Merge "Back out of Home settings when penultimate home app is uninstalled" into klp-dev

res/values/strings.xml

@@ -4768,6 +4768,8 @@
 
     <!-- Home application selection - uninstall button [CHAR LIMIT=80] -->
     <string name="home_app_uninstall_button">Uninstall this application</string>
+    <!-- Message to user that Home Settings will be hidden because there is now only one available home application -->
+    <string name="only_one_home_message">Home settings will be hidden until you install another home application.</string>
 
     <!-- Warning message when changing a global setting for a tablet.[CHAR LIMIT=none] -->
     <string name="global_change_warning" product="tablet">This setting affects all users on this tablet.</string>

src/com/android/settings/HomeSettings.java

@@ -23,6 +23,7 @@ import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
+import android.content.SharedPreferences;
 import android.content.pm.ActivityInfo;
 import android.content.pm.ApplicationInfo;
 import android.content.pm.PackageInfo;
@@ -50,6 +51,8 @@ public class HomeSettings extends SettingsPreferenceFragment {
 
     public static final String CURRENT_HOME = "current_home";
 
+    public static final String HOME_SHOW_NOTICE = "show";
+
     PreferenceGroup mPrefGroup;
 
     PackageManager mPm;
@@ -57,6 +60,7 @@ public class HomeSettings extends SettingsPreferenceFragment {
     ArrayList<HomeAppPreference> mPrefs;
     HomeAppPreference mCurrentHome = null;
     final IntentFilter mHomeFilter;
+    boolean mShowNotice;
 
     public HomeSettings() {
         mHomeFilter = new IntentFilter(Intent.ACTION_MAIN);
@@ -126,6 +130,17 @@ public class HomeSettings extends SettingsPreferenceFragment {
                 }
             }
         }
+
+        // If we're down to just one possible home app, back out of this settings
+        // fragment and show a dialog explaining to the user that they won't see
+        // 'Home' settings now until such time as there are multiple available.
+        if (mPrefs.size() < 2) {
+            if (mShowNotice) {
+                mShowNotice = false;
+                Settings.requestHomeNotice();
+            }
+            finishFragment();
+        }
     }
 
     void buildHomeActivitiesList() {
@@ -176,6 +191,9 @@ public class HomeSettings extends SettingsPreferenceFragment {
 
         mPm = getPackageManager();
         mPrefGroup = (PreferenceGroup) findPreference("home");
+
+        Bundle args = getArguments();
+        mShowNotice = (args != null) && args.getBoolean(HOME_SHOW_NOTICE, false);
     }
 
     @Override

src/com/android/settings/Settings.java

@@ -19,6 +19,10 @@ package com.android.settings;
 import android.accounts.Account;
 import android.accounts.AccountManager;
 import android.accounts.OnAccountsUpdateListener;
+import android.app.Activity;
+import android.app.AlertDialog;
+import android.app.Dialog;
+import android.app.DialogFragment;
 import android.app.admin.DevicePolicyManager;
 import android.content.BroadcastReceiver;
 import android.content.ComponentName;
@@ -27,7 +31,6 @@ import android.content.Intent;
 import android.content.IntentFilter;
 import android.content.SharedPreferences;
 import android.content.pm.ActivityInfo;
-import android.content.pm.ApplicationInfo;
 import android.content.pm.PackageManager;
 import android.content.pm.PackageManager.NameNotFoundException;
 import android.content.pm.ResolveInfo;
@@ -117,6 +120,10 @@ public class Settings extends PreferenceActivity
     private static final String SAVE_KEY_CURRENT_HEADER = "com.android.settings.CURRENT_HEADER";
     private static final String SAVE_KEY_PARENT_HEADER = "com.android.settings.PARENT_HEADER";
 
+    static final int DIALOG_ONLY_ONE_HOME = 1;
+
+    private static boolean sShowNoHomeNotice = false;
+
     private String mFragmentClass;
     private int mTopLevelHeaderId;
     private Header mFirstHeader;
@@ -684,8 +691,22 @@ public class Settings extends PreferenceActivity
             getPackageManager().getHomeActivities(homeApps);
             if (homeApps.size() < 2) {
                 // When there's only one available home app, omit this settings
-                // category entirely at the top level UI.
+                // category entirely at the top level UI.  If the user just
+                // uninstalled the penultimate home app candidiate, we also
+                // now tell them about why they aren't seeing 'Home' in the list.
+                if (sShowNoHomeNotice) {
+                    sShowNoHomeNotice = false;
+                    NoHomeDialogFragment.show(this);
+                }
                 return false;
+            } else {
+                // Okay, we're allowing the Home settings category.  Tell it, when
+                // invoked via this front door, that we'll need to be told about the
+                // case when the user uninstalls all but one home app.
+                if (header.fragmentArguments == null) {
+                    header.fragmentArguments = new Bundle();
+                }
+                header.fragmentArguments.putBoolean(HomeSettings.HOME_SHOW_NOTICE, true);
             }
         } catch (Exception e) {
             // Can't look up the home activity; bail on configuring the icon
@@ -727,6 +748,21 @@ public class Settings extends PreferenceActivity
         return super.getNextButton();
     }
 
+    public static class NoHomeDialogFragment extends DialogFragment {
+        public static void show(Activity parent) {
+            final NoHomeDialogFragment dialog = new NoHomeDialogFragment();
+            dialog.show(parent.getFragmentManager(), null);
+        }
+
+        @Override
+        public Dialog onCreateDialog(Bundle savedInstanceState) {
+            return new AlertDialog.Builder(getActivity())
+                    .setMessage(R.string.only_one_home_message)
+                    .setPositiveButton(android.R.string.ok, null)
+                    .create();
+        }
+    }
+
     private static class HeaderAdapter extends ArrayAdapter<Header> {
         static final int HEADER_TYPE_CATEGORY = 0;
         static final int HEADER_TYPE_NORMAL = 1;
@@ -918,11 +954,6 @@ public class Settings extends PreferenceActivity
                             ManageAccountsSettings.KEY_ACCOUNT_TYPE);
                     Drawable icon = mAuthHelper.getDrawableForType(getContext(), accType);
                     setHeaderIcon(holder, icon);
-                } else if (header.extras != null &&
-                        header.extras.containsKey(HomeSettings.CURRENT_HOME)) {
-                    ActivityInfo ai = header.extras.getParcelable(HomeSettings.CURRENT_HOME);
-                    Drawable icon = ai.loadIcon(getContext().getPackageManager());
-                    setHeaderIcon(holder, icon);
                 } else {
                     holder.icon.setImageResource(header.iconRes);
                 }
@@ -1015,6 +1046,10 @@ public class Settings extends PreferenceActivity
         invalidateHeaders();
     }
 
+    public static void requestHomeNotice() {
+        sShowNoHomeNotice = true;
+    }
+
     /*
      * Settings subclasses for launching independently.
      */