Android 自定义ViewGroup实现弧形菜单
1、直接继承ViewGroup类，onMeasure测量子控件，onLayout第一个子控件放在边角，其他的子控件根据弧度计算其位置来进行layout。
2、动画效果：第一个按钮的旋转动画 RotateAnimation，其他的控件TranslateAnimation和RotateAnimation两个动画，点击ScaleAnimation动画和AlphaAnimation动画 ，设置好延迟的时间间隔就可以看到效果了。
import android.content.Context; import android.content.res.TypedArray; import android.util.AttributeSet; import android.util.Log; import android.util.TypedValue; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.view.animation.Animation; import android.view.animation.Animation.AnimationListener; import android.view.animation.AlphaAnimation; import android.view.animation.AnimationSet; import android.view.animation.OvershootInterpolator; import android.view.animation.RotateAnimation; import android.view.animation.ScaleAnimation; import android.view.animation.TranslateAnimation; /** * @author zhy */ public class ArcMenu extends ViewGroup implements OnClickListener { private static final String TAG = "ArcMenu"; /** * 菜单的显示位置 */ private Position mPosition = Position.LEFT_TOP; /** * 菜单显示的半径，默认100dp */ private int mRadius = 100; /** * 用户点击的按钮 */ private View mButton; /** * 当前ArcMenu的状态 */ private Status mCurrentStatus = Status.CLOSE; /** * 回调接口 */ private OnMenuItemClickListener onMenuItemClickListener; /** * 状态的枚举类 * * @author zhy * */ public enum Status { OPEN, CLOSE } /** * 设置菜单现实的位置，四选1，默认右下 * * @author zhy */ public enum Position { LEFT_TOP, RIGHT_TOP, RIGHT_BOTTOM, LEFT_BOTTOM; } public interface OnMenuItemClickListener { void onClick(View view, int pos); } public ArcMenu(Context context) { this(context, null); } public ArcMenu(Context context, AttributeSet attrs) { this(context, attrs, 0); } /** * 初始化属性 * * @param context * @param attrs * @param defStyle */ public ArcMenu(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); // dp convert to px mRadius = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, mRadius, getResources().getDisplayMetrics()); TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.ArcMenu, defStyle, 0); int n = a.getIndexCount(); for (int i = 0; i < n; i++) { int attr = a.getIndex(i); switch (attr) { case R.styleable.ArcMenu_position: int val = a.getInt(attr, 0); switch (val) { case 0: mPosition = Position.LEFT_TOP; break; case 1: mPosition = Position.RIGHT_TOP; break; case 2: mPosition = Position.RIGHT_BOTTOM; break; case 3: mPosition = Position.LEFT_BOTTOM; break; } break; case R.styleable.ArcMenu_radius: // dp convert to px mRadius = a.getDimensionPixelSize(attr, (int) TypedValue .applyDimension(TypedValue.COMPLEX_UNIT_DIP, 100f, getResources().getDisplayMetrics())); break; } } a.recycle(); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int count = getChildCount(); for (int i = 0; i < count; i++) { // mesure child getChildAt(i).measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED); } super.onMeasure(widthMeasureSpec, heightMeasureSpec); } @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { if (changed) { layoutButton(); int count = getChildCount(); /** * 设置所有孩子的位置 例如(第一个为按钮)： 左上时，从左到右 ] 第2个：mRadius(sin0 , cos0) * 第3个：mRadius(sina ,cosa) 注：[a = Math.PI / 2 * (cCount - 1)] * 第4个：mRadius(sin2a ,cos2a) 第5个：mRadius(sin3a , cos3a) ... */ for (int i = 0; i < count - 1; i++) { View child = getChildAt(i + 1); child.setVisibility(View.GONE); int cl = (int) (mRadius * Math.sin(Math.PI / 2 / (count - 2) * i)); int ct = (int) (mRadius * Math.cos(Math.PI / 2 / (count - 2) * i)); // childview width int cWidth = child.getMeasuredWidth(); // childview height int cHeight = child.getMeasuredHeight(); // 右上，右下 if (mPosition == Position.LEFT_BOTTOM || mPosition == Position.RIGHT_BOTTOM) { ct = getMeasuredHeight() - cHeight - ct; } // 右上，右下 if (mPosition == Position.RIGHT_TOP || mPosition == Position.RIGHT_BOTTOM) { cl = getMeasuredWidth() - cWidth - cl; } Log.e(TAG, cl + " , " + ct); child.layout(cl, ct, cl + cWidth, ct + cHeight); } } } /** * 第一个子元素为按钮，为按钮布局且初始化点击事件 */ private void layoutButton() { View cButton = getChildAt(0); cButton.setOnClickListener(this); int l = 0; int t = 0; int width = cButton.getMeasuredWidth(); int height = cButton.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; } Log.e(TAG, l + " , " + t + " , " + (l + width) + " , " + (t + height)); cButton.layout(l, t, l + width, t + height); } /** * 为按钮添加点击事件 */ @Override public void onClick(View v) { mButton = findViewById(R.id.id_button); if (mButton == null) { mButton = getChildAt(0); } rotateView(mButton, 0f, 270f, 300); toggleMenu(300); } /** * 按钮的旋转动画 * * @param view * @param fromDegrees * @param toDegrees * @param durationMillis */ public static void rotateView(View view, float fromDegrees, float toDegrees, int durationMillis) { RotateAnimation rotate = new RotateAnimation(fromDegrees, toDegrees, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); rotate.setDuration(durationMillis); rotate.setFillAfter(true); view.startAnimation(rotate); } public void toggleMenu(int durationMillis) { int count = getChildCount(); for (int i = 0; i < count - 1; i++) { final View childView = getChildAt(i + 1); childView.setVisibility(View.VISIBLE); int xflag = 1; int yflag = 1; if (mPosition == Position.LEFT_TOP || mPosition == Position.LEFT_BOTTOM) xflag = -1; if (mPosition == Position.LEFT_TOP || mPosition == Position.RIGHT_TOP) yflag = -1; // child left int cl = (int) (mRadius * Math.sin(Math.PI / 2 / (count - 2) * i)); // child top int ct = (int) (mRadius * Math.cos(Math.PI / 2 / (count - 2) * i)); AnimationSet animset = new AnimationSet(true); Animation animation = null; if (mCurrentStatus == Status.CLOSE) {// to open animset.setInterpolator(new OvershootInterpolator(2F)); animation = new TranslateAnimation(xflag * cl, 0, yflag * ct, 0); childView.setClickable(true); childView.setFocusable(true); } else {// to close animation = new TranslateAnimation(0f, xflag * cl, 0f, yflag * ct); childView.setClickable(false); childView.setFocusable(false); } animation.setAnimationListener(new AnimationListener() { public void onAnimationStart(Animation animation) { } public void onAnimationRepeat(Animation animation) { } public void onAnimationEnd(Animation animation) { if (mCurrentStatus == Status.CLOSE) childView.setVisibility(View.GONE); } }); animation.setFillAfter(true); animation.setDuration(durationMillis); // 为动画设置一个开始延迟时间，纯属好看，可以不设 animation.setStartOffset((i * 100) / (count - 1)); RotateAnimation rotate = new RotateAnimation(0, 720, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); rotate.setDuration(durationMillis); rotate.setFillAfter(true); animset.addAnimation(rotate); animset.addAnimation(animation); childView.startAnimation(animset); final int index = i + 1; childView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (onMenuItemClickListener != null) onMenuItemClickListener.onClick(childView, index - 1); menuItemAnin(index - 1); changeStatus(); } }); } changeStatus(); Log.e(TAG, mCurrentStatus.name() +""); } private void changeStatus() { mCurrentStatus = (mCurrentStatus == Status.CLOSE ? Status.OPEN : Status.CLOSE); } /** * 开始菜单动画，点击的MenuItem放大消失，其他的缩小消失 * @param item */ private void menuItemAnin(int item) { for (int i = 0; i < getChildCount() - 1; i++) { View childView = getChildAt(i + 1); if (i == item) { childView.startAnimation(scaleBigAnim(300)); } else { childView.startAnimation(scaleSmallAnim(300)); } childView.setClickable(false); childView.setFocusable(false); } } /** * 缩小消失 * @param durationMillis * @return */ private Animation scaleSmallAnim(int durationMillis) { Animation anim = new ScaleAnimation(1.0f, 0f, 1.0f, 0f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); anim.setDuration(durationMillis); anim.setFillAfter(true); return anim; } /** * 放大，透明度降低 * @param durationMillis * @return */ private Animation scaleBigAnim(int durationMillis) { AnimationSet animationset = new AnimationSet(true); Animation anim = new ScaleAnimation(1.0f, 4.0f, 1.0f, 4.0f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); Animation alphaAnimation = new AlphaAnimation(1, 0); animationset.addAnimation(anim); animationset.addAnimation(alphaAnimation); animationset.setDuration(durationMillis); animationset.setFillAfter(true); return animationset; } public Position getmPosition() { return mPosition; } public void setmPosition(Position mPosition) { this.mPosition = mPosition; } public int getmRadius() { return mRadius; } public void setmRadius(int mRadius) { this.mRadius = mRadius; } public Status getmCurrentStatus() { return mCurrentStatus; } public void setmCurrentStatus(Status mCurrentStatus) { this.mCurrentStatus = mCurrentStatus; } public OnMenuItemClickListener getOnMenuItemClickListener() { return onMenuItemClickListener; } public void setOnMenuItemClickListener( OnMenuItemClickListener onMenuItemClickListener) { this.onMenuItemClickListener = onMenuItemClickListener; } }
