单击对话框时，替换位于另一个片段之上的片段（视页）

Question

我试图打开一个片段，当一个对话框被点击在另一个片段。我在用ActionBarSherlock和Tab。我的片段附在视图页中。我几乎完成了这项工作。但是我不能替换视图页内的新片段。我有个错误。我读了这里的线程。解决办法还不清楚。

10-18 21:34:40.379:e/AndroidRuntime(19618):致命异常：main 10-18 21:34:40.379:e/AndroidRuntime(19618):java.lang.illegalArgumentException:未找到ID0x7f040032(com.example.actionBartestWithSherlock:id/pager)for fragment AllContactsFragment{41fd4BA0#0 id=0x7f040032}的视图

我有三个与分页程序相关的片段，分别名为FragmentTab1、FragmentTab2和fragmenttab3。

我的MainActivity&FragmentAdapter如下所示：

  public class MainActivity extends SherlockFragmentActivity {

    ActionBar.Tab Tab1, Tab2, Tab3, Tab4;
    private Context context = this;
    // view pager
    // Declare Variables
    ActionBar actionBar;
    ViewPager mPager;
    Tab tab;
    FragmentAdapter mAdapter;

    @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);

        // Locate ViewPager in activity_main.xml
        mPager = (ViewPager) findViewById(R.id.pager);
        // add an adapter to pager
        mPager.setAdapter(new FragmentAdapter(getSupportFragmentManager(),
                mPager, actionBar));

        addActionBarTabs();
    }

    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);
        }
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
    }

    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) {
        }
    };

class FragmentAdapter extends FragmentPagerAdapter implements
            ViewPager.OnPageChangeListener {

        private ViewPager mViewPager;
        final int TOTAL_PAGES = 3;

        public FragmentAdapter(FragmentManager fm, ViewPager pager,
                ActionBar actionBar) {
            super(fm);
            this.mViewPager = pager;
            this.mViewPager.setOnPageChangeListener(this);
        }

        @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);
            }
        }

        @Override
        public int getCount() {
            return TOTAL_PAGES;
        }

        @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);
        }
    }
}

现在，在我的第一个选项卡FragmentTab1中，当单击按钮时，我打开一个定制的对话框。当对话框选项被选中时，我希望替换FragmentTab1中的新片段AllContactsFragment。

FragmentTab1片段类：

public class FragmentTab1 extends SherlockFragment implements OnClickListener {

Button btnTest;
ViewPager pager;
LinearLayout layoutBlockNumbers;
LinearLayout layoutContact, layoutCallLog, layoutSMSLog, layoutManually;
Context context;
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;

@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);
    return rootView;

}

@Override
public void onClick(View v) {

    if (v == layoutCallLog) {

        dialog.dismiss();
        // want to replace new fragment at position 0 in pager
        // problem is here ??? how to open new fragmnet
        Fragment allContactsFragment = AllContactsFragment.newInstance();
        FragmentTransaction transaction = getChildFragmentManager()
                .beginTransaction();
        transaction.addToBackStack(null);
        transaction.replace(R.id.pager, allContactsFragment).commit();

    }

    if (v == layoutBlockNumbers) {
        // open a dialog
        showDialog();
    } else if (v == layoutContact) {
        openContactList();
        dialog.dismiss();
    } else if (v == layoutSMSLog) {
    }
}

@Override
public void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    setUserVisibleHint(true);
}

// open a dialog
private void showDialog() {
    dialog = new CustomizedDialog(getActivity());
    dialog.setContentView(R.layout.dialog_add_number_type);
    dialog.setTitle("Add Black List Number");

    //initialize all linear layouts in dialog
    layoutCallLog = (LinearLayout) dialog.findViewById(R.id.layoutCallLog);
    layoutContact = (LinearLayout) dialog.findViewById(R.id.layoutContact);
    layoutSMSLog = (LinearLayout) dialog.findViewById(R.id.layoutSMSLog);
    layoutManually = (LinearLayout) dialog
            .findViewById(R.id.layoutManually);

    // add listener to several linear layout
    layoutContact.setOnClickListener(this);
    layoutCallLog.setOnClickListener(this);
    layoutSMSLog.setOnClickListener(this);
    layoutManually.setOnClickListener(this);

    dialog.show();
}

public static Fragment newInstance() {
    Fragment f = new FragmentTab1();
    return f;
} 
}

   <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <android.support.v4.view.ViewPager
        android:id="@+id/pager"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" >
    </android.support.v4.view.ViewPager>

</RelativeLayout>

有人能帮我解决这个问题吗？很抱歉有这么多代码。

Answer 1

我不确定你能按你想的方式做事。viewpager的设置方式与正常容器/片段的设置方式不同。在viewpager中，不是使用片段事务来添加片段，而是使用适配器从支持列表加载片段实例。

然后，替换该片段的工作方式如下：

（1）创建要添加的片段的实例（2）将该片段添加到支持PagerAdapter的列表中（3）显示新片段（4）删除旧片段

在当前项目中实现这一点的问题是适配器的设置。目前，您使用的开关状态只能返回固定数量的片段。您的适配器应该这样设置。

class MyPageAdapter extends FragmentPagerAdapter{
    private List<Fragment> fragments  
    public MyPageAdapter(FragmentManager fm, List<Fragment> fragments) { 
        super(fm); 
        this.fragments = fragments; 
    } 

    @Override  
    public Fragment getItem(int position) { 
        return this.fragments.get(position);   
    }   

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

然后，您只需向适配器类添加一个方法即可添加或移除新片段。如果您知道要替换的片段的索引，那么完成这个任务应该非常容易。您所要做的就是创建联系人片段的新实例，并将其添加到数组或列表中。本文将解释viewpager如何处理新内容的添加/删除，以及如何确保显示新片段。