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      1 /*
      2  * Copyright (C) 2009 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.contacts.common.preference;
     18 
     19 import android.content.Context;
     20 import android.os.Bundle;
     21 import android.app.ActionBar;
     22 import android.preference.PreferenceActivity;
     23 import android.view.MenuItem;
     24 
     25 import com.android.contacts.common.R;
     26 
     27 /**
     28  * Contacts settings.
     29  */
     30 public final class ContactsPreferenceActivity extends PreferenceActivity {
     31 
     32     private static final String TAG_ABOUT_CONTACTS = "about_contacts";
     33 
     34     @Override
     35     protected void onCreate(Bundle savedInstanceState) {
     36         super.onCreate(savedInstanceState);
     37 
     38         final ActionBar actionBar = getActionBar();
     39         if (actionBar != null) {
     40             actionBar.setDisplayOptions(ActionBar.DISPLAY_HOME_AS_UP, ActionBar.DISPLAY_HOME_AS_UP);
     41         }
     42 
     43         if (savedInstanceState == null) {
     44             getFragmentManager().beginTransaction()
     45                     .replace(android.R.id.content, new DisplayOptionsPreferenceFragment())
     46                     .commit();
     47             setActivityTitle(R.string.activity_title_settings);
     48         } else {
     49             final AboutPreferenceFragment fragment = (AboutPreferenceFragment) getFragmentManager()
     50                     .findFragmentByTag(TAG_ABOUT_CONTACTS);
     51             setActivityTitle(fragment == null ?
     52                     R.string.activity_title_settings : R.string.setting_about);
     53         }
     54     }
     55 
     56     public void showAboutFragment() {
     57         getFragmentManager().beginTransaction()
     58                 .replace(android.R.id.content, new AboutPreferenceFragment(), TAG_ABOUT_CONTACTS)
     59                 .addToBackStack(null)
     60                 .commit();
     61         setActivityTitle(R.string.setting_about);
     62     }
     63 
     64     /**
     65      * Returns true if there are no preferences to display and therefore the
     66      * corresponding menu item can be removed.
     67      */
     68     public static boolean isEmpty(Context context) {
     69         return !context.getResources().getBoolean(R.bool.config_sort_order_user_changeable)
     70                 && !context.getResources().getBoolean(R.bool.config_display_order_user_changeable)
     71                 && !context.getResources().getBoolean(
     72                         R.bool.config_default_account_user_changeable);
     73     }
     74 
     75     @Override
     76     public boolean onOptionsItemSelected(MenuItem item) {
     77         if (item.getItemId() == android.R.id.home) {
     78             onBackPressed();
     79             return true;
     80         }
     81         return false;
     82     }
     83 
     84     @Override
     85     public void onBackPressed() {
     86         if (getFragmentManager().getBackStackEntryCount() > 0) {
     87             setActivityTitle(R.string.activity_title_settings);
     88             getFragmentManager().popBackStack();
     89         } else {
     90             super.onBackPressed();
     91         }
     92     }
     93 
     94     private void setActivityTitle(int res) {
     95         final ActionBar actionBar = getActionBar();
     96         if (actionBar != null) {
     97             actionBar.setTitle(res);
     98         }
     99     }
    100 }
    101