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);
  }

}

/**
   * 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);