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我使用的是ViewPager与FragmentPagerAdapter。每个页面都是同一个Fragment类的一个实例，我总是使用固定数量的7个页面（从今天开始的一周中的几天）。调试显示所有碎片都已创建并在创建时拥有正确的数据。有趣的是，虽然该适配器在0，1，2 ... 6，片段的onCreateView被调用的顺序6,0，1,2，... 5条为了创造片段。的Android ViewPager与FragmentPageAdapter - 只有最后一个片段页面可见
当运行应用程序和打开这个活动，第一个片段页是空白，然后我可以通过标签上滑行并看到所有的页面都是除了最后一个空白。但是，最后一页没有显示来自最后一天的数据，它显示的是一天之前的数据，是倒数第二组数据。
我复制另一个ViewPager/FragmentPagerAdapter，我有这样的作品，虽然是一个只有3页，使用不同片段的每一页。
我没有看到什么我做错了，我一直在寻找了一整天，还没有找到答案。在这里很多类似的问题通过使用FragmentStatePagerAdapter而不是FragmentPagerAdapter来解决。我已经尝试过，它的行为与目前完全相同。
这是活动主办ViewPager：
public class ForecastFaveRowClickedActivity extends AppCompatActivity {
String distName = "";
public List<ForecastEntry> forecastEntries = new ArrayList<>();
ForecastPagerAdapter adapterViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_forecast_detail);
// get the districts from the main activity
Bundle bundle = getIntent().getExtras();
distName = bundle.getString("districtName");
if (bundle.containsKey("forecastData")) {
forecastEntries = bundle.getParcelableArrayList("forecastData");
}
Collections.sort(forecastEntries);
// set up viewpager and display the first tab
// ViewPager for tabs
ViewPager viewPager = (ViewPager) findViewById(R.id.forecast_pager);
adapterViewPager = new ForecastPagerAdapter(getSupportFragmentManager(), ForecastFaveRowClickedActivity.this);
viewPager.setOffscreenPageLimit(7);
// set the tab titles based on the forecast list for this district
String[] days = new String[7];
int count = 0;
for (ForecastEntry forecastEntry : forecastEntries) {
days[count] = forecastEntry.forecastDay.substring(0,3);
count++;
}
adapterViewPager.setTabTitles(days);
viewPager.setAdapter(adapterViewPager);
//viewPager.setCurrentItem(0); // set to today's tab to start with
// give the tab layout to the viewpager
TabLayout tabLayout = (TabLayout) findViewById(R.id.forecast_sliding_date_tabs);
tabLayout.setupWithViewPager(viewPager);
}
// class for view pager adapter
public class ForecastPagerAdapter extends FragmentPagerAdapter {
private int NUM_ITEMS = 7;
private String tabTitles[] = new String[7];
private Context context;
public ForecastPagerAdapter(FragmentManager fm) {
super(fm);
}
public ForecastPagerAdapter(FragmentManager fragmentManager, Context context) {
super(fragmentManager);
this.context = context;
}
// returns total # of pages
@Override
public int getCount() {
return NUM_ITEMS;
}
// returns the fragment to display for that page
@Override
public Fragment getItem(int position) {
Fragment frag = new Fragment();
ForecastEntry forecastEntry;
Log.v("Fragment.getItem", Integer.toString(position));
forecastEntry = ((ForecastFaveRowClickedActivity)context).forecastEntries.get(position);
frag = FragmentForecastDay.newInstance(position, forecastEntry);
return frag;
}
// returns the page title for the top indicator
@Override
public CharSequence getPageTitle(int position) {
return tabTitles[position];
}
public void setTabTitles(String[] days) {
tabTitles = Arrays.copyOf(days, days.length);
}
}
}
这是该活动的布局：
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="com.districtoverview.ForecastFaveRowClickedActivity">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:titleTextColor="@color/colorWhite"
android:elevation="4dp"
android:theme="@style/AppTheme.AppBarOverlay"
app:popupTheme="@style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="6dp"
android:paddingTop="6dp"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.districtoverview.ForecastFaveRowClickedActivity"
tools:showIn="@layout/activity_forecast_detail"
android:orientation="vertical">
<android.support.design.widget.TabLayout
android:id="@+id/forecast_sliding_date_tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:paddingBottom="2dp"
android:paddingTop="2dp"
app:tabMode="scrollable"
app:tabGravity="fill"
style="@style/customForecastTabLayout" />
<android.support.v4.view.ViewPager
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/forecast_pager"
android:layout_width="match_parent"
android:layout_height="0px"
android:layout_weight="1"
android:background="@android:color/white"
tools:context="com.districtoverview.ForecastFaveRowClickedActivity">
</android.support.v4.view.ViewPager>
</LinearLayout>
</android.support.design.widget.CoordinatorLayout>
这是片段类的代码。
public class FragmentForecastDay extends Fragment {
String label;
int page;
ForecastEntry forecastEntry;
public static FragmentForecastDay newInstance(int page, ForecastEntry forecastEntry) {
FragmentForecastDay fragment = new FragmentForecastDay();
Bundle args = new Bundle();
args.putParcelable("forecastEntry", forecastEntry);
args.putInt("page", page);
fragment.setArguments(args);
return fragment;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_forecast_day, container, false);
page = getArguments().getInt("page", 0);
forecastEntry = getArguments().getParcelable("forecastEntry");
return view;
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
TextView headerDistNameTV = (TextView) getActivity().findViewById(R.id.dist_name_header_text);
headerDistNameTV.setText(parentActivity.distName);
TextView headerForecastDateTV = (TextView) getActivity().findViewById(R.id.forecast_date_header_text);
headerForecastDateTV.setText(forecastEntry.forecastDate);
TextView headerTotalTechsTV = (TextView) getActivity().findViewById(R.id.total_techs_header_text); headerTotalTechsTV.setText(Double.toString(forecastEntry.totalTechs));
TextView headerDayShiftTV = (TextView) getActivity().findViewById(R.id.day_shift_header_text);
headerDayShiftTV.setText("Day Shift");
TextView dayExpectedTechsTV = (TextView) getActivity().findViewById(R.id.day_shift_expected_text);
String dayExpectedTechs = "Expected " + Double.toString(forecastEntry.expectedTechs);
dayExpectedTechsTV.setText(dayExpectedTechs);
TextView headerAfterHoursTV = (TextView) getActivity().findViewById(R.id.after_hours_header_text);
headerAfterHoursTV.setText("After Hours");
TextView afterHoursExpectedTechsTV = (TextView) getActivity().findViewById(R.id.day_shift_expected_text);
String afterHoursExpectedTechs = "Expected " + Double.toString(forecastEntry.afterHoursExpected);
afterHoursExpectedTechsTV.setText(afterHoursExpectedTechs);
}
}
这是片段的布局：
<?xml version="1.0" encoding="utf-8"?>
<TableLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/forecast_day_table_layout"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="0.90"
android:paddingTop="4dp"
android:paddingBottom="4dp"
android:paddingLeft="4dp"
android:paddingRight="4dp"
android:weightSum="1">
<TableRow
android:id="@+id/row_dist_name_header"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.50">
<TextView
android:id="@+id/dist_name_header_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#000"
android:textAppearance="?android:attr/textAppearanceLarge"
android:paddingBottom="5dp" />
</TableRow>
<TableRow
android:id="@+id/row_date_header"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.50">
<TextView
android:id="@+id/forecast_date_header_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#000"
android:textAppearance="?android:attr/textAppearanceLarge"
android:paddingBottom="5dp" />
</TableRow>
<TableRow
android:id="@+id/row_total_techs_header"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.50">
<TextView
android:id="@+id/total_techs_header_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#000"
android:textAppearance="?android:attr/textAppearanceLarge"
android:paddingBottom="5dp" />
</TableRow>
<TableRow
android:id="@+id/row_total_techs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.50">
<TextView
android:id="@+id/total_techs_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#000"
android:textAppearance="?android:attr/textAppearanceLarge"
android:paddingBottom="5dp" />
</TableRow>
<TableRow
android:id="@+id/row_day_shift_header"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.50">
<TextView
android:id="@+id/day_shift_header_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#000"
android:textAppearance="?android:attr/textAppearanceLarge"
android:paddingBottom="5dp" />
</TableRow>
<TableRow
android:id="@+id/row_day_shift_expected"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.50">
<TextView
android:id="@+id/day_shift_expected_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#000"
android:textAppearance="?android:attr/textAppearanceLarge"
android:paddingBottom="5dp" />
</TableRow>
<TableRow
android:id="@+id/row_after_hours_header"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.50">
<TextView
android:id="@+id/after_hours_header_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#000"
android:textAppearance="?android:attr/textAppearanceLarge"
android:paddingBottom="5dp" />
</TableRow>
<TableRow
android:id="@+id/row_after_hours_expected"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.50">
<TextView
android:id="@+id/after_hours_expected_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#000"
android:textAppearance="?android:attr/textAppearanceLarge"
android:paddingBottom="5dp" />
</TableRow>
</TableLayout>
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