所以我有一个带有 3 个 actionbar.Tabs 的应用程序，可以在 3 个片段之间切换。在其中两个片段中，我需要一个在大约 6 个 ListView 之间切换的 ViewPager。问题是我试图让它工作的片段显示页面只显示黑色......总是......我已经确认我可以显示其他东西（我试着让我的 SherlockFragment 成为 SherlockListFragment 我可以显示数据）。所以问题仅限于我的适配器和我的 ViewPager，以及将它们放置到位的代码。哦，我还应该提到我正在使用 ActionBarSherlock 和（试图）ViewPagerIndicator。我已经正确导入（最后）。
所以这是我的片段的代码：
import vt.finder.schedule.Schedule;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import com.actionbarsherlock.app.SherlockFragment;
import com.viewpagerindicator.TitlePageIndicator;
public class FreeTimeFragment extends SherlockFragment {
//~Data Fields--------------------------------------------
/**
* Adapter used for swiping between days.
*/
private ViewPager dayPage;
/**
* The DayAdapter that is used to switch between course Lists for each day for the listView.
*/
private DayAdapter dayAdapt;
//~Constructors--------------------------------------------
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
View view = onCreateView(getLayoutInflater(savedInstanceState), null, savedInstanceState);
LinearLayout layout = (LinearLayout) view.findViewById(R.id.linear_layout);
dayPage = (ViewPager) layout.findViewById(R.id.free_time_day_pager);
Schedule freeTime = getArguments().getParcelable("freeTime");
dayAdapt = new DayAdapter(freeTime);
//Bind the title indicator to the adapter
TitlePageIndicator titleIndicator = (TitlePageIndicator) layout.findViewById(R.id.titles);
dayPage.setAdapter(dayAdapt);
titleIndicator.setViewPager(dayPage);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.free_time_fragment_layout, container, false);
return view;
}
}
这是我的适配器的代码：
import vt.finder.schedule.Course;
import vt.finder.schedule.Schedule;
import android.content.Context;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
/**
* PageAdapter class, provides functionality for switching between days of
* the week.
*
*
*/
public final class DayAdapter extends PagerAdapter {
//~Data Fields----------------------------------------//
/**
* The list adapter that the current list is being handed to.
*/
private Schedule schedule;
//~Constructors---------------------------------------//
public DayAdapter(Schedule theSchedule) {
schedule = theSchedule;
}
//~Methods--------------------------------------------//
@Override
public Object instantiateItem(ViewGroup container, int index) {
ListView view = new ListView(container.getContext());
view.setAdapter(new ArrayAdapter<Course>(container.getContext(),
R.layout.list_view_child, schedule.getDay(curIndex).getList()));
((ViewPager) container).addView(view, 0);
return container;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
ViewPager pager = (ViewPager) container;
View view = (View) object;
pager.removeView(view);
}
/**
* Gets the pageTitle, which is the name of the day that is at position.
*
* @param position the index of the day selected.
* @return the name of the day the index refers to.
*/
@Override
public CharSequence getPageTitle(int position) {
return schedule.getDay(position).getThisDay();
}
@Override
public int getCount() {
return 6;
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == (View) object;
}
}
这是我的片段布局的 xml 文件：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:weightSum="1"
android:id="@+id/linear_layout">
<com.viewpagerindicator.TitlePageIndicator
android:id="@+id/titles"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1.09" />
<android.support.v4.view.ViewPager
android:id="@+id/free_time_day_pager"
android:layout_width="fill_parent"
android:layout_height="284dp" />
<RelativeLayout
android:id="@+id/relativeLayout1"
android:layout_width="match_parent"
android:layout_height="52dp"
android:layout_weight="0.07" >
<Button
android:id="@+id/getScheduleButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:onClick="getScheduleClicked"
android:text="@string/get_schedule" />
<Button
android:id="@+id/compareWithFriends"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/getScheduleButton"
android:layout_alignParentRight="true"
android:layout_toRightOf="@+id/getScheduleButton"
android:onClick="compareWithFriendsClicked"
android:text="@string/compare_with_a_friend" />
</RelativeLayout>
</LinearLayout>
而且我想我应该简单地提一下，Schedule 包含 Day 对象，其中包含要显示的课程列表。所有这些代码都绝对有效，我已经使用了几个月。