Android 自己定义ViewGroup手把手教你实现ArcMenu
Posted claireyuancy
tags:
篇首语:本文由小常识网(cha138.com)小编为大家整理,主要介绍了Android 自己定义ViewGroup手把手教你实现ArcMenu相关的知识,希望对你有一定的参考价值。
转载请标明出处:http://blog.csdn.net/lmj623565791/article/details/37567907
逛eoe发现这种UI效果,感觉非常不错,后来知道github上有这么个开源项目~~~~当然本篇不是教你怎样使用这个开源项目,而是教你怎样自己通过自己定义ViewGroup写这种效果,自己定义ViewGroup也是我的痛楚。嘿嘿。希望以此能够抛砖引玉~~
效果图:
1、实现思路
通过效果图,会有几个问题:
a、动画效果怎样实现
能够看出动画是从顶点外外发射的,可能有人说。那还不简单。默认元素都在定点位置。然后TraslateAnimation就好了;这样忽略了一点,就是TraslateAnimation尽管有动画效果,可是本质是不会改变button的位置,我们的button动画结束是要点击的;有人可能会说那使用属性动画,或者改变leftMagin,rightMagin;这样可能比較麻烦,事实上我们能够默认让子菜单就已经在目标位置,然后GONE。当点击时还是用TraslateAnimation,把起始位置设为定点,终点位置就是我们隐藏的区域,动画结束VISIBLE.
b、怎样确定位置呢?
这可能须要一点数学上的知识。我画了一张草图(冰天雪地。跪玻璃碴子求画以下这些图的工具):
每次会依据子菜单数量。算出a这个角度,然后通过sin , cos 分别算出每一个子菜单的left , top ;
当然这是在左上的情况。假设在右上,则top还是和左上一致的。left则为 (屏幕宽度-左上算出的left) ;其它两个方位同理~
总体我通过自己定义一个ViewGroup,这个ViewGroup中第一个子元素为点击的button(你能够随便布局。随便用什么控件),接下来的子元素我觉得是菜单项。依据效果图,决定展开半径和显示的位置,让用户自己去定制。
以下看详细实现:
2、自己定义View的属性:
<?xml version="1.0" encoding="utf-8"?> <resources> <attr name="position"> <enum name="left_top" value="0" /> <enum name="right_top" value="1" /> <enum name="right_bottom" value="2" /> <enum name="left_bottom" value="3" /> </attr> <attr name="radius" format="dimension"></attr> <declare-styleable name="ArcMenu"> <attr name="position" /> <attr name="radius"/> </declare-styleable> </resources>
3、在自己定义的ViewGroup中获取这些属性
Arcmenu.java
/** * @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button */ 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(); }
4、计算子元素的大小:
@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); }
5、确定子元素的位置:
@Override protected void onLayout(boolean changed, int l, int t, int r, int b) { if (changed) { layoutButton(); int count = getChildCount(); /** * 设置全部孩子的位置 比如(第一个为button): 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); } } }
首先在layoutButton中对button位置即可设置,以及初始化点击事件;然后从第二个子元素開始为菜单项,分别设置其位置,计算的原理就是上面我画的草图,能够再去细致看看,动手在纸上画一画。
/** * 第一个子元素为button,为button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); }
这是定位Button的代码。此时的代码已经实现了定位,假设你把onLayout中childView.setVisibility(VISIBLE)。
ArcMenu的整个控件的样子已经实现了,接下来就是点击事件。已经效果动画的实现了。
6、设置button点击事件
/** * 为button加入点击事件 */ @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); }
/** * button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); // 为动画设置一个開始延迟时间,纯属好看,能够不设 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() +""); }
点击时,触发TanslateAnimation动画。从定点向外扩展。也给点击button加入了一个旋转动画。每一个子菜单项相同加入了旋转动画,且假设用户设置回调。调用回调接口。设置子菜单的点击事件。总体就是点击然后动画效果~~
7、设置子菜单的点击事件
/** * 開始菜单动画。点击的MenuItem放大消失。其它的缩小消失 * @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。透明度减少 * @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; }
点击的菜单项变大且慢慢透明消失,未点击的菜单项缩小消失~有兴趣的能够改成自己喜欢的动画~
注:动画效果非常多借鉴了eoe上那位仁兄的代码,这类动画也比較简单。就不多说了~
好了,剩下就是些getter。setter了~
8、布局文件:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" xmlns:zhy="http://schemas.android.com/apk/res/com.example.zhy_arcmenu" android:layout_width="match_parent" android:layout_height="match_parent" > <com.example.zhy_arcmenu.ArcMenu android:id="@+id/id_arcmenu1" android:layout_width="fill_parent" android:layout_height="fill_parent" zhy:position="left_top" zhy:radius="130dp" > <RelativeLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/composer_button" > <ImageView android:id="@+id/id_button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:src="@drawable/composer_icn_plus" /> </RelativeLayout> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:src="@drawable/composer_camera" android:tag="Camera" /> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:src="@drawable/composer_sun" android:tag="Sun" /> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:src="@drawable/composer_place" android:tag="Place" /> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:src="@drawable/composer_sleep" android:tag="Sleep" /> </com.example.zhy_arcmenu.ArcMenu>
嗯。第一个元素为button,其它的都是菜单项了~~喜欢用代码的,也能够代码生成,我是比較喜欢布局文件里写这些玩意~
9、MainActivity
package com.example.zhy_arcmenu; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.Window; import android.widget.ImageView; import android.widget.Toast; import com.example.zhy_arcmenu.ArcMenu.OnMenuItemClickListener; public class MainActivity extends Activity { private ArcMenu mArcMenuLeftTop; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mArcMenuLeftTop = (ArcMenu) findViewById(R.id.id_arcmenu1); //动态加入一个MenuItem ImageView people = new ImageView(this); people.setImageResource(R.drawable.composer_with); people.setTag("People"); mArcMenuLeftTop.addView(people); mArcMenuLeftTop .setOnMenuItemClickListener(new OnMenuItemClickListener() { @Override public void onClick(View view, int pos) { Toast.makeText(MainActivity.this, pos + ":" + view.getTag(), Toast.LENGTH_SHORT) .show(); } }); } }
结束~~有不论什么意见欢迎指出~~
以上是关于Android 自己定义ViewGroup手把手教你实现ArcMenu的主要内容,如果未能解决你的问题,请参考以下文章
恭喜发财! -- 手把手教你仿造一个qq下拉抢红包 Android自定义view
Android自己定义组件系列——自己定义View及ViewGroup