连续show两次，报错

[myface-wang]

java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
at android.view.ViewGroup.addViewInner(ViewGroup.java:4310)
at android.view.ViewGroup.addView(ViewGroup.java:4146)
at android.view.ViewGroup.addView(ViewGroup.java:4118)
at com.mingle.sweetpick.CustomDelegate.show(CustomDelegate.java:124)
at com.mingle.sweetpick.SweetSheet.show(SweetSheet.java:115)
at com.acgcode.template.MainActivity$1.onClick(MainActivity.java:81)
at android.view.View.performClick(View.java:5207)
at android.view.View$PerformClick.run(View.java:21177)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5458)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:738)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:628)

应该是控件内部没有执行完，需要考虑执行完才能进行下一次show

[myface-wang]

需要增加对执行完成的监听（show完成，dismiss完成）