Android实现弧形菜单效果

前言：公司需求，自己写的一个弧形菜单！

效果：

开发环境：AndroidStudio2.2.1+gradle-2.14.1

涉及知识：1.自定义控件，2.事件分发等

部分代码：

public class HomePageMenuLayout extends ViewGroup {
 private Context context;
 // 菜单项的文本
 private String[] mItemTexts = null;
 private int StatusHeight;//状态栏高度
 public HomePageMenuLayout(Context context, AttributeSet attrs) {
 super(context, attrs);
 this.context = context;
 StatusHeight = ScreenUtils.getStatusHeight(context);
 }
 
 int resWidth = 0;
 int resHeight = 0;
 int mRadius = 0;
 @Override
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
 //布局宽高尺寸设置为屏幕尺寸
 //设置该布局的大小
 setMeasuredDimension(widthMeasureSpec, heightMeasureSpec);
 
 int width = MeasureSpec.getSize(widthMeasureSpec);
 resHeight = MeasureSpec.getSize(heightMeasureSpec);
 resWidth = MeasureSpec.getSize(widthMeasureSpec);
 // 获得半径
 mRadius = (int) (resHeight / 2 - 2 * StatusHeight);
 //设置item尺寸
 int childSize = (int) (mRadius * 1 / 2);
 // menu item测量模式--精确模式
 int childMode = MeasureSpec.EXACTLY;
 for (int i = 0; i < getChildCount(); 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;
 makeMeasureSpec = MeasureSpec.makeMeasureSpec(childSize, childMode);
 child.measure(makeMeasureSpec, makeMeasureSpec);
 }
 }
 
 private int[] widthall = null;
 
 @Override
 protected void onLayout(boolean changed, int l, int t, int r, int b) {
 int left, top;
 int cWidth = (int) (mRadius * 1 / 2);
 final int childCount = getChildCount();
 // 计算，中心点到menu item中心的距离
 float tmp = mRadius - cWidth / 2;
 // 遍历去设置menuitem的位置
 for (int i = 0; i < childCount; i++) {
 final View child = getChildAt(i);
 if (child.getVisibility() == GONE) {
 continue;
 }
 left = (int) (mRadius * Math.cos(Math.toRadians(widthall[i]))) - 65;
 top = (int) (mRadius - (resHeight / 2 - 2 * StatusHeight) * Math.sin(Math.toRadians(widthall[i])) - StatusHeight);
 child.layout(left, top, left + cWidth, top + cWidth);
 }
 }
 public interface onMenuItemClickListener {
 void itemClick(View view, int pos);
 }
 public void setonMenuItemClickListener(
 onMenuItemClickListener mOnMenuItemClickListener) {
 this.monMenuItemClickListener = mOnMenuItemClickListener;
 }
 // 菜单的个数
 private int mMenuItemCount;
 
 public void setMenuItemIconsAndTexts(String[] mItemTexts) {
 this.mItemTexts = mItemTexts;
 this.mMenuItemCount = mItemTexts.length;
 resultAngle();
 addMenuItems();
 }
 private void resultAngle() {
 switch (this.mMenuItemCount) {
 case 3:
 widthall = Constants.ITEM3;
 break;
 case 4:
 widthall = Constants.ITEM4;
 break;
 case 5:
 widthall = Constants.ITEM5;
 break;
 case 6:
 widthall = Constants.ITEM6;
 break;
 case 7:
 widthall = Constants.ITEM7;
 break;
 case 8:
 widthall = Constants.ITEM8;
 break;
 case 9:
 widthall = Constants.ITEM9;
 break;
 case 10:
 widthall = Constants.ITEM10;
 break;
 default:
 break;
 }
 }
 
 public void setMenuItemIconsAndTexts() {
 addMenuItems();
 }
 private int mMenuItemLayoutId = R.layout.homepage_item_layout;
 
 private onMenuItemClickListener mOnMenuItemClickListener;
 private float yPosition = 0;
 
 private void addMenuItems() {
 LayoutInflater mInflater = LayoutInflater.from(getContext());
 
 for (int i = 0; i < mMenuItemCount; i++) {
 final int j = i;
 View view = mInflater.inflate(mMenuItemLayoutId, this, false);

 final ImageView iv = (ImageView) view
  .findViewById(R.id.homepage_pager1_item_img);
 final TextView tv = (TextView) view
  .findViewById(R.id.homepage_pager1_item_tv);
 if (iv != null) {
 iv.setImageResource(R.mipmap.menu_ture);
 }
 if (tv != null) {
 tv.setText(mItemTexts[i]);
 }
 view.findViewById(R.id.homepage_item_layout).setonClickListener(new onClickListener() {
 @Override
 public void onClick(View v) {}
 });
 view.findViewById(R.id.homepage_item_layout).setonTouchListener(new onTouchListener() {
 @Override
 public boolean onTouch(View v, MotionEvent event) {
  if (event.getAction() == MotionEvent.ACTION_DOWN) {
  yPosition = event.getY();//获取按下的位置
  iv.setImageResource(R.mipmap.menu);
  } else if (event.getAction() == MotionEvent.ACTION_UP) {
  iv.setImageResource(R.mipmap.menu_ture);
  float displacement = Math.abs(yPosition - event.getY());
  //精确按下的位置做出响应
  if (monMenuItemClickListener != null&&displacement<25) {
  mOnMenuItemClickListener.itemClick(v,j);
  }
  } else if (event.getAction() == MotionEvent.ACTION_CANCEL || event.getAction() == MotionEvent.ACTION_POINTER_UP) {
  iv.setImageResource(R.mipmap.menu_ture);
  }
  return true;
 }
 });
 addView(view);
 }
 }
}

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