我需要实现一个圆形进度条,以便在Fresco下载图像时进行显示和更新。该类必须按照Fresco方法setProgressBarImage()的要求从Drawable扩展。
我的类(class)是使用Fresco加载图像,如下所示:
SimpleDraweeView simpleDraweeView = (SimpleDraweeView) view.findViewById(R.id.image);
simpleDraweeView.getHierarchy().setProgressBarImage(new ProgressBarDrawable());
simpleDraweeView.setImageURI(message.getMessageImage().getImageFileUriForList());
“图像” SimpleDraweeView的XML如下:
<com.facebook.drawee.view.SimpleDraweeView
android:id="@+id/image"
android:layout_width="192dp"
android:layout_height="200dp"
android:layout_margin="7dp"
android:layout_gravity="center"
fresco:actualImageScaleType="fitCenter"
tools:background="@drawable/gallery_attach_dialog" />
问题是我需要用一个圆形的替换这个标准的水平进度条。而且Fresco没有提供可绘制的圆形进度条。
有人对此有实现的想法吗?
最佳答案
您可以只实现Drawable
,因为ProgressBarDrawable
只是实现和覆盖 super 方法。如前所述,该问题应视为重复的。
public class ImageLoadProgressBar extends ProgressBarDrawable {
float level;
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
int color = whatevercolorresource;
final RectF oval = new RectF();
int radius = whateverradius;
public ImageLoadProgressBar(){
paint.setStrokeWidth(whateveintyouputhere);
paint.setStyle(Paint.Style.STROKE);
}
@Override
protected boolean onLevelChange(int level) {
this.level = level;
invalidateSelf();
return true;
}
@Override
public void draw(Canvas canvas) {
oval.set(canvas.getWidth() / 2 - radius, canvas.getHeight() / 2 - radius,
canvas.getWidth() / 2 + radius, canvas.getHeight() / 2 + radius);
drawCircle(canvas, level, color);
}
private void drawCircle(Canvas canvas, float level, int color) {
paint.setColor(color);
float angle;
angle = 360 / 1f;
angle = level * angle;
canvas.drawArc(oval, 0, Math.round(angle), false, paint);
}
}