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。

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<TextView> 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); }}

布局文件

<?xml version="1.0" encoding="utf-8"?> <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.example.lina.animationapplication.MainActivity"> <TextView android:id="@+id/tv_1" android:layout_width="40dp" android:layout_height="40dp" android:layout_gravity="bottom|end" android:layout_marginBottom="40dp" android:layout_marginRight="40dp" android:gravity="center" android:text="标题1" android:textColor="#ffffff" android:visibility="gone" android:background="@drawable/circle_purple" /> <TextView android:id="@+id/tv_2" android:layout_width="40dp" android:layout_height="40dp" android:layout_gravity="bottom|end" android:layout_marginBottom="40dp" android:layout_marginRight="40dp" android:gravity="center" android:text="标题2" android:textColor="#ffffff" android:visibility="gone" android:background="@drawable/circle_orange"/> <ImageView android:id="@+id/img_publish" android:layout_width="60dp" android:layout_height="60dp" android:layout_gravity="bottom|end" android:layout_marginBottom="35dp" android:layout_marginRight="35dp" android:src="@mipmap/fabu" /> </FrameLayout>

circle_purple.xml

<?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="oval"> <solid android:color="#5d2a89" /></shape>

参考

Android开罐头———快速打造扇形卫星菜单

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