如何刷新 FragmentPagerAdapter 的片段? [英] How to refresh a Fragment of a FragmentPagerAdapter?

问题描述

我使用 TabPageIndicator 和 FragmentPagerAdapter 库获得了 2 个名为 tab1(主页)和 tab2(配置文件)的标签.

I have got 2 tabs called tab1 (home) and tab2 (profile) using TabPageIndicator and FragmentPagerAdapter libraries.

在 tab2 中，我有一个名为登录"的按钮(tab2 膨胀 abc.xml).

In tab2, I have a button named "Log in" (tab2 inflates abc.xml).

当用户点击登录"按钮时，应用将在新活动中显示一个登录表单.登录后，活动结束，tab2 的内容视图将发生变化(它显示用户的个人资料，因为它会膨胀 xyz.xml).我该怎么做?

When users click "log in" button, the app will show a login form in a new activity. After logging in, the activity finishes and the content view of tab2 will change ( it shows user's profile because it will inflate xyz.xml). How can I do that?

public class MainActivity extends SherlockFragmentActivity {
    private static String[] TAB_NAMES = null;
    private Context context = this;
    private static FragmentPagerAdapter adapter ;
    @Override
    protected void onCreate(Bundle savedInstanceState) {

        if (TAB_NAMES == null) {
            TAB_NAMES = new String[] {
                    getResources().getString(R.string.tab_home),
                    getResources().getString(R.string.tab_profile) };
        }
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        adapter = new TabsAdapter(
                getSupportFragmentManager());

        ViewPager pager = (ViewPager) findViewById(R.id.pager);

        pager.setAdapter(adapter);


        TabPageIndicator indicator = (TabPageIndicator) findViewById(R.id.indicator);
        indicator.setViewPager(pager);

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater infalter = getSupportMenuInflater();
        infalter.inflate(R.menu.main_menu, menu);
        return true;
    }

    class TabsAdapter extends FragmentPagerAdapter {
        public TabsAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int position) {
            switch (position) {
            case 0:
                return HomeFragment.getInstance();
            case 1:
                return new ProfileFragment();

            default:
                return HomeFragment.getInstance();
            }
        }
        }

推荐答案

你可以使用 FragmentStatePagerAdapter 而不是 FragmentPagerAdapter

You can use FragmentStatePagerAdapter instead of FragmentPagerAdapter

你可以这样试试:

private static FragmentStatePagerAdapter adapter ;
private static String[] TAB_NAMES = null;

@Override
protected void onCreate(Bundle savedInstanceState) {

    if (TAB_NAMES == null) {
        TAB_NAMES = new String[] {
                getResources().getString(R.string.tab_home),
                getResources().getString(R.string.tab_profile) };
    }
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    adapter = new FragmentStatePagerAdapter(getSupportFragmentManager()) {
        @Override
        public Fragment getItem(int position) {
            switch (position) {
                case 0:
                    return HomeFragment.getInstance();
                case 1:
                    return new ProfileFragment();

                default:
                    return HomeFragment.getInstance();
            }
        }

        @Override
        public int getCount() {
            return TAB_NAMES.length;
        }

        @Override
        public int getItemPosition(Object fragItem) {
            int position = 0;
            if (fragItem instanceof HomeFragment) {
                position = 0;
            } else if (fragItem instanceof  ProfileFragment) {
                position = 1;
            }
            return (position >= 0) ? position : POSITION_NONE;
        }
    }

    ViewPager pager = (ViewPager) findViewById(R.id.pager);
    pager.setAdapter(adapter);


    TabPageIndicator indicator = (TabPageIndicator) findViewById(R.id.indicator);
    indicator.setViewPager(pager);

}

参考

您可以查看这个解决方案.

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