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Android卫星菜单效果的实现方法

程序员文章站 2023-12-13 13:09:22
android小白第一次写博客,心情无比激动。下面给大家展示一下卫星菜单的实现。 1.简单介绍卫星菜单 在应用程序中,有很多展示菜单的方式,但其功能都是大同小异,这样一...

android小白第一次写博客,心情无比激动。下面给大家展示一下卫星菜单的实现。

1.简单介绍卫星菜单

在应用程序中,有很多展示菜单的方式,但其功能都是大同小异,这样一来,菜单的美观以及展示方式就显的尤为重要,卫星菜单就是很不错的一种。下面是本案例的gif图:

Android卫星菜单效果的实现方法 

2.学习本案例需要的知识点

(1)动画

(2)自定义viewgroup

(3)自定义属性

a、attr.xml

b、在布局中使用自定义属性

c、在代码中获取自定义属性值

3.首先分析我们的卫星菜单需要那些自定义属性并书写代码

首先,菜单可以显示在屏幕的四个角,所以我们需要一个属性来确定它的位置,菜单在屏幕的四个角比较美观,在这里用到枚举。

其次,我们还需要一个展开半径,因此还需要自定义半径。

下面是attr.xml

<?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="satemenu">
  <attr name="radius" />
  <attr name="position" />
 </declare-styleable>
</resources>

4.自定义viewgroup

–继承viewgroup 以相关属性

public class satemenu extends viewgroup implements view.onclicklistener {
 private int animationtime; //动画时间
 private int radius; //展开半径
 private int pos; //从自定义属性中获取的菜单位置
 private state state; //菜单状态
 private int l = 0, t = 0; //左上值
 private view centerbtn = null; //展开按钮
 private menuitemlistener menuitemlistener; //菜单项点击监听
 private position position; //枚举型菜单位置
 private enum position { //位置枚举
  left_top, left_bottom, right_top, right_bottom
 }
 private enum state { //菜单状态枚举
  open, colse
 }

–构造方法

public satemenu(context context) {
  //一个参数构造方法调用两个参数构造方法
  this(context, null);
 }
 public satemenu(context context, attributeset attrs) {
  //两个参数构造方法调用三个个参数构造方法
  this(context, attrs, 0);
 }
 public satemenu(context context, attributeset attrs, int defstyleattr) {
  super(context, attrs, defstyleattr);
  animationtime = 500; //设置动画展开时间
  typedarray a = context.gettheme().obtainstyledattributes(attrs, r.styleable.satemenu, defstyleattr, 0); //获取自定义属性值集合
  radius = (int) a.getdimension(r.styleable.satemenu_radius,
    typedvalue.applydimension(typedvalue.complex_unit_dip, 100, getresources().getdisplaymetrics())); //获取半径并转化为像素值
  state = state.colse; //设置菜单默认关闭
  pos = a.getint(r.styleable.satemenu_position, 0); //获取位置
  //将位置转化为枚举值 (这样就把无意义的int转化为有意义的枚举值)
  switch (pos) {
   case 0:
    position = position.left_top;
    break;
   case 1:
    position = position.left_bottom;
    break;
   case 2:
    position = position.right_top;
    break;
   case 3:
    position = position.right_bottom;
    break;
  }
 }

–重写onmeasure方法

@override
 protected void onmeasure(int widthmeasurespec, int heightmeasurespec) {
  super.onmeasure(widthmeasurespec, heightmeasurespec);
  int count = getchildcount();
  //测量子view
  for (int i = 0; i < count; i++) {
   measurechild(getchildat(i), widthmeasurespec, heightmeasurespec);
  }
 }

–重写onlayout方法

 @override
 protected void onlayout(boolean changed, int l, int t, int r, int b) {
  if (changed)
   btnlayout();
 }
 private void btnlayout() {
  centerbtn = getchildat(0);
  if (position == position.right_bottom || position == position.right_top) {
   //如果菜单设置在屏幕的右侧,那么展开按钮的l值=viewgroup宽度-按钮宽度
   l = getmeasuredwidth() - centerbtn.getmeasuredwidth();
  }
  if (position == position.left_bottom || position == position.right_bottom) {
   //如果菜单设置在屏幕的下边,那么展开按钮的t值=viewgroup高度-按钮高度
   t = getmeasuredheight() - centerbtn.getmeasuredheight();
  }
  //设置展开按钮位置
  centerbtn.layout(l, t, l + centerbtn.getmeasuredwidth(), t + centerbtn.getmeasuredheight());
  childbtnlayout(); //设置子按钮位置
  centerbtn.setonclicklistener(this);
 }

–设置子按钮位置需要一点点数学知识,下面我以主菜单在右下角为例,画一个简图,图片对应右侧第一个公式

Android卫星菜单效果的实现方法

 private void childbtnlayout() {
  int childmunecount = getchildcount() - 1;
  //角度等于90度/子按钮个数-1
  float a = (float) (math.pi / 2 / (childmunecount - 1));
  int cl, ct; //分别是子按钮的 左 上 
  for (int i = 0; i < childmunecount; i++) {
   if (position == position.right_bottom || position == position.right_top) {
    cl = (int) (l - radius * math.cos(i * a));
   } else {
    cl = (int) (l + radius * math.cos(i * a));
   }
   if (position == position.left_top || position == position.right_top) {
    ct = (int) (t + radius * math.sin(i * a));
   } else {
    ct = (int) (t - radius * math.sin(i * a));
   }
   view childview = getchildat(i + 1);
   childview.layout(cl, ct, cl + childview.getmeasuredwidth(), ct + childview.getmeasuredheight());
   childview.setonclicklistener(this);
   childview.settag(i);
   childview.setvisibility(view.gone);
  }
 }

–动画的展开与关闭,这里没有用属性动画,原理是:当用户关闭菜单的时候,将子按钮隐藏,打开才打的时候在把子按钮显示出来

 private void changestate() {
  int childmunecount = getchildcount() - 1;
  //设置展开按钮旋转动画
  animation animation = new rotateanimation(0, 360, centerbtn.getmeasuredwidth() / 2, centerbtn.getmeasuredheight() / 2);
  animation.setduration(animationtime);
  centerbtn.setanimation(animation);
  animation.start();
  view childview;
  //子按钮有两个动画(位移、旋转),所以这里用到动画集,这里也涉及到一些数学知识,和之前设置子按钮位置差不多
  animationset animationset;
  animation translateanimation;
  animation rotateanimation;
  int cl, ct;
  float a = (float) (math.pi / 2 / (childmunecount - 1));
  if (state == state.open) {
   state = state.colse;
   for (int i = 0; i < childmunecount; i++) {
    if (position == position.right_bottom || position == position.right_top)
     cl = (int) (radius * math.cos(i * a));
    else
     cl = (int) (-radius * math.cos(i * a));
    if (position == position.left_top || position == position.right_top)
     ct = (int) (-radius * math.sin(i * a));
    else
     ct = (int) (radius * math.sin(i * a));
    childview = getchildat(i + 1);
    childview.setvisibility(view.gone);
    translateanimation = new translateanimation(0, cl, 0, ct);
    translateanimation.setduration(animationtime);
    rotateanimation = new rotateanimation(0, 360, childview.getmeasuredheight() / 2, childview.getmeasuredheight() / 2);
    rotateanimation.setduration(animationtime);
    animationset = new animationset(true);
    animationset.addanimation(rotateanimation);
    animationset.addanimation(translateanimation);
    childview.setanimation(animationset);
    animationset.start();
    childview.setvisibility(view.gone);
   }
  } else {
   state = state.open;
   for (int i = 0; i < childmunecount; i++) {
    if (position == position.right_bottom || position == position.right_top)
     cl = (int) (radius * math.cos(i * a));
    else
     cl = (int) (-radius * math.cos(i * a));
    if (position == position.left_top || position == position.right_top)
     ct = (int) (-radius * math.sin(i * a));
    else
     ct = (int) (radius * math.sin(i * a));
    childview = getchildat(i + 1);
    childview.setvisibility(view.gone);
    translateanimation = new translateanimation(cl, 0, ct, 0);
    translateanimation.setduration(animationtime);
    rotateanimation = new rotateanimation(360, 0, childview.getmeasuredheight() / 2, childview.getmeasuredheight() / 2);
    rotateanimation.setduration(animationtime);
    animationset = new animationset(true);
    animationset.addanimation(rotateanimation);
    animationset.addanimation(translateanimation);
    childview.setanimation(animationset);
    animationset.start();
    childview.setvisibility(view.visible);
   }
  }
 }

–写到这里我们的卫星菜单已经可以展现出来的,运行一下,效果还是不错的。美中不足的是,子按钮还没有点击事件,下面我们就将这个小小的不足补充一下。我们可以通过给子按钮添加点击事件来监听它,但点击之后要做的事情不可能写在viewgroup中,这就需要用接口进行回调。大家看一下在设置子按钮位置的时候有这样一句代码 childview.settag(i); 它的目的就是给子按钮添加索引,接下来看一下具体怎样实现的。

 @override
 public void onclick(view v) {
  if (v.getid() == centerbtn.getid()) {
   changestate();
  } else {
   if (menuitemlistener != null) {
    menuitemlistener.onclick((integer) v.gettag());
   }
  }
 }
 public interface menuitemlistener {
  void onclick(int position);
 }
 public void setmenuitemlistener(menuitemlistener menuitemlistener) {
  this.menuitemlistener = menuitemlistener;
 }

–到这里我们已经完全实现了卫星菜单的所有功能,但大家有没有发现,一些菜单在展开之后,我们点击其他区域,菜单会自动收起来,所以我们还要给我们的viewgroup添加ontouchevent事件,在菜单展开的时候,他把菜单收起来,并将此次点击拦截。

 @override
 public boolean ontouchevent(motionevent event) {
  if (state == state.open) {
   changestate();
   return true; //拦截
  }
  return super.ontouchevent(event);
 }

5.下面试用一下我们编写的卫星菜单,看一下成果。

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 xmlns:wzw="http://schemas.android.com/apk/res/com.satemenudemo"
 android:layout_width="match_parent"
 android:layout_height="match_parent">
 <com.satemenudemo.satemenu
  android:id="@+id/menu_id"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:layout_margin="3dp"
  wzw:position="right_bottom"
  wzw:radius="150dp">
  <imagebutton
   android:id="@+id/center_btn"
   android:layout_width="40dp"
   android:layout_height="40dp"
   android:background="@drawable/add" />
  <imagebutton
   android:id="@+id/menu1"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:background="@drawable/find" />
  <imagebutton
   android:id="@+id/menu2"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:background="@drawable/shop" />
  <imagebutton
   android:id="@+id/menu3"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:background="@drawable/people" />
  <imagebutton
   android:id="@+id/menu4"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:background="@drawable/love" />
 </com.satemenudemo.satemenu>
</relativelayout>

mainactivity.java

public class mainactivity extends activity {
 @override
 protected void oncreate(bundle savedinstancestate) {
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.activity_main);
  satemenu satemenu = (satemenu) findviewbyid(r.id.menu_id);
  satemenu.setmenuitemlistener(new satemenu.menuitemlistener() {
   @override
   public void onclick(int position) {
    toast.maketext(mainactivity.this, "-- "+position, toast.length_short).show();
   }
  });
 }
}

以上所述是小编给大家介绍的android卫星菜单效果的实现方法,希望对大家有所帮助

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