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 stubseeViews=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 stubcanvas.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   }}