Android 仿酷点圆形菜单

看见一个人写了一个圆形的可以转的菜单，当时看的还是挺模糊的，最后自己模仿的写了一遍，这是源代码

基本思想是这样的

1，把每个图标显示的什么图标确定下来

2，计算每一个点的坐标，

3，在activity就可以正确显示出了

4，当我们移动图标的时候，计算出移动后的图标的角度，知道角度和半径就可以设置它的坐标啊，以它为起始图标，画出剩下的图标

5，实在很模糊，不理解的再议论

启动的Activity

import android.app.Activity;
import android.os.Bundle;

public class Main extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(new CircleMenuActivity(getApplicationContext(), 150, 150, 100));
    }
}

菜单生成的类

package rw.circle;


import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;

public class CircleMenuActivity extends View {

private Paint paint=new Paint();
private SeeView[] seeViews;
private static final int MenuCount=6;//桌面图标的个数
private int pointX=0,pointY=0;//圆心坐标
private static final int radius=150;//半径
private int DegreeOfPoint;//两个点之间的角度
	public CircleMenuActivity(Context context, int x, int y,int radiu) {
		super(context);
		paint.setColor(Color.GREEN);
		paint.setStrokeWidth(2);
		setBackgroundResource(R.drawable.tt1);
		pointX=x;
		pointY=y;
		radiu=radius;
		SetPoint();
		CalculateCoordinate();
		// TODO Auto-generated constructor stub
	}
	/*
	 * 这个函数是设置每一个点
	 */
   private void SetPoint() {
		// TODO Auto-generated method stub
		seeViews=new SeeView[MenuCount];
		//SeeView seeView;
		int angle=0;
		DegreeOfPoint=360/MenuCount;
		for (int i = 0; i <MenuCount; i++) {
			seeViews[i]=new SeeView();
			seeViews[i].angle=angle;
			seeViews[i].bitmap=BitmapFactory.decodeResource(getResources(),R.drawable.t1+i);
			angle+=DegreeOfPoint;
		}
	}
   private void resetPointAngle(float x,float y){
	   int angle=CalculateAngle(x, y);
	   for (int i = 0; i < MenuCount; i++) {
		seeViews[i].angle=angle;
		angle+=DegreeOfPoint;
	}
   }
   //计算坐标
   private void CalculateCoordinate(){
	   SeeView seeView;
	   for (int i = 0; i < MenuCount; i++) {
		seeView=seeViews[i];
		seeView.x=pointX+(float)(radius*Math.cos(seeView.angle*Math.PI/180));
		seeView.y=pointY+(float)(radius*Math.sin(seeView.angle*Math.PI/180));
	}
   }
   private int CalculateAngle(float x,float y) {
    float distance=(float)Math.sqrt((x-pointX)*(x-pointX)+(y-pointY)*(y-pointY));
    int degree=(int)(Math.acos((x-pointX)/distance)*180/Math.PI);
    if (y<pointY) {
		degree=-degree;
	}
    return degree;
}
   
	public boolean dispatchTouchEvent(MotionEvent event) {
		// TODO Auto-generated method stub
		//Animation animation;
		//animation=AnimationUtils.loadAnimation(getContext(), R.anim.scale);
		resetPointAngle(event.getX(), event.getY());
		CalculateCoordinate();  
		invalidate();
		return true;
	}
	
	
	protected void onDraw(Canvas canvas) {
		// TODO Auto-generated method stub
		canvas.drawPoint(pointX, pointY, paint);
		for (int i = 0; i < MenuCount; i++) {
			if (!seeViews[i].isVisible) 
				continue;
			drawIncenter(canvas, seeViews[i].bitmap, seeViews[i].x, seeViews[i].y);
		}
		super.onDraw(canvas);
	}
	
private void drawIncenter(Canvas canvas,Bitmap bitmap,float left,float top)
{
	canvas.drawPoint(left, top, paint);
	Log.i("-------->", left+"");
	Log.i("----------------->", bitmap.getWidth()/2+"");
	Log.i("----------------------->", left-bitmap.getWidth()/2+"");
	canvas.drawBitmap(bitmap, left+bitmap.getWidth()/2, top+bitmap.getHeight()/2,null);
}
private class SeeView{ 
	   Bitmap bitmap;//每个图标的图
	   float x,y;//每个图标的坐标
	   int angle;//角度
	   boolean isVisible=true;//是否可见，当然可见，要不怎么看见
   }
}