Android 动态菜单实现实例代码

概述Android动态菜单先上效果图比较简单，主要就是属性动画的使用和坐标角度的小细节。

AndroID 动态菜单

先上效果图

比较简单，主要就是属性动画的使用和坐标角度的小细节。

实现

实现效果：
图标按照路径一路缩放渐变过来即可。

核心代码

 /**   * Item开启动画   *   * @param btnItem   * @param index   * @param total   * @param radius   */  private voID btnItemStartAnimator(VIEw btnItem,int index,int total,int radius) {    if (btnItem.getVisibility() != VIEw.VISIBLE) {      btnItem.setVisibility(VIEw.VISIBLE);    }    double degree = Math.toradians(90) / (total - 1) * index;//Math中根据度数得到弧度值的函数    int translationX = -(int) (radius * Math.sin(degree));    int translationY = -(int) (radius * Math.cos(degree));    AnimatorSet set = new AnimatorSet();    //实现平移缩放和透明动画    set.playTogether(        ObjectAnimator.offloat(btnItem,"translationX",translationX),ObjectAnimator.offloat(btnItem,"translationY",translationY),"scaleX",1),"scaleY","Alpha",1)    );    set.setInterpolator(new BounceInterpolator());    set.setDuration(500).start();  }  /**   * Item关闭动画   *   * @param btnItem   * @param index   * @param total   * @param radius   */  private voID btnItemCloseAnimator(VIEw btnItem,int radius) {    double degree = Math.PI * index / ((total - 1) * 2);    int translationX = -(int) (radius * Math.sin(degree));    int translationY = -(int) (radius * Math.cos(degree));    AnimatorSet set = new AnimatorSet();    //包含平移、缩放和透明度动画    set.playTogether(        ObjectAnimator.offloat(btnItem,translationX,0),translationY,1f,0f),0f));    set.setDuration(500).start();    if (btnItem.getVisibility() == VIEw.VISIBLE) {      btnItem.setVisibility(VIEw.INVISIBLE);    }  }

item开启动画和关闭动画为一个逆过程，体现在x，y距离变化上。

x，y的距离开启时距离逐渐增长

ObjectAnimator.offloat(btnItem,

这里要注意下sin这些弧度的计算，可以使用Math.toRadins(数字)

 double degree = Math.toradians(90) / (total - 1) * index;//Math中根据度数得到弧度值的函数    int translationX = -(int) (radius * Math.sin(degree));

或者使用PI=180°来折算

 double degree = Math.PI * index / ((total - 1) * 2);     int translationX = -(int) (radius * Math.sin(degree));

实例代码：

package xsf.customVIEw;import androID.animation.AnimatorSet;import androID.animation.ObjectAnimator;import androID.vIEw.VIEw;import androID.vIEw.animation.BounceInterpolator;import androID.Widget.button;import androID.Widget.Toast;import xsf.customVIEw.base.BaseActvity;public class StatelliteActivity extends BaseActvity {  private button btnMenu,btnItem1,btnItem2,btnItem3,btnItem4,btnItem5;  private boolean isMenuOpen = false;  @OverrIDe  protected int setLayoutResourceID() {    return R.layout.activity_statellite;  }  @OverrIDe  protected voID initVIEw() {    btnMenu = (button) findVIEwByID(R.ID.btnMenu);    btnMenu.setonClickListener(this);    btnItem1 = (button) findVIEwByID(R.ID.btnItem1);    btnItem1.setonClickListener(this);    btnItem2 = (button) findVIEwByID(R.ID.btnItem2);    btnItem2.setonClickListener(this);    btnItem3 = (button) findVIEwByID(R.ID.btnItem3);    btnItem3.setonClickListener(this);    btnItem4 = (button) findVIEwByID(R.ID.btnItem4);    btnItem4.setonClickListener(this);    btnItem5 = (button) findVIEwByID(R.ID.btnItem5);    btnItem5.setonClickListener(this);  }    @OverrIDe  public voID onClick(VIEw v) {    btnMenu.requestFocus();    switch (v.getID()) {      case R.ID.btnMenu:        showItemAnimator();        break;      case R.ID.btnItem1:        Toast.makeText(StatelliteActivity.this,"点击了Item1",Toast.LENGTH_SHORT).show();        break;      case R.ID.btnItem2:        Toast.makeText(StatelliteActivity.this,"点击了Item2",Toast.LENGTH_SHORT).show();        break;      case R.ID.btnItem3:        Toast.makeText(StatelliteActivity.this,"点击了Item3",Toast.LENGTH_SHORT).show();        break;      case R.ID.btnItem4:        Toast.makeText(StatelliteActivity.this,"点击了Item4",Toast.LENGTH_SHORT).show();        break;      case R.ID.btnItem5:        Toast.makeText(StatelliteActivity.this,"点击了Item5",Toast.LENGTH_SHORT).show();        break;    }  }  private voID showItemAnimator() {    if (!isMenuOpen) {      //此时menu是关闭的      isMenuOpen = true;      btnItemStartAnimator(btnItem1,5,300);      btnItemStartAnimator(btnItem2,1,300);      btnItemStartAnimator(btnItem3,2,300);      btnItemStartAnimator(btnItem4,3,300);      btnItemStartAnimator(btnItem5,4,300);    } else {      //此时menu是打开的      isMenuOpen = false;      btnItemCloseAnimator(btnItem1,300);      btnItemCloseAnimator(btnItem2,300);      btnItemCloseAnimator(btnItem3,300);      btnItemCloseAnimator(btnItem4,300);      btnItemCloseAnimator(btnItem5,300);    }  }  /**   * 关闭动画   *   * @param btnItem   * @param index   * @param total   * @param radius   */  private voID btnItemCloseAnimator(VIEw btnItem,0f));    set.setDuration(500).start();    if (btnItem.getVisibility() == VIEw.VISIBLE) {      btnItem.setVisibility(VIEw.INVISIBLE);    }  }  /**   * 开启动画   *   * @param btnItem   * @param index   * @param total   * @param radius   */  private voID btnItemStartAnimator(VIEw btnItem,1)    );    set.setInterpolator(new BounceInterpolator());    set.setDuration(500).start();  }}

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