阴影背景 bg_shadow_white.xml
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入动画 pop_enter_anim.xml
出动画 pop_exit_anim.xml
动画 样式
点击显示、隐藏
final PopupWindow popupWindow=new PopupWindow(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT);
popupWindow.setOutsideTouchable(true);
popupWindow.setFocusable(true);
popupWindow.setTouchable(true);
popupWindow.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));//部分系统如果不设置透明背景时无法点击外部隐藏
popupWindow.setAnimationStyle(R.style.popwin_anim_style);
View view =LayoutInflater.from(context).inflate(R.layout.pop_menu_item,null,false);
popupWindow.setContentView(view);
int[] location=new int[2];
iv.getLocationInWindow(location);//iv 为所在屏幕位置
int x=location[0]-(MainActivity.metrics.widthPixels/2)+dp2px(context,22f);//x 偏移量根据自己需求调节
int y= location[1]+dp2px(context,25f);//y 偏移量根据自己需求调节
popupWindow.showAtLocation(iv, Gravity.NO_GRAVITY, x, y);