderLayout = inflaterDocuments.Inflate(Resource.Layout.imageListItem, null, false);
ImageView imageView = inflatedHeaderLayout.FindViewById<ImageView>(Resource.Id.imageView);
byte[] decodedString = Base64.Decode(base64String, Base64Flags.Default);
Bitmap bitMap = BitmapFactory.DecodeByteArray(decodedString, 0, decodedString.Length);
imageView.SetImageBitmap(bitMap);
imageView.Invalidate();
_imageLayout.AddView(inflatedHeaderLayout);

编辑

Base64 字符串文件Base64.txt

Answer 1

创建将 Base64 转换为 Bitmap

的方法

public Bitmap BaseStringToBitmap(string imageBase64)
{
    byte[] imageBytes = Convert.FromBase64String(imageBase64);
    return BitmapFactory.DecodeByteArray(imageBytes, 0, imageBytes.Length);
}

比在 ImageView 对象上使用它

imageView.SetImageBitmap(BaseStringToBitmap(base64String));

示例代码

protected override void OnCreate(Bundle savedInstanceState)
{
    base.OnCreate(savedInstanceState);
    SetContentView(Resource.Layout.activity_main);
    var iv = FindViewById<Android.Widget.ImageView>(Resource.Id.image1);
    iv.SetImageBitmap(BaseStringToBitmap());
}   
public Bitmap BaseStringToBitmap()
{
    var bse64 = "/9j/4ZT8RXhpZgAASUkqAAgAAAARAA4BAgAgAAAA2gAAAA8BAgAgAAAA...";
    byte[] imageBytes = Convert.FromBase64String(bse64);
    return BitmapFactory.DecodeByteArray(imageBytes, 0, imageBytes.Length);
}

一个xml文件

<ImageView
android:id="@+id/image1"
android:background="#89CFF0"    
android:layout_width="200dp" 
android:layout_height="200dp"/>

输出截图

Answer 2

这是获取base64的方法

public static String getBase64String(Bitmap image) {
    String encodeString = null;
    try {
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        image.compress(Bitmap.CompressFormat.JPEG, 100, byteArrayOutputStream);
        byte[] byteArray = byteArrayOutputStream.toByteArray();
        encodeString = Base64.encodeToString(byteArray, Base64.DEFAULT);
    } catch (Exception e) {
        e.printStackTrace();
    }
    return encodeString;
}

Glide 用于展示图片

String photoId = base64;
    Glide.with(getApplicationContext())
            .load(photoId)
            .apply(RequestOptions.circleCropTransform())
            .into(employeeImage);

android imageview 中未显示 Base64 图像

Base64 image not displayed in android imageview

base64

android

imageview

xamarin.android