片段中的Android Snackbar NullPointerException [英] Android Snackbar NullPointerException in Fragment

问题描述

我想在我的应用程序中添加一个基本的快餐栏，但是我收到一个错误，我不知道为什么.

I want to add a basic snackbar to my application but i have received an error that i couldn't figure out why.

我在Fragment的onCreateView()方法中添加了此代码.

I added this code in the onCreateView() method in my Fragment.

Snackbar.make(view, "Snackbar", Snackbar.LENGTH_LONG)
            .setAction("Action", null).show();

并收到此错误:

06-01 10:26:09.955    1232-1232/? E/ActivityThread﹕ Failed to find provider  info for me.muraterdogan.watchme.MetricaContentProvider
06-01 10:26:10.075    1232-1447/? E/ActivityThread﹕ Failed to find provider info for me.muraterdogan.watchme.YPLContentProvider
06-01 10:33:55.044    6646-6646/? E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: me.muraterdogan.watchme, PID: 6646
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:116)
        at android.support.design.widget.Snackbar.make(Snackbar.java:140)
        at me.muraterdogan.watchme.fragments.TrendingFragment.GetData(TrendingFragment.java:90)
        at me.muraterdogan.watchme.fragments.TrendingFragment.onCreateView(TrendingFragment.java:83)
...

推荐答案

如果将片段添加到现有活动中(请记住，您可以通过xml添加它)，则应将SnackBar的方法调用到片段的onActivityCreated()方法中

If your Fragment is added to existing activity(Remember you can add it through xml), you should call the SnackBar's method into the onActivityCreated() method of the Fragment.

@Override
public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    Snackbar.make(view, "Snackbar", Snackbar.LENGTH_LONG)
        .setAction("Action", null).show();
}

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