Android实现可点击的幸运大转盘

/**
 *
 *
 * CircleMenuLayout.java
 *
 * @author wuxiaosu
 *
 */
public class CircleMenuLayout extends ViewGroup {
 /**
  * 布局的半径
  */
 private int mRadius;
 /**
  * 该容器内child item的默认尺寸
  */
 private static final float RADIO_DEFAULT_CHILD_DIMENSION = 1f;
 /**
  * 菜单的中心child的默认尺寸
  */
 private float RADIO_DEFAULT_CENTERITEM_DIMENSION = 1 / 3f;
 /**
  * 该容器的内边距,无视padding属性，如需边距请用该变量
  */
 private static final float RADIO_PADDING_LAYOUT = 1 / 12f;
 /**
  * 该容器的内边距,无视padding属性，如需边距请用该变量
  */
 private float mPadding;
 /**
  * 布局时的开始角度
  */
 private double mStartAngle = 0;
 /**
  * 菜单项的文本
  */
 private String[] mItemTexts;
 /**
  * 菜单项的图标
  */
 private int[] mItemImgs;

 /**
  * 菜单的个数
  */
 private int mMenuItemCount;

 private int mMenuItemLayoutId = R.layout.circle_menu_item;

 public CircleMenuLayout(Context context, AttributeSet attrs) {
  super(context, attrs);
  // 无视padding
  setPadding(0, 0, 0, 0);
 }

 /**
  * 设置布局的宽高，并策略menu item宽高
  */
 @Override
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
  /**
   * 整个圆盘布局 的宽高
   */
  int resWidth = 0;
  int resHeight = 0;

  /**
   * 根据传入的参数，分别获取测量模式和测量值ֵ
   */
  int width = MeasureSpec.getSize(widthMeasureSpec);
  int widthMode = MeasureSpec.getMode(widthMeasureSpec);

  int height = MeasureSpec.getSize(heightMeasureSpec);
  int heightMode = MeasureSpec.getMode(heightMeasureSpec);

  /**
   * 如果宽或者高的测量模式非精确值ֵ
   */
  if (widthMode != MeasureSpec.EXACTLY
    || heightMode != MeasureSpec.EXACTLY) {
   // 主要设置为背景图的高度
   resWidth = getSuggestedMinimumWidth();
   // 如果未设置背景图片，则设置为屏幕宽高的默认值ֵ
   resWidth = resWidth == 0 ? getDefaultWidth() : resWidth;

   resHeight = getSuggestedMinimumHeight();
   // 如果未设置背景图片，则设置为屏幕宽高的默认值ֵ
   resHeight = resHeight == 0 ? getDefaultWidth() : resHeight;
  } else {
   // 如果都设置为精确值，则直接取小值；
   resWidth = resHeight = Math.min(width, height);
  }

  Log.e("TAG", "resWidth = " + resWidth + ", resHeight = " + resHeight);

  setMeasuredDimension(resWidth, resHeight);

  // 获得半径
  mRadius = Math.max(getMeasuredWidth(), getMeasuredHeight());

  // menu item数量
  final int count = getChildCount();
  // menu item尺寸
  int childSize = (int) (mRadius * RADIO_DEFAULT_CHILD_DIMENSION);
  Log.e("TAG", "childSize = " + childSize);
  // menu item测量模式
  int childMode = MeasureSpec.EXACTLY;

  // 迭代测量
  for (int i = 0; i < count; i++) {
   final View child = getChildAt(i);

   if (child.getVisibility() == GONE) {
    continue;
   }

   // 计算menu item的尺寸；以及和设置好的模式，去对item进行测量
   int makeMeasureSpec = -1;

   if (child.getId() == R.id.id_circle_menu_item_center) {
    makeMeasureSpec = MeasureSpec.makeMeasureSpec(
      (int) (mRadius * RADIO_DEFAULT_CENTERITEM_DIMENSION),
      childMode);
   } else {
    makeMeasureSpec = MeasureSpec.makeMeasureSpec(childSize,
      childMode);
   }
   child.measure(makeMeasureSpec, makeMeasureSpec);
  }

  mPadding = RADIO_PADDING_LAYOUT * mRadius;

 }

 /**
  * MenuItem的点击事件接口
  * 
  * 
  */
 public interface OnMenuItemClickListener {
  void itemClick(View view, int pos);

  void itemCenterClick(View view);
 }

 /**
  * MenuItem的点击事件接口
  */
 private OnMenuItemClickListener mOnMenuItemClickListener;

 /**
  * 设置MenuItem的点击事件接口
  * 
  * @param mOnMenuItemClickListener
  */
 public void setOnMenuItemClickListener(
   OnMenuItemClickListener mOnMenuItemClickListener) {
  this.mOnMenuItemClickListener = mOnMenuItemClickListener;
 }

 /**
  * 设置menu item的位置
  */
 @SuppressLint("NewApi")
 @Override
 protected void onLayout(boolean changed, int l, int t, int r, int b) {
  int layoutRadius = mRadius;
  Log.e("TAG", "layoutRadius = " + layoutRadius);

  // Laying out the child views
  final int childCount = getChildCount();

  int left, top;
  // menu item 的尺寸
  int cWidth = (int) (layoutRadius * RADIO_DEFAULT_CHILD_DIMENSION);

  // 根据menu item的个数，计算角度
  float angleDelay = 0;
  if ((getChildCount() - 1) != 0) {
   angleDelay = 360 / (getChildCount() - 1);
  }
  angleDelay = 30f;
  Log.e("TAG", "单个角度 angleDelay = " + angleDelay);

  // 遍历去设置menuitem的位置
  for (int i = 0; i < childCount; i++) {
   final View child = getChildAt(i);

   if (child.getId() == R.id.id_circle_menu_item_center)
    continue;

   if (child.getVisibility() == GONE) {
    continue;
   }

   mStartAngle %= 360;

   // 计算，中心点到menu item中心的距离--即图片中心位置到圆心的距离
   float tmp = layoutRadius / 2f - cWidth / 2 - mPadding;
   // 根据屏幕密度计算，基数为60(暂定60)
   tmp = LuckyUtil.getDensity() * 57;
   Log.e("TAG", "tmp = " + tmp);

   // tmp cosa 即menu item中心点的横坐标
   left = layoutRadius
     / 2
     + (int) Math.round(tmp
       * Math.cos(Math.toRadians(mStartAngle)) - 1 / 2f
       * cWidth);
   // tmp sina 即menu item的纵坐标
   top = layoutRadius
     / 2
     + (int) Math.round(tmp
       * Math.sin(Math.toRadians(mStartAngle)) - 1 / 2f
       * cWidth);

   child.layout(left, top, left + cWidth, top + cWidth);
   // 叠加尺寸
   mStartAngle += angleDelay;
  }

  // 找到中心的view，如果存在设置onclick事件
  View cView = findViewById(R.id.id_circle_menu_item_center);
  if (cView != null) {
   cView.setOnClickListener(new OnClickListener() {
    @SuppressLint("DrawAllocation")
    @Override
    public void onClick(View v) {

     if (mOnMenuItemClickListener != null) {
      mOnMenuItemClickListener.itemCenterClick(v);
     }
    }
   });
   // 设置center item位置
   int cl = layoutRadius / 2 - cView.getMeasuredWidth() / 2;
   int cr = cl + cView.getMeasuredWidth();
   cView.layout(cl, cl, cr, cr);
  }

 }

 /**
  * 主要为了action_down时，返回true
  */
 @Override
 public boolean onTouchEvent(MotionEvent event) {
  return true;
 }

 /**
  * 设置菜单条目的图标和文本
  * 
  * @param resIds
  */
 public void setMenuItemIconsAndTexts(int[] resIds, String[] texts) {
  mItemImgs = resIds;
  mItemTexts = texts;

  // 参数检查
  if (resIds == null && texts == null) {
   throw new IllegalArgumentException("菜单项文本和图片至少设置其一");
  }

  // 初始化mMenuCount
  mMenuItemCount = resIds == null ? texts.length : resIds.length;

  if (resIds != null && texts != null) {
   mMenuItemCount = Math.min(resIds.length, texts.length);
  }

  addMenuItems();

 }

 /**
  * 设置MenuItem的布局文件，必须在setMenuItemIconsAndTexts之前调用
  * 
  * @param mMenuItemLayoutId
  */
 public void setMenuItemLayoutId(int mMenuItemLayoutId) {
  this.mMenuItemLayoutId = mMenuItemLayoutId;
 }

 /**
  * 添加菜单项
  */
 @SuppressLint("NewApi")
 private void addMenuItems() {
  LayoutInflater mInflater = LayoutInflater.from(getContext());

  /**
   * 根据用户设置的参数，初始化view
   */
  for (int i = 0; i < mMenuItemCount; i++) {
   final int j = i;
   View view = mInflater.inflate(mMenuItemLayoutId, this, false);
   ImageView iv = (ImageView) view
     .findViewById(R.id.id_circle_menu_item_image);

   if (iv != null) {
    iv.setVisibility(View.VISIBLE);
    iv.setImageResource(mItemImgs[i]);
    iv.setOnClickListener(new OnClickListener() {
     @Override
     public void onClick(View v) {

      if (mOnMenuItemClickListener != null) {
       mOnMenuItemClickListener.itemClick(v, j);
      }
     }
    });
   }

   // 设置角度
   view.setRotation(90 + i * (360 / (mMenuItemCount)));

   Log.e("TAG", "旋转角度 = " + (i * (360 / mMenuItemCount)));

   // 添加view到容器中
   addView(view);
  }
 }

 /**
  * 获得默认该layout的尺寸
  * 
  * @return
  */
 private int getDefaultWidth() {
  WindowManager wm = (WindowManager) getContext().getSystemService(
    Context.WINDOW_SERVICE);
  DisplayMetrics outMetrics = new DisplayMetrics();
  wm.getDefaultDisplay().getMetrics(outMetrics);
  return Math.min(outMetrics.widthPixels, outMetrics.heightPixels);
 }

}

 <com.zhcl.yqwan.lucky.rotation.circle.CircleMenuLayout
      android:id="@+id/id_menulayout"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_gravity="center"
      android:background="@drawable/ratote_bg_two" >

      <RelativeLayout
       android:id="@+id/id_circle_menu_item_center"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:visibility="gone" >
   </RelativeLayout>
</com.zhcl.yqwan.lucky.rotation.circle.CircleMenuLayout>

/**
  * 设置属性或者星座的图片，并绘制图形
  * 
  * @param def
  * @param img
  * @param selectedImg
  * @param str
  * @param type
  *   :区分星座和生肖，1--星座，2--生肖。
  */
 private void setRotateSelectedImg(final int[] def, final int[] img,
   final int[] selectedImg, String[] str, final int type) {
  mCircleMenuLayout.setMenuItemIconsAndTexts(def, str);

  mCircleMenuLayout
    .setOnMenuItemClickListener(new OnMenuItemClickListener() {

     @Override
     public void itemClick(View view, int pos) {
      // 如果是第一次进来，将之前默认选中的item改变为原来的颜色
      // 如果选中的index和默认的index不同，则将默认的设置为原来的颜色
      // Toast.makeText(LotteryRotationActivity.this,
      // "pos = " + pos, Toast.LENGTH_SHORT).show();

      // 选中的index
      selectedIndex = pos;

      if (pos != 0 && type == 1) {
       img[0] = mConstellationImgs[0];
      } else if (pos != 0 && type == 2) {
       img[0] = mAnimalImgs[0];
      }

      mCircleMenuLayout.removeAllViews();
      // mCircleMenuLayout = (CircleMenuLayout)
      // findViewById(R.id.id_menulayout);
      // 替换选中的图片
      replaceImg = img[pos];
      img[pos] = selectedImg[pos];
      // 设置图片
      mCircleMenuLayout.setMenuItemIconsAndTexts(img,
        mItemTexts);
      // 还原图片，方便下一次点击替换
      img[pos] = replaceImg;
     }

     @Override
     public void itemCenterClick(View view) {

     }
    });

 }


// 星座:最开始默认选择一个
  setRotateSelectedImg(mConstellationImgsDefult, mConstellationImgs,
    mConstellationImgsSelected, mAnimalStr, 1);