Android 动态菜单实现实例代码

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", 0, translationx),
        objectanimator.offloat(btnitem, "translationy", 0, translationy),
        objectanimator.offloat(btnitem, "scalex", 0, 1),
        objectanimator.offloat(btnitem, "scaley", 0, 1),
        objectanimator.offloat(btnitem, "alpha", 0, 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 index, int total, 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", translationx, 0),
        objectanimator.offloat(btnitem, "translationy", translationy, 0),
        objectanimator.offloat(btnitem, "scalex", 1f, 0f),
        objectanimator.offloat(btnitem, "scaley", 1f, 0f),
        objectanimator.offloat(btnitem, "alpha", 1f, 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, "translationx", 0, translationx),
    objectanimator.offloat(btnitem, "translationy", 0, translationy),

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, 0, 5, 300);
      btnitemstartanimator(btnitem2, 1, 5, 300);
      btnitemstartanimator(btnitem3, 2, 5, 300);
      btnitemstartanimator(btnitem4, 3, 5, 300);
      btnitemstartanimator(btnitem5, 4, 5, 300);

    } else {
      //此时menu是打开的
      ismenuopen = false;
      btnitemcloseanimator(btnitem1, 0, 5, 300);
      btnitemcloseanimator(btnitem2, 1, 5, 300);
      btnitemcloseanimator(btnitem3, 2, 5, 300);
      btnitemcloseanimator(btnitem4, 3, 5, 300);
      btnitemcloseanimator(btnitem5, 4, 5, 300);
    }
  }

  /**
   * 关闭动画
   *
   * @param btnitem
   * @param index
   * @param total
   * @param radius
   */
  private void btnitemcloseanimator(view btnitem, int index, int total, 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", translationx, 0),
        objectanimator.offloat(btnitem, "translationy", translationy, 0),
        objectanimator.offloat(btnitem, "scalex", 1f, 0f),
        objectanimator.offloat(btnitem, "scaley", 1f, 0f),
        objectanimator.offloat(btnitem, "alpha", 1f, 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, 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", 0, translationx),
        objectanimator.offloat(btnitem, "translationy", 0, translationy),
        objectanimator.offloat(btnitem, "scalex", 0, 1),
        objectanimator.offloat(btnitem, "scaley", 0, 1),
        objectanimator.offloat(btnitem, "alpha", 0, 1)
    );
    set.setinterpolator(new bounceinterpolator());

    set.setduration(500).start();


  }
}

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