android - Android:无法替换viewpager中的 fragment

Question

嗨，我已经试了两周了，仍然无法用另一个在viewpager中替换一个片段。我在viewpager中有三个片段作为选项卡，当我单击第一个片段中的按钮时，我想用fourthfragment替换第一个片段。我在做下面的动作，但不起作用

 productDetailFragment = new PlaceSearchFragment();            
    FragmentTransaction transaction = getFragmentManager().beginTransaction();
    transaction.addToBackStack("fh");
    transaction.replace(R.id.maincontainer,productDetailFragment,"yourfragment").commit();

下面是我使用viewpager的主要活动

public class MainActivity extends FragmentActivity implements
        ActionBar.TabListener {

    private ViewPager viewPager;
    private TabsPagerAdapter mAdapter;
    private ActionBar actionBar;
    // Tab titles
    private String[] tabs = { "New", "Recent", "All" };


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Initilization
        viewPager = (ViewPager) findViewById(R.id.pager);
        actionBar = getActionBar();
        mAdapter = new TabsPagerAdapter(getSupportFragmentManager());

        viewPager.setAdapter(mAdapter);


        // Adding Tabs
        for (String tab_name : tabs) {

            actionBar.addTab(actionBar.newTab().setText(tab_name)
                    .setTabListener(this));

        }


        viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {

            @Override
            public void onPageSelected(int position) {
                // on changing the page
                // make respected tab selected
                actionBar.setSelectedNavigationItem(position);
            }

            @Override
            public void onPageScrolled(int arg0, float arg1, int arg2) {
            }

            @Override
            public void onPageScrollStateChanged(int arg0) {
            }
        });
    }

    @Override
    public void onTabReselected(Tab tab, FragmentTransaction ft) {
    }

    @Override
    public void onTabSelected(Tab tab, FragmentTransaction ft) {
        // on tab selected
        // show respected fragment view
        viewPager.setCurrentItem(tab.getPosition());

    }

    @Override
    public void onTabUnselected(Tab tab, FragmentTransaction ft) {
    }
}}

下面是我的FragmentPageAdapter

public class TabsPagerAdapter extends FragmentPagerAdapter {

    public TabsPagerAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int index) {

        switch (index) {
        case 0:
            // Top Rated fragment activity
            return new GetRideFragment();
        case 1:
            // Games fragment activity
            return new PostRideFragment();
        case 2:
            // Movies fragment activity
            return new SearchRidesFragment();
        }

        return null;
    }

    @Override
    public int getCount() {
        // get item count - equal to number of tabs
        return 3;
    }

}

找了很多遍，尝试了很多不同的方法，但是我没能成功。任何有效的例子或解决方法都会很有帮助。任何帮助都是非常感谢的

Answer 1

我知道这个问题已经过时了，但由于它没有被标记为已回答或已解决，这里有一个提示：您是否尝试将操作栏的导航设置为“导航模式”选项卡？

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    // Initilization
    viewPager = (ViewPager) findViewById(R.id.pager);
    actionBar = getActionBar();
    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); // <-- here