这次分析一个扇形菜单展开的自定义View, 也是我实习期间做的一个印象比较深刻的自定义View, 前后切换了很多种实现思路, 先看看效果展示

效果展示

效果分析

点击圆形的FloatActionBar, 自身旋转一定的角度

菜单像波纹一样扩散开来

显示我们添加的item

实现分析

使用adapter适配器去设置View, 用户可自定义性强, 不过每次使用需要去设置Adapter, 较为繁琐

直接调用ItemView, 将ImageView和TextView写死, 用户操作简单, 但是缺乏可定制性(利他)

本次功能实现采用了方案 2

实现步骤

与气泡拖拽类似, 新开启一个Window进行自定义View的绘制

初始化时调用setWillNotDraw(false)方法, 强行启动ViewGroup的绘制

onMeasure中将宽高写死

绘制背景

锚点为View的底部中心点

半径为屏幕宽度一半的平方和的开方(注意这里不是屏幕的一半)

添加itemView, 在onLayout中去确定其位置

添加动画效果

将相关接口暴露给外界

使用方式

BottomSectorMenuView.Converter(mFab) .setToggleDuration(500, 800) .setAnchorRotationAngle(135f) .addMenuItem(R.drawable.icon_camera, "拍照") { Toast.makeText(this@MainActivity, "拍照", Toast.LENGTH_SHORT).show() } .addMenuItem(R.drawable.icon_photo, "图片") { Toast.makeText(this@MainActivity, "图片", Toast.LENGTH_SHORT).show() } .addMenuItem(R.drawable.icon_text, "文字") { Toast.makeText(this@MainActivity, "文字", Toast.LENGTH_SHORT).show() } .addMenuItem(R.drawable.icon_video, "视频") { Toast.makeText(this@MainActivity, "视频", Toast.LENGTH_SHORT).show() } .addMenuItem(R.drawable.icon_camera_shooting, "摄像") { Toast.makeText(this@MainActivity, "摄像", Toast.LENGTH_SHORT).show() } .apply()

源码实现

/** * Email: frankchoochina@gmail.com * Created by FrankChoo on 2017/10/9. * Description: 底部扇形菜单, 通过Adapter添加Item * 1. 调用openMenu打开菜单 * 2. 调用closeMenu关闭菜单 */public class SectorMenuView extends FrameLayout { // 每个ItemView之间的角度差 private double mAngle; // 圆心坐标 private Point mCenterPoint; // ItemView到圆心的半径 private float mMaxItemRadius; private float mCurItemRadius; // 背景圆的半径 private float mMaxBkgRadius; private float mCurBkgRadius; private Paint mPaint; private SectorMenuAdapter mAdapter; private OnMenuOpenedListener mMenuOpenedListener; private OnMenuClosedListener mMenuClosedListener; public SectorMenuView(Context context) { this(context, null); } public SectorMenuView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public SectorMenuView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(); } private void init() { // 初始化画笔 mPaint = new Paint(Paint.ANTI_ALIAS_FLAG); mPaint.setDither(true); mPaint.setStyle(Paint.Style.FILL); mPaint.setColor(Color.WHITE); // 设置背景圆绘制的半径 int displayWidth = getResources().getDisplayMetrics().widthPixels; mMaxBkgRadius = (int) Math.sqrt(Math.pow(displayWidth/2, 2.0) + Math.pow(displayWidth/2, 2.0)); // 开启ViewGroup的绘制 setWillNotDraw(false); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); // 这里直接将宽高写死, 不支持Margin int width = getResources().getDisplayMetrics().widthPixels; int height = (int) Math.sqrt(Math.pow(width / 2, 2.0) + Math.pow(width / 2, 2.0)); setMeasuredDimension(width, height); // 计算半径 int realWidth = width - getPaddingRight() - getPaddingLeft(); int realHeight = height - getPaddingTop() - getPaddingBottom(); mMaxItemRadius = realWidth / 2; // 计算圆心 int centerX = getPaddingLeft() + realWidth / 2; int centerY = getPaddingTop() + realHeight; mCenterPoint = new Point(centerX, centerY); } @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { super.onLayout(changed, l, t, r, b); for (int i = 0; i < getChildCount(); i++) { View child = getChildAt(i); double curAngle = Math.PI - mAngle * (i + 1); int childCenterX = (int) (mCenterPoint.x + mCurItemRadius * Math.cos(curAngle)); int childCenterY = (int) (mCenterPoint.y - mCurItemRadius * Math.sin(curAngle)); child.layout( childCenterX - child.getMeasuredWidth() / 2, childCenterY - child.getMeasuredHeight() / 2, childCenterX + child.getMeasuredWidth() / 2, childCenterY + child.getMeasuredHeight() / 2 ); // 这里动态的去设置子View的透明度 child.setAlpha(mCurItemRadius / mMaxItemRadius); } } @Override protected void onDraw(Canvas canvas) { canvas.drawCircle(mCenterPoint.x, mCenterPoint.y, mCurBkgRadius, mPaint); super.onDraw(canvas); } public void setAdapter(SectorMenuAdapter adapter) { mAdapter = adapter; for (int i = 0; i < mAdapter.getCount(); i++) { View child = mAdapter.getView(i, null, this); addView(child); } mAngle = Math.PI / (mAdapter.getCount() + 1); } public void setBackgroudColor(@ColorInt int color) { mPaint.setColor(color); } public void setBackgroundResource(@ColorRes int colorResId) { mPaint.setColor(ContextCompat.getColor(getContext(), colorResId)); } /** * 打开菜单 */ public void openMenu() { if (mMaxItemRadius == 0) { mMaxItemRadius = getResources().getDisplayMetrics().widthPixels / 2 - getPaddingRight() - getPaddingLeft(); } // 背景动画 ValueAnimator bkgAnim = ValueAnimator.ofFloat(0f, mMaxBkgRadius).setDuration(300); bkgAnim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { mCurBkgRadius = (float) animation.getAnimatedValue(); invalidate(); } }); // item的位置动画 ValueAnimator itemTranslationAnim = ValueAnimator.ofFloat(0f, mMaxItemRadius).setDuration(300); itemTranslationAnim.setInterpolator(new OvershootInterpolator(2f)); itemTranslationAnim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { mCurItemRadius = (float) animation.getAnimatedValue(); requestLayout(); } }); // 动画集合 final AnimatorSet set = new AnimatorSet(); set.playSequentially(bkgAnim, itemTranslationAnim); set.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationStart(Animator animation) { setAlpha(1f); setVisibility(View.VISIBLE); } @Override public void onAnimationEnd(Animator animation) { if (mMenuOpenedListener != null) { mMenuOpenedListener.opened(); } } }); set.start(); } /** * 关闭菜单 */ public void closeMenu() { // Item动画 ValueAnimator itemViewAnim = ValueAnimator.ofFloat(mMaxItemRadius, 0f).setDuration(300); itemViewAnim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { mCurItemRadius = (float) animation.getAnimatedValue(); requestLayout(); } }); itemViewAnim.setInterpolator(new AnticipateInterpolator(2f)); // 背景动画 ValueAnimator backgroundAnim = ValueAnimator.ofFloat(mMaxBkgRadius, 0f).setDuration(300); backgroundAnim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { mCurBkgRadius = (float) animation.getAnimatedValue(); invalidate(); } }); // 这里设置了该View整体透明度的变化, 防止消失的背景不在锚点处, 显示效果突兀 ObjectAnimator alphaAnim = ObjectAnimator.ofFloat(this, "alpha", 1f, 0f).setDuration(250); // 动画集合 AnimatorSet animatorSet = new AnimatorSet(); animatorSet.play(itemViewAnim).before(backgroundAnim); animatorSet.play(backgroundAnim).with(alphaAnim); animatorSet.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { if (mMenuClosedListener != null) { mMenuClosedListener.closed(); } setVisibility(View.INVISIBLE); } }); animatorSet.start(); } public void setOnMenuOpenedListener(OnMenuOpenedListener listener) { mMenuOpenedListener = listener; } public void setOnMenuClosedListener(OnMenuClosedListener listener) { mMenuClosedListener = listener; } /** * 供外界调用的Adapter */ public abstract static class SectorMenuAdapter extends BaseAdapter { @Override public long getItemId(int position) { return 0; } @Override public Object getItem(int position) { return null; } @Override public View getView(int position, View convertView, ViewGroup parent) { return createView(position, parent); } protected abstract View createView(int position, ViewGroup parent); @Override public abstract int getCount(); } public interface OnMenuOpenedListener { void opened(); } public interface OnMenuClosedListener { void closed(); }}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。