Android 圆形滚动菜单
dispatchTouchEvent检测旋转的角度,调用requestLayout()不停地重绘界面
public class CircleMenuLayout 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; /** * 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; /** * 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; /** * 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; 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) { 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); // 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); // 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 * * @author zhy * */ 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; // 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 = 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() { @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); } } /** * 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; @Override public boolean dispatchTouchEvent(MotionEvent event) { float x = event.getX(); float y = event.getY(); // Log.e("TAG", "x = " + x + " , y = " + y); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: mLastX = x; mLastY = y; mDownTime = System.currentTimeMillis(); mTmpAngle = 0; // 如果当前已经在快速滚动 if (isFling) { // 移除快速滚动的回调 removeCallbacks(mFlingRunnable); isFling = false; return true; } break; case MotionEvent.ACTION_MOVE: /** * 获得开始的角度 */ float start = getAngle(mLastX, mLastY); /** * 获得当前的角度 */ float end = getAngle(x, y); // Log.e("TAG", "start = " + start + " , end =" + end); // 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; mTmpAngle += end - start; } else // 二、三象限,色角度值是付值 { mStartAngle += start - end; mTmpAngle += start - end; } // 重新布局 requestLayout(); mLastX = x; mLastY = y; break; case MotionEvent.ACTION_UP: // 计算,每秒移动的角度 float anglePerSecond = mTmpAngle * 1000 / (System.currentTimeMillis() - mDownTime); // Log.e("TAG", anglePrMillionSecond + " , mTmpAngel = " + // mTmpAngle); // 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); } /** * 主要为了action_down时,返回true */ @Override public boolean onTouchEvent(MotionEvent event) { return true; } /** * 根据触摸的位置,计算角度 * * @param xTouch * @param yTouch * @return */ 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 * * @param x * @param y * @return */ 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(); } /** * 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 */ 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); } } /** * 如果每秒旋转角度到达该值,则认为是自动滚动 * * @param mFlingableValue */ public void setFlingableValue(int mFlingableValue) { this.mFlingableValue = mFlingableValue; } /** * 设置内边距的比例 * * @param mPadding */ public void setPadding(float mPadding) { this.mPadding = mPadding; } /** * 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); } /** * 自动滚动的任务 * * @author zhy * */ 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(); } } }