ViewPager中的ListFragments

时间:2013-03-03 18:39:49

标签: android android-fragments android-viewpager android-pageradapter

我正在编写我的第一个基于片段的应用,并遇到了一些我无法通过API或Stackoverflow解决的重大问题。

我正在使用 viewPager 在两个列表之间滑动。每个列表都有一个标题按钮,用于创建新的列表元素(类似于本机android警报应用程序)。该按钮当前返回错误消息以进行调试。

问题是:

  • FragmentList A返回FragmentList B的调试消息
  • FragmentList B不返回调试消息

     ... // The main class
    public class DemoApp extends FragmentActivity implements ActionBar.TabListener {
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    
    setContentView(R.layout.main);
    
    // Set up the action bar.
    final ActionBar actionBar = getActionBar();
    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
    
    PageAdapter mPageAdapter = new PageAdapter(getSupportFragmentManager());
    mViewPager = (ViewPager) findViewById(R.id.pager);
    mViewPager.setAdapter(mPageAdapter);
    
    mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
        @Override
        public void onPageSelected(int position) {
            actionBar.setSelectedNavigationItem(position);
        }
    });
    
    for (int i = 0; i < mPageAdapter.getCount(); i++) {
        actionBar.addTab(actionBar.newTab().setText(mPageAdapter.getPageTitle(i)).setTabListener(this));
    }
    }
    ...
    

我的自定义 PageAdapter 将创建两个列表framgent对象:

public class PageAdapter extends FragmentStatePagerAdapter {

private final int NUMBER_PAGES = 2;

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

@Override
public Fragment getItem(int position) {
    if (position == 0) {
        return new FoodListFragment();
    } else if (position == 1){
        return new LocationListFragment();
    } else {
        throw new IllegalArgumentException("Invalid page position: " + position);
    }
}


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

...

}

FoodListFragment snipped(除调试输出外,其他列表看起来很相似):

public class FoodListFragment extends ListFragment implements LoaderCallbacks<Cursor> {
/*
 * (non-Javadoc)
 * 
 * @see android.support.v4.app.Fragment#onActivityCreated(android.os.Bundle)
 */
@Override
public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);

    // add a list header with the button to create a new list item
    View v = getActivity().getLayoutInflater().inflate(R.layout.list_header, null);
    getListView().addHeaderView(v);

...
    setListAdapter(getSomeAdapter());

    // get the list header button
    ImageButton createItem = (ImageButton) getActivity().findViewById(R.id.create_new_entry);

    createItem.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            Log.e(LOG_TAG, "onclick FoodListFragment");
        }
    });

}

main.xml中:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/wrapper"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<android.support.v4.view.ViewPager
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/pager"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    tools:context=".DemoApp" />

</LinearLayout>

1 个答案:

答案 0 :(得分:0)

我发现了这个错误。在每个列表中,我调用相同的标题视图和相同的标题按钮。无法明确指定onClick方法