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  • Android 自定义ViewGroup手把手教你实现ArcMenu

    转载请标明出处:http://blog.csdn.net/lmj623565791/article/details/37567907

    逛eoe发现这样的UI效果,感觉很不错,后来知道github上有这么个开源项目~~~~当然本篇不是教你如何使用这个开源项目,而是教你如何自己通过自定义ViewGroup写这样的效果,自定义ViewGroup也是我的痛楚,嘿嘿,希望以此可以抛砖引玉~~

    效果图:



    1、实现思路

    通过效果图,会有几个问题:

    a、动画效果如何实现

    可以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虽然有动画效果,但是本质是不会改变按钮的位置,我们的按钮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;这样可能比较麻烦,其实我们可以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、如何确定位置呢?

    这可能需要一点数学上的知识,我画了一张草图(冰天雪地,跪玻璃碴子求画下面这些图的工具):


    每次会根据子菜单数量,算出a这个角度,然后通过sin , cos 分别算出每个子菜单的left , top ;

    当然这是在左上的情况,如果在右上,则top还是和左上一致的,left则为 (屏幕宽度-左上算出的left) ;其他两个方位同理~


    整体我通过自定义一个ViewGroup,这个ViewGroup中第一个子元素为点击的按钮(你可以随便布局,随便用什么控件),接下来的子元素我认为是菜单项。根据效果图,决定展开半径和显示的位置,让用户自己去定制。下面看具体实现:

    2、自定义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();
    	}
    

    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);
    
    			}
    		}
    	}

    首先在layoutButton中对按钮位置就行设置,以及初始化点击事件;然后从第二个子元素开始为菜单项,分别设置其位置,计算的原理就是上面我画的草图,可以再去仔细看看,动手在纸上画一画。

    	/**
    	 * 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);
    
    	}

    这是定位Button的代码,此时的代码已经实现了定位,如果你把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、设置按钮点击事件

    /**
    	 * 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() +"");
    	}
    

    点击时,触发TanslateAnimation动画,从定点向外扩展,也给点击按钮添加了一个旋转动画,每个子菜单项同样添加了旋转动画,且如果用户设置回调,调用回调接口;设置子菜单的点击事件。整体就是点击然后动画效果~~

    7、设置子菜单的点击事件

    /**
    	 * 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;
    	}

    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~有兴趣的可以改成自己喜欢的动画~

    注:动画效果很多借鉴了eoe上那位仁兄的代码,这类动画也比较简单,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,第一个元素为按钮,其他的都是菜单项了~~喜欢用代码的,也可以代码生成,我是比较喜欢布局文件中写这些玩意~

    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);
    		//动态添加一个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~~有任何意见欢迎指出~~


    源码点击下载



    版权声明:本文为博主原创文章,未经博主允许不得转载。

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  • 原文地址:https://www.cnblogs.com/dingxiaoyue/p/4924925.html
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