Android开发中利用ObjectAnimator实现ArcMenu

本文介绍利用ObjectAnimator简单地实现ArcMenu，直接使用本文的ArcMenu类即可快捷地实现菜单功能。

最终使用效果

先看下最终的使用效果：

private int[] imageRes = {R.id.img_menu, R.id.img_menu1, R.id.img_menu2, R.id.img_menu3, 
R.id.img_menu4, R.id.img_menu5};private ArcMenu arcMenu;
...//初始化，参数为资源图片id
 arcMenu = new ArcMenu(this, imageRes);//点击事件，这边使用了annotation，直接使用findViewById然后设置监听事件也可以
    @Click
    public void img_menu() {
        mylog.d(" @Click img_menu");
        arcMenu.switchMenu();
    }    @Click
    public void img_menu1() {
        arcMenu.clickItem();
        mylog.d(" @Click img_menu1");
    }    @Click
    public void img_menu2() {
        arcMenu.clickItem();
        mylog.d(" @Click img_menu2");
    }    @Click
    public void img_menu3() {
        arcMenu.clickItem();
        mylog.d(" @Click img_menu3");
    }    @Click
    public void img_menu4() {
        arcMenu.clickItem();
        mylog.d(" @Click img_menu4");
    }    @Click
    public void img_menu5() {
        arcMenu.clickItem();
        mylog.d(" @Click img_menu5");
    }

布局文件中，将需要用到的图片放在同一位置。

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/widget33"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#262a34">

    <ImageView
        android:id="@+id/img_menu"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:layout_marginRight="10dp"
        android:layout_marginBottom="10dp"
        android:class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="@drawable/menu_add" />

    <ImageView
        android:id="@+id/img_menu1"
        android:visibility="gone"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:layout_marginRight="10dp"
        android:layout_marginBottom="10dp"
        android:class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="@drawable/float_on" />

    <ImageView
        android:id="@+id/img_menu2"
        android:visibility="gone"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:layout_marginRight="10dp"
        android:layout_marginBottom="10dp"
        android:class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="@drawable/float_on" />

    <ImageView
        android:id="@+id/img_menu3"
        android:visibility="gone"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:layout_marginRight="10dp"
        android:layout_marginBottom="10dp"
        android:class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="@drawable/float_on" />

    <ImageView
        android:id="@+id/img_menu4"
        android:visibility="gone"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:layout_marginRight="10dp"
        android:layout_marginBottom="10dp"
        android:class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="@drawable/float_on" />

    <ImageView
        android:id="@+id/img_menu5"
        android:visibility="gone"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:layout_marginRight="10dp"
        android:layout_marginBottom="10dp"
        android:class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="@drawable/float_on" /></RelativeLayout>

下面为截图;

具体实现

初始化，通过imageRes的数量设置相邻两个图标之间的角度，同时将imageView加入imageViewList中，方便后面使用

public class ArcMenu {    private Activity context;    private int[] imageRes;    private List<ImageView> imageViewList = new ArrayList<>();    private boolean isShowMenu = false;    int radius = 180;    double angle;    public ArcMenu(Activity context, int[] imageRes) {
        angle = Math.PI / 2 / (imageRes.length - 2);
        radius = Tool.dip2px(context, radius);        this.context = context;        this.imageRes = imageRes;        for (int imagRe : imageRes) {
            ImageView imageView = (ImageView) context.findViewById(imagRe);
            imageViewList.add(imageView);
        }
    }
}

菜单弹出动画，使用ObjectAnimator，对每一个图标进行平移操作，第0个图标为菜单开关，加入旋转动画。

private void openMenu() {
        isShowMenu = true;
        setItemVisible(true);
        ObjectAnimator animator1;
        ObjectAnimator animator2;
        List<ObjectAnimator> objectAnimators = new ArrayList<>();
        AnimatorSet set = new AnimatorSet();        for (int i = 1; i < imageRes.length; i++) {
            animator1 = ObjectAnimator.ofFloat(imageViewList.get(i), 
"translationX", (float) (-radius * Math.sin(angle * (i-1))));
            animator2 = ObjectAnimator.ofFloat(imageViewList.get(i), "translationY", 
(float) (-radius * Math.cos(angle * (i-1))));
            objectAnimators.add(animator1);
            objectAnimators.add(animator2);
        }        for (int i = 0; i < objectAnimators.size(); i++) {            set.playTogether(objectAnimators.get(i));
        }        set.setDuration(200);        set.start();        //第0个图标，菜单图标，加入动画
        ObjectAnimator.ofFloat(imageViewList.get(0),"rotation",0,135f).setDuration(200).start();
    }

同理，关闭菜单

private void closeMenu() {
        isShowMenu = false;
        ObjectAnimator animator1 = null;
        ObjectAnimator animator2;
        List<ObjectAnimator> objectAnimators = new ArrayList<>();
        AnimatorSet set = new AnimatorSet();        for (int i = 1; i < imageRes.length; i++) {
            animator1 = ObjectAnimator.ofFloat(imageViewList.get(i), "translationX",  0);
            animator2 = ObjectAnimator.ofFloat(imageViewList.get(i), "translationY",  0);
            objectAnimators.add(animator1);
            objectAnimators.add(animator2);
        }

        animator1.addListener(new AnimatorListenerAdapter() {
            @Override            public void onAnimationEnd(Animator animation) {
                setItemVisible(false);
                super.onAnimationEnd(animation);
            }
        });        for (int i = 0; i < objectAnimators.size(); i++) {            set.playTogether(objectAnimators.get(i));
        }        set.setDuration(200);        set.start();
        ObjectAnimator.ofFloat(imageViewList.get(0),"rotation",135f,0).setDuration(200).start();
    }

切换菜单开关

public void switchMenu() {        if (isShowMenu) {
            closeMenu();
        } else {
            openMenu();
        }
    }

图标被点击后，将所有子图标隐藏，同时调用closMenu()，将图片移回原处。

public void clickItem() {
        setItemVisible(false);
        closeMenu();
    }    private void setItemVisible(boolean isVisible) {        for (int i = 1; i < imageRes.length; i++)  {            if (isVisible) {
                imageViewList.get(i).setVisibility(View.VISIBLE);
            } else {
                imageViewList.get(i).setVisibility(View.GONE);
            }
        }
    }

总结

至此，整个功能大致完成。现有的功能默认arcmenu为界面右下角，其他位置相应地修改公式即可以实现，可自行进行拓展，兼容不同位置。

本文链接：http://www.codeceo.com/article/android-objectanimator-arcmenu.html
本文作者：码农网 – 苏耀东