Question

好吧，考虑一下我有两个片段 FragmentTab1 ＆amp;的 ShowAllContactFragment 即可。 FragmentTab1 包含列表视图＆amp;还有一个按钮。单击按钮时，我在viewpager中替换ShowAllContactFragment。当显示 ShowAllContactFragment 时，用户可以通过选择列表视图中的复选框来选择多个联系人。它还有一个 ADD 联系人按钮。

我需要什么：当用户在此列表视图中选择一些联系人后，在ShowAllContactFragment中按 ADD 按钮时，我想更新FragmentTab1中的现有列表视图。我还删除了ShowAllContactFragment，并在发生这种情况时显示FragmentTab1。

我的解决状态：我按照android developers论坛通过活动在片段之间传递数据。我就快完成了。我在ShowAllContactFragment＆amp;中创建了Interface OnContactSelectedListener。在MainActivity中实现。一切都好！。调试后，我检查了我在 MainActivity 中有数据的回调方法，但是我无法替换ShowAllContactFragment＆amp;无法显示之前的片段FragmentTab1＆amp;更新它的列表视图。

要从FragmentTab1打开ShowAllContactFragment，我写道：

ShowAllContactFragment allContactsFragment = new ShowAllContactFragment();

            FragmentTransaction transaction = getFragmentManager()
                    .beginTransaction();
            transaction.addToBackStack(null);
            transaction.add(R.id.fragmentTabLayout1, allContactsFragment);
            transaction.commit();

我的主要活动＆amp; FragmentAdapter看起来：

public class MainActivity extends SherlockFragmentActivity implements
        ShowAllContactFragment.OnContactSelectedListener {

    ActionBar.Tab Tab1, Tab2, Tab3, Tab4;
    private Context context = this;
    // view pager
    // Declare Variables
    ActionBar actionBar;
    ViewPager mPager;
    Tab tab;
    FragmentAdapter mAdapter;
    List<Fragment> fragmentList = new ArrayList<Fragment>();
    ArrayList<Person> blackListPersonList;

    private final static String TAG_FRAGMENT = "TAG_FRAGMENT";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // set application in portrait mode
        ActivityHelper.initialize(this);

        actionBar = getSupportActionBar();
        actionBar.setDisplayShowHomeEnabled(true);
        actionBar.setDisplayShowTitleEnabled(true);
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
        addFragmentsInList();
        // Locate ViewPager in activity_main.xml
        mPager = (ViewPager) findViewById(R.id.pager);
        // add an adapter to pager
        mAdapter = new FragmentAdapter(getSupportFragmentManager(), mPager,
                actionBar, fragmentList);
        mPager.setAdapter(mAdapter);
        addActionBarTabs();

    }

    public void addFragmentsInList() {

        FragmentTab1 aFragmentTab1 = new FragmentTab1();

        fragmentList.add(new FragmentTab1());
        fragmentList.add(new FragmentTab2());
        fragmentList.add(new FragmentTab3());

    }

    private void addActionBarTabs() {

        String[] tabs = { "Tab 1", "Tab 2", "Tab 3" };
        for (String tabTitle : tabs) {
            ActionBar.Tab tab = actionBar.newTab().setText(tabTitle)
                    .setTabListener(tabListener);
            actionBar.addTab(tab);

        }

    }

    private ActionBar.TabListener tabListener = new ActionBar.TabListener() {
        @Override
        public void onTabSelected(ActionBar.Tab tab, FragmentTransaction ft) {
            mPager.setCurrentItem(tab.getPosition());
        }

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

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

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // add action menu here
        MenuInflater inflater = getSupportMenuInflater();
        inflater.inflate(R.menu.activity_itemlist, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle presses on the action bar items
        switch (item.getItemId()) {
        case R.id.add_item:
            // openSearch();
            Toast.makeText(context, " add_item  ", Toast.LENGTH_SHORT).show();
            return true;
        case R.id.about:
            // composeMessage();
            Toast.makeText(context, "   about", Toast.LENGTH_SHORT).show();
            return true;
        default:
            return super.onOptionsItemSelected(item);
        }
    }

    class FragmentAdapter extends FragmentPagerAdapter implements
            ViewPager.OnPageChangeListener {

        private ViewPager mViewPager;
        final int TOTAL_PAGES = 3;
        private List<Fragment> fragments;
        SparseArray<Fragment> registeredFragments = new SparseArray<Fragment>();

        public FragmentAdapter(FragmentManager fm, ViewPager pager,
                ActionBar actionBar, List<Fragment> fragmentsList) {
            super(fm);
            this.mViewPager = pager;
            this.mViewPager.setOnPageChangeListener(this);
            this.fragments = fragmentsList;
        }

        @Override
        public Fragment getItem(int position) {
            // switch (position) {
            // case 0:
            // return FragmentTab1.newInstance();
            // case 1:
            // return FragmentTab2.newInstance();
            // case 2:
            // return FragmentTab3.newInstance();
            // default:
            // throw new IllegalArgumentException(
            // "The item position should be less or equal to:"
            // + TOTAL_PAGES);
            // }

            return this.fragments.get(position);
        }

        @Override
        public int getCount() {
            // return TOTAL_PAGES;
            return this.fragments.size();

        }

        public ViewPager getViewPager() {

            return mViewPager;
        }

        // added newly
        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            Fragment fragment = (Fragment) super.instantiateItem(container,
                    position);
            registeredFragments.put(position, fragment);
            return fragment;
        }

        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            registeredFragments.remove(position);
            super.destroyItem(container, position, object);
        }

        public Fragment getRegisteredFragment(int position) {
            return registeredFragments.get(position);
        }

        @Override
        public void onPageScrollStateChanged(int arg0) {

        }

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

        }

        @Override
        public void onPageSelected(int position) {
            actionBar.setSelectedNavigationItem(position);
        }
    }

    @Override
    public void onBackPressed() {

        Log.e(TAG_FRAGMENT, "onBackPressed");

        FragmentManager fm = getSupportFragmentManager();
        if (fm.getBackStackEntryCount() > 0) {
            Log.i("MainActivity", "popping backstack");
            fm.popBackStack();
        } else {
            Log.i("MainActivity", "nothing on backstack, calling super");
            super.onBackPressed();
        }

    }


    @Override
    public void onContactSelected(ArrayList<Person> contactNumberlist) {
        // data comes here, no problem.
        this.blackListPersonList = contactNumberlist;
        Log.d("onContactSelected", "onContactSelected");

        // get error here
        FragmentTab1 aFragmentTab1 = (FragmentTab1) mAdapter.getItem(0);

        if (aFragmentTab1 != null) {
            aFragmentTab1.updateFragment1(blackListPersonList);
        }
        FragmentTransaction transaction = getSupportFragmentManager()
                .beginTransaction();

        transaction.add(R.id.fragment_all_contacts_layout, aFragmentTab1);
        transaction.commit();

    }

    public ArrayList<Person> getBlackListContacts() {

        return blackListPersonList;
    }

    // public Fragment getFragment(ViewPager pager){
    // Fragment theFragment = fragments.get(pager.getCurrentItem());
    // return theFragment;
    // }

}

FrgmentTab1看起来：

  public class FragmentTab1 extends SherlockFragment implements OnClickListener {

    Button btnTest;
    ViewPager pager;
    LinearLayout layoutBlockNumbers;
    LinearLayout layoutContact, layoutCallLog, layoutSMSLog, layoutManually;
    public Context mContext;
    CustomizedDialog dialog;
    private static final int CONTACT_PICKER_RESULT = 1001;
    private static final String DEBUG_TAG = "Contact List";
    private static final double RESULT_OK = -1;

    ListView listViewOnlyBlackListNumber;
    ArrayList<Person> personList;
    BlackListAdapter aBlackListAdapter;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {

        View rootView = inflater.inflate(R.layout.fragmenttab1, container,
                false);

        layoutBlockNumbers = (LinearLayout) rootView
                .findViewById(R.id.layoutAddBlockNumbers);
        layoutBlockNumbers.setOnClickListener(this);

        listViewOnlyBlackListNumber = (ListView) rootView
                .findViewById(R.id.listViewOnlyBlackListNumber);

        personList = ((MainActivity) getActivity()).getBlackListContacts();

        if (personList != null) {
            aBlackListAdapter = new BlackListAdapter(getActivity(), personList,
                    m_onSelectedEventCalender);
            listViewOnlyBlackListNumber.setAdapter(aBlackListAdapter);

        } else {
            listViewOnlyBlackListNumber.setEmptyView(container);
        }

        return rootView;

    }

    public void updateFragment1(ArrayList<Person> personList) {

        // trying to update when came back here
        aBlackListAdapter = new BlackListAdapter(getActivity(), personList,
                m_onSelectedEventCalender);

        listViewOnlyBlackListNumber.setAdapter(aBlackListAdapter);
        aBlackListAdapter.notifyDataSetChanged();
    }
}

在MainActivity中的onContactSelected中获取错误

       10-30 00:22:29.674: E/AndroidRuntime(26834): FATAL EXCEPTION: main
     java.lang.IllegalStateException: Can't change container ID of fragment FragmentTab1{42d27380 #0 id=0x7f040032 android:switcher:2130968626:0}: was 2130968626 now 2130968638
   E/AndroidRuntime(26834):     at android.support.v4.app.BackStackRecord.doAddOp(BackStackRecord.java:407)
     E/AndroidRuntime(26834):   at android.support.v4.app.BackStackRecord.add(BackStackRecord.java:384)
     E/AndroidRuntime(26834):   at com.mobigic.callblocker.MainActivity.onContactSelected(MainActivity.java:240)

希望，有人帮助我。

Answer 1

你的问题不是很清楚，特别是关于你如何处理这些碎片的部分。就像您在显示ShowAllContactFragment片段时所说的布局一样？从您发布的代码来看，您似乎是盲目地在包含ShowAllContactFragment的布局中直接添加ViewPager片段。

与错误相关，您通过FragmentManager的适配器获得ViewPager已管理的其中一个片段的引用，然后您重试将其添加到事务中，该操作将失败。如果您在显示和使用FragmentTab1片段后尝试显示之前显示的ShowAllContactFragment片段，则应尝试简单地删除FragmentManager的最后一次记录操作它的popBackStack...()方法。

编辑：我查看了您的代码，但您所做的仍然不明确。我已经查看了主要活动的布局，但是你没有一个ID为R.id.fragment_all_contacts_layout的容器，所以我假设您试图插入新的{{}}在FragmentTab1的布局中{1}}实际上没有任何意义（更不用说你将FragmentTab1添加到ID为ShowAllContactFragment的容器中了也看不到）。无论如何，我假设您希望R.id.fragmentTabLayout1 替换来自ShowAllContactFragment的{{1}}。为此，您需要一个包装器片段来保存两个嵌套片段，并启用它们之间的通信。例如包装器片段：

FragmentTab1

这将是您在ViewPager的适配器中使用的片段，而不是public static class WrapperFragment extends Fragment implements OnContactSelectedListener { private static final String TAG_FIRST = "tag_first"; private static final String TAG_SECOND = "tag_second"; private static final int CONTENT_ID = 1000; private FragmentTab1 mFrag1; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { FrameLayout content = new FrameLayout(getActivity()); content.setId(CONTENT_ID); if (getChildFragmentManager().findFragmentByTag(TAG_SECOND) == null) { mFrag1 = (FragmentTab1) getChildFragmentManager() .findFragmentByTag(TAG_FIRST); if (mFrag1 == null) { mFrag1 = new FragmentTab1(); getChildFragmentManager().beginTransaction() .add(CONTENT_ID, mFrag1, TAG_FIRST).commit(); } } return content; } @Override public void onContactSelected(List<Person> contactNumberlist) { getChildFragmentManager().popBackStackImmediate(); mFrag1.updateFragment1(contactNumberlist); } public void showPickerfragment() { getChildFragmentManager().beginTransaction() .replace(CONTENT_ID, new ShowAllContactFragment()) .addToBackStack(null).commit(); } }片段。请注意，它实现了ViewPager接口。您还需要对代码的其他部分进行一些更改：

FragmentTab1

需要修改OnContactSelectedListener以将选择事件发送到实现其接口的包装器片段：

@Override
public void onClick(View v) {
     if (v == layoutCallLog) {
     dialog.dismiss();
             // make the wrapper fragment to open the ShowAllContactFragment fragment
            ((WrapperFragment) getParentFragment()).showPickerfragment();
            // rest of the code

在ShowAllContactFragment中显示@Override public void onClick(View v) { if (v == btnAdd) { Toast.makeText(getActivity(), "" + blockListedPersonList.size(), Toast.LENGTH_SHORT).show(); ((OnContactSelectedListener) getParentFragment()) .onContactSelected(blockListedPersonList); } }时处理BACK按钮的主要活动中：

ShowAllContactFragment

请记住，您需要保存嵌套片段的数据。

Answer 2

您好我在不同的项目中使用FragmentActivity和ViewPager并且有两个解决方案

1：您可以在FragmentTab1上使用onHiddenChanged（boolean hidden）方法。

@Override public void onHiddenChanged(boolean hidden) { // TODO Auto-generated method stub if(!hidden) { //check if personList size is changed and then call updateFragment1() methode } super.onHiddenChanged(hidden); }

2：如果你喜欢使用静态方法，你可以使updateFragment1（）方法静态，所以当用户按ADD调用updateFragment1（）。

希望有所帮助

如何在返回viewpager中的上一个片段时更新片段中的listview

2 个答案: