我找到了关于主细节片段的android代码，我也将其转换为使用标签。当我在手机或桌面上以portait方向运行代码时应用程序正常工作但当我将方向更改为横向时，应用程序不会更改。代码如下：
// This code has some modifications to the original
// See http://developer.android.com/guide/components/fragments.html
// for a detailed discussion on the app
// I don't recommend toast as debug for flow but why not do that to get started.
// Better to use Log.d() which we introduced before. Toast is fleeting and logs
// will always in in the LogCat -- hence they are more useful and better practice;
// but you can't see them on the phone. It is sort cool to see onCreate() toast
// as you flip the phone's orientation. It reinforces the lifecycle and the
// automatic adjustment of the UI.
//
// ATC 2013
package edu.dartmouth.cs;
import java.util.ArrayList;
import java.util.List;
import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.ActionBar.TabListener;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.app.ListFragment;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.content.res.Configuration;
import android.os.Bundle;
import android.util.Log;
import android.util.TypedValue;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.ScrollView;
import android.util.Log;
import android.util.TypedValue;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.ScrollView;
import android.widget.TextView;
import android.widget.Toast;
import edu.dartmouth.cs.FragmentLayout.Titles2Fragment;
import edu.dartmouth.cs.FragmentLayout.TitlesFragment;
import edu.dartmouth.cs.apis.CopyOfShakespeare;
import edu.dartmouth.cs.apis.Shakespeare;`
// Demonstration of using fragments to implement different activity layouts.
// This sample provides a different layout (and activity flow) when run in
// landscape.
`public class FragmentLayout extends Activity {
//List<Fragment> fragList = new ArrayList<Fragment>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//tab
final ActionBar actionBar = getActionBar();
// Specify that tabs should be displayed in the action bar.
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// Add 2 tabs, specifying the tab's text and TabListener
Tab meinProfil = actionBar.newTab().setText("Mein Profil");
TabListener<TitlesFragment> tabListenerMeinProfil = new TabListener<TitlesFragment>(this,"Mein Profil",TitlesFragment.class);
meinProfil.setTabListener(tabListenerMeinProfil);
actionBar.addTab(meinProfil);
Tab mitglieder = actionBar.newTab().setText("Mitglieder");
TabListener<Titles2Fragment> tabListenerMitglieder = new TabListener<Titles2Fragment>(this,"Mitglieder",Titles2Fragment.class);
mitglieder.setTabListener(tabListenerMitglieder);
actionBar.addTab(mitglieder);
//
Toast.makeText(this, "FragmentLayout: OnCreate()", Toast.LENGTH_SHORT)
.show();
// Sets the view. Depending on orientation it will select either
// res/layout/fragment_layout.xml (portrait mode) or
// res/layout-land/fragment_layout.xml (landscape mode). This is done
// automatically by the system.
if (savedInstanceState != null) {
actionBar.setSelectedNavigationItem(savedInstanceState.getInt("tab", 0));
}
//setContentView(R.layout.fragment_layout);
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt("tab", getActionBar().getSelectedNavigationIndex());
}
private class TabListener<T extends Fragment> implements
ActionBar.TabListener {
private Fragment mFragment;
private final Activity mActivity;
private final String mTag;
private final Class<T> mClass;
private final Bundle mArgs;
public TabListener(Activity activity, String tag, Class<T> clz) {
this(activity, tag, clz, null);
}
/**
* Constructor used each time a new tab is created.
*
* @param activity
* The host Activity, used to instantiate the fragment
* @param tag
* The identifier tag for the fragment
* @param clz
* The fragment's Class, used to instantiate the fragment
*/
public TabListener(Activity activity, String tag, Class<T> clz, Bundle args) {
mActivity = activity;
mTag = tag;
mClass = clz;
mArgs = args;
// Check to see if we already have a fragment for this tab, probably
// from a previously saved state. If so, deactivate it, because our
// initial state is that a tab isn't shown.
Log.d("pas 111", mTag.toString());
mFragment = mActivity.getFragmentManager().findFragmentByTag(mTag);
if (mFragment != null && !mFragment.isDetached()) {
Log.d("pas", mTag.toString());
FragmentTransaction ft = mActivity.getFragmentManager().beginTransaction();
ft.detach(mFragment);
ft.commit();
}
}
public void onTabSelected(Tab tab, FragmentTransaction ft) {
Log.d("pas 111", mTag.toString());
// mFragment = mActivity.getFragmentManager().findFragmentByTag(mTag);
if (mFragment == null) {
mFragment = Fragment.instantiate(mActivity, mClass.getName(), mArgs);
ft.add(android.R.id.content, mFragment, mTag);
} else {
ft.attach(mFragment);
}
}
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
// mFragment = mActivity.getFragmentManager().findFragmentByTag(mTag);
if (mFragment != null) {
Log.d("pas unselected", mTag.toString());
ft.detach(mFragment);
//ft.commit();
}
}
public void onTabReselected(Tab tab, FragmentTransaction ft) {
// User selected the already selected tab. Usually do nothing.
Toast.makeText(mActivity, "Reselected!", Toast.LENGTH_SHORT).show();
}
}
// This is a secondary activity, to show what the user has selected when the
// screen is not large enough to show it all in one activity.
public static class DetailsActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Toast.makeText(this, "DetailsActivity", Toast.LENGTH_SHORT).show();
if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) {
// If the screen is now in landscape mode, we can show the
// dialog in-line with the list so we don't need this activity.
finish();
return;
}
if (savedInstanceState == null) {
// During initial setup, plug in the details fragment.
// create fragment
DetailsFragment details = new DetailsFragment();
// get and set the position input by user (i.e., "index")
// which is the construction arguments for this fragment
details.setArguments(getIntent().getExtras());
//
getFragmentManager().beginTransaction()
.add(android.R.id.content, details).commit();
}
}
}
// This is the "top-level" fragment, showing a list of items that the user
// can pick. Upon picking an item, it takes care of displaying the data to
// the user as appropriate based on the current UI layout.
// Displays a list of items that are managed by an adapter similar to
// ListActivity. It provides several methods for managing a list view, such
// as the onListItemClick() callback to handle click events.
public static class TitlesFragment extends ListFragment {
boolean mDualPane;
int mCurCheckPosition = 0;
// onActivityCreated() is called when the activity's onCreate() method
// has returned.
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
getActivity().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_FULL_SENSOR);
// You can use getActivity(), which returns the activity associated
// with a fragment.
// The activity is a context (since Activity extends Context) .
Toast.makeText(getActivity(), "TitlesFragment:onActivityCreated",
Toast.LENGTH_LONG).show();
// Populate list with our static array of titles in list in the
// Shakespeare class
setListAdapter(new ArrayAdapter<String>(getActivity(),
android.R.layout.simple_list_item_activated_1,
Shakespeare.TITLES));
// Check to see if we have a frame in which to embed the details
// fragment directly in the containing UI.
// R.id.details relates to the res/layout-land/fragment_layout.xml
// This is first created when the phone is switched to landscape
// mode
View detailsFrame = getActivity().findViewById(R.id.details);
Toast.makeText(getActivity(), "detailsFrame " + detailsFrame,
Toast.LENGTH_LONG).show();
// Check that a view exists and is visible
// A view is visible (0) on the screen; the default value.
// It can also be invisible and hidden, as if the view had not been
// added.
//
mDualPane = detailsFrame != null
&& detailsFrame.getVisibility() == View.VISIBLE;
//mDualPane=true;
Toast.makeText(getActivity(), "mDualPane " + mDualPane,
Toast.LENGTH_LONG).show();
if (savedInstanceState != null) {
// Restore last state for checked position.
mCurCheckPosition = savedInstanceState.getInt("curChoice", 0);
}
if (mDualPane) {
// In dual-pane mode, the list view highlights the selected
// item.
getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE);
// Make sure our UI is in the correct state.
showDetails(mCurCheckPosition);
} else {
// We also highlight in uni-pane just for fun
getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE);
getListView().setItemChecked(mCurCheckPosition, true);
}
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
Toast.makeText(getActivity(), "onSaveInstanceState",
Toast.LENGTH_LONG).show();
outState.putInt("curChoice", mCurCheckPosition);
}
// If the user clicks on an item in the list (e.g., Henry V then the
// onListItemClick() method is called. It calls a helper function in
// this case.
@Override
public void onListItemClick(ListView l, View v, int position, long id) {
Toast.makeText(getActivity(),
"onListItemClick position is" + position, Toast.LENGTH_LONG)
.show();
showDetails(position);
}
// Helper function to show the details of a selected item, either by
// displaying a fragment in-place in the current UI, or starting a whole
// new activity in which it is displayed.
void showDetails(int index) {
mCurCheckPosition = index;
// The basic design is mutli-pane (landscape on the phone) allows us
// to display both fragments (titles and details) with in the same
// activity; that is FragmentLayout -- one activity with two
// fragments.
// Else, it's single-pane (portrait on the phone) and we fire
// another activity to render the details fragment - two activities
// each with its own fragment .
//
if (mDualPane) {
// We can display everything in-place with fragments, so update
// the list to highlight the selected item and show the data.
// We keep highlighted the current selection
getListView().setItemChecked(index, true);
// Check what fragment is currently shown, replace if needed.
DetailsFragment details = (DetailsFragment) getFragmentManager()
.findFragmentById(R.id.details);
if (details == null || details.getShownIndex() != index) {
// Make new fragment to show this selection.
details = DetailsFragment.newInstance(index);
Toast.makeText(getActivity(),
"showDetails dual-pane: create and relplace fragment",
Toast.LENGTH_LONG).show();
// Execute a transaction, replacing any existing fragment
// with this one inside the frame.
FragmentTransaction ft = getFragmentManager()
.beginTransaction();
ft.replace(R.id.details, details);
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
ft.commit();
}
} else {
// Otherwise we need to launch a new activity to display
// the dialog fragment with selected text.
// That is: if this is a single-pane (e.g., portrait mode on a
// phone) then fire DetailsActivity to display the details
// fragment
// Create an intent for starting the DetailsActivity
Intent intent = new Intent();
// explicitly set the activity context and class
// associated with the intent (context, class)
intent.setClass(getActivity(), DetailsActivity.class);
// pass the current position
intent.putExtra("index", index);
startActivity(intent);
}
}
}
// This is the secondary fragment, displaying the details of a particular
// item.
public static class DetailsFragment extends Fragment {
// Create a new instance of DetailsFragment, initialized to show the
// text at 'index'.
public static DetailsFragment newInstance(int index) {
DetailsFragment f = new DetailsFragment();
// Supply index input as an argument.
Bundle args = new Bundle();
args.putInt("index", index);
f.setArguments(args);
return f;
}
public int getShownIndex() {
return getArguments().getInt("index", 0);
}
// The system calls this when it's time for the fragment to draw its
// user interface for the first time. To draw a UI for your fragment,
// you must return a View from this method that is the root of your
// fragment's layout. You can return null if the fragment does not
// provide a UI.
// We create the UI with a scrollview and text and return a reference to
// the scoller which is then drawn to the screen
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
getActivity().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_FULL_SENSOR);
Toast.makeText(getActivity(), "DetailsFragment:onCreateView",
Toast.LENGTH_LONG).show();
//
// if (container == null) {
// // We have different layouts, and in one of them this
// // fragment's containing frame doesn't exist. The fragment
// // may still be created from its saved state, but there is
// // no reason to try to create its view hierarchy because it
// // won't be displayed. Note this is not needed -- we could
// // just run the code below, where we would create and return
// // the view hierarchy; it would just never be used.
// return null;
// }
// If non-null, this is the parent view that the fragment's UI
// should be attached to. The fragment should not add the view
// itself, but this can be used to generate the LayoutParams of
// the view.
//
// programmatically create a scrollview and texview for the text in
// the container/fragment layout. Set up the properties and add the
// view.
ScrollView scroller = new ScrollView(getActivity());
TextView text = new TextView(getActivity());
int padding = (int) TypedValue.applyDimension(
TypedValue.COMPLEX_UNIT_DIP, 4, getActivity()
.getResources().getDisplayMetrics());
text.setPadding(padding, padding, padding, padding);
scroller.addView(text);
text.setText(Shakespeare.DIALOGUE[getShownIndex()]);
return scroller;
}
}
public static class Titles2Fragment extends ListFragment {
boolean mDualPane;
int mCurCheckPosition = 0;
// onActivityCreated() is called when the activity's onCreate() method
// has returned.
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
getActivity().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_FULL_SENSOR);
// You can use getActivity(), which returns the activity associated
// with a fragment.
// The activity is a context (since Activity extends Context) .
Toast.makeText(getActivity(), "Titles2Fragment:onActivityCreated",
Toast.LENGTH_LONG).show();
// Populate list with our static array of titles in list in the
// Shakespeare class
setListAdapter(new ArrayAdapter<String>(getActivity(),
android.R.layout.simple_list_item_activated_1,
CopyOfShakespeare.TITLES2));
// Check to see if we have a frame in which to embed the details
// fragment directly in the containing UI.
// R.id.details relates to the res/layout-land/fragment_layout.xml
// This is first created when the phone is switched to landscape
// mode
View detailsFrame = getActivity().findViewById(R.id.details);
Toast.makeText(getActivity(), "detailsFrame " + detailsFrame,
Toast.LENGTH_LONG).show();
// Check that a view exists and is visible
// A view is visible (0) on the screen; the default value.
// It can also be invisible and hidden, as if the view had not been
// added.
//
mDualPane = detailsFrame != null
&& detailsFrame.getVisibility() == View.VISIBLE;
//mDualPane=true;
Toast.makeText(getActivity(), "mDualPane " + mDualPane,
Toast.LENGTH_LONG).show();
if (savedInstanceState != null) {
// Restore last state for checked position.
mCurCheckPosition = savedInstanceState.getInt("curChoice", 0);
}
if (mDualPane) {
// In dual-pane mode, the list view highlights the selected
// item.
getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE);
// Make sure our UI is in the correct state.
showDetails(mCurCheckPosition);
} else {
// We also highlight in uni-pane just for fun
getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE);
getListView().setItemChecked(mCurCheckPosition, true);
}
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
Toast.makeText(getActivity(), "onSaveInstanceState",
Toast.LENGTH_LONG).show();
outState.putInt("curChoice", mCurCheckPosition);
}
// If the user clicks on an item in the list (e.g., Henry V then the
// onListItemClick() method is called. It calls a helper function in
// this case.
@Override
public void onListItemClick(ListView l, View v, int position, long id) {
Toast.makeText(getActivity(),
"onListItemClick position is" + position, Toast.LENGTH_LONG)
.show();
showDetails(position);
}
// Helper function to show the details of a selected item, either by
// displaying a fragment in-place in the current UI, or starting a whole
// new activity in which it is displayed.
void showDetails(int index) {
mCurCheckPosition = index;
// The basic design is mutli-pane (landscape on the phone) allows us
// to display both fragments (titles and details) with in the same
// activity; that is FragmentLayout -- one activity with two
// fragments.
// Else, it's single-pane (portrait on the phone) and we fire
// another activity to render the details fragment - two activities
// each with its own fragment .
//
if (mDualPane) {
// We can display everything in-place with fragments, so update
// the list to highlight the selected item and show the data.
// We keep highlighted the current selection
getListView().setItemChecked(index, true);
// Check what fragment is currently shown, replace if needed.
Details2Fragment details = (Details2Fragment) getFragmentManager()
.findFragmentById(R.id.details);
if (details == null || details.getShownIndex() != index) {
// Make new fragment to show this selection.
details = Details2Fragment.newInstance(index);
Toast.makeText(getActivity(),
"showDetails dual-pane: create and relplace fragment",
Toast.LENGTH_LONG).show();
// Execute a transaction, replacing any existing fragment
// with this one inside the frame.
FragmentTransaction ft = getFragmentManager()
.beginTransaction();
ft.replace(R.id.details, details);
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
ft.commit();
}
} else {
// Otherwise we need to launch a new activity to display
// the dialog fragment with selected text.
// That is: if this is a single-pane (e.g., portrait mode on a
// phone) then fire DetailsActivity to display the details
// fragment
// Create an intent for starting the DetailsActivity
Intent intent = new Intent();
// explicitly set the activity context and class
// associated with the intent (context, class)
intent.setClass(getActivity(), Details2Activity.class);
// pass the current position
intent.putExtra("index", index);
startActivity(intent);
}
}
}
public static class Details2Activity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Toast.makeText(this, "Details2Activity", Toast.LENGTH_SHORT).show();
if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) {
// If the screen is now in landscape mode, we can show the
// dialog in-line with the list so we don't need this activity.
finish();
return;
}
if (savedInstanceState == null) {
// During initial setup, plug in the details fragment.
// create fragment
Details2Fragment details = new Details2Fragment();
// get and set the position input by user (i.e., "index")
// which is the construction arguments for this fragment
details.setArguments(getIntent().getExtras());
//
getFragmentManager().beginTransaction()
.add(android.R.id.content, details).commit();
}
}
}
public static class Details2Fragment extends Fragment {
// Create a new instance of DetailsFragment, initialized to show the
// text at 'index'.
public static Details2Fragment newInstance(int index) {
Details2Fragment f = new Details2Fragment();
// Supply index input as an argument.
Bundle args = new Bundle();
args.putInt("index", index);
f.setArguments(args);
return f;
}
public int getShownIndex() {
return getArguments().getInt("index", 0);
}
// The system calls this when it's time for the fragment to draw its
// user interface for the first time. To draw a UI for your fragment,
// you must return a View from this method that is the root of your
// fragment's layout. You can return null if the fragment does not
// provide a UI.
// We create the UI with a scrollview and text and return a reference to
// the scoller which is then drawn to the screen
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
getActivity().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_FULL_SENSOR);
Toast.makeText(getActivity(), "Details2Fragment:onCreateView",
Toast.LENGTH_LONG).show();
//
// if (container == null) {
// // We have different layouts, and in one of them this
// // fragment's containing frame doesn't exist. The fragment
// // may still be created from its saved state, but there is
// // no reason to try to create its view hierarchy because it
// // won't be displayed. Note this is not needed -- we could
// // just run the code below, where we would create and return
// // the view hierarchy; it would just never be used.
// return null;
// }
// If non-null, this is the parent view that the fragment's UI
// should be attached to. The fragment should not add the view
// itself, but this can be used to generate the LayoutParams of
// the view.
//
// programmatically create a scrollview and texview for the text in
// the container/fragment layout. Set up the properties and add the
// view.
ScrollView scroller = new ScrollView(getActivity());
TextView text = new TextView(getActivity());
int padding = (int) TypedValue.applyDimension(
TypedValue.COMPLEX_UNIT_DIP, 4, getActivity()
.getResources().getDisplayMetrics());
text.setPadding(padding, padding, padding, padding);
scroller.addView(text);
text.setText(CopyOfShakespeare.DIALOGUE2[getShownIndex()]);
return scroller;
}
}
}`
我的清单文件：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="edu.dartmouth.cs"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="15"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_fragments"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="edu.dartmouth.cs.FragmentLayout"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name="edu.dartmouth.cs.FragmentLayout$DetailsActivity" />
<activity android:name="edu.dartmouth.cs.FragmentLayout$Details2Activity" />
</application>
知道它为什么不起作用？ 还有一个问题。这种设计（带有主要细节片段的标签）是显示“主”表和“细节”表记录的正确方法吗？我的意思是，如果因为性能而有任何不利之处。 建议被接受 谢谢你的帮助