android五星评级

package com.example.test;

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Path;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
/**
 * 
 * @author Young
 *
 */
public class FiveView2 extends View {

	private float position=-1;
	private Paint paint;
 
	
	public FiveView2(Context context) {
		super(context);
		init();
		 
	}

	

	public FiveView2(Context context, AttributeSet attrs) {
		super(context, attrs);
		init();
		 
	}

	public FiveView2(Context context, AttributeSet attrs, int defStyleAttr) {
		super(context, attrs, defStyleAttr);
		init();
		 
	}

	@SuppressLint("NewApi")
	public FiveView2(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
		super(context, attrs, defStyleAttr, defStyleRes);
		init();
		
	}

	private void init() {
		 paint=new Paint();
		paint.setAntiAlias(true);
		paint.setColor(Color.YELLOW);
		paint.setStrokeWidth(5);
	}
 

	@Override
	protected void onDraw(Canvas canvas) {
		super.onDraw(canvas);
		int width=getWidth()-getPaddingLeft()-getPaddingRight();
		float r=width/2.0f/5.0f;
		 
		float outR=r*0.9f;
		float inR=outR*sin(18)/sin(180-36-18);
		
		canvas.translate(getPaddingLeft()+r , getHeight()/2.0f );
		Path completePath = getCompletePath(outR, inR);
		Path halfPath = getHalfPath(outR, inR);
		
		for (int i =0; i < 5; i++) {
			
			canvas.rotate(-18);
			
			paint.setStyle(Style.STROKE);
			canvas.drawPath(completePath, paint);
			if (position-getPaddingLeft()<2*r*i) {
				
			}else if ((position-getPaddingLeft())<2*r*i+r) {
				paint.setStyle(Style.STROKE);
				canvas.drawPath(completePath, paint);
				
				paint.setStyle(Style.FILL);
				canvas.drawPath(halfPath, paint);
				
			}else{
				paint.setStyle(Style.FILL);
				canvas.drawPath(completePath, paint);
				
			}
			
			canvas.rotate(18);
			canvas.translate(2*r ,0 );
		}
		
	}

	
	@Override
	public boolean onTouchEvent(MotionEvent event) {
		position=event.getX();
		invalidate();
		return true;
	}
	private Path getHalfPath(float outR, float inR) {
		Path path;
		path=new Path();
		
		path.moveTo(outR*cos(72*4), outR*sin(72*4));
		
		path.lineTo(inR*cos(72*1+36), inR*sin(72*1+36));
		path.lineTo(outR*cos(72*2), outR*sin(72*2));
		path.lineTo(inR*cos(72*2+36), inR*sin(72*2+36));
		path.lineTo(outR*cos(72*3), outR*sin(72*3));
		path.lineTo(inR*cos(72*3+36), inR*sin(72*3+36));

		path.close();
		return path;
	}

	private Path getCompletePath(float outR, float inR) {
		Path path=new Path();
		
		path.moveTo(outR*cos(72*0), outR*sin(72*0));
		path.lineTo(inR*cos(72*0+36), inR*sin(72*0+36));
		path.lineTo(outR*cos(72*1), outR*sin(72*1));
		path.lineTo(inR*cos(72*1+36), inR*sin(72*1+36));
		path.lineTo(outR*cos(72*2), outR*sin(72*2));
		path.lineTo(inR*cos(72*2+36), inR*sin(72*2+36));
		path.lineTo(outR*cos(72*3), outR*sin(72*3));
		path.lineTo(inR*cos(72*3+36), inR*sin(72*3+36));
		path.lineTo(outR*cos(72*4), outR*sin(72*4));
		path.lineTo(inR*cos(72*4+36), inR*sin(72*4+36));
		path.close();
		return path;
	}
 

	 
	
	private float cos(int num){
		return (float) Math.cos(num*Math.PI/180);
	}
 
	private float sin(int num){
		return (float) Math.sin(num*Math.PI/180);
	}
}