android---转轮菜单

效果：

使用了自定义布局实现触摸旋转功能

1.创建item布局circle_menu_item.xml

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:orientation="vertical">
    <!--圆盘菜单图标-->
    <ImageView
        android:id="@+id/id_circle_menu_item_image"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:visibility="gone" />
    <!--圆盘菜单文字-->
    <TextView
        android:id="@+id/id_circle_menu_item_text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="@android:color/white"
        android:textSize="14.0dip"
        android:visibility="gone" />
</LinearLayout>

2.创建CricleMenuLayout自定义view

public class CricleMenuLayout extends ViewGroup {
    private int mRadius;
    /**
     * 该容器内child item的默认尺寸
     */
    private static final float RADIO_DEFAULT_CHILD_DIMENSION = 1 / 4f;
    /**
     * 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;

    /**
     * 当每秒移动角度达到该值时，认为是快速移动
     */
    private static final int FLINGABLE_VALUE = 300;

    /**
     * 如果移动角度达到该值，则屏蔽点击
     */
    private static final int NOCLICK_VALUE = 3;
    /**
     * 当每秒移动角度达到该值时，认为是快速移动
     */
    private int mFlingableValue = FLINGABLE_VALUE;
    /**
     * 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;
    /**
     * 检测按下到抬起时旋转的角度
     */
    private float mTmpAngle;
    /**
     * 检测按下到抬起时使用的时间
     */
    private long mDownTime;

    /**
     * 判断是否正在自动滚动
     */
    private boolean isFling;

    private int mMenuItemLayoutId = R.layout.circle_menu_item;//单个按钮布局

    public CricleMenuLayout(Context context, AttributeSet attrs)

    {
        super(context, attrs);
        // 无视边距
        setPadding(0, 0, 0, 0);
    }

    /**
     * 设置圆盘布局的宽高，并设置菜单按钮宽高
     */
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        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);
        }
        setMeasuredDimension(resWidth, resHeight);//设置布局宽高
        // 获得半径
        mRadius = Math.max(getMeasuredWidth(), getMeasuredHeight());
        // 菜单按钮数量
        final int count = getChildCount();
        // 菜单按钮尺寸
        int childSize = (int) (mRadius * RADIO_DEFAULT_CHILD_DIMENSION);
        // 菜单按钮为精确模式
        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
     */
    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        int layoutRadius = mRadius;
        // 获取子布局
        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 = 360 / (getChildCount() - 1);
        // 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
            float tmp = layoutRadius / 2f - cWidth / 2 - mPadding;
            // 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() {
                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);
        }
    }

    /**
     * 记录上一次的x，y坐标
     */
    private float mLastX;
    private float mLastY;

    /**
     * 自动滚动的Runnable
     */
    private AutoFlingRunnable mFlingRunnable;

    /**
     * 菜单选择触摸监听 手指触摸事件
     */
    @Override
    public boolean dispatchTouchEvent(MotionEvent event) {
        float x = event.getX();
        float y = event.getY();
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:                   //手指按下事件
                mLastX = x;                                 //记录x坐标
                mLastY = y;                                 //记录y坐标
                mDownTime = System.currentTimeMillis();     //记录按下的时间
                mTmpAngle = 0;                              //记录按下到抬起时旋转的角度
                if (isFling) {                              // 如果当前已经在快速滚动
                    removeCallbacks(mFlingRunnable);       // 移除快速滚动的回调
                    isFling = false;                       //标记为没有快速滚动
                    return true;
                }
                break;
            case MotionEvent.ACTION_MOVE:                    //手指移动事件
                float start = getAngle(mLastX, mLastY);     //获得开始的角度
                float end = getAngle(x, y);                  //获得当前的角度
                // 如果是一、四象限，则直接end-start，角度值都是正值
                if (getQuadrant(x, y) == 1 || getQuadrant(x, y) == 4) {
                    mStartAngle += end - start;         //布局时的开始角度
                    mTmpAngle += end - start;           //按下到抬起时旋转的角度
                } else
                // 二、三象限，色角度值是负值
                {
                    mStartAngle += start - end;
                    mTmpAngle += start - end;
                }
                // 重新布局
                requestLayout();
                mLastX = x; //记录x坐标
                mLastY = y; //记录y坐标
                break;
            case MotionEvent.ACTION_UP://手指抬起事件
                // 计算，每秒移动的角度
                float anglePerSecond = mTmpAngle * 1000
                        / (System.currentTimeMillis() - mDownTime);
                // 如果达到该值认为是快速移动
                if (Math.abs(anglePerSecond) > mFlingableValue && !isFling)   {
                    // post一个任务，去自动滚动
                    post(mFlingRunnable = new AutoFlingRunnable(anglePerSecond));
                    return true;
                }
                // 如果当前旋转角度超过NOCLICK_VALUE屏蔽点击
                if (Math.abs(mTmpAngle) > NOCLICK_VALUE) {
                    return true;
                }
                break;
        }
        return super.dispatchTouchEvent(event);
    }


    /**
     * 根据触摸的位置，计算角度
     */
    private float getAngle(float xTouch, float yTouch) {
        double x = xTouch - (mRadius / 2d);
        double y = yTouch - (mRadius / 2d);
        return (float) (Math.asin(y / Math.hypot(x, y)) * 180 / Math.PI);
    }

    /**
     * 根据当前位置计算象限
     */
    private int getQuadrant(float x, float y) {
        int tmpX = (int) (x - mRadius / 2);
        int tmpY = (int) (y - mRadius / 2);
        if (tmpX >= 0) {
            return tmpY >= 0 ? 4 : 1;
        } else {
            return tmpY >= 0 ? 3 : 2;
        }
    }

    /**
     * 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();

    }

    /**
     * 添加菜单项
     */
    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);
            TextView tv = (TextView) view
                    .findViewById(R.id.id_circle_menu_item_text);

            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);
                        }
                    }
                });
            }
            if (tv != null) {
                tv.setVisibility(View.VISIBLE);
                tv.setText(mItemTexts[i]);
            }

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


    /**
     * 获得默认该layout的尺寸
     */
    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);
    }

    /**
     * 自动滚动的任务
     */
    private class AutoFlingRunnable implements Runnable {

        private float angelPerSecond;

        public AutoFlingRunnable(float velocity) {
            this.angelPerSecond = velocity;
        }

        public void run() {
            // 如果小于20,则停止
            if ((int) Math.abs(angelPerSecond) < 20) {
                isFling = false;
                return;
            }
            isFling = true;
            // 不断改变mStartAngle，让其滚动，/30为了避免滚动太快
            mStartAngle += (angelPerSecond / 30);
            // 逐渐减小这个值
            angelPerSecond /= 1.0666F;
            postDelayed(this, 30);
            // 重新布局
            requestLayout();
        }
    }
}

3.CricleMenuLayout的使用

先在布局中添加CricleMenuLayout：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/bg"
    android:gravity="center_vertical"
    android:orientation="vertical">
    <!--自定义圆盘菜单-->
    <com.example.criclemenudemo.CricleMenuLayout
        android:id="@+id/id_menulayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@drawable/circle_bg"
        android:padding="100dp">
        <!--圆盘中间位置布局-->
        <RelativeLayout
            android:id="@+id/id_circle_menu_item_center"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content">
            <!--指南针图片-->
            <ImageView
                android:id="@+id/iv_znz"
                android:layout_width="104.0dip"
                android:layout_height="104.0dip"
                android:layout_centerInParent="true"
                android:background="@drawable/znz" />
            <!--指南针外框-->
            <ImageView
                android:layout_width="116.0dip"
                android:layout_height="116.0dip"
                android:layout_centerInParent="true"
                android:background="@drawable/turnplate_mask_unlogin_normal" />
        </RelativeLayout>
    </com.example.criclemenudemo.CricleMenuLayout>
</LinearLayout>

菜单的实现：

public class MainActivity extends AppCompatActivity {

    private CricleMenuLayout mCircleMenuLayout;//自定义圆盘菜单
    private String[] mItemTexts = new String[]{"放大镜 ", "尺子", "分贝测试仪", "手电筒",
            "计算器", "SOS"};//圆盘菜单显示文字
    private int[] mItemImgs = new int[]{R.drawable.home_mbank_1_normal,
            R.drawable.home_mbank_2_normal, R.drawable.home_mbank_3_normal,
            R.drawable.home_mbank_4_normal, R.drawable.home_mbank_5_normal,
            R.drawable.home_mbank_6_normal};//圆盘菜单显示图片

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //初始化圆盘控件
        mCircleMenuLayout = (CricleMenuLayout) findViewById(R.id.id_menulayout);
        //初始化圆盘控件菜单
        mCircleMenuLayout.setMenuItemIconsAndTexts(mItemImgs, mItemTexts);
        //点击事件
        mCircleMenuLayout.setOnMenuItemClickListener(new CricleMenuLayout.OnMenuItemClickListener() {
            @Override
            public void itemClick(View view, int pos) {
                Toast.makeText(MainActivity.this,mItemTexts[pos],Toast.LENGTH_SHORT).show();
            }

            @Override
            public void itemCenterClick(View view) {

            }
        });
    }
}