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
扇形菜单效果展示图.gif
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
/**
* Created by FrankChoo on 2017/10/18.
* Email: frankchoochina@gmail.com
* Version: 2.0
* Description: 底部扇形菜单
* 使用方式: new BottomSectorMenuView.Converter(mFab).apply()
*/
public class BottomSectorMenuView extends ViewGroup {
private final static int STATUS_MENU_OPENED = 0x000000001;
private final static int STATUS_MENU_CLOSED = 0x000000002;
private int mCurrentStatus = STATUS_MENU_CLOSED;
// Duplicate 的锚定 View
private ImageView mAnchorView;
// 画笔
private Paint mPaint;
// 坐标
private Point mCenter;
private Point mAnchorStart;
// 每个ItemView之间的角度差
private double mAngle;
// 半径
private float mMenuItemRadius; // ItemView 到圆心的半径
private float mBackgroundRadius;// 背景圆的半径
// 动画执行比率
private float mBackgroundSpreadPercent;// 当前背景动画执行百分比
private float mMenuItemSpreadPercent;// 当前Item动画执行的百分比
// 动画
private AnimatorSet mMenuCloseAnimator;
private AnimatorSet mMenuOpenAnimator;
// 动画时长
private long mMenuCloseDuration;
private long mMenuOpenDuration;
// 按钮旋转角度
private float mAnchorRotationAngle;
// 监听器
private OnMenuClosedListener mListener;
private BottomSectorMenuView(Context context) {
this(context, null);
}
private BottomSectorMenuView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
private BottomSectorMenuView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
// 初始化画笔
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.DITHER_FLAG);
mPaint.setColor(Color.WHITE);
// 初始化参数
int width = getResources().getDisplayMetrics().widthPixels;
int height = getResources().getDisplayMetrics().heightPixels;
// 获取圆心坐标
mCenter = new Point(width / 2, height);
// 获取半径
mMenuItemRadius = width / 2;
mBackgroundRadius = (int) Math.sqrt(Math.pow(width / 2, 2.0) + Math.pow(width / 2, 2.0));
setWillNotDraw(false);
}
/********************************* 以下是向外界暴露的方法*************************************/
// 打开菜单
public void openMenu() {
if (mCurrentStatus == STATUS_MENU_OPENED) return;
if (mMenuOpenAnimator != null && mMenuOpenAnimator.isRunning()) return;
showMenuOpenAnimator();
}
// 关闭菜单
public void closeMenu(OnMenuClosedListener listener) {
if (mCurrentStatus == STATUS_MENU_CLOSED) return;
if (mMenuCloseAnimator != null && mMenuCloseAnimator.isRunning()) return;
showMenuCloseAnimator(listener);
}
// 菜案是否开启
public boolean isOpen() {
return mCurrentStatus == STATUS_MENU_OPENED;
}
public interface OnMenuClosedListener {
void onMenuClosed();
}
/********************************* 以上是向外界暴露的方法*************************************/
private void initData(View anchorView, OnMenuClosedListener listener) {
mListener = listener;
// 获取锚定View在屏幕内的坐标
int[] rawPosition = new int[2];
anchorView.getLocationOnScreen(rawPosition);
int left = rawPosition[0];
int top = rawPosition[1];
mAnchorStart = new Point(left, top);
// 制造一个与原先一样的View放在原来的位置
mAnchorView = new ImageView(getContext());
mAnchorView.setLayoutParams(new LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
mAnchorView.setImageBitmap(getBitmapFromView(anchorView));
// 设置点击返回的效果
mAnchorView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
closeMenu(null);
}
});
addView(mAnchorView, 0);
}
private void addMenuItems(List<View> views) {
for (View view : views) {
addView(view);
}
mAngle = Math.PI / (views.size() + 1);
}
private void setToggleDuration(long open, long close) {
mMenuOpenDuration = open;
mMenuCloseDuration = close;
}
private void setAnchorRotationAngle(float angle) {
mAnchorRotationAngle = angle;
}
private void showMenuOpenAnimator() {
// 锚点动画
ObjectAnimator anchorAnim = ObjectAnimator.ofFloat(mAnchorView, "rotation", 0f, mAnchorRotationAngle);
anchorAnim.setInterpolator(new OvershootInterpolator(3f));
// 背景动画
ValueAnimator brgSpreadAnim = ValueAnimator.ofFloat(0f, 1f);
brgSpreadAnim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
mBackgroundSpreadPercent = (float) animation.getAnimatedValue();
invalidate();
}
});
// item的位置动画
ValueAnimator itemSpreadAnim = ValueAnimator.ofFloat(0f, 1f);
itemSpreadAnim.setInterpolator(new OvershootInterpolator(2f));
itemSpreadAnim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
mMenuItemSpreadPercent = (float) animation.getAnimatedValue();
requestLayout();
}
});
// 动画集合
mMenuOpenAnimator = new AnimatorSet();
mMenuOpenAnimator.setDuration(mMenuOpenDuration == 0 ? 800 : mMenuOpenDuration);
mMenuOpenAnimator.play(brgSpreadAnim).before(itemSpreadAnim);
mMenuOpenAnimator.play(anchorAnim).with(brgSpreadAnim);
mMenuOpenAnimator.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationStart(Animator animation) {
setAlpha(1f);
}
@Override
public void onAnimationEnd(Animator animation) {
mCurrentStatus = STATUS_MENU_OPENED;
}
});
mMenuOpenAnimator.start();
}
private void showMenuCloseAnimator(final OnMenuClosedListener listener) {
// Item动画
ValueAnimator itemViewAnim = ValueAnimator.ofFloat(1f, 0f)
.setDuration(mMenuCloseDuration == 0 ? 300 : mMenuCloseDuration / 2);
itemViewAnim.setInterpolator(new AnticipateInterpolator(2f));
itemViewAnim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
mMenuItemSpreadPercent = (float) animation.getAnimatedValue();
requestLayout();
}
});
// 背景动画
ValueAnimator backgroundAnim = ValueAnimator.ofFloat(1f, 0f)
.setDuration(mMenuCloseDuration == 0 ? 300 : mMenuCloseDuration / 2);
backgroundAnim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
mBackgroundSpreadPercent = (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(mMenuCloseDuration == 0 ? 300 : mMenuCloseDuration / 2);
// 锚点动画
ObjectAnimator anchorAnim = ObjectAnimator.ofFloat(mAnchorView, "rotation", mAnchorRotationAngle, 0f)
.setDuration(mMenuCloseDuration == 0 ? 300 : mMenuCloseDuration / 2);
anchorAnim.setInterpolator(new OvershootInterpolator(3f));
// 动画集合
mMenuCloseAnimator = new AnimatorSet();
mMenuCloseAnimator.play(itemViewAnim).before(backgroundAnim);
mMenuCloseAnimator.play(alphaAnim).with(backgroundAnim);
mMenuCloseAnimator.play(anchorAnim).with(backgroundAnim);
mMenuCloseAnimator.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
mCurrentStatus = STATUS_MENU_CLOSED;
// Convert回调
mListener.onMenuClosed();
// 用户回调
if (listener != null) {
listener.onMenuClosed();
}
}
});
mMenuCloseAnimator.start();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
for (int i = 0; i < getChildCount(); i++) {
View child = getChildAt(i);
measureChild(child, widthMeasureSpec, heightMeasureSpec);
}
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
for (int i = 0; i < getChildCount(); i++) {
View child = getChildAt(i);
if (i == 0) {
child.layout(
mAnchorStart.x,
mAnchorStart.y,
mAnchorStart.x + child.getMeasuredWidth(),
mAnchorStart.y + child.getMeasuredHeight()
);
continue;
}
// 动态的计算角度
double curAngle = Math.PI - mAngle * i;
int childCenterX = (int) (mCenter.x + mMenuItemRadius * mMenuItemSpreadPercent * Math.cos(curAngle));
int childCenterY = (int) (mCenter.y - mMenuItemRadius * mMenuItemSpreadPercent * Math.sin(curAngle));
child.layout(
childCenterX - child.getMeasuredWidth() / 2,
childCenterY - child.getMeasuredHeight() / 2,
childCenterX + child.getMeasuredWidth() / 2,
childCenterY + child.getMeasuredHeight() / 2
);
// 动态的去设置ItemView的透明度
child.setAlpha(mMenuItemSpreadPercent);
}
}
@Override
protected void onDraw(Canvas canvas) {
if (mAnchorView == null)
return;
if (mBackgroundSpreadPercent > 0) {
canvas.drawCircle(mCenter.x, mCenter.y, mBackgroundRadius * mBackgroundSpreadPercent, mPaint);
}
super.onDraw(canvas);
}
private Bitmap getBitmapFromView(View view) {
// 创建缓存
view.buildDrawingCache();
// 获取缓存
return view.getDrawingCache();
}
/**
* 外界用于构建菜单的类
*/
public static class Converter implements OnMenuClosedListener {
private Context mContext;
private View mAnchorView;
private WindowManager mWindowManager;
private ContainerView mWindowContainer;
private BottomSectorMenuView mBottomMenuView;
private WindowManager.LayoutParams mParams;
private List<View> mViews = new ArrayList<>();
private long mMenuOpenDuration;
private long mMenuCloseDuration;
private float mAnchorRotationAngle;
public Converter(View view) {
mAnchorView = view;
mContext = mAnchorView.getContext();
if (!(mContext instanceof Activity)) {
throw new IllegalArgumentException("请确保当前的View依附的是Activity");
}
}
public Converter setToggleDuration(long open, long close) {
mMenuOpenDuration = open;
mMenuCloseDuration = close;
return this;
}
public Converter setAnchorRotationAngle(float angle) {
mAnchorRotationAngle = angle;
return this;
}
public Converter addMenuItem(@DrawableRes int iconRes, CharSequence text, final View.OnClickListener listener) {
// 初始化Item的容器
LinearLayout itemContainer = new LinearLayout(mContext);
itemContainer.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT
, LayoutParams.WRAP_CONTENT));
itemContainer.setOrientation(LinearLayout.VERTICAL);
itemContainer.setGravity(Gravity.CENTER);
// 初始化图片
ImageView imageView = new ImageView(mContext);
int maxRadius = mContext.getResources().getDisplayMetrics().widthPixels / 2;
imageView.setLayoutParams(new LinearLayout.LayoutParams(maxRadius / 5, maxRadius / 5));
imageView.setImageResource(iconRes);
imageView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(final View view) {
mBottomMenuView.closeMenu(new OnMenuClosedListener() {
@Override
@SuppressLint("NewApi")
public void onMenuClosed() {
listener.onClick(view);
if (mWindowContainer.isAttachedToWindow()) {
mWindowManager.removeView(mWindowContainer);
}
}
});
}
});
itemContainer.addView(imageView);
// 初始化文本
if (text != null && !((String) text).trim().isEmpty()) {
TextView textView = new TextView(mContext);
textView.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT));
textView.setText(text);
textView.setTextColor(Color.BLACK);
textView.setPadding(0, dp2px(5), 0, 0);
itemContainer.addView(textView);
}
mViews.add(itemContainer);
return this;
}
public BottomSectorMenuView apply() {
init();
// 开启时, 将我们的Container加载到Window中
mAnchorView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// 先添加进Window
mWindowManager.addView(mWindowContainer, mParams);
// 再开启菜单
mBottomMenuView.openMenu();
}
});
// 给mContainer绑定返回监听器
mWindowContainer.setOnBackPressedListener(new ContainerView.OnBackPressedListener() {
@Override
public void onBackPress() {
if (mBottomMenuView.isOpen()) {
mBottomMenuView.closeMenu(null);
}
}
});
mAnchorView.post(new Runnable() {
@Override
public void run() {
mBottomMenuView.setToggleDuration(mMenuOpenDuration, mMenuCloseDuration);
mBottomMenuView.setAnchorRotationAngle(mAnchorRotationAngle);
mBottomMenuView.initData(mAnchorView, Converter.this);
mBottomMenuView.addMenuItems(mViews);
}
});
return mBottomMenuView;
}
private void init() {
mWindowManager = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);
mParams = new WindowManager.LayoutParams();
mParams.width = mContext.getResources().getDisplayMetrics().widthPixels;
mParams.height = mContext.getResources().getDisplayMetrics().heightPixels;
mParams.flags = WindowManager.LayoutParams.FLAG_LOCAL_FOCUS_MODE
| WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS;
mParams.format = PixelFormat.TRANSPARENT;
mWindowContainer = new ContainerView(mContext);
mBottomMenuView = new BottomSectorMenuView(mContext);
mBottomMenuView.setLayoutParams(new FrameLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
mWindowContainer.addView(mBottomMenuView);
}
@RequiresApi(api = Build.VERSION_CODES.KITKAT)
@Override
public void onMenuClosed() {
if (mWindowContainer.isAttachedToWindow()) {
mWindowManager.removeView(mWindowContainer);
}
}
protected int dp2px(float dp) {
return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp, mContext.getResources().getDisplayMetrics());
}
}
/**
* 用于回调Window下的点击返回事件的ViewGroup
*/
public static class ContainerView extends FrameLayout {
private boolean mIsBackPressed = false;
public ContainerView(Context context) {
super(context);
}
public ContainerView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public ContainerView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
/**
* 点击返回事件的回调接口
*/
public interface OnBackPressedListener {
void onBackPress();
}
OnBackPressedListener mOnBackPressedListener = null;
public void setOnBackPressedListener(OnBackPressedListener listener) {
mOnBackPressedListener = listener;
}
/**
* 重写该方法, 用于监听返回键
*/
@Override
public boolean dispatchKeyEvent(KeyEvent event) {
if (event.getKeyCode() == KeyEvent.KEYCODE_BACK
|| event.getKeyCode() == KeyEvent.KEYCODE_SETTINGS) {
if (mIsBackPressed) return true;// 防止返回按钮被处触发两次
mIsBackPressed = true;
if (mOnBackPressedListener != null) {
// 从我们定义的接口中将其回调出去
mOnBackPressedListener.onBackPress();
postDelayed(new Runnable() {
@Override
public void run() {
mIsBackPressed = false;
}
}, 500);
return true;
}
}
return super.dispatchKeyEvent(event);
}
}
}
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