Animação - Círculo de tempo

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.os.Handler;
import android.view.View;

public class ActivityTeste extends Activity implements Runnable {

    int angle = 1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Handler handler = new Handler();
        for(int i = 0;i < 360;i++) {
            handler.postDelayed(this, 100 * i/10);
        }
    }

    private class Teste extends View {
        int angle;

        public Teste(Context context, int angle) {
            super(context);
            this.angle = angle;
        }

        @Override
        protected void onDraw(Canvas canvas) {
            super.onDraw(canvas);

            Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
            paint.setColor(Color.GREEN);
            paint.setAlpha(50);
            RectF rect = new RectF(new Rect(0, 0, 300, 300));
            canvas.drawArc(rect, 270, angle, true, paint);
            invalidate();
        }
    }

    @Override
    public void run() {
        setContentView(new Teste(this, this.angle++));
    }
}