Question

我尝试将值从xml array传递给Listfragment。

public class TabsPagerAdapter extends FragmentPagerAdapter {

    static Context context;
    static Resources res = null;
    static String[] CONTENT = null;


    public TabsPagerAdapter(FragmentManager fm, Context c) {
        super(fm);

        context = c;


    }


    @Override
    public ListFragment getItem(int index) {


        res = context.getResources();
        CONTENT = res.getStringArray(R.array.trg_values);

          ListFragment fragment = new DaerahFragment();
            Bundle args = new Bundle();
            args.putString("daerah", CONTENT[index] ); 
            fragment.setArguments(args);
            return fragment;

    }



    @Override
    public int getCount() {
        // get item count - equal to number of tabs
        return 7;
    }
}

这是我的xml

    <string-array name="trg_values">
    <item name="Kuala Terengganu">1</item>
    <item name="Marang">2</item>
    <item name="Dungun">3</item>
    <item name="Kemaman">4</item>
    <item name="Hulu Terengganu">5</item>
    <item name="Setiu">6</item>
    <item name="Besut">7</item>

</string-array>

错误：

08-03 16:12:00.992: E/AndroidRuntime(28017): java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources android.content.Context.getResources()' on a null object reference
08-03 16:12:00.992: E/AndroidRuntime(28017):    at com.jkmt.ppbanjir.adapter.TabsPagerAdapter.getItem(TabsPagerAdapter.java:62)

适配器的实例化

mAdapter = new TabsPagerAdapter(getSupportFragmentManager(), null); 
viewPager.setAdapter(mAdapter);

Answer 1

问题在于这一行

LC_ALL=en_GB.ascii python

您将null作为mAdapter = new TabsPagerAdapter(getSupportFragmentManager(), null);传递，并将null分配给适配器中的成员。调用getItem并引用成员时，应用程序崩溃Context。用

更改它

NullPointerException

如果您在mAdapter = new TabsPagerAdapter(getSupportFragmentManager(), this);或

内

Activity

如果你在mAdapter = new TabsPagerAdapter(getSupportFragmentManager(), getActivity());

里面

pageradapter中的getResources数组xml

1 个答案: