Using context in a fragment

How can I get the context in a fragment?

I need to use my database whose constructor takes in the context, but getApplicationContext() and FragmentClass.this don't work so what can I do?

Database constructor

public Database(Context ctx)
{
    this.context = ctx;
    DBHelper = new DatabaseHelper(context);
}

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You can use getActivity() , which returns the activity associated with a fragment.
The activity is a context (since Activity extends Context).

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要做到上面的答案，你可以重写片段的onAttach方法：

public static class DummySectionFragment extends Fragment{
...
    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        DBHelper = new DatabaseHelper(activity);
    }
}

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始终使用getActivity（）方法获取所连接活动的上下文，但始终记住一件事情：片段稍微不稳定，并且getActivity有时会返回null，因此，在获取上下文之前，始终检查片段的isAdded（）方法getActivity() 。

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