Fragmentize VpnSettings and relevant Activities.

Add startFragment() to SettingsFragmentPreference.

Change-Id: Ifab93b2e68892d5f6da559f337c94d62629780c8

AndroidManifest.xml

@@ -197,10 +197,10 @@
             </intent-filter>
         </activity-alias>
 
-        <activity android:name=".vpn.VpnSettings"
+        <activity-alias android:name=".vpn.VpnSettings"
-                android:label="@string/vpn_settings_title"
                 android:configChanges="orientation|keyboardHidden"
-                android:clearTaskOnLaunch="true">
+                android:clearTaskOnLaunch="true"
+                android:targetActivity="Settings">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
                 <action android:name="android.net.vpn.SETTINGS" />
@@ -208,14 +208,7 @@
                 <category android:name="android.intent.category.VOICE_LAUNCH" />
                 <category android:name="com.android.settings.SHORTCUT" />
             </intent-filter>
-        </activity>
+        </activity-alias>
-
-        <activity android:name=".vpn.VpnTypeSelection"
-                android:configChanges="orientation|keyboardHidden">
-        </activity>
-        <activity android:name=".vpn.VpnEditor"
-                android:configChanges="orientation|keyboardHidden">
-        </activity>
 
         <activity-alias android:name="DateTimeSettings"
                 android:label="@string/date_and_time"

res/xml/wireless_settings.xml

@@ -59,13 +59,10 @@
     </PreferenceScreen>
 
     <PreferenceScreen
+        android:fragment="com.android.settings.vpn.VpnSettings"
         android:key="vpn_settings"
         android:title="@string/vpn_settings_title"
         android:summary="@string/vpn_settings_summary" >
-        <intent
-            android:action="android.intent.action.MAIN"
-            android:targetPackage="com.android.settings"
-            android:targetClass="com.android.settings.vpn.VpnSettings" />
     </PreferenceScreen>
 
     <PreferenceScreen

src/com/android/settings/Settings.java

@@ -41,7 +41,8 @@ import java.util.ArrayList;
  */
 public class Settings extends Activity
         implements PreferenceFragment.OnPreferenceStartFragmentCallback,
-        SettingsPreferenceFragment.OnStateListener {
+        SettingsPreferenceFragment.OnStateListener,
+        SettingsPreferenceFragment.FragmentStarter {
 
     private static final boolean DBG = false;
 
@@ -143,7 +144,9 @@ public class Settings extends Activity
         if (DBG) Log.d(TAG, "showFragment");
        Fragment f = Fragment.instantiate(this, fragmentClass, extras);
         if (f instanceof SettingsPreferenceFragment) {
-            ((SettingsPreferenceFragment) f).setOnStateListener(this);
+            SettingsPreferenceFragment spf = (SettingsPreferenceFragment) f;
+            spf.setOnStateListener(this);
+            spf.setFragmentStarter(this);
         }
         mBreadCrumbs.clear();
         getFragmentManager().popBackStack(BACK_STACK_PREFS, POP_BACK_STACK_INCLUSIVE);
@@ -176,9 +179,17 @@ public class Settings extends Activity
 
     public boolean onPreferenceStartFragment(PreferenceFragment caller, Preference pref) {
         if (DBG) Log.d(TAG, "onPreferenceStartFragment");
-        Fragment f = Fragment.instantiate(this, pref.getFragment(), pref.getExtras());
+        return startFragment(caller, pref.getFragment(), -1, pref.getExtras());
+    }
+
+    public boolean startFragment(
+            Fragment caller, String fragmentClass, int requestCode, Bundle extras) {
+        Fragment f = Fragment.instantiate(this, fragmentClass, extras);
+        caller.setTargetFragment(f, requestCode);
         if (f instanceof SettingsPreferenceFragment) {
-            ((SettingsPreferenceFragment) f).setOnStateListener(this);
+            SettingsPreferenceFragment spf = (SettingsPreferenceFragment) f;
+            spf.setOnStateListener(this);
+            spf.setFragmentStarter(this);
         }
         getFragmentManager().openTransaction().replace(R.id.prefs, f)
                 .addToBackStack(BACK_STACK_PREFS).commit();

src/com/android/settings/SettingsPreferenceFragment.java

@@ -19,6 +19,7 @@ package com.android.settings;
 import android.app.Activity;
 import android.app.Dialog;
 import android.app.DialogFragment;
+import android.app.Fragment;
 import android.content.ContentResolver;
 import android.content.Intent;
 import android.content.pm.PackageManager;
@@ -58,6 +59,10 @@ public class SettingsPreferenceFragment extends PreferenceFragment
     private SettingsDialogFragment mDialogFragment;
 
     private OnStateListener mOnStateListener;
+    private FragmentStarter mFragmentStarter;
+
+    private int mResultCode = Activity.RESULT_CANCELED;
+    private Intent mResultData;
 
     private Button mNextButton;
 
@@ -74,6 +79,43 @@ public class SettingsPreferenceFragment extends PreferenceFragment
         mOnStateListener = listener;
     }
 
+    /**
+     * Letting the class, assumed to be Fragment, start another Fragment object.
+     * The target Fragment object is stored in the caller Fragment using
+     * {@link Fragment#setTargetFragment(Fragment, int)}. The caller
+     * is able to obtain result code and result data via
+     * {@link SettingsPreferenceFragment#getResultCode()} and
+     * {@link SettingsPreferenceFragment#getResultData()} accordingly.
+     */
+    interface FragmentStarter {
+        public boolean startFragment(
+                Fragment caller, String fragmentClass, int requestCode, Bundle extras);
+    }
+
+    public void setFragmentStarter(FragmentStarter starter) {
+        mFragmentStarter = starter;
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+
+        final Fragment f = getTargetFragment();
+        final int requestCode = getTargetRequestCode();
+
+        // TargetFragment becomes invalid when this object is resumed. Notify it to
+        // FragmentManager. Without this code, FragmentManager wrongly take the TargetFragment
+        // as live, and throws IllegalStateException.
+        setTargetFragment(null, -1);
+
+        if (f != null && (f instanceof SettingsPreferenceFragment)) {
+            final SettingsPreferenceFragment spf = (SettingsPreferenceFragment)f;
+            final int resultCode = spf.getResultCode();
+            final Intent resultData = spf.getResultData();
+            onActivityResult(requestCode, resultCode, resultData);
+        }
+    }
+
     @Override
     public void onActivityCreated(Bundle savedInstanceState) {
         super.onActivityCreated(savedInstanceState);
@@ -86,6 +128,32 @@ public class SettingsPreferenceFragment extends PreferenceFragment
         setupButtonBar();
     }
 
+    public final void setResult(int resultCode) {
+        mResultCode = resultCode;
+        mResultData = null;
+    }
+
+    public final void setResult(int resultCode, Intent data) {
+        mResultCode = resultCode;
+        mResultData = data;
+    }
+
+    public final int getResultCode() {
+        return mResultCode;
+    }
+
+    public final Intent getResultData() {
+        return mResultData;
+    }
+
+    /*
+     * The name is intentionally made different from Activity#finish(), so that
+     * users won't misunderstand its meaning.
+     */
+    public final void finishFragment() {
+        getActivity().onBackPressed();
+    }
+
     @Override
     public void onDestroy() {
         super.onDestroy();
@@ -179,6 +247,16 @@ public class SettingsPreferenceFragment extends PreferenceFragment
         getActivity().onBackPressed();
     }
 
+    public boolean startFragment(
+            Fragment caller, String fragmentClass, int requestCode, Bundle extras) {
+        if (mFragmentStarter != null) {
+            return mFragmentStarter.startFragment(caller, fragmentClass, requestCode, extras);
+        } else {
+            Log.w(TAG, "FragmentStarter is not set.");
+            return false;
+        }
+    }
+
     /**
      * Sets up Button Bar possibly required in the Fragment. Probably available only in
      * phones.

src/com/android/settings/vpn/VpnEditor.java

@@ -17,7 +17,9 @@
 package com.android.settings.vpn;
 
 import com.android.settings.R;
+import com.android.settings.SettingsPreferenceFragment;
 
+import android.app.Activity;
 import android.app.AlertDialog;
 import android.app.Dialog;
 import android.content.DialogInterface;
@@ -27,22 +29,19 @@ import android.net.vpn.L2tpIpsecPskProfile;
 import android.net.vpn.L2tpProfile;
 import android.net.vpn.PptpProfile;
 import android.net.vpn.VpnProfile;
-import android.net.vpn.VpnType;
 import android.os.Bundle;
 import android.os.Parcel;
 import android.os.Parcelable;
-import android.preference.PreferenceActivity;
-import android.preference.PreferenceGroup;
 import android.text.TextUtils;
-import android.view.KeyEvent;
+import android.util.Log;
 import android.view.Menu;
+import android.view.MenuInflater;
 import android.view.MenuItem;
-import android.view.View;
 
 /**
  * The activity class for editing a new or existing VPN profile.
  */
-public class VpnEditor extends PreferenceActivity {
+public class VpnEditor extends SettingsPreferenceFragment {
     private static final int MENU_SAVE = Menu.FIRST;
     private static final int MENU_CANCEL = Menu.FIRST + 1;
     private static final int CONFIRM_DIALOG_ID = 0;
@@ -56,59 +55,75 @@ public class VpnEditor extends PreferenceActivity {
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        VpnProfile p = (VpnProfile) ((savedInstanceState == null)
-                ? getIntent().getParcelableExtra(VpnSettings.KEY_VPN_PROFILE)
-                : savedInstanceState.getParcelable(KEY_PROFILE));
-        mProfileEditor = getEditor(p);
-        mAddingProfile = TextUtils.isEmpty(p.getName());
 
         // Loads the XML preferences file
         addPreferencesFromResource(R.xml.vpn_edit);
+    }
+
+    @Override
+    public void onActivityCreated(Bundle savedInstanceState) {
+        super.onActivityCreated(savedInstanceState);
+
+        VpnProfile p;
+        if (savedInstanceState != null) {
+            p = (VpnProfile)savedInstanceState.getParcelable(KEY_PROFILE);
+        } else {
+            p = (VpnProfile)getArguments().getParcelable(VpnSettings.KEY_VPN_PROFILE);
+            if (p == null) {
+                p = getActivity().getIntent().getParcelableExtra(VpnSettings.KEY_VPN_PROFILE);
+            }
+        }
+
+        mProfileEditor = getEditor(p);
+        mAddingProfile = TextUtils.isEmpty(p.getName());
 
         initViewFor(p);
 
         Parcel parcel = Parcel.obtain();
         p.writeToParcel(parcel, 0);
         mOriginalProfileData = parcel.marshall();
+
+        registerForContextMenu(getListView());
+        setHasOptionsMenu(true);
     }
 
     @Override
-    protected synchronized void onSaveInstanceState(Bundle outState) {
+    public synchronized void onSaveInstanceState(Bundle outState) {
         if (mProfileEditor == null) return;
 
         outState.putParcelable(KEY_PROFILE, getProfile());
     }
 
     @Override
-    public boolean onCreateOptionsMenu(Menu menu) {
+    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
-        super.onCreateOptionsMenu(menu);
+        super.onCreateOptionsMenu(menu, inflater);
         menu.add(0, MENU_SAVE, 0, R.string.vpn_menu_done)
             .setIcon(android.R.drawable.ic_menu_save);
         menu.add(0, MENU_CANCEL, 0,
                 mAddingProfile ? R.string.vpn_menu_cancel
                                : R.string.vpn_menu_revert)
             .setIcon(android.R.drawable.ic_menu_close_clear_cancel);
-        return true;
     }
 
     @Override
     public boolean onOptionsItemSelected(MenuItem item) {
         switch (item.getItemId()) {
             case MENU_SAVE:
-                if (validateAndSetResult()) finish();
+                if (validateAndSetResult()) finishFragment();
                 return true;
 
             case MENU_CANCEL:
                 if (profileChanged()) {
                     showDialog(CONFIRM_DIALOG_ID);
                 } else {
-                    finish();
+                    finishFragment();
                 }
                 return true;
         }
         return super.onOptionsItemSelected(item);
     }
 
+    /*
     @Override
     public boolean onKeyDown(int keyCode, KeyEvent event) {
         switch (keyCode) {
@@ -117,7 +132,7 @@ public class VpnEditor extends PreferenceActivity {
                 return true;
         }
         return super.onKeyDown(keyCode, event);
-    }
+    }*/
 
     private void initViewFor(VpnProfile profile) {
         setTitle(profile);
@@ -125,10 +140,11 @@ public class VpnEditor extends PreferenceActivity {
     }
 
     private void setTitle(VpnProfile profile) {
+        final Activity activity = getActivity();
         String formatString = mAddingProfile
-                ? getString(R.string.vpn_edit_title_add)
+                ? activity.getString(R.string.vpn_edit_title_add)
-                : getString(R.string.vpn_edit_title_edit);
+                : activity.getString(R.string.vpn_edit_title_edit);
-        setTitle(String.format(formatString,
+        activity.setTitle(String.format(formatString,
                 profile.getType().getDisplayName()));
     }
 
@@ -140,7 +156,7 @@ public class VpnEditor extends PreferenceActivity {
         String errorMsg = mProfileEditor.validate();
 
         if (errorMsg != null) {
-            Util.showErrorMessage(this, errorMsg);
+            Util.showErrorMessage(getActivity(), errorMsg);
             return false;
         }
 
@@ -149,9 +165,9 @@ public class VpnEditor extends PreferenceActivity {
     }
 
     private void setResult(VpnProfile p) {
-        Intent intent = new Intent(this, VpnSettings.class);
+        Intent intent = new Intent(getActivity(), VpnSettings.class);
         intent.putExtra(VpnSettings.KEY_VPN_PROFILE, (Parcelable) p);
-        setResult(RESULT_OK, intent);
+        setResult(Activity.RESULT_OK, intent);
     }
 
     private VpnProfileEditor getEditor(VpnProfile p) {
@@ -175,10 +191,9 @@ public class VpnEditor extends PreferenceActivity {
 
 
     @Override
-    protected Dialog onCreateDialog(int id) {
+    public Dialog onCreateDialog(int id) {
-
         if (id == CONFIRM_DIALOG_ID) {
-            return new AlertDialog.Builder(this)
+            return new AlertDialog.Builder(getActivity())
                     .setTitle(android.R.string.dialog_alert_title)
                     .setIcon(android.R.drawable.ic_dialog_alert)
                     .setMessage(mAddingProfile
@@ -187,7 +202,7 @@ public class VpnEditor extends PreferenceActivity {
                     .setPositiveButton(R.string.vpn_yes_button,
                             new DialogInterface.OnClickListener() {
                                 public void onClick(DialogInterface dialog, int w) {
-                                    finish();
+                                    finishFragment();
                                 }
                             })
                     .setNegativeButton(R.string.vpn_mistake_button, null)
@@ -197,8 +212,9 @@ public class VpnEditor extends PreferenceActivity {
         return super.onCreateDialog(id);
     }
 
+    /*
     @Override
-    protected void onPrepareDialog(int id, Dialog dialog) {
+    public void onPrepareDialog(int id, Dialog dialog) {
         super.onPrepareDialog(id, dialog);
 
         if (id == CONFIRM_DIALOG_ID) {
@@ -206,7 +222,7 @@ public class VpnEditor extends PreferenceActivity {
                     ? getString(R.string.vpn_confirm_add_profile_cancellation)
                     : getString(R.string.vpn_confirm_edit_profile_cancellation));
         }
-    }
+    }*/
 
     private VpnProfile getProfile() {
         return mProfileEditor.getProfile();

src/com/android/settings/vpn/VpnSettings.java

@@ -17,11 +17,14 @@
 package com.android.settings.vpn;
 
 import com.android.settings.R;
+import com.android.settings.SettingsPreferenceFragment;
 
+import android.app.Activity;
 import android.app.AlertDialog;
 import android.app.Dialog;
-import android.content.ComponentName;
+import android.app.Fragment;
 import android.content.BroadcastReceiver;
+import android.content.ComponentName;
 import android.content.Context;
 import android.content.DialogInterface;
 import android.content.Intent;
@@ -37,12 +40,10 @@ import android.net.vpn.VpnType;
 import android.os.Bundle;
 import android.os.ConditionVariable;
 import android.os.IBinder;
-import android.os.Parcelable;
 import android.preference.Preference;
-import android.preference.PreferenceActivity;
+import android.preference.Preference.OnPreferenceClickListener;
 import android.preference.PreferenceCategory;
 import android.preference.PreferenceScreen;
-import android.preference.Preference.OnPreferenceClickListener;
 import android.security.Credentials;
 import android.security.KeyStore;
 import android.text.TextUtils;
@@ -69,8 +70,8 @@ import java.util.Map;
 /**
  * The preference activity for configuring VPN settings.
  */
-public class VpnSettings extends PreferenceActivity implements
+public class VpnSettings extends SettingsPreferenceFragment
-        DialogInterface.OnClickListener {
+        implements DialogInterface.OnClickListener {
     // Key to the field exchanged for profile editing.
     static final String KEY_VPN_PROFILE = "vpn_profile";
 
@@ -122,7 +123,7 @@ public class VpnSettings extends PreferenceActivity implements
 
     private KeyStore mKeyStore = KeyStore.getInstance();
 
-    private VpnManager mVpnManager = new VpnManager(this);
+    private VpnManager mVpnManager;
 
     private ConnectivityReceiver mConnectivityReceiver =
             new ConnectivityReceiver();
@@ -137,7 +138,13 @@ public class VpnSettings extends PreferenceActivity implements
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         addPreferencesFromResource(R.xml.vpn_settings);
+    }
 
+    @Override
+    public void onActivityCreated(Bundle savedInstanceState) {
+        super.onActivityCreated(savedInstanceState);
+
+        mVpnManager = new VpnManager(getActivity());
         // restore VpnProfile list and construct VpnPreference map
         mVpnListContainer = (PreferenceCategory) findPreference(PREF_VPN_LIST);
 
@@ -168,22 +175,24 @@ public class VpnSettings extends PreferenceActivity implements
         if ((mUnlockAction != null) && isKeyStoreUnlocked()) {
             Runnable action = mUnlockAction;
             mUnlockAction = null;
-            runOnUiThread(action);
+            getActivity().runOnUiThread(action);
         }
     }
 
     @Override
-    protected void onDestroy() {
+    public void onDestroyView() {
-        super.onDestroy();
         unregisterForContextMenu(getListView());
         mVpnManager.unregisterConnectivityReceiver(mConnectivityReceiver);
         if ((mShowingDialog != null) && mShowingDialog.isShowing()) {
             mShowingDialog.dismiss();
         }
+        // This should be called after the procedure above as ListView inside this Fragment
+        // will be deleted here.
+        super.onDestroyView();
     }
 
     @Override
-    protected Dialog onCreateDialog (int id) {
+    public Dialog onCreateDialog (int id) {
         switch (id) {
             case DIALOG_CONNECT:
                 return createConnectDialog();
@@ -203,13 +212,14 @@ public class VpnSettings extends PreferenceActivity implements
     }
 
     private Dialog createConnectDialog() {
-        return new AlertDialog.Builder(this)
+        final Activity activity = getActivity();
+        return new AlertDialog.Builder(activity)
                 .setView(mConnectingActor.createConnectView())
-                .setTitle(String.format(getString(R.string.vpn_connect_to),
+                .setTitle(String.format(activity.getString(R.string.vpn_connect_to),
                         mActiveProfile.getName()))
-                .setPositiveButton(getString(R.string.vpn_connect_button),
+                .setPositiveButton(activity.getString(R.string.vpn_connect_button),
                         this)
-                .setNegativeButton(getString(android.R.string.cancel),
+                .setNegativeButton(activity.getString(android.R.string.cancel),
                         this)
                 .setOnCancelListener(new DialogInterface.OnCancelListener() {
                             public void onCancel(DialogInterface dialog) {
@@ -291,7 +301,7 @@ public class VpnSettings extends PreferenceActivity implements
     }
 
     private AlertDialog.Builder createCommonDialogBuilder() {
-        return new AlertDialog.Builder(this)
+        return new AlertDialog.Builder(getActivity())
                 .setTitle(android.R.string.dialog_alert_title)
                 .setIcon(android.R.drawable.ic_dialog_alert)
                 .setPositiveButton(R.string.vpn_yes_button,
@@ -364,9 +374,9 @@ public class VpnSettings extends PreferenceActivity implements
     }
 
     @Override
-    protected void onActivityResult(final int requestCode, final int resultCode,
+    public void onActivityResult(final int requestCode, final int resultCode,
             final Intent data) {
-        if ((resultCode == RESULT_CANCELED) || (data == null)) {
+        if ((resultCode == Activity.RESULT_CANCELED) || (data == null)) {
             Log.d(TAG, "no result returned by editor");
             return;
         }
@@ -381,11 +391,12 @@ public class VpnSettings extends PreferenceActivity implements
                 return;
             }
 
+            final Activity activity = getActivity();
             int index = getProfileIndexFromId(p.getId());
             if (checkDuplicateName(p, index)) {
                 final VpnProfile profile = p;
-                Util.showErrorMessage(this, String.format(
+                Util.showErrorMessage(activity, String.format(
-                        getString(R.string.vpn_error_duplicate_name),
+                        activity.getString(R.string.vpn_error_duplicate_name),
                         p.getName()),
                         new DialogInterface.OnClickListener() {
                             public void onClick(DialogInterface dialog, int w) {
@@ -407,30 +418,32 @@ public class VpnSettings extends PreferenceActivity implements
             try {
                 if (index < 0) {
                     addProfile(p);
-                    Util.showShortToastMessage(this, String.format(
+                    Util.showShortToastMessage(activity, String.format(
-                            getString(R.string.vpn_profile_added), p.getName()));
+                            activity.getString(R.string.vpn_profile_added), p.getName()));
                 } else {
                     replaceProfile(index, p);
-                    Util.showShortToastMessage(this, String.format(
+                    Util.showShortToastMessage(activity, String.format(
-                            getString(R.string.vpn_profile_replaced),
+                            activity.getString(R.string.vpn_profile_replaced),
                             p.getName()));
                 }
             } catch (IOException e) {
                 final VpnProfile profile = p;
-                Util.showErrorMessage(this, e + ": " + e.getMessage(),
+                Util.showErrorMessage(activity, e + ": " + e.getMessage(),
                         new DialogInterface.OnClickListener() {
                             public void onClick(DialogInterface dialog, int w) {
                                 startVpnEditor(profile);
                             }
                         });
             }
+
+            // Remove cached VpnEditor as it is needless anymore.
         } else {
             throw new RuntimeException("unknown request code: " + requestCode);
         }
     }
 
     // Called when the buttons on the connect dialog are clicked.
-    //@Override
+    @Override
     public synchronized void onClick(DialogInterface dialog, int which) {
         if (which == CONNECT_BUTTON) {
             Dialog d = (Dialog) dialog;
@@ -440,12 +453,15 @@ public class VpnSettings extends PreferenceActivity implements
                 removeDialog(DIALOG_CONNECT);
                 return;
             } else {
-                dismissDialog(DIALOG_CONNECT);
+                // dismissDialog(DIALOG_CONNECT);
+                removeDialog(DIALOG_CONNECT);
+
+                final Activity activity = getActivity();
                 // show error dialog
-                mShowingDialog = new AlertDialog.Builder(this)
+                mShowingDialog = new AlertDialog.Builder(activity)
                         .setTitle(android.R.string.dialog_alert_title)
                         .setIcon(android.R.drawable.ic_dialog_alert)
-                        .setMessage(String.format(getString(
+                        .setMessage(String.format(activity.getString(
                                 R.string.vpn_error_miss_entering), error))
                         .setPositiveButton(R.string.vpn_back_button,
                                 new DialogInterface.OnClickListener() {
@@ -513,7 +529,7 @@ public class VpnSettings extends PreferenceActivity implements
                         }
                     }
                 };
-        mShowingDialog = new AlertDialog.Builder(this)
+        mShowingDialog = new AlertDialog.Builder(getActivity())
                 .setTitle(android.R.string.dialog_alert_title)
                 .setIcon(android.R.drawable.ic_dialog_alert)
                 .setMessage(R.string.vpn_confirm_profile_deletion)
@@ -559,7 +575,7 @@ public class VpnSettings extends PreferenceActivity implements
     // Adds a preference in mVpnListContainer
     private VpnPreference addPreferenceFor(
             VpnProfile p, boolean addToContainer) {
-        VpnPreference pref = new VpnPreference(this, p);
+        VpnPreference pref = new VpnPreference(getActivity(), p);
         mVpnPreferenceMap.put(p.getName(), pref);
         if (addToContainer) mVpnListContainer.addPreference(pref);
 
@@ -599,8 +615,8 @@ public class VpnSettings extends PreferenceActivity implements
     }
 
     private void startVpnTypeSelection() {
-        Intent intent = new Intent(this, VpnTypeSelection.class);
+        startFragment(this, VpnTypeSelection.class.getCanonicalName(),
-        startActivityForResult(intent, REQUEST_SELECT_VPN_TYPE);
+                REQUEST_SELECT_VPN_TYPE, null);
     }
 
     private boolean isKeyStoreUnlocked() {
@@ -614,16 +630,14 @@ public class VpnSettings extends PreferenceActivity implements
                 L2tpIpsecPskProfile pskProfile = (L2tpIpsecPskProfile) p;
                 String presharedKey = pskProfile.getPresharedKey();
                 if (!TextUtils.isEmpty(presharedKey)) return true;
-                // pass through
+                // $FALL-THROUGH$
-
             case L2TP:
                 L2tpProfile l2tpProfile = (L2tpProfile) p;
                 if (l2tpProfile.isSecretEnabled() &&
                         !TextUtils.isEmpty(l2tpProfile.getSecretString())) {
                     return true;
                 }
-                // pass through
+                // $FALL-THROUGH$
-
             default:
                 return false;
         }
@@ -648,14 +662,15 @@ public class VpnSettings extends PreferenceActivity implements
     private boolean unlockKeyStore(VpnProfile p, Runnable action) {
         if (isKeyStoreUnlocked()) return true;
         mUnlockAction = action;
-        Credentials.getInstance().unlock(this);
+        Credentials.getInstance().unlock(getActivity());
         return false;
     }
 
     private void startVpnEditor(final VpnProfile profile) {
-        Intent intent = new Intent(this, VpnEditor.class);
+        Bundle args = new Bundle();
-        intent.putExtra(KEY_VPN_PROFILE, (Parcelable) profile);
+        args.putParcelable(KEY_VPN_PROFILE, profile);
-        startActivityForResult(intent, REQUEST_ADD_OR_EDIT_PROFILE);
+        startFragment(this, VpnEditor.class.getCanonicalName(),
+                REQUEST_ADD_OR_EDIT_PROFILE, args);
     }
 
     private synchronized void connect(final VpnProfile p) {
@@ -714,7 +729,7 @@ public class VpnSettings extends PreferenceActivity implements
 
         case CONNECTING:
             mConnectingActor = getActor(p);
-            // pass through
+            // $FALL-THROUGH$
         case DISCONNECTING:
             mActiveProfile = p;
             disableProfilePreferencesIfOneActive();
@@ -810,11 +825,6 @@ public class VpnSettings extends PreferenceActivity implements
             public int compare(VpnProfile p1, VpnProfile p2) {
                 return p1.getName().compareTo(p2.getName());
             }
-
-            public boolean equals(VpnProfile p) {
-                // not used
-                return false;
-            }
         });
         for (VpnProfile p : mVpnProfileList) {
             Preference pref = addPreferenceFor(p, false);
@@ -855,20 +865,21 @@ public class VpnSettings extends PreferenceActivity implements
     }
 
     private String getProfileSummaryString(VpnProfile p) {
+        final Activity activity = getActivity();
         switch (p.getState()) {
         case CONNECTING:
-            return getString(R.string.vpn_connecting);
+            return activity.getString(R.string.vpn_connecting);
         case DISCONNECTING:
-            return getString(R.string.vpn_disconnecting);
+            return activity.getString(R.string.vpn_disconnecting);
         case CONNECTED:
-            return getString(R.string.vpn_connected);
+            return activity.getString(R.string.vpn_connected);
         default:
-            return getString(R.string.vpn_connect_hint);
+            return activity.getString(R.string.vpn_connect_hint);
         }
     }
 
     private VpnProfileActor getActor(VpnProfile p) {
-        return new AuthenticationActor(this, p);
+        return new AuthenticationActor(getActivity(), p);
     }
 
     private VpnProfile createVpnProfile(String type) {
@@ -938,8 +949,7 @@ public class VpnSettings extends PreferenceActivity implements
                     Log.e(TAG, "keystore write failed: key=" + key);
                 }
                 pskProfile.setPresharedKey(key);
-                // pass through
+                // $FALL-THROUGH$
-
             case L2TP_IPSEC:
             case L2TP:
                 L2tpProfile l2tpProfile = (L2tpProfile) p;
@@ -1007,8 +1017,6 @@ public class VpnSettings extends PreferenceActivity implements
 
     // managing status check in a background thread
     private class StatusChecker {
-        private List<VpnProfile> mList;
-
         synchronized void check(final List<VpnProfile> list) {
             final ConditionVariable cv = new ConditionVariable();
             cv.close();
@@ -1027,7 +1035,7 @@ public class VpnSettings extends PreferenceActivity implements
                             changeState(p, VpnState.IDLE);
                         }
                     }
-                    VpnSettings.this.unbindService(this);
+                    getActivity().unbindService(this);
                     showPreferences();
                 }
 
@@ -1035,7 +1043,7 @@ public class VpnSettings extends PreferenceActivity implements
                     cv.open();
 
                     setDefaultState(list);
-                    VpnSettings.this.unbindService(this);
+                    getActivity().unbindService(this);
                     showPreferences();
                 }
             };

src/com/android/settings/vpn/VpnTypeSelection.java

@@ -17,13 +17,14 @@
 package com.android.settings.vpn;
 
 import com.android.settings.R;
+import com.android.settings.SettingsPreferenceFragment;
 
+import android.app.Activity;
 import android.content.Intent;
 import android.net.vpn.VpnManager;
 import android.net.vpn.VpnType;
 import android.os.Bundle;
 import android.preference.Preference;
-import android.preference.PreferenceActivity;
 import android.preference.PreferenceScreen;
 
 import java.util.HashMap;
@@ -32,7 +33,7 @@ import java.util.Map;
 /**
  * The activity to select a VPN type.
  */
-public class VpnTypeSelection extends PreferenceActivity {
+public class VpnTypeSelection extends SettingsPreferenceFragment {
     private Map<String, VpnType> mTypeMap = new HashMap<String, VpnType>();
 
     @Override
@@ -46,19 +47,20 @@ public class VpnTypeSelection extends PreferenceActivity {
     @Override
     public boolean onPreferenceTreeClick(PreferenceScreen ps, Preference pref) {
         setResult(mTypeMap.get(pref.getTitle().toString()));
-        finish();
+        finishFragment();
         return true;
     }
 
     private void initTypeList() {
         PreferenceScreen root = getPreferenceScreen();
+        final Activity activity = getActivity();
         for (VpnType t : VpnManager.getSupportedVpnTypes()) {
             String displayName = t.getDisplayName();
             String message = String.format(
-                    getString(R.string.vpn_edit_title_add), displayName);
+                    activity.getString(R.string.vpn_edit_title_add), displayName);
             mTypeMap.put(message, t);
 
-            Preference pref = new Preference(this);
+            Preference pref = new Preference(activity);
             pref.setTitle(message);
             pref.setSummary(t.getDescriptionId());
             root.addPreference(pref);
@@ -66,8 +68,8 @@ public class VpnTypeSelection extends PreferenceActivity {
     }
 
     private void setResult(VpnType type) {
-        Intent intent = new Intent(this, VpnSettings.class);
+        Intent intent = new Intent(getActivity(), VpnSettings.class);
         intent.putExtra(VpnSettings.KEY_VPN_TYPE, type.toString());
-        setResult(RESULT_OK, intent);
+        setResult(Activity.RESULT_OK, intent);
     }
 }