あなたはドローハーフサークルのために、以下のクラスを使用することができます
public class MyView extends View {
public MyView(Context context) {
super(context);
// TODO Auto-generated constructor stub
}
@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
super.onDraw(canvas);
float width = (float) getWidth();
float height = (float) getHeight();
float radius;
if (width > height) {
radius = height/4;
} else {
radius = width/4;
}
Path path = new Path();
path.addCircle(width/2,
height/2, radius,
Path.Direction.CW);
Paint paint = new Paint();
paint.setColor(Color.BLACK);
paint.setStrokeWidth(5);
paint.setStyle(Paint.Style.FILL);
float center_x, center_y;
final RectF oval = new RectF();
paint.setStyle(Paint.Style.STROKE);
center_x = width/2;
center_y = height/2;
oval.set(center_x - radius,
center_y - radius,
center_x + radius,
center_y + radius);
canvas.drawArc(oval, 90, 180, false, paint);
}
}
出力
![enter image description here](https://i.stack.imgur.com/OPn4E.png)
http://android-dev-tips-and-tricks.blogspot.in/2012/08/xml-drawables-part-i.html –
私の問題にはあまり役立たないが、円はまだソリッドカラー – Redman
https://docs.oracle.com/javase/tutorial/2d/ –