Android 自定义组件卫星菜单的实现

<?xml version="1.0" encoding="utf-8"?>
<resources>
  <!-- 位置属性-->
  <attr name="position">
    <enum name="left_top" value="0" />
    <enum name="left_bottom" value="1" />
    <enum name="right_top" value="2" />
    <enum name="right_bottom" value="3" />
  </attr>

  <!-- 尺寸属性dp如果使用px可能会造成屏幕适配问题-->
  <attr name="radius" format="dimension" />
  <!-- 自定义属性-->
  <declare-styleable name="ArcMenu">

    <attr name="position" />
    <attr name="radius" />


  </declare-styleable>


</resources>

package com.lanou.dllo.arcmenudemo.arcmenu;

import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.util.Log;
import android.util.TypedValue;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.AnimationSet;
import android.view.animation.RotateAnimation;
import android.view.animation.ScaleAnimation;
import android.view.animation.TranslateAnimation;

import com.lanou.dllo.arcmenudemo.R;

/**
 * Created by dllo on 16/3/25.
 * 1.首先ArcMenu是继承ViewGroup,那么一个卫星菜单包括一个大按钮和其他的子按钮群.
 */

public class ArcMenu extends ViewGroup implements View.OnClickListener {

  //设置常量,标识成枚举
  private static final int POS_LEFT_TOP = 0;
  private static final int POS_LEFT_BOTTOM = 1;
  private static final int POS_RIGHT_TOP = 2;
  private static final int POS_RIGHT_BOTTOM = 3;

  //以下5个成员变量是所需要的.
  //声明两个属性 位置 还有半径
  private Position mPosition = Position.RIGHT_BOTTOM;
  private int mRadius;

  /**
   * 菜单的状态
   */
  private Status mCurrentStatus = Status.CLOSE;

  /**
   * 菜单的主按钮
   */
  private View mCButton;

  //子菜单的回调按钮
  private OnMenuItemClickListener mMenuItemClickListener;


  /**
   * 菜单的位置枚举类,4个位置
   */
  public enum Position {
    LEFT_TOP, LEFT_BOTTOM, RIGHT_TOP, RIGHT_BOTTOM
  }

  public enum Status {
    OPEN, CLOSE
  }

  /**
   * 点击子菜单项,顺便把位置传递过去
   */
  public interface OnMenuItemClickListener {
    void onClick(View view, int pos);
  }

  //3个构造方法,相互传递.
  //注意别写错误.
  public ArcMenu(Context context) {
    this(context, null);
  }

  public ArcMenu(Context context, AttributeSet attrs) {
    this(context, attrs, 0);
  }

  public ArcMenu(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    //TypedValue.applyDimension是转变标准尺寸的方法 参数一:单位  参数二:默认值 参数三:可以获取当前屏幕的分辨率信息.
    mRadius = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP
        , 100, getResources().getDisplayMetrics());

    //获取自定义属性的值
    //参数1:attrs AttributeSet是节点的属性集合
    //参数2:attrs的一个数组集
    //参数3:指向当前theme 某个item 描述的style 该style指定了一些默认值为这个TypedArray
    //参数4;当defStyleAttr 找不到或者为0， 可以直接指定某个style
    TypedArray a = context.getTheme().obtainStyledAttributes(attrs,
        R.styleable.ArcMenu, defStyleAttr, 0);
    int pos = a.getInt(R.styleable.ArcMenu_position, POS_RIGHT_BOTTOM);
    switch (pos) {
      case POS_LEFT_TOP:
        mPosition = Position.LEFT_TOP;
        break;
      case POS_LEFT_BOTTOM:
        mPosition = Position.LEFT_BOTTOM;
        break;
      case POS_RIGHT_TOP:
        mPosition = Position.RIGHT_TOP;
        break;
      case POS_RIGHT_BOTTOM:
        mPosition = Position.RIGHT_BOTTOM;
        break;
    }

    mRadius = (int) a.getDimension(R.styleable.ArcMenu_radius,
        TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP
            , 100, getResources().getDisplayMetrics()));

    Log.d("TAG", "Position = " + mPosition + ", radius" + mRadius);
    //使用完必须回收.
    a.recycle();

  }

  public void setOnMenuItemClickListener(OnMenuItemClickListener mMenuItemClickListener) {
    this.mMenuItemClickListener = mMenuItemClickListener;
  }

  /**
   * 测量方法
   */
  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    int count = getChildCount();
    for (int i = 0; i < count; i++) {
      //测量child的各个属性.
      measureChild(getChildAt(i), widthMeasureSpec, heightMeasureSpec);
    }
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
  }

  @Override
  protected void onLayout(boolean changed, int l, int t, int r, int b) {
    if (changed) {
      layoutCButton();
      //获得容器内组件的个数,并且包括这个主的组件(大按钮)
      int count = getChildCount();
      for (int i = 0; i < count - 1; i++) {
        //这里直接获取第一个,是因为getChildAt(0)是红色的按钮.
        View child = getChildAt(i + 1);
        //正常来说,如果设置按钮动画,移动出去后,是不能点击的,这里给按钮设置一个隐藏的属性.等卫星菜单飞过去,在让它们显示出来.
        child.setVisibility(View.GONE);
        /**
         * 根据画图分析,得出每个子卫星按钮的夹角 a = 90°/(菜单的个数-1)
         * 假设menu总数为4,那么从左侧数menu1的坐标为(0,R);
         * menu2的坐标为(R*sin(a),R*cos(a));
         * menu3的坐标为(R*sin(2a),R*cos(2a));
         * ...
         * menuN的坐标为(R,0);
         * 另:PI为π
         * */
        //测量每个子卫星组件的在屏幕上面的坐标距离
        //这里count-2,是因为count包含了主按钮
        //每个组件的坐标为(cl,ct);
        int cl = (int) (mRadius * Math.sin(Math.PI / 2 / (count - 2) * i));
        int ct = (int) (mRadius * Math.cos(Math.PI / 2 / (count - 2) * i));

        int cWidth = child.getMeasuredWidth();
        int cHeight = child.getMeasuredHeight();

        //如果卫星菜单存在于底部,那么坐标位置的计算方法,就完全相反.
        /**
         * 如果菜单位置在底部 左下 ,右下.坐标会发生变化
         * */
        if (mPosition == Position.LEFT_BOTTOM || mPosition == Position.RIGHT_BOTTOM) {
          ct = getMeasuredHeight() - cHeight - ct;
        }

        /**
         * 右上,右下
         * */
        if (mPosition == Position.RIGHT_TOP || mPosition == Position.RIGHT_BOTTOM) {
          cl = getMeasuredWidth() - cWidth - cl;
        }


        //子布局的测量坐标;
        child.layout(cl, ct, cl + cWidth, ct + cHeight);


      }
    }

  }

  /**
   * 定位主菜单按钮
   */
  private void layoutCButton() {
    // 给主按钮设置监听
    mCButton = getChildAt(0);
    mCButton.setOnClickListener(this);

    //分别代表控件所处离左侧和上侧得距离
    int l = 0;
    int t = 0;
    int width = mCButton.getMeasuredWidth();
    int height = mCButton.getMeasuredHeight();

    /**
     * getMeasuredHeight()如果前面没有对象调用,那么这个控件继承ViewGroup,就意味着这是获取容器的总高度.
     * getMeasuredWidth()也是同理.
     * 那么就可以判断出控件在四个位置(根据坐标系判断.)
     * */
    switch (mPosition) {
      case LEFT_TOP:
        l = 0;
        t = 0;
        break;
      case LEFT_BOTTOM:
        l = 0;
        t = getMeasuredHeight() - height;
        break;
      case RIGHT_TOP:
        l = getMeasuredWidth() - width;
        t = 0;
        break;
      case RIGHT_BOTTOM:
        l = getMeasuredWidth() - width;
        t = getMeasuredHeight() - height;
        break;
    }

    //layout的四个属性.分别代表主按钮在不同位置距离屏幕左侧和上侧
    mCButton.layout(l, t, l + width, t + height);

  }


  @Override
  public void onClick(View v) {
    //主要确定mCButton的值
    mCButton = findViewById(R.id.id_button);
    if (mCButton == null) {
      mCButton = getChildAt(0);
    }

    //旋转动画
    rotateCButton(v, 0f, 360f, 300);
    //判断菜单是否关闭,如果菜单关闭需要给菜单展开,如果菜单是展开的需要给菜单关闭.
    toggleMenu(500);
  }

  /**
   * 切换菜单
   * 参数:切换菜单的时间是可控的.
   */
  public void toggleMenu(int duration) {
    //为所有子菜单添加动画. :平移动画丶旋转动画
    int count = getChildCount();
    for (int i = 0; i < count - 1; i++) {
      /**
       * 默认位置左上的话,子菜单起始坐标点为(-cl,-ct);
       *   位置右上的话,子菜单起始坐标点为(+cl,-ct);
       *   位置左下的话,子菜单起始坐标点为(-cl,+ct);
       *   位置右下的话,子菜单起始坐标点为(+cl,+ct);**
       * */
      final View childView = getChildAt(i + 1);
      //不管按钮是开还是关,子菜单必须显示才能出现动画效果.
      childView.setVisibility(View.VISIBLE);
      //平移 结束为止 0,0(以子菜单按钮当前位置,为坐标系.)
      int cl = (int) (mRadius * Math.sin(Math.PI / 2 / (count - 2) * i));
      int ct = (int) (mRadius * Math.cos(Math.PI / 2 / (count - 2) * i));

      //创建两个判断变量,判别起始位置.
      int xflag = 1;
      int yflag = 1;
      if (mPosition == Position.LEFT_TOP
          || mPosition == Position.LEFT_BOTTOM) {
        xflag = -1;
      }
      if (mPosition == Position.LEFT_TOP
          || mPosition == Position.RIGHT_TOP) {
        yflag = -1;
      }
      //多个动画同时使用使用,用到AnimationSet
      AnimationSet animset = new AnimationSet(true);
      Animation tranAnim = null;

      //to open 打开的情况下
      if (mCurrentStatus == Status.CLOSE) {
        tranAnim = new TranslateAnimation(xflag * cl, 0, yflag * ct, 0);
        //当卫星菜单打开的时候,按钮就可以进行点击.
        childView.setClickable(true);
        childView.setFocusable(true);

      } else {//to close
        tranAnim = new TranslateAnimation(0, xflag * cl, 0, yflag * ct);
        //当卫星菜单关闭的时候,按钮也不能随之点击.
        childView.setClickable(false);
        childView.setFocusable(false);
      }
      tranAnim.setFillAfter(true);
      tranAnim.setDuration(duration);
      //设置弹出速度.
      tranAnim.setStartOffset((i * 100) / count);
      //为动画设置监听 如果需要关闭的话,在动画结束的同时,需要将子菜单的按钮全部隐藏.
      tranAnim.setAnimationListener(new Animation.AnimationListener() {
        @Override
        public void onAnimationStart(Animation animation) {

        }

        //在动画结束时,进行设置.
        @Override
        public void onAnimationEnd(Animation animation) {
          if (mCurrentStatus == Status.CLOSE) {
//            Log.d("动画结束状态",mCurrentStatus +"");
            childView.setVisibility(View.GONE);
          }
        }

        @Override
        public void onAnimationRepeat(Animation animation) {

        }
      });

      //设置旋转动画(转两圈)
      RotateAnimation rotateAnim = new RotateAnimation(0, 720,
          Animation.RELATIVE_TO_SELF, 0.5f,
          Animation.RELATIVE_TO_SELF, 0.5f);
      rotateAnim.setDuration(duration);
      rotateAnim.setFillAfter(true);

      //把两个动画放到动画集里面
      //注意动画顺序.先增加旋转/在增加移动./
      animset.addAnimation(rotateAnim);
      animset.addAnimation(tranAnim);
      childView.startAnimation(animset);

      final int pos = i + 1;
      //设置子菜单的点击事件
      childView.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
          if (mMenuItemClickListener != null) {
            mMenuItemClickListener.onClick(childView, pos);
          }
            menuItemAnim(pos - 1);
            //切换菜单状态
            changeStatus();
        }
      });
    }
    /**
     * 当所有子菜单切换完成后,那么菜单的状态也发生了改变.
     * 所以changeStatus()必须放在循环外,
     * */
    //切换菜单状态
    changeStatus();

  }


  /**
   * 切换菜单状态
   */
  private void changeStatus() {
    //在执行一个操作之后,如果按钮是打开的在次点击就会切换状态.
    mCurrentStatus = (mCurrentStatus == Status.CLOSE ? Status.OPEN :
        Status.CLOSE);
    Log.d("动画结束状态", mCurrentStatus + "");
  }

  public boolean isOpen(){
    return mCurrentStatus ==Status.OPEN;
  }




  //设置旋转动画绕自身旋转一圈 然后持续时间为300
  private void rotateCButton(View v, float start, float end, int duration) {
    RotateAnimation anim = new RotateAnimation(start, end, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
    anim.setDuration(duration);
    //保持动画旋转后的状态.
    anim.setFillAfter(true);
    v.startAnimation(anim);
  }

  /**
   * 添加menuItem的点击动画
   * */
  private void menuItemAnim(int pos) {
    for (int i = 0; i < getChildCount() - 1; i++) {
      View childView = getChildAt(i + 1);
      //在判断条件下,写入动画
      //当其中一个子菜单被点击后,自身变大并且消失
      //其他子菜单则变小消失.
      if (i == pos) {
        childView.startAnimation(scaleBigAnim(300));
      } else {
        childView.startAnimation(scaleSmallAnim(300));
      }

      //当子菜单被点击之后,其他子菜单就要变成不可被点击和获得焦点的状态,
      childView.setClickable(false);
      childView.setFocusable(false);
    }
  }

  /**
   * 为当前点击的Item设置变大和透明度降低的动画
   *
   * @param duration
   * @return
   */
  private Animation scaleBigAnim(int duration) {
    AnimationSet animationSet = new AnimationSet(true);
    ScaleAnimation scaleAnimation = new ScaleAnimation(1.0f, 4.0f, 1.0f, 4.0f,
        Animation.RELATIVE_TO_SELF, 0.5f,
        Animation.RELATIVE_TO_SELF, 0.5f);
    AlphaAnimation alphaAnimation=new AlphaAnimation(1f,0.0f);

    animationSet.addAnimation(scaleAnimation);
    animationSet.addAnimation(alphaAnimation);

    animationSet.setDuration(duration);
    animationSet.setFillAfter(true);
    return animationSet;
  }

  private Animation scaleSmallAnim(int duration) {
    AnimationSet animationSet = new AnimationSet(true);
    ScaleAnimation scaleAnimation = new ScaleAnimation(1.0f, 0.0f, 1.0f, 0.0f,
        Animation.RELATIVE_TO_SELF, 0.5f,
        Animation.RELATIVE_TO_SELF, 0.5f);
    AlphaAnimation alphaAnimation=new AlphaAnimation(1f,0.0f);
    animationSet.addAnimation(scaleAnimation);
    animationSet.addAnimation(alphaAnimation);
    animationSet.setDuration(duration);
    animationSet.setFillAfter(true);
    return animationSet;
  }

}

<?xml version="1.0" encoding="utf-8"?>
<com.lanou.dllo.arcmenudemo.arcmenu.ArcMenu xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  xmlns:arcmenu="http://schemas.android.com/apk/res/com.lanou.dllo.arcmenudemo"
  xmlns:tools="http://schemas.android.com/tools"
  android:id="@+id/id_menu"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  arcmenu:position="left_top"
  arcmenu:radius="140dp"
>


    <!-- 主按钮-->
    <RelativeLayout
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:background="@mipmap/composer_button">

      <ImageView
        android:id="@+id/id_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:src="@mipmap/composer_icn_plus" />
    </RelativeLayout>


    <ImageView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:src="@mipmap/composer_camera"
      android:tag="Camera"/>

    <ImageView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:src="@mipmap/composer_music"
      android:tag="Music"/>

    <ImageView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:src="@mipmap/composer_place"
      android:tag="Place"/>

    <ImageView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:src="@mipmap/composer_sleep"
      android:tag="Sleep"/>

    <ImageView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:src="@mipmap/composer_thought"
      android:tag="Sun"/>

    <ImageView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:src="@mipmap/composer_with"
      android:tag="People"/>

</com.lanou.dllo.arcmenudemo.arcmenu.ArcMenu>