一、实现的效果图:
二、实现思路
通过效果图,我们可以考虑到以下几个问题:
1、如何确定各个按钮的位置
通过重写ViewGroup的onLayout方法实现每一个子View的位置的确定。
2、五个子Menu是怎么显示出来的
因为在android中,button的位置如果发生移动,它是不能提供给用户点击的。因此,这五个按钮原本就存在于该位置,只是在刚开始的时候,我们设置它隐藏起来,当点击了一次主Menu,则通过一系列的动画效果,实现其从无到有的弹出过程。
三、实现步骤:
3.1、自定义属性,用于设置ArcMenu的位置:左上、右上、左下、右下;用来设置子Button和主Button的半径
<?xml version="1.0" encoding="utf-8"?>
<resources>
<attr name="position">
<enum name="left_top" value="0" />
<enum name="left_bottom" value="1" />
<enum name="right_top" value="2" />
<enum name="right_bottom" value="3" />
</attr>
<attr name="radius" format="dimension" />
<declare-styleable name="ArcMenu">
<attr name="position" />
<attr name="radius" />
</declare-styleable>
</resources>
3.2、布局文件设置
<com.meinkonone.custom.ArcMenu
android:id="@+id/id_menu"
android:layout_width="match_parent"
android:layout_height="match_parent"
mein:position="right_bottom"
mein:radius="140dp" >
<Button
android:id="@+id/id_button"
android:layout_width="48dp"
android:layout_height="48dp"
android:background="@drawable/oval_btn_bg"
android:text="+" />
<Button
android:layout_width="36dp"
android:layout_height="36dp"
android:background="@drawable/oval_btn_bg"
android:tag="button1"
android:text="1" />
<Button
android:layout_width="36dp"
android:layout_height="36dp"
android:background="@drawable/oval_btn_bg"
android:tag="button2"
android:text="2" />
<Button
android:layout_width="36dp"
android:layout_height="36dp"
android:background="@drawable/oval_btn_bg"
android:tag="button3"
android:text="3" />
<Button
android:layout_width="36dp"
android:layout_height="36dp"
android:background="@drawable/oval_btn_bg"
android:tag="button4"
android:text="4" />
<Button
android:layout_width="36dp"
android:layout_height="36dp"
android:background="@drawable/oval_btn_bg"
android:tag="button5"
android:text="5" />
</com.meinkonone.custom.ArcMenu>
3.3、重写ViewGroup,在拥有三个参数的构造方法中,获取自定义的属性值
public ArcMenu(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mRadius = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
100, getResources().getDisplayMetrics());
// 获取自定义的属性值
TypedArray array = context.getTheme().obtainStyledAttributes(attrs,
R.styleable.ArcMenu, defStyle, 0);
int pos = array.getInt(R.styleable.ArcMenu_position, 3);
switch (pos) {
case POS_LEFT_TOP:
mPosition = Position.LEFT_TOP;
break;
case POS_LEFT_BOTTOM:
mPosition = Position.LEFT_BOTTOM;
break;
case POS_RIGHT_TOP:
mPosition = Position.RIGHT_TOP;
break;
case POS_RIGHT_BOTTOM:
mPosition = Position.RIGHT_BOTTOM;
break;
}
mRadius = (int) array.getDimension(R.styleable.ArcMenu_radius,
TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 100,
getResources().getDisplayMetrics()));
Log.d("xys", "positon = " + mPosition + " , radius = " + mRadius);
// 回收资源
array.recycle();
}
3.4、重写onMeasure()方法 直接通过调用measureChild()方法进行确定大小
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int count = getChildCount();
for (int i = 0; i < count; i++) {
// 测量child
measureChild(getChildAt(i), widthMeasureSpec, heightMeasureSpec);
}
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
3.5、重写onLayout()方法,通过调用childView.layout()方法确定位置
layoutCButton();//设置主Button的位置
layoutChildButton();//设置ItemButton的位置
3.6、设置动画
mCButton的360°旋转
childButton的旋转+平移
childButton的点击动画(变大+透明变化)
3.7、设置接口回调,监听childButton的点击事件
四、具体代码实现
public class ArcMenu extends ViewGroup implements OnClickListener {
private static final int POS_LEFT_TOP = 0;
private static final int POS_LEFT_BOTTOM = 1;
private static final int POS_RIGHT_TOP = 2;
private static final int POS_RIGHT_BOTTOM = 3;
private Position mPosition = Position.RIGHT_BOTTOM;
private int mRadius;
private Status mStatus = Status.CLOSE;
private OnMenuItemClickListener menuItemClickListener;
/**
* 菜单的主按钮
*/
private View mCButton;
/**
* 菜单的状态枚举类
*/
public enum Status {
OPEN, CLOSE
}
/**
* 菜单的位置枚举类
*/
public enum Position {
LEFT_TOP, LEFT_BOTTOM, RIGHT_TOP, RIGHT_BOTTOM
}
/**
* 自定义Menu的对外接口,用于监听按钮的点击事件
*/
public interface OnMenuItemClickListener {
void onClick(View view, int pos);
}
public void setOnMenuItemClickListener(
OnMenuItemClickListener onMenuItemClickListener) {
menuItemClickListener = onMenuItemClickListener;
}
// 避免用户进行直接的构造对象
public ArcMenu(Context context) {
this(context, null);
}
public ArcMenu(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public ArcMenu(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mRadius = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
100, getResources().getDisplayMetrics());
// 获取自定义的属性值
TypedArray array = context.getTheme().obtainStyledAttributes(attrs,
R.styleable.ArcMenu, defStyle, 0);
int pos = array.getInt(R.styleable.ArcMenu_position, 3);
switch (pos) {
case POS_LEFT_TOP:
mPosition = Position.LEFT_TOP;
break;
case POS_LEFT_BOTTOM:
mPosition = Position.LEFT_BOTTOM;
break;
case POS_RIGHT_TOP:
mPosition = Position.RIGHT_TOP;
break;
case POS_RIGHT_BOTTOM:
mPosition = Position.RIGHT_BOTTOM;
break;
}
mRadius = (int) array.getDimension(R.styleable.ArcMenu_radius,
TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 100,
getResources().getDisplayMetrics()));
Log.d("xys", "positon = " + mPosition + " , radius = " + mRadius);
// 回收资源
array.recycle();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int count = getChildCount();
for (int i = 0; i < count; i++) {
// 测量child
measureChild(getChildAt(i), widthMeasureSpec, heightMeasureSpec);
}
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
@Override
protected void onLayout(boolean changed, int arg1, int arg2, int arg3,
int arg4) {
if (changed) {
layoutCButton();
// 定位menuItem
int count = getChildCount();
for (int i = 0; i < count - 1; i++) {
View childView = getChildAt(i + 1);
childView.setVisibility(GONE);
int cl = 0;
int ct = 0;
int cWidth = childView.getMeasuredWidth();
int cHeight = childView.getMeasuredHeight();
// mPosition是左上角时的坐标
cl = (int) (mRadius * Math.sin(Math.PI / 2 / (count - 2) * i));
ct = (int) (mRadius * Math.cos(Math.PI / 2 / (count - 2) * i));
// 如果位于是左下角或者右下角时
if (mPosition == Position.LEFT_BOTTOM
|| mPosition == Position.RIGHT_BOTTOM) {
ct = getMeasuredHeight() - ct - cHeight;
}
// 如果位于右上角或者是右下角时
if (mPosition == Position.RIGHT_BOTTOM
|| mPosition == Position.RIGHT_TOP) {
cl = getMeasuredWidth() - cl - cWidth;
}
Log.d("xys", cl + ", " + ct + ", " + cl + cWidth + ", " + ct
+ cHeight);
// 绘画childView
childView.layout(cl, ct, cl + cWidth, ct + cHeight);
}
}
}
/**
* 定位主菜单按钮
*/
private void layoutCButton() {
mCButton = getChildAt(0);
mCButton.setOnClickListener(this);
int l = 0;
int t = 0;
int width = mCButton.getMeasuredWidth();
int height = mCButton.getMeasuredHeight();
switch (mPosition) {
case LEFT_TOP:
l = 0;
t = 0;
break;
case LEFT_BOTTOM:
l = 0;
t = getMeasuredHeight() - height;
break;
case RIGHT_TOP:
l = getMeasuredWidth() - width;
t = 0;
break;
case RIGHT_BOTTOM:
l = getMeasuredWidth() - width;
t = getMeasuredHeight() - height;
break;
}
mCButton.layout(l, t, l + width, t + width);
}
@Override
public void onClick(View view) {
rotateCButton(view, 0f, 360f, 300);
toggleMenu(300);
}
/**
* 切换菜单
*/
public void toggleMenu(int duration) {
// 为所有的menuItem添加旋转+平移动画
int count = getChildCount();
for (int i = 0; i < count - 1; i++) {
final View chileView = getChildAt(i + 1);
chileView.setVisibility(VISIBLE);
// end 0,0
// start位置
// mPosition是左上角时的坐标
int cl = (int) (mRadius * Math.sin(Math.PI / 2 / (count - 2) * i));
int ct = (int) (mRadius * Math.cos(Math.PI / 2 / (count - 2) * i));
// 标志平移过程的x,y是变大还是缩小
int xflag = 1;
int yflag = 1;
// 位于左上角或者左下角时 平移过程中,x变小
if (mPosition == Position.LEFT_TOP
|| mPosition == Position.LEFT_BOTTOM) {
xflag = -1;
}
// 位于左上角或者右上角时 平移过程中 y变小
if (mPosition == Position.LEFT_TOP
|| mPosition == Position.RIGHT_TOP) {
yflag = -1;
}
AnimationSet animSet = new AnimationSet(true);
Animation tranAnim = null;
// to open
if (mStatus == Status.CLOSE) {
tranAnim = new TranslateAnimation(xflag * cl, 0, yflag * ct, 0);
chileView.setClickable(true);
chileView.setFocusable(true);
} else {// to close
tranAnim = new TranslateAnimation(0, xflag * cl, 0, yflag * ct);
chileView.setClickable(false);
chileView.setFocusable(false);
}
tranAnim.setFillAfter(true);
tranAnim.setDuration(duration);
tranAnim.setAnimationListener(new AnimationListener() {
@Override
public void onAnimationStart(Animation arg0) {
}
@Override
public void onAnimationRepeat(Animation arg0) {
}
@Override
public void onAnimationEnd(Animation arg0) {
if (mStatus == Status.CLOSE) {
chileView.setVisibility(GONE);
}
}
});
RotateAnimation rotateAnim = new RotateAnimation(0, 720,
Animation.RELATIVE_TO_SELF, 0.5f,
Animation.RELATIVE_TO_SELF, 0.5f);
rotateAnim.setDuration(duration);
rotateAnim.setFillAfter(true);
animSet.addAnimation(rotateAnim);
animSet.addAnimation(tranAnim);
animSet.setStartOffset((i * 100) / count);
chileView.startAnimation(animSet);
final int pos = i + 1;
// 设置childView的点击事件
chileView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
if (menuItemClickListener != null) {// 事件的处理
menuItemClickListener.onClick(chileView, pos);
}
menuItemAnim(pos - 1);// 动画的设置
changeStatus();
}
});
}
changeStatus();
}
/**
* 判断menuItem的状态
*
* @return
*/
public boolean isOpen() {
if (mStatus == Status.OPEN) {
return true;
} else {
return false;
}
}
/***
* 设置menuItem的点击动画
*
* @param i
*/
private void menuItemAnim(int pos) {
for (int i = 0; i < getChildCount() - 1; i++) {
View childView = getChildAt(i + 1);
if (i == pos) {
childView.startAnimation(scaleBigAnim(300));
} else {
childView.startAnimation(scaleSmallAnim(300));
}
// 再次隐藏childView
childView.setFocusable(false);
childView.setClickable(false);
}
}
/**
* 为当前点击的item设置变大以及降低透明度的动画
*
* @param duration
* @return
*/
private Animation scaleBigAnim(int duration) {
AnimationSet animSet = new AnimationSet(true);
ScaleAnimation scaleAnim = new ScaleAnimation(1.0f, 2.0f, 1.0f, 2.0f,
Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,
0.5f);
AlphaAnimation alphaAnim = new AlphaAnimation(1f, 0.0f);
animSet.addAnimation(scaleAnim);
animSet.addAnimation(alphaAnim);
animSet.setDuration(duration);
animSet.setFillAfter(true);
return animSet;
}
/**
* 为当前点击的item的其他按钮设置变小大以及降低透明度的动画
*
* @param duration
* @return
*/
private Animation scaleSmallAnim(int duration) {
AnimationSet animSet = new AnimationSet(true);
ScaleAnimation scaleAnim = new ScaleAnimation(1.0f, 0.0f, 1.0f, 0.0f,
Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,
0.5f);
AlphaAnimation alphaAnim = new AlphaAnimation(1f, 0.0f);
animSet.addAnimation(scaleAnim);
animSet.addAnimation(alphaAnim);
animSet.setDuration(duration);
animSet.setFillAfter(true);
return animSet;
}
/**
* 改变menuItem的状态
*/
private void changeStatus() {
mStatus = (mStatus == Status.CLOSE ? Status.OPEN : Status.CLOSE);
}
/**
* 绕自身旋转
*
* @param view
* @param start
* @param end
* @param duration
*/
private void rotateCButton(View view, float start, float end, int duration) {
RotateAnimation anim = new RotateAnimation(start, end,
Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,
0.5f);
anim.setDuration(duration);
anim.setFillAfter(true);
view.startAnimation(anim);// 启动anim
}
}