我正在开发一款Xamarin Android应用程序,需要制作一个圆形的ImageView
。
如何实现?
我正在开发一款Xamarin Android应用程序,需要制作一个圆形的ImageView
。
如何实现?
.axml
中添加这个即可:<RoundedImageView
local:riv_corner_radius="15dp"
local:riv_oval="false"
android:scaleType="centerCrop"
android:layout_width="30dp"
android:layout_height="30dp" />
未来读者请注意: 我为Xamarin.Android编写了RoundedImageView
的端口,基于此帖子中链接的库。源代码可以在这里找到,NuGet包可以在这里找到。同时还包括用于MvvmCross的MvxRoundedImageView
。error APT0000: No resource identifier found for attribute 'riv_corner_radius' in package 'com.my.app'
。我是不是漏掉了什么东西? - Felix <refractored.controls.CircleImageView
android:id="@+id/ImageProfile"
android:layout_width="80dp"
android:layout_height="80dp"
android:scaleType="fitCenter"
android:src="@drawable/app_icon"
android:layout_gravity="center_horizontal"/>
=========================================================================== 从Nuget包中添加Refractored.controls.CircleImageView的引用到您的项目中。
以上代码适用于原生Android。您需要调整代码以将其转换为C#语法并采用Xamarin Android。为了方便起见,我已将代码更改为C#。
public class ImageHelper
{
public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, int pixels) {
Bitmap output = Bitmap.CreateBitmap(bitmap.Width, bitmap.Height
, Android.Graphics.Bitmap.Config.Argb8888);
Canvas canvas = new Canvas(output);
Color color = Color.DodgerBlue;
Paint paint = new Paint();
Rect rect = new Rect(0, 0, bitmap.Width, bitmap.Height);
RectF rectF = new RectF(rect);
float roundPx = pixels;
paint.AntiAlias = true;
canvas.DrawARGB(0, 0, 0, 0);
paint.Color = color;
canvas.DrawRoundRect(rectF, roundPx, roundPx, paint);
paint.SetXfermode(new PorterDuffXfermode(Android.Graphics.PorterDuff.Mode.SrcIn));
canvas.DrawBitmap(bitmap, rect, rect, paint);
return output;
}
public class CircleDrawable : Drawable
{
Bitmap bmp;
BitmapShader bmpShader;
Paint paint;
RectF oval;
public CircleDrawable (Bitmap bmp)
{
this.bmp = bmp;
this.bmpShader = new BitmapShader (bmp, Shader.TileMode.Clamp, Shader.TileMode.Clamp);
this.paint = new Paint () { AntiAlias = true };
this.paint.SetShader (bmpShader);
this.oval = new RectF ();
}
public override void Draw (Canvas canvas)
{
canvas.DrawOval (oval, paint);
}
protected override void OnBoundsChange (Rect bounds)
{
base.OnBoundsChange (bounds);
oval.Set (0, 0, bounds.Width (), bounds.Height ());
}
public override int IntrinsicWidth {
get {
return bmp.Width;
}
}
public override int IntrinsicHeight {
get {
return bmp.Height;
}
}
public override void SetAlpha (int alpha)
{
}
public override int Opacity {
get {
return (int)Format.Opaque;
}
}
public override void SetColorFilter (ColorFilter cf)
{
}
}
源代码:https://github.com/xamarin/xamarin-store-app/blob/master/XamarinStore.Droid/Views/CircleDrawable.cs