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
代码语言：javascript复制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
代码语言：javascript复制/**
* 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。
