相关疑难解决方法(0)

我知道如何使用View.getRootView()获取根视图.我也能从一个按钮的onClick事件中获取视图,其中参数是一个视图.但是如何在活动中获取视图？

我想在我的应用程序中添加一个基本的快餐栏,但我收到一个错误,我无法弄清楚为什么.

我在片段中的onCreateView()方法中添加了这段代码.

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)
...

我搜索了很多，但是找不到任何解决方案并小吃吧是不是片段类中的工作没有帮助。我传递了片段的rootView，还尝试从getActivity传递视图，但是它们都不起作用！

   @Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    rootView = inflater.inflate(R.layout.content_dialog_bottom_sheet, container, false);

Snackbar.make(MyActivity.myTextview, "Hello", Snackbar.LENGTH_INDEFINITE).show();

Snackbar.make(rootView, "Hello", Snackbar.LENGTH_INDEFINITE).show();

return rootView;

}

和我的content_dialog_bottom_sheet：

 <RelativeLayout 
   xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   android:id="@+id/bottomSheetLayout"
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
   android:background="@color/background"
   app:behavior_hideable="true"
   app:behavior_peekHeight="180dp"
   app:layout_behavior="@string/bottom_sheet_behavior">

  //some views 

</RelativeLayout>