我想在我的应用程序中添加一个基本的快餐栏,但是我收到了一个我无法弄清原因的错误。
我在Fragment的onCreateView()方法中添加了此代码。
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)
...
如果将Fragment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Fragment的onActivityCreated()方法中。
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
Snackbar.make(view, "Snackbar", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
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