Question

snackbar在popupwindow中无法正常工作。这是我试过的代码。首先我创建了popupwindow

    //popupwindow
    LayoutInflater inflater = (LayoutInflater) AddMembersToEventActivity.this.getSystemService(LAYOUT_INFLATER_SERVICE);
    View editFamilyPopupView = inflater.inflate(R.layout.activity_edit_family_member_popup,null);
    final RelativeLayout parentLayout = (RelativeLayout)editFamilyPopupView.findViewById(R.id.parent_layout);
    final PopupWindow editFamilyPopupWindow = new PopupWindow(
            editFamilyPopupView,
            RelativeLayout.LayoutParams.MATCH_PARENT,
            RelativeLayout.LayoutParams.MATCH_PARENT
    );
    ....

调用snakcbar方法

    showSnackBar(getString(R.string.rashi_msg),parentLayout);
    ...

显示小吃栏

    //show snackbar
public void showSnackBar(String message,ViewGroup viewGroup){
    Snackbar snackbar = Snackbar
            .make(viewGroup, message, Snackbar.LENGTH_LONG);

    snackbar.show();
}
    //...
    //exception
    02-20 13:52:20.747 20762-20762/divine.calcify.com.divine E/AndroidRuntime: FATAL EXCEPTION: main
                                                                       Process:
                                                                       java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.Context android.view.ViewGroup.getContext()' on a null object reference
                                                                           at android.support.design.widget.Snackbar.<init>(Snackbar.java:188)
                                                                           at android.support.design.widget.Snackbar.make(Snackbar.java:220)
                                                                           at divine.calcify.activities.AddMembersToEventActivity.showSnackBar(AddMembersToEventActivity.java:866)
                                                                           at divine.calcify.activities.AddMembersToEventActivity$9.onClick(AddMembersToEventActivity.java:663)
                                                                           at android.view.View.performClick(View.java:4856)
                                                                           at android.view.View$PerformClick.run(View.java:19956)
                                                                           at android.os.Handler.handleCallback(Handler.java:739)
                                                                           at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                           at android.os.Looper.loop(Looper.java:211)
                                                                           at android.app.ActivityThread.main(ActivityThread.java:5389)
                                                                           at java.lang.reflect.Method.invoke(Native Method)
                                                                           at java.lang.reflect.Method.invoke(Method.java:372)
                                                                           at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1020)
                                                                           at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:815)

如何让小吃栏出现在弹出窗口上方？

Answer 1

您收到该异常是因为Snackbar无法附加到view。

更详细地说明实际发生的事情是Snackbar在viewGroup上调用getContext()，这似乎是null并导致异常被引发。

P.S。请注意，链接指向View.getContext()，但可以ViewGroup继承。{/ p>

如何让小吃栏出现在弹出窗口上方？

1 个答案: