弧を描画するには(Canvas.drawArc)

package jp.mediawing.android.test;

import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.RectF;
import android.os.Bundle;
import android.view.View;

public class TestActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(new DrawTest(this));
    }

    // Viewをextendsしたクラスを作成し描画処理をする
    static public class DrawTest extends View {

		public DrawTest(Context context) {
			super(context);
		}

        // 描画処理を記述
		@Override
		protected void onDraw(Canvas canvas) {
		    Paint paint = new Paint();
		    paint.setColor(Color.argb(255, 255, 255, 255));
		    
		    // (20, 20) から(60, 60) 矩形を範囲とし
		    RectF oval1 = new RectF(20.0f, 20.0f, 60.0f, 60.0f);
		    // 0～30(0度から-30度)の範囲を描画
		    canvas.drawArc(oval1, 0, 30, true, paint);
		    
		    // アンチエイリアスを設定
		    paint.setAntiAlias(true);

		    RectF oval2 = new RectF(100.0f, 20.0f, 140.0f, 60.0f);
		    canvas.drawArc(oval2, 0, 90, true, paint);
		    
		    RectF oval3 = new RectF(180.0f, 20.0f, 220.0f, 60.0f);
		    canvas.drawArc(oval3, 90, 120, true, paint);
		    
		    RectF oval4 = new RectF(260.0f, 20.0f, 300.0f, 60.0f);
			canvas.drawArc(oval4, 90, 270, true, paint);
			
			// 中心点を通さない
		    RectF oval5 = new RectF(100.0f, 80.0f, 140.0f, 120.0f);
		    canvas.drawArc(oval5, 0, 90, false, paint);
			
			RectF oval6 = new RectF(260.0f, 80.0f, 300.0f, 120.0f);
			canvas.drawArc(oval6, 90, 270, false, paint);
			
			// 塗りつぶしなしで描画
		    paint.setStyle(Paint.Style.STROKE);
		    paint.setStrokeWidth(5);
		    paint.setColor(Color.BLUE);
		    
		    RectF oval7 = new RectF(100.0f, 140.0f, 140.0f, 180.0f);
		    canvas.drawArc(oval7, 0, 90, false, paint);
			
			RectF oval8 = new RectF(260.0f, 140.0f, 300.0f, 180.0f);
			canvas.drawArc(oval8, 90, 270, false, paint);
		}
    }
}

Android Developers - Canvas