为什么使用getResources()。getString()是否返回null?

试试看:

如果您将其写入片段:

String[] days = getActivity().getResources().getStringArray(R.array.days);

如果您在活动中写入此内容:

String[] days = this.getResources().getStringArray(R.array.days);

这只是一个假设,但大多数情况下,如果有人遇到这个错误,他们就会在代码的位置或调用代码时出错。例如,如果在onCreate()之前调用它:

public class YourActivity extends Activity {

private String foo = "foo";
private String[] yourArray = getResources().getStringArray(R.array.yourArray);

    public void onCreate(Bundle savedInstanceState){
        ...
    }
}

这将导致NullPointerException。相反,你必须这样称呼它:

public class YourActivity extends Activity {

private String foo = "foo";
private String[] yourArray;

    public void onCreate(Bundle savedInstanceState) {
        setContentView(R.layout.yourLayout);
        yourArray = getResources().getStringArray(R.array.yourArray);
    }
}

试试这个。

public class YourActivity extends Activity{
Context mContext;

public void onCreate(Bundle savedInstanceState){
       setContentView(R.layout.yourLayout);   
       mContext = this;                  
}

class DialogFragment{
 String[] days = mContext.getResources().getStringArray(R.array.days);
...............
  }
}

我希望这有帮助!