最近试着做了个Android 带有弹出收缩动画的扇形菜单，留个笔记记录一下。

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效果如下

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

  private ImageView imgPublish;
  private TextView textView1;
  private TextView textView2;

  private boolean isMenuOpen = false;

  private List textViews = new ArrayList<>();


  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    imgPublish = (ImageView) findViewById(R.id.img_publish);
    textView1 = (TextView) findViewById(R.id.tv_1);
    textView2 = (TextView) findViewById(R.id.tv_2);

    textViews.add(textView1);
    textViews.add(textView2);

    imgPublish.setOnClickListener(this);
  }

  @Override
  public void onClick(View v) {
    switch (v.getId()) {
      case R.id.img_publish:

        if (!isMenuOpen) {
          showOpenAnim(80);
          imgPublish.setImageResource(R.mipmap.publish_select);
        }else {
          showCloseAnim(80);
          imgPublish.setImageResource(R.mipmap.fabu);
        }
        break;
    }

  }

  //打开扇形菜单的属性动画， dp为半径长度
  private void showOpenAnim(int dp) {
    textView1.setVisibility(View.VISIBLE);
    textView2.setVisibility(View.VISIBLE);


    //for循环来开始小图标的出现动画
    for (int i = 0; i < textViews.size(); i++) {
      AnimatorSet set = new AnimatorSet();
      //标题1与x轴负方向角度为20°，标题2为100°，转换为弧度
      double a = -Math.cos(20 * Math.PI / 180 * (i * 2 + 1));
      double b = -Math.sin(20 * Math.PI / 180 * (i * 2 + 1));
      double x = a * dip2px(dp);
      double y = b * dip2px(dp);

      set.playTogether(
          ObjectAnimator.ofFloat(textViews.get(i), "translationX", (float) (x * 0.25), (float) x),
          ObjectAnimator.ofFloat(textViews.get(i), "translationY", (float) (y * 0.25), (float) y)
          , ObjectAnimator.ofFloat(textViews.get(i), "alpha", 0, 1).setDuration(2000)
      );
      set.setInterpolator(new BounceInterpolator());
      set.setDuration(500).setStartDelay(100);
      set.start();

      set.addListener(new Animator.AnimatorListener() {
        @Override
        public void onAnimationStart(Animator animation) {

        }

        @Override
        public void onAnimationEnd(Animator animation) {

          //菜单状态置打开
          isMenuOpen = true;
        }

        @Override
        public void onAnimationCancel(Animator animation) {

        }

        @Override
        public void onAnimationRepeat(Animator animation) {

        }
      });
    }

    //转动加号大图标本身45°
    ObjectAnimator rotate = ObjectAnimator.ofFloat(imgPublish, "rotation", 0, 90).setDuration(300);
    rotate.setInterpolator(new BounceInterpolator());
    rotate.start();

  }

  //关闭扇形菜单的属性动画，参数与打开时相反
  private void showCloseAnim(int dp) {


    //for循环来开始小图标的出现动画
    for (int i = 0; i < textViews.size(); i++) {
      AnimatorSet set = new AnimatorSet();
      double a = -Math.cos(20 * Math.PI / 180 * (i * 2 + 1));
      double b = -Math.sin(20 * Math.PI / 180 * (i * 2 + 1));
      double x = a * dip2px(dp);
      double y = b * dip2px(dp);

      set.playTogether(
          ObjectAnimator.ofFloat(textViews.get(i), "translationX", (float) x, (float) (x * 0.25)),
          ObjectAnimator.ofFloat(textViews.get(i), "translationY", (float) y, (float) (y * 0.25)),
          ObjectAnimator.ofFloat(textViews.get(i), "alpha", 1, 0).setDuration(2000)
      );
//      set.setInterpolator(new AccelerateInterpolator());
      set.setDuration(500);
      set.start();

      set.addListener(new Animator.AnimatorListener() {
        @Override
        public void onAnimationStart(Animator animation) {

        }

        @Override
        public void onAnimationEnd(Animator animation) {

          textView1.setVisibility(View.GONE);
          textView2.setVisibility(View.GONE);

          //菜单状态置关闭
          isMenuOpen = false;
        }

        @Override
        public void onAnimationCancel(Animator animation) {

        }

        @Override
        public void onAnimationRepeat(Animator animation) {

        }
      });
    }


    //转动加号大图标本身45°
    ObjectAnimator rotate = ObjectAnimator.ofFloat(imgPublish, "rotation", 0, 90).setDuration(300);
    rotate.setInterpolator(new BounceInterpolator());
    rotate.start();


  }

  private int dip2px(int value) {
    float density = getResources()
        .getDisplayMetrics().density;
    return (int) (density * value + 0.5f);
  }

}

新闻名称：Android带有弹出收缩动画的扇形菜单实例-创新互联
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