在Android平台上,如果要在API级别低于20的设备上获取圆形图像视图,可以使用以下步骤:
public class CircleImageView extends ImageView {
public CircleImageView(Context context) {
super(context);
}
public CircleImageView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public CircleImageView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
protected void onDraw(Canvas canvas) {
Drawable drawable = getDrawable();
if (drawable == null) {
return;
}
if (getWidth() == 0 || getHeight() == 0) {
return;
}
Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();
Bitmap circularBitmap = getCircularBitmap(bitmap);
canvas.drawBitmap(circularBitmap, 0, 0, null);
}
private Bitmap getCircularBitmap(Bitmap bitmap) {
Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
canvas.drawCircle(bitmap.getWidth() / 2, bitmap.getHeight() / 2, bitmap.getWidth() / 2, paint);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
return output;
}
}
CircleImageView circleImageView = findViewById(R.id.circle_image_view);
String imageUrl = "https://example.com/image.jpg";
Picasso.get().load(imageUrl).into(circleImageView);
这样,你就可以在API级别低于20的Android设备上获取圆形图像视图了。
请注意,这只是一种实现圆形图像视图的方法之一。在实际开发中,你可以根据自己的需求和偏好选择其他方法或库来实现相同的效果。
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