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();

}
}

感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！