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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