闲来无事，做一个简单的抽奖转盘ui实现，供你参考

/** *  */package com.microchange.lucky;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.RectF;import android.util.AttributeSet;import android.util.Log;import android.view.MotionEvent;import android.view.View;public class HalfCircle extends View {	private Paint paint;	private RectF oval;	private float startAngle;	private float sweepSpeed;	private float sweepAngle;	boolean useCenter;	int count;//  等份	@Override	protected void onDraw(Canvas canvas) {		setSweepAngle(count);		while (startAngle <= 360) {			if (startAngle % (count*3) == 0) {				paint.setColor(Color.BLUE);			} else if (startAngle % (count*2) == 0){				paint.setColor(Color.GREEN);			}else {				paint.setColor(Color.RED);			}			Log.e(""+startAngle, paint.getColor()+"");			canvas.drawArc(oval, startAngle, sweepAngle, useCenter, paint);			startAngle += count;		}		float centerX = oval.centerX();		float centerY = oval.centerY();		paint.setColor(Color.WHITE);//		paint.setStrokeWidth(5);//		paint.setStyle(Paint.Style.STROKE); //设置空心		paint.setAntiAlias(true);  //消除锯齿 		canvas.drawCircle(centerX, centerY, 50, paint);		String text = "奖";		paint.setTextSize(20 * getContext().getResources().getDisplayMetrics().density);		float measureText = paint.measureText(text);		float textY = paint.descent() - paint.ascent();		paint.setColor(Color.RED);//		canvas.drawLine(0, centerY, 480, centerY, paint);//		canvas.drawText(text, centerX-(measureText/2), centerY, paint);		canvas.drawText(text, centerX-(measureText/2), centerY+(textY/4), paint);	}	private void init() {		paint = new Paint();		paint.setColor(Color.BLUE);		paint.setAntiAlias(true);		paint.setStrokeWidth(5);	}	@Override	public boolean onTouchEvent(MotionEvent event) {		return super.onTouchEvent(event);	}			/**	 * @return the count	 */	public int getCount() {		return count;	}	/**	 * @param count the count to set	 */	public void setCount(int count) {		this.count = 360 / count;	}	public Paint getPaint() {		return paint;	}	public void setPaint(Paint paint) {		this.paint = paint;	}	public RectF getOval() {		return oval;	}	public void setOval(RectF oval) {		this.oval = oval;	}	public float getStartAngle() {		return startAngle;	}	public void setStartAngle(float startAngle) {		this.startAngle = startAngle;	}	public float getSweepSpeed() {		return sweepSpeed;	}	public void setSweepSpeed(float sweepSpeed) {		this.sweepSpeed = sweepSpeed;	}	public float getSweepAngle() {		return sweepAngle;	}	public void setSweepAngle(float sweepAngle) {		this.sweepAngle = sweepAngle;	}	public boolean isUseCenter() {		return useCenter;	}	public void setUseCenter(boolean useCenter) {		this.useCenter = useCenter;	}	public HalfCircle(Context context, AttributeSet attrs, int defStyle) {		super(context, attrs, defStyle);		init();	}	public HalfCircle(Context context, AttributeSet attrs) {		this(context, attrs, 0);	}	public HalfCircle(Context context) {		this(context, null, 0);	}}

package com.microchange.lucky;import android.app.Activity;import android.graphics.RectF;import android.os.Bundle;import android.view.animation.AccelerateInterpolator;import android.view.animation.Animation;import android.view.animation.DecelerateInterpolator;import android.view.animation.Interpolator;import android.view.animation.RotateAnimation;public class MainActivity extends Activity {	RectF rect;	int radius = 300;	@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		HalfCircle circle = new HalfCircle(getApplicationContext());		circle.setOval(getRectF());//		circle.setStartAngle(90);		circle.setUseCenter(true);		circle.setCount(9);		Animation animation = new RotateAnimation(0, 135*10, getRectF().centerX(),  getRectF().centerY());		animation.setDuration(5000);		animation.setInterpolator(new DecelerateInterpolator());//		animation.setRepeatCount(-1);		circle.setAnimation(animation );//		animation.start();		setContentView(circle);	}	public RectF getRectF(){		if (rect==null){//			getWindow().getDecorView().getWidth()			int width = getResources().getDisplayMetrics().widthPixels;			int height = getResources().getDisplayMetrics().heightPixels;			int top = (height - radius)/2;			int left = (width - radius)/2;			rect = new RectF(left, top, left+radius, top+radius);		}		return rect;	}}

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